TeamCapri

Tech, Repairs, Upgrades => Engine & Drivetrain Swaps => Topic started by: WashiestSnake on July 14, 2016, 02:18:30 AM

Title: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 14, 2016, 02:18:30 AM
Can someone give me an idea about how much torque a G-Series tranny, and the AWD GTX tranny can take?

I'm new to this whole drive train swap/engine stuff. Is it possible to put stronger gears in these transmission? Sorry If i'm asking stupid questions  :-\ .

I'm trying to get a good idea at what i want to use in my build, so any help/info is awesome!
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: azgtx on July 14, 2016, 03:03:42 PM
Depends what you are going to do with the car. The BF awd g series is not noted for strength but it is all in how you use it. Personally I have never broke one but I don't abuse them. Clutch drops and banging gears will not do for very long. The BG awd tranny is said to be tougher and it has a viscous coupler in the center diff but it mounts differently. There are reported cryo treated gears made in Australia by Albins I think...extremely expensive. Xtrac dog boxes were used when these cars were in rally use. Again very rare and expensive and I know of only 2 units left that have been reported. If you are using a b6t you are not going to make big power unless you plan to spend large money so I wouldn't worry to much about the tranny unless you are going to beat on it...just make sure you get a good one as they are getting hard to find as well as a rebuilder that is familiar with them.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 14, 2016, 04:09:55 PM
Well the thing is im going to be using the BP motor with a Flyin' Miata 2.0 stroker kit, and if i can get it to work a Jackson racing supercharger. If thats not possible ill be using a  Garret GT2560, so i'd be making around 285hp out of the stroker motor. So in your opinion would it be better to just upgrade my N/A Capri to a FWD G-series, or the AWD G-series? I realize the AWD swap would be pretty hard. Im also planning on running a Megasquirt 3, I see no reason to swap to a Rocketchip/XR-2 ecu, when i could use a standalone.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: azgtx on July 14, 2016, 08:14:26 PM
If you using the BP then use the G series for the 1.8L. The 1.8 is tilted 11* to the front and the trannies are set up for that. FWD or AWD.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 14, 2016, 08:43:02 PM
Thanks azgtx your a great help  ;D !
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 15, 2016, 08:17:41 AM
Are you stroking the BP just to be different?

A straight turbo BP is really a lot of power for this chassis. Can't imagine what it would be with a stroker.

Here's the answer to your transmission issues: http://www.clubprotege.com/forum/showthread.php?65289-E153-x-BP-Transmission-Adapter-Plates-In-Stock!

It will probably be a chore to fit that trans in a Capri but well worth it in the long run
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: azgtx on July 15, 2016, 01:23:43 PM
That is for sure Matt...it is a bitch even on a BG chassis.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 15, 2016, 03:21:29 PM
Are you stroking the BP just to be different?

A straight turbo BP is really a lot of power for this chassis. Can't imagine what it would be with a stroker.

Here's the answer to your transmission issues: http://www.clubprotege.com/forum/showthread.php?65289-E153-x-BP-Transmission-Adapter-Plates-In-Stock!

It will probably be a chore to fit that trans in a Capri but well worth it in the long run
No the reason I want the stroker is only for the the quicker spool. I just dont want to spend all the time to tear apart my car just to blow up the AWD transmission. Thats why im trying to get help from you guys before I start laying down the money to get what ill need.

The goal of my car is to be a Fiesta/British Capri RS re-envision on this generation of Capri. My whole plan is to make something that looks like Ford Australia could of offered, had the Capri have been given the correct components. My problem is im new to working on cars so im going to have to lean on you guys alot during this. I know alot of it seems far fetched, but this is something i've been planing since I bought my Capri. I also plan on stiffening the chassis up with fender braces(BG with mods), and GTX floor pan braces.

Also huge thanks Matt, I thought those adapter plates wouldn't be made again! Am i correct in thinking that adapter plate is for the Toyota Altrac AWD tranny?

-Mike
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 15, 2016, 07:15:17 PM
Another thing to note is I don't plan on going straight into a Stroker. My plan is to make a forged BP, and if I think its really needed ill pick up another block and build that. I do want the Supercharger to be different, and to get more torque down low. I'm not a big fan of waiting till 3k to get boost.

Another question I have is what if I decided to use a later model BP ie 99+, considering they are higher compression if I built it correctly should it be able to run boosts of 12psi and higher? I understand high compression results in more horsepower, but at what point is it dangerous?
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 17, 2016, 01:08:32 AM
I updated my posts, could you guys answer my questions?
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 17, 2016, 02:11:21 PM
the BP4W is a very different beast
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: chrispoe on July 17, 2016, 08:00:55 PM
I wouldn’t bother with the BP4W from the 99+ miata’s.  That engine is setup for RWD, had a short production run so there is limited aftermarket support for it, and most of the tweaks to that engine are mainly beneficial only if you run it N/A.
If you going to do a forged BP build, I wouldn’t bother with the stroker kit. A set of aftermarket 1mm oversized pistons will  already get you close to 1.9L and then you can choose whatever compression ratio you want too.


The main problems with the G series trannys is the differential. The pin breaks, comes out the side of the differential, and then takes out the tranny case or the spider gears inside of it strip. The OEM differentials don’t like excessive burn-outs, wheel hop, clutch dumping, or other sudden torque shocks. For the differential you can buy a Mfactory lsd for about $750.


The second issue is the tranny casing itself. When under high power levels(250+FTLb of torque), the case flexs and the gears misalign leading to reduced contact area and stripped gears. Generally 3rd is the most prone to stripping followed by 4th.

As for the case flex/stripping gears, I’ve seen various workarounds. PAR Engeneering makes straight cut gears that eliminate the the secondary shafts side loading the tranny case. A lot of Probe owners just upgrade the third gear and install a lsd, and are doing 300+whp just fine.  I know PAR now offers a bearing cup that can be machined/installed into the tranny case too. 
There was also a group buy not too long ago on the Probe forums for Mfactory gears. They were offering 500hp semi- helical 3rd and 4th gears as a package deal for $750 or a short ratio set with 3rd, 4th, and 5th for $1000

I’ve even seen somebody that replaced the fifth gear with a bushing and bolted a steel support plate on the end of the tranny in it’s place and ran a KLDE with 20psi of boost. So there are options.


IMHO…I think the E153 is a awesome tranny upgrade for the BG chassis , but I think it would be more expensive and a bigger hassle than what it’s worth trying to get it to fit in a BF chassis.  The BG guys are lucky that the Toyota axles and outer CV can be made to work with their 26 spline hubs.  I’ve already researched for alternatives for our 24 spline hubs and found nothing, Mazda uses INT type splines for the mid shafts and Toyota uses NO splines, so there’re no hybriding options available for us.
Also going by what Therealdeal posted with his E153 conversion, the larger tranny moved the engine an inch higher and forward too. In order get that to fit our low slopping hood line, a fabricated crossmember will be required to lower the drivetrain and you’ll probably have other clearance issues beyond that too.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 17, 2016, 08:13:54 PM
Thanks guys, you're a great help! The reason I was asking about the BP4W was from what I heard is that its the strongest block out of all of the BPs made. One question I have is why are we stuck with a Distributor on these engine? Whats the reason we cant go to C.O.P, other then wiring?

List of Parts I need for the Swap: (Correct Me If Wrong)
BPT Transmission
GTX Driveshaft/Halfshafts(Will XR-2 half-shafts work?)
Hydraulic Pedals(Shouldn't my N/A pedals work?)
Clutch Master Cylinder
Fuel Cell/GTX Fuel Tank?
BF GTX Rear Subframe, with Diff
BG GTX Shifter Cables
XR-2 Engine Harness

Considering im taking out my convertible top/frame could I use a GTX fuel tank? Am I correct in thinking on a GTX the fuel tank is where the convertible top is?


Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 17, 2016, 11:18:09 PM
You need axles and half-shaft for a 4wd protege, and you need to hybrid them with BF GTX axles in order to make the BPT trans work.
XR2 axles and half-shaft do not work

The stock hydraulic clutch pedal & master should work just fine, you'll need to make a line to connect to the slave.

I have not fitted the GTX fuel tank (cannot find one, super hard to get) but it should fit in place of the stock fuel tank. Not totally positive on that. You will need both fuel pumps/sending units and the balance computer to go with it. There should be absolutely no interference with the ragtop. I would like to delete my fuel cell and go with an under-car tank, and I will probably have to custom fab it

In order to go COP you will have to change the engine management system to something totally different like Megasquirt. I think the guys who re-worked the EVO 8 ECU for BP use have enabled the use of COP

The block is not a weak point on any of the B series engines
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 17, 2016, 11:48:55 PM
Thanks Matt, thats all the questions I have so far!   ;D

Now I get to wait 4 months to find all of this, the worst part is a saw a BPT with AWD tranny on Ebay 2 months ago. Too bad I didn't have the money for it.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: chrispoe on July 18, 2016, 09:34:09 AM
Thanks Matt, thats all the questions I have so far!   ;D

Now I get to wait 4 months to find all of this, the worst part is a saw a BPT with AWD tranny on Ebay 2 months ago. Too bad I didn't have the money for it.

It’s no big deal, there’s a bunch of BPTs with the AWD trannys still attached all over ebay.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 22, 2016, 11:05:14 PM
Quick question would the LSD upgrade work on the AWD tranny? Am I correct in thinking that the front diff is Open, but the back is a viscous LSD, or was that changed when they switch transmissions?

Also @Matt how does the GTXR2 handle, does it have any torque steer/strange characteristics?
The plan for my car is the best handling Capri, I really wanna try to get the car down to 50/50 weight if possible. I'm guessing the GTXR2 is probably around 2800lbs with atleast a 60/40 weight distribution.

To clarify I don't plan on abusing my car, I daily it so a dead transmission is not a option at all. My goal is to be able to beat a 2011 Mustang V6(305hp) 3850lbs, but I also want a car that is streetable and remains reliable(I realize that means big money). I may do a small amount of rallying/autocross, but I don't plan that to be something that would be the main focus for my car.

Also before one of you ask, no I have no plans on switching to a different car. I love how the Capri is more of a GT car then a full blown Sports Car.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 23, 2016, 11:23:59 AM
The LSD does not work in the AWD tranny. The front diffs are much different.

The diffs on the BF GTX were all open. The center diff could be locked for slick weather but NOT to be used on dry pavement. (the torque split is done by different front / rear gear ratios, and this binds the center diff and will destroy it)

I think the BG center diff is viscous? I don't remember.

You can use the Miata LSD's in the rear but none were a stock option


My GTXR2 weighed in at 2900lbs after the conversion, I don't know the split.
It handled pretty much exactly like a slightly heavier stock capri. Only once did I get the rear to scoot out behind me. The one time I took it out in the snow it was all grip and then understeer.

You'll beat the mustang off the line but with the short gear ratios and lots of drivetrain loss he will overtake you once hes up to speed. my AWD fell flat on its face at 90mph. It's geared even lower than a stock XR2 so its pretty buzzy. Huge complaint of mine
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 23, 2016, 11:37:39 AM
Alright that's good to know, I thought it was gonna be something like that. I guess ill have to go over to ClubProtege and try and see if they have any solutions for a front LSD.

What would happen at 90mph would it just cap out? From what i've heard the top speed of the GTX should be around 140, maybe you just got a bad tranny? How much horsepower does the transmission suck up, isn't it something crazy like 25%?

With the Miata LSD is a drop in into the rear GTX sub or will I have to do a large amount of modification?

Also thanks Matt you're a great help, you really are a role model to me when it comes to these cars! :-D
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 23, 2016, 03:17:33 PM
There are no LSD solutions for the GTX transmission, period. There are options for the Toyota transmissions.

Yes, there is significant and noticeable drivetrain loss at higher speeds. I've read it's 25-30%.

It's not a "cap" at 90. It stops accelerating very hard there. It will still go, it just takes time, and is very unlike the stock XR2.
Between the aerodynamic drag, and all the extra drive train, there's suddenly a lot less power to keep it accelerating hard. And it's not exactly short on power either

The Miata LSD will fit into the GTX rearend, it's best to have a transmission shop or someone do it who knows how to adjust pinion gears. You need the LSD axle stubs to go with it. It's a viscous unit, so it's not really going to do much. Do some reading on them. There are others that are clutch or helical type that will fit too
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: azgtx on July 23, 2016, 07:53:00 PM
Yes the Miata (91-93) vlsd will fit into the BF GTX rear diff. I just had one rebuilt. The vlsd will work fine for a street car or even a track car. The hotter they get the better they work and they are maintenance free other than changing oil. You can also "try" to find a Mazdaspeed lsd. These are a plate type diff and will need servicing eventually. They came in 1.5( lock on accel ) or a 2.0 ( lock on acel and decel) which I also have one of those and they really wake the car up in and out of the corners. Trolling on yahoo japan might come up with something but they are sheer unobtainium anymore. If you want a 91-93 Miata vlsd with the stub axles I have one for sale. Skip the thought of an lsd in the BF GTX awd tranny. You might as well use the BG GTX or GTR awd tranny which does have a viscous front lsd unit.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 24, 2016, 12:06:08 AM
Yes the Miata (91-93) vlsd will fit into the BF GTX rear diff. I just had one rebuilt. The vlsd will work fine for a street car or even a track car. The hotter they get the better they work and they are maintenance free other than changing oil. You can also "try" to find a Mazdaspeed lsd. These are a plate type diff and will need servicing eventually. They came in 1.5( lock on accel ) or a 2.0 ( lock on acel and decel) which I also have one of those and they really wake the car up in and out of the corners. Trolling on yahoo japan might come up with something but they are sheer unobtainium anymore. If you want a 91-93 Miata vlsd with the stub axles I have one for sale. Skip the thought of an lsd in the BF GTX awd tranny. You might as well use the BG GTX or GTR awd tranny which does have a viscous front lsd unit.
The plan is to use the BPT AWD transmission, mostly because its stronger and its just plain easier to get. Im currently saving up money for the engine, and transmission If i'm lucky in a few months ill be able to pick it up. After that if you still have it I'd definitely be interested in the LSD. Why is the tranny considered "glassy" if it was able to handle 240hp stock from a GTR?

 Im really worried about finding the axels, and subframe/diff, I cant find anything on ebay or any of the GTX Facebook pages.

 im seriously worried about finding a tuning shop that has a Dyno for AWD cars, thats gonna make getting a tune a pain. @Matt Why did you remove the Megasquirt from the GTXR2?

EDIT:Found BF GTX Axels
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 25, 2016, 07:15:12 PM
Just found some new info on CLubProtege, Apprerntly the RAV4 AWD tranny e-series should fit, but that was only talking about with the B6T. So what are your guys thoughts?
Link: http://www.clubprotege.com/forum/showthread.php?62876-Celica-GT4-trans-in-a-BF/page2
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 25, 2016, 10:37:50 PM
Why is the tranny considered "glassy" if it was able to handle 240hp stock from a GTR?

Because the GTR transmission is not a GTX transmission. Any of these will blow up if launched and abused.
The GTR tranny had better treatments on the gears in it if I recall right

I took the Megasquirt out because the Rocketchip was running my BP just fine at the conservative boost levels I was running to save stress on the transmission. I was running 12psi on the tbird which made for a ridiculously quick Capri
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 25, 2016, 10:54:07 PM
When searching on ebay is there anyway to tell externally which varient of the AWD Tranny it is? Like is there any external differences between the GTX, and the GTR trans?

Do you think the Rav4 trans would work if I took and upgraded the Capri to BG front suspension to make it so that the axels would work?
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on July 28, 2016, 11:18:13 PM
BG suspension is not an easy fit to the Capri. The suspension geometries are very different. I know its been done. AWD BG rear too?

GTR engine/tranny is going to be way more expensive and sold as such. Whatever you see is likely GTX

It's possible to have custom axles machined to use Rav4 inner CV cups and stock Capri outer cups. This would solve a lot of issues except for the one with the wallet lol
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: chrispoe on July 31, 2016, 02:49:50 AM
My GTXR2 weighed in at 2900lbs after the conversion, I don't know the split.
It handled pretty much exactly like a slightly heavier stock capri. Only once did I get the rear to scoot out behind me. The one time I took it out in the snow it was all grip and then understeer.

You'll beat the mustang off the line but with the short gear ratios and lots of drivetrain loss he will overtake you once hes up to speed. my AWD fell flat on its face at 90mph. It's geared even lower than a stock XR2 so its pretty buzzy. Huge complaint of mine
Ouch….2900LBS, and I was worried about breaking 2400LBS with a KL swap…LOL

The BF GTX has the same gear ratios as the XR2 except the final drive ratio is 4.1 instead of 3.85. That’s only a 6-7% increase in RPMs and that doesn’t seem too bad to me.

Why is the tranny considered "glassy" if it was able to handle 240hp stock from a GTR?
 
My spec sheets say the GTX came with 161hp and the GTR came with 182hp. I do believe Rocketman is right about the GTR tranny gears being shot-peened, but it really didn’t help much do to the issue of the tranny’s case flexing.

BG suspension is not an easy fit to the Capri. The suspension geometries are very different. I know its been done.
I did a write-up last year comparing the BF(Capri)to the BG (Escort GT)knuckles.
http://teamcapri.com/forum/index.php/topic,3389.0.html   

I upgraded to BG knuckles on the front of my Capri last year and the swap wasn’t too hard.
I reused my stock struts and slotted the strut’s upper knuckle mounting holes 5mm higher and 2mm over, then welded a washer on each side of the strut’s flange to reinforce the new bolt hole location. Then I used the larger/taller Escort GT outer tie-rod end to correct for the BG's lower steering arm and the longer inner tie-rods from a late 80’s Chevy/Geo Spectrum w/ manual rack.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on July 31, 2016, 06:13:34 AM
You guys are awesome!! So Chris are you running the power steering still or did you convert your Capri to just manual? Also are you going to do a swap guide for the 1.8?  Because to be honest im not scared of swapping in the AWD since I have Matt's pictures. The 1.8l swap makes me nervous because i'm not sure how to do it..

Also I wouldn't consider 2900lbs all that bad when you have 225hp.

But yea thats all the questions I have, I plan on leaving this thread dead till I get the components I need.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: chrispoe on August 08, 2016, 10:30:17 AM
You guys are awesome!! So Chris are you running the power steering still or did you convert your Capri to just manual? Also are you going to do a swap guide for the 1.8?  Because to be honest im not scared of swapping in the AWD since I have Matt's pictures. The 1.8l swap makes me nervous because i'm not sure how to do it..
I seized the power steering pump in my car like 6 years ago while the RPMs were 7500+ and never bothered to fix it. I just connected the lines together and bypassed the pump.  The only reason I would bother fixing it was if I upgraded to the quicker rack from a MX6/Probe.

Swapping the BP will be easier then converting the car to AWD. I haven’t worked on the guide for a while now, but I’m about half way done though. Unfortunately there aren’t many good pics to go with it due to the fact that when I did my swap, decent digital cameras were really expensive.


Also I wouldn't consider 2900lbs all that bad when you have 225hp.
That’s just for acceleration, what about braking and cornering?

Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on August 08, 2016, 06:10:20 PM
Im going to upgrade to the big brake kit, If that isnt good enough I guess ill have to try and find some better then stock escort rotors, and pads.

For cornering im gonna go through my whole suspension and upgrade the bushings to polyperathane and have full adjustable coil overs and a better then stock anti roll bars. Im looking at probably 2.5-4k in suspension alone and thats gonna be the first thing im gonna do.

Any help pointing me in the right direction is fine, im new to all of this so I want to go slow.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on September 14, 2016, 01:58:15 AM
Hey Matt should I beable to use the full GTX suspension, or will I have to hybridize it? I was wondering because I'll have a whole GTX  parts car(The body is too bad to restore) so I was wondering if I should buy a GTX coilover kit.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on September 15, 2016, 09:16:36 AM
Not sure. I used front Capri struts and a weird rear strut combo from a Mazda 626 (it works, but barely)

I don't know if the rear struts bolt up. You may have to use the stock Capri upper mounts with the GTX struts.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on September 20, 2016, 09:17:59 PM
Quick question, can I use a normal FWD G-type gearset to refresh the gears in the AWD G-Type, or are they incompatible? I was wondering because of the 3-5th swap that Chrispoe was talking about.
Also Matt how will keeping the B6T affect the swap, what things should I avoid doing? Huge thanks guys for being so helpful, it means the world to me!
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: chrispoe on September 22, 2016, 03:57:29 PM
The 1st-5th  and reverse gears themselves should be interchangeable with all other G series boxes, but I’m not sure if the single cone synchro rings of the early trannys can be upgraded to the double cone synchros found in later tranny’s.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on November 12, 2016, 12:49:45 PM
@AZGTX Am I looking for the 90-94/1.6l  LSD or the later 1.8l Torsen?
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on November 17, 2016, 08:03:00 PM
Alright I just did a ton of researching on ClubProtege, and other various Ford/Mazda forums.

What I dug up was the Plate Mod by Ferdi, thats no longer being made. I heard on one of them someone has ripped off his design, and are now reselling it. Also while I was searching around I saw of the 3-5th straight cuts Chris was talking about.

In order to build a "strong" G-Series AWD I am thinking of the parts/treatments done bellow:
3-5th Straight Cut Gears
Plate Mod if available
BG GTX G-Series(Due to the front LSD diff/viscous unit)
Cryo-treatment/Shotpeening of gears, shafts, and snychros

Questions:
I was looking around, and saw that the Kia tranny has a larger final drive but it wont fit into the awd case, is there any larger final drive that works in that case?



Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on November 23, 2016, 09:50:40 PM
I believe you are stuck with the AWD ring gear, as it drives the center diff. Im pretty sure it's proprietary to the AWD trans
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on November 25, 2016, 11:09:19 PM
Hey Matt what size exhaust is on the GTXR2? Im In the preliminary stages of getting my turbo build along, so im trying to figure out what size I will need.  I plan on running a side pipe so I wont have to deal with the axel bends.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: Rocketman on November 26, 2016, 12:21:29 AM
There's far more room over the AWD axle than there is on the FWD, and the bends are much simpler. That said, I run a 2.5" exhaust
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on December 15, 2016, 06:50:24 PM
What metal is the GTX trans made of? I was wondering because I just heard of a treatment called WPC its like shot peening but the grains are way smaller meaning it makes the item being treated alot stronger.  What i was readjng said alot of Evos and WRXs use it on there AWD trans to stop flexing,  but the downside is it doesnt work on aluminium.  Have you guys heard of this being used on the GTX trans to any success?
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: azgtx on December 15, 2016, 09:03:40 PM
It is the same as any of the Mazda trannies E, F or G fwd or awd  same stuff. There is a plate mod out there that is machined into the end of the case to help stop the flex under high torque. This causes the primary shaft and the secondary shaft to wander away from each other thus shearing gears..usually 3rd at first then the bits take out the rest. I have seen it take out fifth gear as well. The plate mod stiffens the end of the case where the ends of the shafts live. Only one guy that I know of in the US that was doing these but he has since retired from it. Best to just be nice to them....or have a shed full of good spares waiting for the chopping block. But honestly I have never broke one in all the years..just stay away from clutch dumps.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on December 16, 2016, 12:11:46 PM
If I could even find the plate mod would it even fit into the AWD trans?
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: azgtx on December 16, 2016, 08:47:44 PM
They were originally made for the fwd BG g series and for the life of me I can't remember if they would work on either BF or BG awd trannies. Honestly I would not worry about it. Just make sure yours is good and be good to it. There is always the All Trac that guys are using from the Celica GT4's. A whole lot of work though.
Title: Re: G-Series Transmission/GTX Transmission Info
Post by: WashiestSnake on December 16, 2016, 10:29:03 PM
Thanks Clay as always youre a great help!