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Author Topic: Pulled motor to do rings and head gasket, and got super carried away! new pics!  (Read 2975 times)

Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
    • http://www.werbatfik.com

Found a great page with info on the Miata CAS:
http://www.rivercityroad.com/garage/cas.htm
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


EShepherd

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  • Posts: 239
    • 1991 Capri XR2, 1991 Capri XR2 Rusted out Shell

Hey Aus, I'm also in the same position as you. I really, really want to get Megasquirt (or Microsquirt) running on my car, but it's a TON of information to digest, and it's intimidating. I've been emailing back and forth with an old friend I used to run rally cross with, who has his old Escort running on MS3. I've been picking his brain and trying to figure out specifics. One of these days when I've got the time, I'm going to write up everything that seems pertinent, post it to the DIY Auto Tune forums, and let those guys pick it apart and correct it all. Once they're done, I should have a good idea of how to go about installing the Megasquirt.

At that point, I'll post parts lists, instructions, and pictures over here. As well as the results once I'm all done.


If you're going to go ahead and try to get it to work, I definitely suggest reading as much as you can on the thing. It's not complicated per se, but there is a lot going on and you'll need to understand it if you want to get the full potential out of it. There's all kinds of goodies you can do with it up an running. No lift shift, anti-lag, launch control, sequential injection, etc. Even just being able to datalog will be huge, especially for you running that giant turbo. On that note, there's also really good knock control and mitigation functionality in Tuner Studio.

If you buy this, keep us posted on how the install and setup goes. I'd love to see someone have it working in their Capri before I jump into it.
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Aus Capri

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  • Posts: 99
    • 1989 Capri Turbo

Hi guys here's an update on my e85 experimentation. After a few test drives with the e85 and 560cc evo injectors, I found it to run very similar to how it ran before on premium petrol with 360cc BPT injectors. It's a little bit more rich in the lower rpm but leans out at around the same boost as before at around 17 - 18 psi. It's a shame it leans out there because once it hits around 22psi it's in its element and is a totally different car but 13-1afrs! So its a no no. I locked the boost in at 18psi and gave it some pulls and it's good but after feeling it pull at 30psi when I ran the dodgy injector it feels lacking, don't get me wrong at 18psi on this monster turbo it does go hard but at 30psi on this monster turbo its absolutely insane (in a good way) I'm only guessing here but it feels like at least another 100-150hp going from 18psi to 30psi.

I don't know what to do, i'm not confident in my ability to install a stand alone my self and can't afford7 to pay some one to do it. It will cost heaps here in Aus, every bloody thing seems to cost more here!  I'm not even confident I'll order one that's compatible 😂. I know a guy here in Sydney that can alter my wiring harness to take a microtech though I have read it will only offer fuel tables up to 20psi and I want to run 30ish so it's probably not a great option, it's also gonna cost me $700 for the ecu and harness and it's a second hand old  basic unit no knock control and it will still use a distributor (BPT dizzy or welded b6t dizzy) He says it's the only ecu he knows how to wire into our harness.

I'm so disappointed about the uneven fuel distribution of the dodgy 5th injector, I was considering mounting 4 more injectors into the intake manifold one on each runner to work around the problem but it would be a bit ridiculous.

« Last Edit: May 19, 2021, 11:16:22 AM by Aus Capri »
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Aus Capri

  • Jr. Member
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  • Posts: 99
    • 1989 Capri Turbo

Hey Rocket man when you were running the dodgy injector set up do you know what your AFR's were getting ? As you said before about running lean on cylinder 2 and 3 but still having an acceptable Afr as its an average of all four cylinders. Do you think I could get away with it by targeting a rich afr say 10-1, I know its still gonna be uneven but safer?

Here's my thinking, if AFR's average out at 12-1 across all 4 cylinders.  Cylinders 1 and 4 may be 11-1 and Cylinders 3and 4 may be 13-1. Then say I target an average Afr of 10-1, Cylinder 1 and 4 may be 9-1 and cylinder 3 and 4 may be 11-1 obviously not correct values just trying to visualise the difference in afr across the 4 cylinders

I need 4 widebands! I'd love to know the difference in afrs!
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EShepherd

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    • 1991 Capri XR2, 1991 Capri XR2 Rusted out Shell

Couldn't you just toss higher flow injectors on there? Theoretically, the ecu would run them at the same duty cycle as the factory ones, right? That'd give you more flow across the whole rev range, if it worked that way. Or would that make you too rich at low boost? Then again, I'd much rather be too rich than too lean.
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Aus Capri

  • Jr. Member
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  • Posts: 99
    • 1989 Capri Turbo

That's what I was hoping to achieve with the 560cc injectors but it was way to rich at low rpm on straight petrol, runs ok on e85 but works out to only support roughly the same amount of power as the 360cc injectors, due to the lower energy content of e85
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EShepherd

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    • 1991 Capri XR2, 1991 Capri XR2 Rusted out Shell

What if you installed a fuel pressure regulator that is boost referenced? That way you could increase the pressure going to the injectors as the amount of boost increases? I've never tried using one on a car with a factory computer that I wasn't able to tune, but it might be a decent enough band-aid solution? They are significantly cheaper, and way easier to install, than a full stand-alone.

Edit:
Something like this: https://www.amazon.com/Hypertune-Adjustable-Pressure-Regulator-Reference/dp/B08MZRT2K5/ref=sr_1_8?crid=3I9L2OK45XWCL&dchild=1&keywords=boost%2Breference%2Bfuel%2Bpressure%2Bregulator&qid=1621603756&sprefix=boost%2Breferenced%2Bfuel%2Bpre%2Caps%2C156&sr=8-8&th=1

It's got a vacuum port that you can hook up to a boost source, so for every psi of boost it sees, it raises fuel pressure by 1 psi. It's definitely not an elegant solution, but it'll at least make you LESS lean at high boost.
« Last Edit: May 21, 2021, 09:31:54 AM by EShepherd »
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Aus Capri

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  • Posts: 99
    • 1989 Capri Turbo

I'm pretty sure the sock fuel regulator will raise 1-1 already, if I used a FMU like a vortec with a higher rise rate than 1 to 1 maybe, you can change the springs in them and adjust the rise rate up to 12pounds of fuel for every 1 pound of boost. OBX sells a cheaper version too
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Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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dude, you've got a nice motor, do the right thing
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


Aus Capri

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  • Posts: 99
    • 1989 Capri Turbo

Hi guys here's what I've been up to, I know rocketman told me to do this properly but I am not confident installing a standalone ecu and I really can't afford to pay someone to install one and tune it so I have proceded to try and find a work around for turning up the boost.

I have removed the e85 and have switched the fuel back to  premium petrol. I got an adjustable FMU which can adjust the base pressure and has a bleeder valve on the top which adjusts the rise rate.

Here's a link to the FMU,
 https://www.ebay.com.au/itm/10-100-PSI-Billet-adjustable-FMU-Blue-/184870547891?mkcid=16&mkevt=1&_trksid=p2349624.m46890.l49286&mkrid=711-127632-2357-0

The way the rise rate is affected is if the bleeder valve fully open its a  1-1 rise rate. Fully closed it is a 14-1 rise rate. I have modified the way the FMU bleeds air off by changing it to have 2 bleeder valves and have installed solinoid valve  triggered by a pressure switch to isolate one of them after 20psi. This allows different rise rates to be used at different boost levels. I still have the 560cc injectors in the car and  now a base pressure of 25psi, it has a rise rate of  around 11 up to 20psi which brings the fuel pressure up to about 50psi. As the boost triggers the pressure switch to isolate one of the bleed screws at just after 20psi of boost, the rise rate changes and the fuel pressure jumps up to around 70psi at 21psi and then up to around 85psi fuel pressure at 30psi of boost.

You may have to read that a few times to get your head around it! I'll post a vid demonstrating how it works tomorrow.

The stock fuel pressure regulator has a rise rate of 11 and a base fuel pressure of around 40psi. When I apply 30psi of boost to the stock pressure reg the fuel pressure jumped to 70psi.

Installing this fmu has allowed me to run the bigger injectors on petrol with out bogging  and spluttering at low rpm by lowering the base pressure to 25psi, and to fully take advantage of the 560cc injectors in the higher rpm. It basically makes the car run how it did on 360cc injectors up to 20psi of boost then after 20psi of boost they become the bigger 560cc injectors  and delivering a slightly higher than usual fuel pressure! 

It's still in the testing stages and I haven't had time test it more than once, but it seems to be working. I'll take some vids to show you all how it works tomorrow and try get some vids of driving  soon too! Hope your all good great to see Shepherds build, coming along!




« Last Edit: August 05, 2021, 10:15:31 AM by Aus Capri »
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Aus Capri

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    • 1989 Capri Turbo

https://youtu.be/rzDsMyWMOH0

Here is a quick video of a third gear pull with the experimental 2 stage fmu. It runs lean around 20psi then you can see the switch and it runs rich to 30psi at redline and bashes the redline a bit. I'd love to know how much power this is making at the moment! It feels really dodgy though, in the vid you can see I'm fighting it to try and keep it in a straight line.
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