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Author Topic: BP Swap  (Read 71619 times)

WashiestSnake

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Re: BP Swap
« Reply #60 on: March 05, 2017, 04:39:38 PM »

Automotive wiring is simple!
Well I was the main designer/wirer for my high school robot team, and lets say we went threw quite a few fuses getting it up and running. We ended up doing pretty well in our series though.
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1991 Mercury Capri 68,xxx Miles--Project(AWD)
1996 Lincoln Continental -- The Boat(Given to my Brother)

Rocketman

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    • 91 BPT AWD Capri & 1991 XR2
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Re: BP Swap
« Reply #61 on: March 05, 2017, 05:38:03 PM »

You should be fine then.

Here's why it's simple, there's

Constant +12v
Switched +12v
Ground
Sensor wires (some are sensor supply wires: +5v, others return the signal to ECU, others are routed through the main harness to supply the gauges)

(at least this is applicable to our cars, newer stuff borderlines black magic with data lines and such)

You get the wiring diagrams/pinouts and run through the wires, matching them wire for wire.
I'm not familiar with the EVO8 ecu wiring. To get it running (after connecting everything to the engine) you should only need to apply +12v, Switched 12v, and ground to the ECU.

To get the gauges to work, you'll need to jump the sensor wires from the ECU harness to the chassis harness. I'm not sure if the EVO ecu is programmed to use the stock sensors, or if you need to add some. This is where it might get a bit tricky, as the gauges are designed to work with the stock sensor. You can get programmable gauges, get gauges with their own sensor, or simply keep the stock sensor & double up and add the extra one the ECU needs.

The start/charge harness is mostly independent of the engine harness. (which is really nice) There is a plug that jumps power to the engine harness (i think for the injectors) but the folks providing the new harness for you should have the pinout & power requirements.

The only extraneous thing I can think of that may not be accounted for is the radiator fan switch/relay, I think this is part of the engine harness, but I'm having a hard time remembering how it's routed. This isn't a big deal to sort, though - and the EVO ecu may have a programmable/digital trigger for this anyway.
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1.8L Turbo All Wheel Drive Capri... the "GTXR2"


chrispoe

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    • 91 BP Capri GT
Re: BP Swap
« Reply #62 on: March 06, 2017, 08:14:14 PM »

Like Rocketman said, automotive wiring is easy.

Actually the BF engine harness connects to the driverside fender harness via three wires(blue=12V engine fuse, black/white=12V ignition switch, and yellow/blue tach signal). When you remove the BF engine harness, you’ll also end up removing the main injection system relay that is wired directly into the engine harness on the BF. So you’ll need to either splice the old relay or a universal to the blue and black/blue wire on the fender to provide power to the engine harness for the injectors and coils. (this was part of the reason why I used the engine fuse box from the escort cuz it already has a relay for injection and cooling fan built into it.)

The starting/charging harness is completely separate of the engine harness and already contains the voltage and oil pressure signals to the instrument cluster.
The instrument cluster’s engine temp gauge and radiator fan switch have their own wiring harness that comes out from the radiator fan harness next to the driverside headlight bucket.
The only instrument gauge that comes from the engine harness is the tach signal.  IMHO…This will be the trickiest part cuz the EVO ecu uses a sourcing +5V as a tach trigger while the Capri tach uses a 0V sinking tach. I explained a work around for this on Clubprotege a while ago.

The underdash wiring will require some minor work to wire the ecu and fuel pump relay. You also need to add two jumper wires to the dash harness to retain the key reminder chime and to make the radiator fan operate via the coolant switch.(I reused the AC switch to operate a relay that disconnects the one  jumper so I can manually turn the radiator fan on via AC switch too) 

The wiring in the Capri may seem confusing, but it’s not bad at all. What’s very apparent is the fact the BF chassis was electrically designed for carbonated engines. Once you look at it from this prospective, it becomes very obvious the electrical system was actually an afterthought and why wiring/relays are scattered around the way they are.


For the Evo ecu swap you’ll also need the Miata CAS, map sensor, air intake sensor, coil packs, ect.... I think BP Performance sells the entire bundle for $895 if I remember correctly.
« Last Edit: March 06, 2017, 08:20:43 PM by chrispoe »
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WashiestSnake

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Re: BP Swap
« Reply #63 on: March 06, 2017, 08:55:14 PM »

Thanks Matt, and Chris for all the help explaining stuff. Im actually getting taught from a work friend who has now become a wiring technician, so the engine harness should be good.
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1991 Mercury Capri 68,xxx Miles--Project(AWD)
1996 Lincoln Continental -- The Boat(Given to my Brother)

WashiestSnake

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    • 1991 Mercury Capri
Re: BP Swap
« Reply #64 on: January 10, 2018, 08:45:50 PM »

About to get started on the Escort G-Series, what axels and mounts do I use, will it be XR-2? I'm going to put a N/A BP in at the same time, if that matters....
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1991 Mercury Capri 68,xxx Miles--Project(AWD)
1996 Lincoln Continental -- The Boat(Given to my Brother)

Pavelovable92

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    • Mercury Capri ´91 BP Swap
Re: BP Swap
« Reply #65 on: August 26, 2021, 12:08:22 AM »

Hello guys, is anybody out there, who can help me with my non turbo bp swap '91 mercury?
Together with my boss, we swaped a bp out of a mazda 323 into a 1991 mercury capri.
Now I try to connect the ecu (BP05) to the original mercury harness. The wiring is the main problem. But I already got it nearly started. only a few signals are different.
So it's now to you. Who can help me with the wiring from mercury harness to the bp motor? Does anybody have a writeup for wiring? Especially for wire colors and function and so on?
And by the way, does anybody have a connector pinout of the VAFM from BP05 and the TPS connector?
I hope, that anyone can help me. (And sorry for my english, I'm from germany.  :P )
« Last Edit: August 26, 2021, 01:02:19 AM by Pavelovable92 »
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greywolf27030

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Re: BP Swap
« Reply #66 on: August 26, 2021, 07:06:05 AM »

You may have better luck with swap questions on the Festiva Forum. They do a lot of B6/BP swaps for the B3. Good luck with it, let us know how it comes out and include pictures.
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Jack Byrd

Pavelovable92

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    • Mercury Capri ´91 BP Swap
Re: BP Swap
« Reply #67 on: August 26, 2021, 07:20:16 AM »

You may have better luck with swap questions on the Festiva Forum. They do a lot of B6/BP swaps for the B3. Good luck with it, let us know how it comes out and include pictures.

Which forum do you mean? Is it here at TeamCapri?
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greywolf27030

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    • 1991 XR2, 1992 XR2, 1993 XR2
Re: BP Swap
« Reply #68 on: August 27, 2021, 08:13:50 AM »

You may have better luck with swap questions on the Festiva Forum. They do a lot of B6/BP swaps for the B3. Good luck with it, let us know how it comes out and include pictures.

Which forum do you mean? Is it here at TeamCapri?

https://fordfestiva.com/forums/
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Jack Byrd

chrispoe

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    • 91 BP Capri GT
Re: BP Swap
« Reply #69 on: August 27, 2021, 08:57:36 PM »

I did the BP swap to my 91 N/A  about 19 years ago. When I did the swap, I ended up using the BP's ecu, both engine wire harnesses, and the engine bay fuse box. The reason for this was primarily due to the BP's ignition setup. The Capri's ignition control is all done in the distributor which then just sends a signal to the ignition coil mounted on the VAF.

The BP on the other hand, the distributor sends out a fixed position crank and cam signals via hall effect sensors (same as a Miata) to the ecu. Then the ecu sends a ignition signal to the ignition control module located on the mounting bracket for the main fuse box(the BP's main fuse box also has the ignition relay located within it unlike the Capri where it connect directly to the engine wire harness and mounted on the fender wall.

In hindsight, the easiest way to do the BP swap into a Capri is to use the Capri's ecu, wiring, sensors, fuel injectors, and distributor on the BP. The only catch is the Capri's ecu won't be able to control the variable intake system, but a simple RPM activated switch could be used instead to activate the solenoid.


Are you trying to use the BP05 ecu on the Capri's engine wire harness?

Edit...Which BP05 ecu are you trying to use? The automatic transmission equipped BP's use a TPS with a potentiometer similar to the Capri. The manual transmission equipped BPs use a TPS that contains just a pair of switches for throttle position of idle or wot.
« Last Edit: August 27, 2021, 09:13:03 PM by chrispoe »
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Pavelovable92

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    • Mercury Capri ´91 BP Swap
Re: BP Swap
« Reply #70 on: August 28, 2021, 09:29:41 AM »

I did the BP swap to my 91 N/A  about 19 years ago. When I did the swap, I ended up using the BP's ecu, both engine wire harnesses, and the engine bay fuse box. The reason for this was primarily due to the BP's ignition setup. The Capri's ignition control is all done in the distributor which then just sends a signal to the ignition coil mounted on the VAF.

The BP on the other hand, the distributor sends out a fixed position crank and cam signals via hall effect sensors (same as a Miata) to the ecu. Then the ecu sends a ignition signal to the ignition control module located on the mounting bracket for the main fuse box(the BP's main fuse box also has the ignition relay located within it unlike the Capri where it connect directly to the engine wire harness and mounted on the fender wall.

In hindsight, the easiest way to do the BP swap into a Capri is to use the Capri's ecu, wiring, sensors, fuel injectors, and distributor on the BP. The only catch is the Capri's ecu won't be able to control the variable intake system, but a simple RPM activated switch could be used instead to activate the solenoid.


Are you trying to use the BP05 ecu on the Capri's engine wire harness?

Edit...Which BP05 ecu are you trying to use? The automatic transmission equipped BP's use a TPS with a potentiometer similar to the Capri. The manual transmission equipped BPs use a TPS that contains just a pair of switches for throttle position of idle or wot.

Hi chrispoe,

I try to use the bp05 ecu on the capri's engine wire harness.
I also swaped the distributor to one of the mazda 323 wirh hall effect sensor and I addet the ignition control module.
And I'm using the manual transmission ecu. So I changed the TPS to the 2-connector-switch version.

Now 2 questions. What kind of signal comes to the "new" tps? Gnd or ref voltage? Some wiring plans are a little confusing.

And by the way, thx for your help!!
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chrispoe

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    • 91 BP Capri GT
Re: BP Swap
« Reply #71 on: August 28, 2021, 07:11:08 PM »

Well that definitely complicates things a bit.

The BP manual TPS uses a ground for the common terminal. This wire also connects to the physical ground, goes to the engine temp sensor, the VAF, and pin "D" on connector 205 of the BP05 ecu. With the Capri wire harness, the wire is blue/yellow stripe and will require you to add a ground point.

Which wire schematics are you using? The ones I have for the BP is from the Escort GT Haynes manual and it's way better then the Capri service manual wiring schematics.


Have you wired up the check engine light, do you see the lamp turn on with the key in the "run" position, and if it does turn on, checked for any codes?

Did you connect the tach and do you see the tach bounce while cranking the engine?

Are you using the Capri or the BP vaf?

« Last Edit: August 29, 2021, 07:06:16 AM by chrispoe »
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Pavelovable92

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    • Mercury Capri ´91 BP Swap
Re: BP Swap
« Reply #72 on: August 29, 2021, 07:31:44 AM »

So the blue/yellow wire has to be connected directly to ground? For a direct ground point?

I use wiring schematics from the mazda 323. But if there are some better schematics I would be glad to see them.

The check light is not connected yet. And also the tach wire, because I have to look, where to connect it.

And the vaf, I've got the BP version. But I also can use the capri vaf. They are both in my garage.

Do you know more about the pin for the fuel pump on the vaf and where to connect it?
« Last Edit: August 30, 2021, 09:14:58 AM by Pavelovable92 »
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chrispoe

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    • 91 BP Capri GT
Re: BP Swap
« Reply #73 on: August 30, 2021, 10:08:45 AM »

Yes, you'll need to add find a place to attach the blue-yellow wire directly to ground.

The check engine light wire is light green/red on the first plug to the ecu, this wire will go to C204- pin E (there are two light green/red wires in the Capri wire harness, one in the first ecu plug and a second one in the middle plug that's for the VAF Voltage)

You should use the BP VAF, looking at the plug on the VAF itself the pins from left to right are:
1. Fuel pump >  green/white
2. ground
3. ground
4.VAF Voltage > light green/red > C205-pin K
5.Referance common >  blue/yellow > C205-pin D
6.VAF pos signal > light green/black > C205-pin O
7.Air temp signal > brown/yellow > C205-pin P

This will leave you with an extra wire in the wire harness that's yellow/green that you can cap off.

If I find time latter today I'll upload my scans of the BP electrical system and my wiring notes to my dropbox and post a link.
« Last Edit: August 30, 2021, 10:11:48 AM by chrispoe »
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Pavelovable92

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    • Mercury Capri ´91 BP Swap
Re: BP Swap
« Reply #74 on: August 30, 2021, 10:51:29 AM »

...
If I find time latter today I'll upload my scans of the BP electrical system and my wiring notes to my dropbox and post a link.


That would be awesome! Thank you very much. Your informations are very helpful for me.
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