F2T - Minimum wiring needed to run the engine - Mazda MX-6 Forum
 
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post #1 of 7 (permalink) Old 1-27-13, 13:11 Thread Starter
 
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F2T - Minimum wiring needed to run the engine

So obviously you would need the entire engine harness to the ECU. However, of the fuse and relay blocks, what is needed and what could be cut away.

Opinions are welcome if easier to simply wire up the couple of relays and fuses needed to get injector, ignition, and ECU powered.

Jeff ~ 1995 PGT ZE-T MSnS-E v3 (317whp @ 8.5psi / 275whp @ 5.5psi)
PARTING A LOT OF 2g and 1g STUFF
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post #2 of 7 (permalink) Old 1-28-13, 19:14
 
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Quote:
Originally Posted by Fastest95PGT View Post
So obviously you would need the entire engine harness to the ECU. However, of the fuse and relay blocks, what is needed and what could be cut away.

Opinions are welcome if easier to simply wire up the couple of relays and fuses needed to get injector, ignition, and ECU powered.
you can disconnect and remove every sensor on the firewall , including every single vacuum line except knock control . everything on my firewall is gone, including egr . on all my cars

1990 mx6lx 13.5@102.9 on 87shot
1989 white pgt 486whp 543wtq@29psi..dynoed 11-9-13
1991 probe gt 373whp at 24psi
1988 mx6gt 461whp @32psi
1990 mx6lx 348whp@ 18psi slipping clutch
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post #3 of 7 (permalink) Old 1-28-13, 21:13 Thread Starter
 
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Quote:
Originally Posted by ademan View Post
you can disconnect and remove every sensor on the firewall , including every single vacuum line except knock control . everything on my firewall is gone, including egr . on all my cars
Thanks ademan, I trust your opinion.

With every firewall sensor disconnected, I expect many CEL codes will show up on the stock ECU. That's okay. Will any of those codes cause the ECU to put the engine into a limp mode?

Jeff ~ 1995 PGT ZE-T MSnS-E v3 (317whp @ 8.5psi / 275whp @ 5.5psi)
PARTING A LOT OF 2g and 1g STUFF
FS: Borla for sale.
FS: Clear headlight covers, headlight, fog, tail, gauge cluster
90 PGT MTX with 97k original miles!
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post #4 of 7 (permalink) Old 1-28-13, 21:30
 
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Quote:
Originally Posted by Fastest95PGT View Post
Thanks ademan, I trust your opinion.

With every firewall sensor disconnected, I expect many CEL codes will show up on the stock ECU. That's okay. Will any of those codes cause the ECU to put the engine into a limp mode?
no, the only cel you will get is the ocassional egr code when you cruising, other than that . the ecu will work perfect and run better. without all the other crap. ball you have to do after geting rid off all the crap on the firewall, is run the bov/boost gauge.... vacuum straight to the IM,and the back of your motor will look better.

this is my old daily driver i just sold. its now running 23-24psi on stock ecu /fcon.



https://www.youtube.com/watch?v=J47YkmeQBVY

1990 mx6lx 13.5@102.9 on 87shot
1989 white pgt 486whp 543wtq@29psi..dynoed 11-9-13
1991 probe gt 373whp at 24psi
1988 mx6gt 461whp @32psi
1990 mx6lx 348whp@ 18psi slipping clutch

Last edited by ademan; 1-28-13 at 21:35.
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post #5 of 7 (permalink) Old 1-29-13, 7:28
 
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This is good info to know when I start swapping my F2T in.

Currently driving: 98 GMC K1500
Project: 89/90 MX-6 GLX hybrid
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post #6 of 7 (permalink) Old 1-29-13, 8:03 Thread Starter
 
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Quote:
Originally Posted by ademan View Post
no, the only cel you will get is the ocassional egr code when you cruising, other than that . the ecu will work perfect and run better. without all the other crap. ball you have to do after geting rid off all the crap on the firewall, is run the bov/boost gauge.... vacuum straight to the IM,and the back of your motor will look better.
Awesome that a lot of CEL codes won't trigger as it will make my project easier to shake out issues if the CEL is actually meaningful.

Any idea how I would wire up a CEL if not using the stock gauge cluster? For now, I do have access to the original gauge harnesses if it's a wire on that. I have not trimmed those off yet.

I'll have to look at your video later, YouTube is blocked here at work.

Jeff ~ 1995 PGT ZE-T MSnS-E v3 (317whp @ 8.5psi / 275whp @ 5.5psi)
PARTING A LOT OF 2g and 1g STUFF
FS: Borla for sale.
FS: Clear headlight covers, headlight, fog, tail, gauge cluster
90 PGT MTX with 97k original miles!
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post #7 of 7 (permalink) Old 1-29-13, 17:41

 
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realistically, there are 2 relay's that are needed to run the engine. The ECU triggers the fuel pump relay which is under the ECU. You'll also need to keep cooling fan relay(s) if you want to run the standard fan, especially if you have the dual speed fan found on the autos.

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