efi 302 into a none efi 85 mustang

[mustang378]

i have a 86 grand mar with a efi 302 and i would like to put in a 85 mustang gt that had a none efi 302.the doner car runs fine and is all there.can some one tell me what i have to do as far as the wireing goes???? or a web site. that could help me... thanks

 

[bynummustang]

You'll need the computer and harness from that motor.

 

[85ragtop]

This falls under 5.0 tech.
Thread moved.

 

[93 LX]

the real question is why kill the only stang with a carb and roller cam? Why not build the carbed engine? Besides I think the engine you want to use if a non HO engine and if you still want to use EFI then get a later HO engine out of a MK7 or Mustang......

 

[mustang378]

i have the roller motor that came with the car but its now a 347 and is a drag motor that that ran low 10. its too much for the street. want to turn the car back to a daily driver. and save the motor for later.

 

[mustang378]

what is the diff. between a none ho and a 302ho

 

[slow84lx]

what is the diff. between a none ho and a 302ho

302 non-HO cam uses the normal firing order for 302 engines going back to the 60's.

302 HO cam uses the same firing order as a 351W.

Don't get too caught up in it. It is only a firing order change and doesn't necessarily denote any power increase. Early HO engines weren't exactly powerhouses.

 

[slow84lx]

i have the roller motor that came with the car but its now a 347 and is a drag motor that that ran low 10. its too much for the street. want to turn the car back to a daily driver. and save the motor for later.

It seems like it would be very easy to just put a milder engine / carb combination in your '85 to make a nice street car. If you've made some low 10 sec passes with your current combination then you know how to make the carb work right already. Maybe consider a good carb / intake combination. If you go EFI you will need to do a lot of custom wiring or get a full wiring harness from a later model mustang and replace. It can be worth it if you want EFI but it is not a simple swap. You could swap the engine / carb out and be running in a weekend.

Just my $.02.

That said. I have the complete wiring harness from an '89 donor car in my garage to swap my '84 CFI car over to SEFI and will be doing this between now and Christmas. I do know of a couple of threads on another website that provide some information on this. If you are interested send me a PM and I will point you that way.

 

[NIKwoaC]

302 non-HO cam uses the normal firing order for 302 engines going back to the 60's.

302 HO cam uses the same firing order as a 351W.

Don't get too caught up in it. It is only a firing order change and doesn't necessarily denote any power increase. Early HO engines weren't exactly powerhouses.

This is a false statement. 87-93 SEFI "High Output" motors came with a better breathing cam, heads, intake, and throttle body than did the "base" 302s, and made about 25 more horsepower. Also, except for the '93, HO motors came with forged pistons, and I do not know if the base engines did or not. That '86 Merc engine would be a turd compared to a HO motor in your car, and it might have flattop pistons anyway, which would end your choices for cylinder head upgrades.

fordfuelinjection.com is a good place to start looking for EFI information.

 

[slow84lx]

This is a false statement. 87-93 SEFI "High Output" motors came with a better breathing cam, heads, intake, and throttle body than did the "base" 302s, and made about 25 more horsepower. Also, except for the '93, HO motors came with forged pistons, and I do not know if the base engines did or not. That '86 Merc engine would be a turd compared to a HO motor in your car, and it might have flattop pistons anyway, which would end your choices for cylinder head upgrades.

fordfuelinjection.com is a good place to start looking for EFI information.

Not false at all. I answered his question correctly. Where in this thread is there any mention of any engine newer than 1986 until your post? Get off your high horse.

Early HO engines were virtually the same with a 351W firing order just as I said. The '85 HO is the first Ford engine to use a roller cam. When you get to the injected engines is when the changes were more pronounced. Not all HO engines had forged pistons until '86. Heads were nothing special. The same parts were used on trucks.

I agree that the '86 Grand Marquis engine would be a poor choice as a replacement for a '85 HO carbed engine. It would be an absolute turd. Wrong everything.

A good choice for the OP would be a '89-'93 donor car to get the wiring and drivetrain from. This would be a good foundation for a nice running SEFI setup.



BTW - NikwoaC - nice looking car in your sig.

 

[NIKwoaC]

Not false at all. I answered his question correctly. Where in this thread is there any mention of any engine newer than 1986 until your post? Get off your high horse.

Early HO engines were virtually the same with a 351W firing order just as I said. The '85 HO is the first Ford engine to use a roller cam. When you get to the injected engines is when the changes were more pronounced. Not all HO engines had forged pistons until '86. Heads were nothing special. The same parts were used on trucks.

I agree that the '86 Grand Marquis engine would be a poor choice as a replacement for a '85 HO carbed engine. It would be an absolute turd. Wrong everything.

A good choice for the OP would be a '89-'93 donor car to get the wiring and drivetrain from. This would be a good foundation for a nice running SEFI setup.



BTW - NikwoaC - nice looking car in your sig.

Sorry man, I don't mean to be on a high horse, but I do mean to steer the OP in the right direction. The fact that he is looking for a EFI swap indicates that he is interested in a 86+ motor, not an early, carburetor motor. While I agree with you that early HO motors weren't real great performers, if he is going to swap in a SEFI 302, he should know that the later HO (Mustang) motors are his best bet. I would further agree with your last post, finding an '89 or newer donor would be best, because of the included MAF components.

Thank you for the compliments. If everything goes right, she'll be getting full Cobra brakes, MM suspension, and 17" staggered wheels while she hibernates this winter!