gnxregal563

i just bought a 93 z28 it has no engine or tranny,and i just want to get it on the road,so is a 93 engine and tranny the only engine that i can just drop in and go? i know were there is a 95 engine for sale locally would that work if i had that engines, engine harness and computer,what else would i need to make that engine work or would it be better to just find a 93 engine/tranny?

gelbza

Yeah a 95 should work as long you have the computer and wiring harness. The only real differences engine wise were the change from Speed Density to Mass Air Flow in 94, and the automatic transmission changing from the 4L60 to 4L60E (computer controlled). But those problems are both solved by having the computer and wiring, so you should be good to go.

RamAir95TA

It depends on the wiring harness/PCM you use. If I were you, DEFINITELY go for a 94-95 PCM/wiring harness and a 95-97 engine/transmission. This will give you a flashable OBDI PCM (93s require chip burning) and a vented optispark. If you do go with a 96+ motor, all you need is an OBDI knock sensor and you're good to go.

You don't specify what transmission you're planning on using though. If you want an automatic, you need to make sure you get a PCM from an auto car. If you want a 6-speed, either an auto or manual transmission PCM will work. You can have the shift tables programmed out of the PCM by any good tuner like www.pcmforless.com. With the T56 though, it's bolt-in and go. With the auto, you MIGHT have an issue with the TCC solenoid operation. I forget the specifics but it is easily dealt with.

Good luck, and welcome to the forums.

Fatdog2

Might check with the dmv first.They will smog the car as a 95,so get ready.(California).

gnxregal563

i want to use a automatic. the 95 engine is a 6 speed engine so would have to use a 95 automatic with that engine? i really don't want to mess with a bunch of converting electically stuff over. i am going to leave the engine stock for now, so would it be easier to just find a 93 engine and tranny i just want to get it up and driving for the least amount of money and hassles i really just want to drop in a engine/tranny, so is the 93 drivetrain the only combo that will drop in and go? thanks

shoebox

If you use anything but a 1993 computer and engine harness, there will need to be some electrical conversion work done. 93s used a computer different from all other years and the harness only works with that computer. If you used a 94-95 computer, a 1994 harness would be the closest fit to your chassis connectors, but you still may need to do a few reconnections.

You could can use any year engine, if you just want to use the 93 computer and harness (if you already have it). You just hook up what is necessary and forget about anything else that does not apply to that year.

Mystery Bird

Will a 94-95 harness plug into his 93 under the dash? I thought it was different.

shoebox

AFAIK, the under dash connectors from the engine harness are the same 93-97. Some of the pinouts are different.

TBSPW

hey shoebox im actually in almost the same situation....i have a 96 M6 and am looking at a 93 A4....the 93 body is pretty good and i just want to switch the motor from the my 96 into the 93....would it be easier swap the engine and trans or just the engine?...should i convert the 93 to obd2 having both cars to hack apart? any input would be great

shoebox

There are going to be differences to have to deal with no matter which way you go. Deciding on which transmission you want to use may be the first big step. If you are going to keep it OBD-II, it would probably be easier if you kept the M6. If you use the 93s computer and harness (OBD-I), then using the A4 would be easier. Either way, there is going to be some wiring conversion to be done.

TBSPW

a couple friends of mine suggest just sticking with the 0bd2 and the 96s M6 and engine and just puttin it all in the 93....i doubt its going to be the hardest thing in the world pry just a bunch of little things that get in the way...is there any major problems that come with this or anything that everyone seems to over look or forget about?....i assume having both full cars will make life easier

TBSPW

hey shoebox after rereading this whole thread should i just swap for a 94 computer and harness if im going to keep the M6 trans with the 96 motor....from what i read i just have to get a obd 1 knock sensor and of course a few wiring gremlins....is there any problems with the under dash wiring having to get changed for anything....i plan on doing this in the next week or two so im really hoping someone can help me out before i start

TBSPW

bump....need help asap project starts next week

shoebox

You can look here to see what the major difference between years are.

TBSPW

so looking at that ill have to cut the harness up a little to make things match from the 96 to the 93 body....doesnt seem too hard...correct me if im wrong but it only looks like a few wires need to be changed....but some things like cavity D on the 93 harness doesnt even exist on the 96....do i just leave it blank when splicing the harness?