90 tsi parts in 91?

[Colt90tsi]

I am buying a 91 awd shell, I have a 90 awd that I am going to be swapping parts out of to my new 91, I am going to be taking my engine, tranny, and drive shaft over to the 91. Are there gonna be any fitment issues or anything else I need to know about?

thanks!

 

[Lofty]

No problems with tranny, they're both the same W5M33 for standard transmissions, everything else, I'm not sure.

 

[fwdmaster]

Get a 91 (CAS) aka cam angle sensor

 

[awd6boltsi]

Get a 91 (CAS) aka cam angle sensor

Why do you say get a 91 cas instead of using his 90?

 

[Stainbox12]

He won´t be able to use a 91 CAS, if the engine harness is 90. I did a swap, from 90 to 91, and i had to buy TPS, throttle body (90 and 91 are different), Engine harness, Coil, power transistor, and a few other things, like splicing the inside harness which was a pain to do. If you will use your 90 harness, you need to take apart even the harness inside the 90 car, because 90 and 91 don´t work together unless you do some splicing. The swap actually involves some more than what is known in this forums. You actually need to swap 2 pins as well depending on what ecu and what harness you are using. Also, 91 shift cables might not work with the 90 tranny, but i could be wrong, do some searching. Swapping things from a 90 to a 91 is a pain to do, since they changed a lot between those years. Keep in mind also that a 90 had air oil coolers, and the 91-94 are actually water cooled. Gauge clusters from 90 to 91 changed as well, since 90 used noise filters to send the rpm signal, and 91-94 were built into the coilpack. Im sure im missing something else, but i don´t remember right now. Are you ready for some real harness trouble?

 

[Colt90tsi]

damn....

the 91 still has the harness in it. All it needs is the block+head. I should only run into problems if I take the 90 harness to the 91, correct? Besides the tranny cables.

 

[fwdmaster]

Why do you say get a 91 cas instead of using his 90?

Cause the 91 harness has a plug for the cas while his 90 cas doesent

 

[Stainbox12]

damn....

the 91 still has the harness in it. All it needs is the block+head. I should only run into problems if I take the 90 harness to the 91, correct? Besides the tranny cables.

Thats right. If you have a 91 engine harness, all the sensors, and a 91 gauge cluster you should be good to go. Otherwise, get ready to splice wires inside the 91 car and replace the gauge cluster for a 90 if you are using a 90 harness and sensors. The tricky part is to determine which wire powers or makes a certain part of the car work. The 91 wire harness inside the car behind the console has less cables and plugs are different to match a 90 engine harness, so thats why you may encounter some problems. Im pretty sure that with some patience you will find out. Honestly, if you want my advice, get a 91 harness along with the sensors. If you said that the 91 has still the engine harness, then get a coil, a tps, a 91 throttle body, and a power transistor, assuming you still have the 91 cluster inside.

 

[Stainbox12]

Cause the 91 harness has a plug for the cas while his 90 cas doesent

You can´t make it work unless you fab an adapter. The 90 cas has a long wire along with a squared plug. In theory it should work, but its not worth the hacking when you can actually find a 91-94 CAS cheap enough to make it work like its supposed to be.

 

[steve]

Don't use the 90 sensors. If you have a good 91+ harness use it so you don't get stuck down the board trying to find the unique 90 parts.

You want to change the throttle body to a 91+, that will get rid of the TPS and ISC but require you to get a 91+ fuel rail. Use the 91+ CAS so you don't have the old brittle wires hanging out of it instead of the connector. change the coil and power transistor to the 91+. I think the rest of the sensors are the same but I haven't finished my first cup of coffee yet.

Use the 90 air to oil cooler. It doesn't back off like the 91+ water to oil cooler and dump your oil on the ground.

 

[rock1t]

well foohey.. what about rear ends and such? axles and chassis? cause i am getting ready to buy a 90 eclipse gsx and i have a 91 tsi