Hi the car is a 90 rs. It orginaly had a 305 tbi but it shorted out.

THe entire wireloom was replace and a cpu was replaced with a iroc tuned port. It does have a Mas on it?

I am looking to see if I turbo charge this one or if the cpu doesnt have a map I just go the 383 stroker route.
Could you all help me out.
Thank you,
Shane

 

You could have any number of ECM's. A '90 TBI would have had the '8746, a '90-'92 TPI would have a '730. But it could have been replaced with a '86 - '89 TPI ECM '165.

Was the injection system replaced at the same time the wireloom was replaced?

Best bet is to pull the ECM down and post the service number from it here. The ECM is located under the dash on the passenger side. Silver box about 10 x 7 x 2", lots of wires going to it. Don't need to disconnect the wires, just pull it down enough to get the number off of it.

RBob.

 

165!

Thanks.