1990 corvette tuning help
Thread Starter
Cruising
Joined: Jan 2021
Posts: 13
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1990 corvette tuning help
Alright so I'm trying to tune my 90 corvette, and need some advice. It was modified into a 383 stroker and i dont know if it was ever tuned correctly for it. I bought it modified, and now I'm having to rebuild it. It never ran quite right for the year that I've had it. I want to get it tuned to make sure that it is running correctly, but in order to tune these computers (from what i know) you have to have a pre-programmed ROM chip burned on. Im asking for some advice on this to know whether i should go with an aftermarket computer, find a shop that can program a ROM chip(correct me if I'm wrong on the name), or even maybe use a newer gen corvettes computer as a replacement to make sure the rest of the electronics on the car work. I've also seen cars with dual computer systems. Just looking for some people with experience to help me out here.
Drifting
Joined: Feb 2016
Posts: 1,384
Likes: 339
From: Simi Valley CA
I found this site from this forum. I know it says LT1 tuning, but they offer TPI tuning on the site too. It gives lots of info on what to buy to tune it yourself, or you can send off to the guy that runs this site.
www.lt1pcmtuning.com
www.lt1pcmtuning.com
Team Owner
Joined: Sep 2001
Posts: 62,142
Likes: 1,729
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Is the motor in the car and running right now? What are the specs on the camshaft, what intake, headers, heads, etc. What size injectors? Your tuner will ask all that.
You have a PROM chip inside the ECM, that needs to have the timing and fuel tables updated with the right software, that is the gist of what is changed.
There is no need to go with an aftermarket piggyback tuning setup, unless its just a wild combo, or you want to spend that much money.
You have a PROM chip inside the ECM, that needs to have the timing and fuel tables updated with the right software, that is the gist of what is changed.
There is no need to go with an aftermarket piggyback tuning setup, unless its just a wild combo, or you want to spend that much money.
Team Owner
Joined: Sep 2003
Posts: 25,383
Likes: 2,736
A '90 should have a 1227727 ECM if the original is/was retained. You could invert the ECM, remove the cover and see what's inside for a PROM. If there's information inked by a 'tuner' or whatever on the PROM. It could even have already been 'tuned' using a piggyback affair. You'll need to look. If you had an appropriate scanner you could maybe scan it and see how the PROM is ID'd maybe.
ID first by visual inspection of what's in the ECM I believe is an appropriate 1st step.
ID first by visual inspection of what's in the ECM I believe is an appropriate 1st step.
