89 firebird 5.7 tpi
Thread Starter
Racer
Joined: Feb 2019
Posts: 397
Likes: 29
From: Jackson, mi
89 firebird 5.7 tpi
what is the difference of the 89 firebird tpi engine compared to a 91 vette i know the aluminum heads are not of the firebird 5.7 but other than that what are the difference, i can get a complete engine and 4l60e trans for 300 bucks with all of the tuned port injection stuff
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
what is the difference of the 89 firebird tpi engine compared to a 91 vette i know the aluminum heads are not of the firebird 5.7 but other than that what are the difference, i can get a complete engine and 4l60e trans for 300 bucks with all of the tuned port injection stuff
buy it now!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Intermediate
Joined: Apr 2014
Posts: 40
Likes: 0
From: Phoenix AZ
Firebird tpi
The big difference is the egr setup. Corvette is external. Gen 3 tpi's are internal in the intake manifold. Probably easier to swap your intake setup.
Last edited by ekistler1971; Mar 28, 2019 at 05:28 PM.
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Camaro/Firebird had different intake plumbing to the filter. I never heard of them having a different manifold nor noticed a difference after owning both.
Also never remember seeing a published hp difference between comparably equipped cars.
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
Drifting
Joined: Jun 2018
Posts: 1,678
Likes: 229
From: Michigan
I don't remember where I read this. Maybe they made it up. But I didn't. I distinctly recall reading this somewhere. Around the year 2000 I helped a guy do a 87 Firebird TPI into a 58 Bel Air wagon. I did the swap, engineering, fuel system, wiring, etc. I remember that at a later date I read that the Firebird engine wasn't as strong as the Camaro engine, it was rated less, and that the plenum / hood line was the reason. I remember thinking "too bad we used a Firebird. We didn't know this at the time". The guy ended up selling the car only a few months after I finished it for him.
I would say there were no differences in the cast manifold or runners. I can't "prove" this, but your post was the first I ever heard of anything being different about the manifolds.
I can also confirm the external EGR and slightly different ECM mapping due to aluminum heads when comparing to the corvette.
