i went to a junkyard about a week ago looking for a tpi setup and the guy told me that he had one on an 89 or 90 iroc-z. my question is would a 90 tpi setup work on my car (89 tbi)? i'm only asking b/c i know at some point they switched over to speed density, but i'm not sure when. and if it is speed density how hard would it be to switch over to that? i just hope to g0d that it's an 89 cuz that would be perfect. and also is $250 a good deal for it? thanks alot for any help.

 

Well, it shouldn't really matter which year, since you need to swap basically EVERYTHING over to make it work- manifold setup, wiring harness, computer, fuel pump? (not sure about that one), etc.

Not something that you can just get the manifolds and throw them on...

 

well of course i knew that you'd need to change the manifolds, ecm, wiring harness, etc. but i've heard ppl saying how you should really try to stick to the same year car as yours is. also what are the advantages and disadvantages to maf, map?(if 3rd gens have this), and speed density? thanks again.

 

Sorry, wasn't sure if you knew what you were getting into

Anyway, MAP is speed-density. There are advantages to both types, but since you will be changing everything that has to do with the induction, it doesn't really matter which you use, so long as you get everything from the same donor car.

MAF systems have the ability to adapt to mods, since the amount of intake air is directly sampled.

MAP systems have a higher discrimination, meaning they can be "fine tuned" more accurately, but that is slightly more work.

Either system works.

 

ok well thanks alot for clearing that up for me now all i have to do is to find out whether that iroc is a 89 or 90... and he never said if it were a 305 or 350, i'm assuming a 305 since i told him about what my car has and then asked about tpi... although if it were a 350 then i would scrap the tpi swap and just get the whole engine if it ran good.