Hey what's up guys, im pretty new to the corvette world I have a 1991 and I would like to do heads, cam and intake also exhaust I was wondering if I should ditch the TPI system and also was wondering what im going to be spending I mean with all that I'd be hoping for at least high to mid 300hp

 

Ditch as in replace with a carb? Erm no.

 

Oh lord no, ditch as in just normal efi

 

Hi

Yes replace the TPI inlet manifold and go to a mini ram inlet manifold if you want to fit a hot cam, however there are also plenty of fast TPI corvettes.

I would recommend fitting long tube headers and an adjustable fuel pressure regulator, set the fuel pressure to 45-55 psi and adjust the TPS (throttle position sensor from 0.54 volts dc to 0.6 volts)

That will really make the original TPI engine go, it al depends on how fast you want to go? second quicker over the quarter mile can be done easily as described earlier.

The TPI can get you into high 12 sec quarters with a lingenfelter tpi cam, headers cold air intake and adjustable fuel pressure regulator.

If you want to go faster with a hot cam heads and intake remember the standard auto transmission and diff wont cope.

It gets expensive so if the car runs good try long tube headers first.

 

12 second qutor mile time sounds good to me just want something simple fast and fun

 

Superram also comes to mind if he doesn't want to change the distributor and cut a hole in the hood for a HSR.

LT hearders I can see but not sure if adjusting the TPS helps since the ECM considers the voltage at startup to be idle. Also, IDK if changing the fuel pressure helps that much. Under closed loop, the ECM would simply adjust accordingly till it runs out of "window". So at WOT, it might work but I'm not sure since I don't get into coding the program. Maybe intakes and headers and have the ECM program redone on a dyno and change it where it needs to?

Which LPE cam? The 74219 or the 74211? I had the LPE Superram and Headers which benefitted from tuning by LPE. I used the 74219 cam and definitely needed tuning to make it work well. Just sticking it in doesn't maximize it. If he wants to do just intake, headers and cam, maybe he can do it without trying to fool the ECM but by doing a dyno tune so it is optimized? Should be close to his 300HP mark without trying to screw with the fuel pressure since the pulse width will be adjusted properly. I would say that at this point, he should have the injectors tested and cleaned since we wouldn't want it to run lean.

D36, if it is auto might be ok with a hotter cam and intakes and headers but sooner or later, the trans will wear out. I would think that the D36 will hold up to that if he doesn't beat on it several times a day, 365 days a year?

I did try the LPE intakes and headers but it still needed tuning to get all you can out of it. LPE made the Tri-Y for the F-body but when you stomped on it, my 91 seemed like it took a bit before it caught on to the program without the tune. After the tune, it seemed to be right there when you mashed the throttle.

 

A TPI or better yet a high flow TPI intake will work fine if you put your package together to extract the potential out of it.

I like my high flow TPI set up better than my LT4.