I just put in a GT40 intake on a 1992 GT 5spd w/equal shorty headers, H-pipe, 70mm Maf,24lb injectors, 65mm TB., 373's. What's the vaccum reading at intake suppose to be? Also what should be the fuel pressure.Thanks.....

 

the vaccum reading at intake??? and suppose to the fuel pressure, do you have an aftermarket fuel pressure regulator that you can adjust??

 

Correct whats the vaccum at intake suppose to be ? I have an adjustable fuel pressure regulator also, ......help!!!!!,thanks............

 

im still not getting the vaccum question?? but for the fuel pressure, what regulator do you have, and what is the stock setting that it comes with... also what size injectors do you have?? the bigger injector you go you will want more fuel to feed them at high rpm.. depending on the size of the injector depends on the size of the injector let me know

 

Ok,the most recent install was 24#injectors, 70mm Maf calibrated for 24# injectors,along with the GT 40 intake,Holly fuel regulator at 39lbs. Timing set at 16'dgs. why is it not running smooth.Thanks again.

 

what does it do when it doesn't run smooth?? rough idle??? the first thing i would do is check the vaccum lines to the new intake manifold, because i know when i put mine on it ran really bad and it was because i had a vaccum line hooked up in the wrong spot.. then if that is not the problem i would set the timing back to stock unless you have a cam?? because i never had to touch my timing after i did all that work and if it still isn't right i would up the fuel pressure a lil bit probably to around 40-45 at most... let me know how it works out, also you might want to take some brake clean turn your car on and spray the brake clean on the vaccum lines and if the idle starts to jump or act up you have a vaccum leak and that can cause the car not to run right... let me know

 

Not running smooth meaning when I step on it (not in gear) varrrrrr....mmm, it doesn't follow thru smooth varrrrrrrooooommmm. Don't know how to explain.... The car is in the middle of a 3G Alt. install that my son who is doing the electrical has'nt finished.So presently I can't even start the car to do any checks until my son finishes the Alt. hookup. But once thats done I'll bump up the fuel pressure,I'll let you know,I'll answer on this thread, I appreciate the advice.Thanks.