I have a 1995 Chevy 1500 reg cab short bed with a TBI 350 with hooker supercomps, and true dual exhaust. I dont really count the K&N top mounted Hot Air intake as my import friends like to call it, but that was before i realized that go was ALOT more important than Show. Not too long ago I had my heads ported and polished and had bigger valves cut. Afterwards i noticed that i was bogging pretty bad off the line, but pulling real hard after about 2000rpms. I had a 3.08 rear with an open diff, so i swapped that out for a 3.73 with an Eaton Posi and I am LOVIN IT! I can launch it from almost 2 grand and it hooks fine (as long as the street is clean, Haven't been to the track yet) and pulls like its goin out of style until about 4000 rpms, where it just seems to lose power until it hits 4500 and shifts and get me back down into the good power. I dont spend much time above 4000 but its enough to be annoying. I raced an accord last night, little farty thing and i jumped about a car and a half on her until i hit 4000 and then her acceleration matched mine until my auto shifted at 4500 and i started to pull hard again, and after i get out of first i dont really have the problem anymore. I'm thinking that I might have an airflow problem now... as in not enuf. I came about this theory because since the TBI (that is my problem that TBI crap) anyway that TBI manifold is dual plane (of course) and that means that each time one of those 2.02 inch intake valves open they have to pull 87.5 cu in. of air through a 1 11/16 inch (i believe it is) hole in one side of the throttle body. I may be way off here, but could this be the culprit? And if so is it worth it to get a bigger TBI and have the manifold ported or buy an edelbrock? Or should i ditch the ghetto-jection and cough up $1-2000 for some real MPFI from Edelbrock or do up a nice TPI system.
Thanks,
Chase