alright guys.......some ppl have been telling me that i can get 400 HP with a TBI car, is this true? What i wanted to do was put a 350 with AFR 190s, comp cam(not TOTALLY sure about specs yet), 454 TBI with #90 injectors, and an Edelbrock TBI intake bored to fit 454. with the right cam i wanted to try and get 400HP. But there are ppl saying no way.....i just want to hear what u guys think or if there is a way to get more HP out of TBI?

 

not with that intake. Ports are too small. go Victor Jr.

 

i live in CA, so i need to pass emmissions. know any other Emmissions legal intakes other than Edelbrock TBI intake? or can i like bore out the ports or anything!?!?!?!?!

 

An intake swap every 2 years isn't a big deal. We're in the same boat.

 

Yeah, California laws we need to watch. We never get to have any fun =P

 

blah blah, it's all about HOW you do it. I'm sure you can get your car to pass if I could get mine pass the same sniff test (on a dyno etc) without EGR, without AIR pump. The onlything I would have had trouble with was the visual inspection. They never like the chrome and bright intake manifolds but I was lucky. The guy looked at it, shook his head and said if it passed the sniff test he didn't want to see me for another 2 years!
A local shop would have done the same thing so long as you could pass the sniff test which you should with EGR and a working cat.
400hp with TBI and a 350 isn't exactly easy but neither is swapping to speed density TPI for the same reasons. Big injectirs, big intake, big throttle body and a custom eprom. You get that and you'll make more hp than TPI (stock plenum, throttle body, runners, base, etc) BUT you might loose low end torque. The idea of a 2 ton car needing HUGE amounts of low end torque is overrated. Give me hp over torque with ANY v8. Just don't give me a 4 banger and tell me you want torque!
Back on subject, TPI is going to cost you WAY more for 400hp depending on what cam you go with. If you do everything right and spend the $$$ on TPI intake parts you can probably do the 400hp with a smaller cam than you would with a TBI system. The idea is that you'd be more likely to pass the emissions with a smaller cam than a larger one (duh). Whatever you do, keep the roller cam setup and don't go with anything less than 112 lob sep. If you do, don't expect to make 400hp smog friendly.
There are always exceptions but if you had to make the 400hp and pass sniff sniff then my combo would be a 355, AFR 190cc heads, holley intake manifold, slp headers, and a cam with a little more lift and duration than the Lt4 cam. The Hot cam would definatly make you well over 400hp, probably near 450 but it's hard to say if it would fail or pass. Use desktop dyno to do your work and remember, to make gobs of hp AND pass emissions testing, you will almost always need to keep EGR functional and run cats. It'll also help if you retain the AIR pump and just route it to the cat(s) in pipe to help burnoff any extra hydrocarbons. EGR will help keep the nitrous oxide fumes at a min and the rest is up to good tuning. Good luck and whatever path you choose (TPI or TBI), make certain you get a CUSTOM eprom burned. In other words, expect to pay an extra $300 or more depending on if you get a custom eprom or do em yourself.

 

damn never even thought of that.....changing intake every 2 years is not bad at all. So which intake would giveme my 400 horses but still have EGR. Also when i do have to smog it would i just put in my stock 305 manifold?

 

If you insist on keeping the EGR, the 7525 weiand is for you. Its a bigger single plane than the 7547 I have, but smaller than the Victor Jr. And it has EGR for about $200

 

you think that, AFR heads, 454 tbi with 90 injectors, and a good cam would put me at 400HP

 

prolly, you could do fast burn or trick flow heads for cheaper. adn they will both flow as well teh afr's.


later
tim