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Discussion Starter · #1 ·
hi
i have my car with a 306, stock heads ported, stock intake ported, 30pound inyectors, 75mm maff, 274HR cam. the problem is that i tried a lager TB 65mm with spacer and my car ran lot slower why? i had to put back the stock one again! lot of people i called told me to change the intake and put 70mm TB but i dont whant to spend my money and probaly my car is going to be worst!!!!
what should i do and why my car ran slower with more air i think it was going to be better because i have big inyectors.:sosad::worship:happyhapp:rolleyes:
 

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i have a book that dynos several popular 5.0L mods, and throttle bodies are the biggest pretender out there. On a 400 hp beast, a 65mm throttle body only gained like 3 hp over stock, a 70 was about the same as stock, and a 75mm actually made less power. I wouldnt waste my time on throttle bodies.
 

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Discussion Starter · #3 ·
i bought a RPMII and 70mm TB for very cheap price 300$ all. what happens if i put it with my combination?
i plan for a 347 but not now like for february!
can i got on 12' s with my 306? what do i have to do?
 

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You got to bottle feed it...:)
 

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Get rid of those 30lb injectors and go with 19lb.
 

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You don't have enough motor for 30lb injectors. You can go back with 19lb injectors and the larger throttle body and you will pick up some speed at WOT.
 
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