Will a bigger diameter throttle body improve more whp or tq? I have only basic bolts on such as i/h. Soon exhaust. Later cams, shafts, etc. Going all motor. Can anyone give me some input please.

 

The amount of air that is going through the TB may be slightly (and that is...only slightly) bigger than before, but it all comes down to the same intake manifold. Unless you bore the inside of the manifold, and remove some material from inside of it, i doubt you would gain 1hp from it.....

What is the motor on your accord 2003???

 

k24a4 going all motor

 

There is a variety of aftermarket parts of k24's already. I have a F22, which i'm building all motor as well.
I did some bolt-ons in the past, i was happy with the results.
From everything i had, the best stuff i had was: all aluminum pulleys, 8lb alluminum flywheels and stage 3 clutch. The car would rev up quickly, and just felt like it had lost a lot of weight.... was much quicker than before, great response from only such mods.
What kind of purpose do you plan on building your engine for? Daily driving? Track... both?
Also... what numbers do you wish to lay to the wheels???

 

I am doing daily driven, no track car but i want the extra power. willing to fork over $ but only for all motor setup. no fi / turbo. thanks for the input

 

don't waste your money, i've seen people put larger diameter TB's on and lose hp. the only way you're going to get extra power out of TB is high-flow intake manifold and throw some boost in the mix