I have a built LSV running pro 1's. I have a skunk2 pro series intake manifold. Is there a benefit with having a larger throttle body. LIke a 70mm over a 68mm? I figure bigger is better..more air=more power. But are there cons to having a 70mm over a 68mm?

 

Whats your compression ratio? a 70mm could be too big in some cases.

I plan on running 68mm on 2.3L 12.5:1 CR.

 

I just ordered a 70mm to replace my 68mm on a 11.8cr, so I am wondering as well.

 

I agree, going too big might be more harm then good.

 

Its just over 12.5:1. Ive talked to king motorsports and they suggested a 68mm so Thats what Ill prolly go with. It has to be better then the stock gsr one. HA! But I would like more explination on why well...if someone uses the more air is better theory...why not getting the larger throttle body is always better? I have heard several things but I'd like a better explianation

 

The engine dictates airflow, not the throttle body diameter. If nothing else is changed, a larger diameter will make the throttle more sensitive, and maximum flow will be reached earlier. In this case, any pedal travel after this point is useless.