akertulis

what do ya think?

MrHeeltoe

iTrader: (1)

Probably not needed. Larger throttle bodies are great for supporting bigger intake manifolds...but with a stock manifold I don't see how the stock TB is inagequate. I could be wrong though.

n3o

iTrader: (2)

^ or for boost.

akertulis

yea i have an aem cai and i didnt know if it would allow more air flow alng with the spacer

akertulis

also is there an upgrade intake manifold avail for this car

AtlM5

I'm not sure about the size of it but i wonder about the 09 sh-awd...its supposed to be lighter and hold less heat because it is plastic...

I hate cars

Boost requires less of the TB. I touched the high 10s (around 500whp) with my stock 58mm TB which is much smaller than the TL's stock TB.

To the others, unless there's a large bottleneck which is extremely unlikely on a modern car, you have to think of the system as a whole, not just one item. Just a larger TB is going to do nothing. But if you free up the entire intake tract from the filter to the combustion chamber it might give you a little.

It costs the manufacturer nothing to size the TB for max power so you can bet it flows more air than the engine can use at full throttle. CAI really doesn't flow more air, it just delivers cooler air.

What the larger TB will do is give you more power for the amount of throttle you give it. At some point, probably around 75% throttle or so, you will gain no more power and full throttle will be the same as stock.

MrHeeltoe

iTrader: (1)

Boost won't make a difference what throttle-body you have until you get into the upper echelons of tuning. Pressure takes precedence over flow here.