larger throttle body?

[Jaws]

The r33 top end I purchased did not come with a throttle body.

How big are standard?, has anyone seen larger throttle bodies for r33's?.

[25GTT]

Doesnt the XF throttle body make a good throttle body when upgrading plenum aswell? not sure about standard sizes but XF throttle body seems to be a bit of a common upgrade....

[JimX]

Bigger throttle bodies are not really necessary unless you're cranking out stupid amounts of power, because the turbo forces the air through. It used to be with carb-fed NA cars, you increase the "suck" efficiency by increasing the diameter of the items in question. That would mean a carb with bigger or more throttle bodies, and also a bigger diameter fuel line.

But with turbos and pressurised fuel lines, the size of them became less important. Put it this way - You can squirt much more fuel through a 1/4" fuel line with a fuel pump than a carb'd engine could ever suck down a 5/8" fuel line.

The same theory applies to your throttle body. Of course there is going to be a limit where you can't force any more air through and you need a bigger one, but that's probably not until you reach well over 250rwkw. If you go bigger before then, all you'll do is introduce more lag.