This is my 2nd time upgrading my throttlebody. Before this, it was before the quads and now this again. The best way to get it done is to either get a 2nd hand unit which has been bored completely or trade it with someone else. If you cant find any, you have to wait for the machining work process to be done for the boring, change of flap and installation (couple of days maybe?). Upgrading the throttlebody do require some minor calibration with your sensors and maybe your piggyback since there a bit more air coming in now and better response.
- Stock TB : 60mm Outer, 56mm Inner
- Modified TB : 63mm Outer, 59mm Inner
- Plenum size : 56mm
My throttlebody has been tapered down from 63mm to 59mm and the only thing that wasnt done (due to lack of time) was the port-matching to the plenum inlet. Maybe when i have the time next time.
The cost for this upgrade is cheap since i dont have to search for another TB and also trading is an effective way instead of having a tough time selling your stock version.
This modification will help increase my throttle response and i do not expect some power burst on the dyno with this setup. Maybe a little. I know some people have this idea that TB ugrades will make their car go faster. Leaner is definitely faster but not power bursting. Make sure the machine work is done properly and the butterfly flap has been changed to the appropriate size. Air velocity speed and turbulance is something to think about when it comes to sizing of your intake, plenum and length.
So if you have a choice of changing throttlebody which is better than mine, buying from the aftermarkets, by all means please do so. I would love to have a set of 80mm Hypertune TB with its custom intake, ha ha.
Good Reading About Intake Runners : http://auto.howstuffworks.com/question517.htm
