Rev Happy is correct, unless your heavy modded with a short runner intake then the stock TB will flow WAY MORE air then you can use. If you do get to the point to where you "need" a TB then I suggest either a BilletFlow or an AccuFab single blade and either one will provide about a 5-7 RWHP increase in power on a N/A DOHC car.
First: I'm a total gear head - Meaning I can't leave anything alone for long.
Second: Two Saturdays ago I was suffering from serious car boredom.
So, I took my spare TB, and re-worked it with my die grinder using sanding rolls.
I re-shaped the air entry to roll smoothly into the throttle blades. I re-worked the divider slightly as it transitions into he bores.
While I was there, I drilled out the steel inserts in my TPS sensor and set voltage to .98 volts.
I dynoed with these mods last Friday, and I'm happy with the final combined results: 7 hp and 11 ft/lb for 2 hours work. I'm now at 269 hp and 284 ft/lb at the wheels. All testing was done on the same dyno, and all runs were SAE corrected.
I do agree the factory TB flows a lot of air, but there is always room for improvement. I will do a back to back dyno later this week stock vs. modified as I have both, and post exact results here.
If anyone wants to see pics of the modified TB and/or dyno graphs, let me know so I can post them.
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