What constitutes needing a bigger TB?
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TECH Resident
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Joined: Mar 2002
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From: Wilkes-Barre/Kingston PA
What constitutes needing a bigger TB? I've been debating this for a while, and can't seem to come to the conclusion as to whether or not I need a larger TB. My mods are in my sig, would I benefit?
Teching In
Joined: Oct 2007
Posts: 44
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From: Newark, DE
i think it would defently help the question is are you gonna use f/i? for the way your car is a 52mm should gain some hp, if you want f/i later on then get the 58 now, cause you will still see a hp gain.
TECH Junkie
Joined: Dec 2005
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I would base it on your KPA at wide open throttle. If you are right around 100kpa at wide open throttle and rpm then everything is fine. If you are at say 93kpa then you are leaving horsepower on the table.
Then you need to find out why. Is the restriction the airfilter? Is it the size of the cold air intake? Maybe the throttle body is to small.
Then you need to find out why. Is the restriction the airfilter? Is it the size of the cold air intake? Maybe the throttle body is to small.
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TECH Junkie
Joined: Dec 2005
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Likes: 11
It is a measurement of atmospheric pressure. 100kpa is standard at 29.92psi. At idle say depending on the motor the plenum might be at 50kpa. So if your plenum is around 100KPA at wide open throttle that is the best you can do.
At wide open throttle you want the plenum to be as close to atmospheric pressure as possible in a naturally asperated motor.
At wide open throttle you want the plenum to be as close to atmospheric pressure as possible in a naturally asperated motor.
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