1998civicsi

hey guys what is a throttle body and what is its purpose...liek i always hear about guys with dseries engines sohc v-tec put in b-series throttle body! does that help or anything...i have a 98 civic coupe si..would that be something i would want to do for performance gains??????

zeeman

iTrader: (1)

a throttle body let air into the engine via the intake manifold. Its pretty much just a round cylinder with a butterfly (plate) inside that opens and closes as you press the gas pedal....there is a cable (the throttle cable) that attaches to the throttle body butterfly from the gas pedal. There are also a few sensors on the throttle body....the Throttle Position Sensor (tells the ecu how much gas you are giving it), and possibly a Manifold Absolute Pressure sensor, some of the older t/b's just have a vacuum nipple for a vacuum line that goes to the MAP located on the firewall.
Yes a b-series throttle body is a good, cheap upgrade. Get a 2nd gen b16, b18c1 or b18b t/b as they are all 60mm and relatively easy to come across. However, you will need to port match the t/b to the intake manifold plenumn opening....the stock opening will accomodate a 56mm t/b, you just need to open it up to 60mm. Unfortunately, the intake manifold needs to come off the engine to do this, i mean i guess you could just shove a rag into the intake manifold and HOPE metal shavings don't go inside your engine, or do it the safe way and take the manifold off and clean it out afterwards.

LEITNER

have fun with a 6mm bigger throttle body on a stock engine. dont be silly doing that mod. you lose all you bottom end and mid range power.