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How can I tell if my throttle body is to small?
Posted: Sat Mar 24, 2012 7:27 am
by bmcewen
I believe that I read somewhere that if you can hit the same MAP reading at full throttle that you have at Idle than your throttle body is not restictive. Is that true? What readings would be effected by throttle body sizing? FYI I am not looking for someone to tell me wether or not they believe that my throttle body is sized correctly.
Re: How can I tell if my throttle body is to small?
Posted: Sat Mar 24, 2012 8:02 am
by Bernard Fife
bmcewen,
Ideally, for a NA engine your MAP reading at WOT will be the same as the baro reading at start-up. That indicates no restriction at all.
However, as long as the MAP doesn't decrease significantly (more than a couple of kPa or so) with the throttle wide open as you approach the RPM at which peak horsepower is made, you are good.
The MAP at idle doesn't come into it.
Lance.
Re: How can I tell if my throttle body is to small?
Posted: Sat Mar 24, 2012 6:04 pm
by bmcewen
Yeah, I didn't mean to say idle. The reason I ask is I was expecting my stock 48mm throttle body off of a 94 camaro to be restrictive. Are the HP and torque numbers calculated by Mega logger wheel horsepower and torque?