Throttle body optimization on 2.5L?

[3i2011]

Disclaimer: I have no f***ing clue what I'm about to talk about so take it with a grain of salt

Intake isnt bigger, it can just allow more air to flow through? I guess porting the throttle body throws off the maf because its a bigger diameter opening so the same amount of air comes through slower compared to stock? Maybe? So the maf reads its getting less air than it actually is? Sort of like a 1 gallon per minute pipe with a diameter of 1 foot. Open it to 2 feet, to get the same 1 gallon per minute, the water is going to move slower. Someone who knows whats going on, am I on the right track?

[Crespo]

Originally Posted by 3i2011

Disclaimer: I have no f***ing clue what I'm about to talk about so take it with a grain of salt

Intake isnt bigger, it can just allow more air to flow through? I guess porting the throttle body throws off the maf because its a bigger diameter opening so the same amount of air comes through slower compared to stock? Maybe? So the maf reads its getting less air than it actually is? Sort of like a 1 gallon per minute pipe with a diameter of 1 foot. Open it to 2 feet, to get the same 1 gallon per minute, the water is going to move slower. Someone who knows whats going on, am I on the right track?

Sort of. You are talking about volumetric flowrate. To keep the same flowrate, the velocity decreases as the diameter gets bigger or the velocity increases as the diameter decreases. (pVA)1 = (pVA)2. p=density of air, V=velocity of air, A=area of opening.

[3i2011]

Originally Posted by Crespo

Sort of. You are talking about volumetric flowrate. To keep the same flowrate, the velocity decreases as the diameter gets bigger or the velocity increases as the diameter decreases. (pVA)1 = (pVA)2. p=density of air, V=velocity of air, A=area of opening.

That's basically what I meant in my head. I was just struggin to get it out lol

[jmaister]

Originally Posted by 3i2011

Disclaimer: I have no f***ing clue what I'm about to talk about so take it with a grain of salt

Intake isnt bigger, it can just allow more air to flow through? I guess porting the throttle body throws off the maf because its a bigger diameter opening so the same amount of air comes through slower compared to stock? Maybe? So the maf reads its getting less air than it actually is? Sort of like a 1 gallon per minute pipe with a diameter of 1 foot. Open it to 2 feet, to get the same 1 gallon per minute, the water is going to move slower. Someone who knows whats going on, am I on the right track?

Thats pretty much the idea. Any intake that hasnt been tested or calibrated will give you the cel due to the same reason.

Bigger intake will work, but lots of tweaking is involved.

[jackf]

I did this a few months back when still had the godspeed manifold on my car. I ran in to all sorts of idle issues. Coming to a stop at a red light it would sometimes surge to 2000 rpm hold and then fall back down only after bliping the throttle. I had a few people think I was trying to race them. The plate movement had no binding... totally free movement. I was possibly a little too aggressive with the porting in regards to how close I brought it to the plates sealing surface and I did thin the throttle plate a bit too.

I was reading low G/s with the LM2 at idle with a CEL (1-2 g/s) but at full throttle peak reading at redline was 135g/s(I'm at 5600ft above sea level ) up from 128 and that was consistent across a few logs same day same road all with in a hour or so. I can't say whether more air was actually getting in or the MAF reading was just getting skewed because it was not tested on a dyno.