3" intercooler piping too big?

[Ed98GST]

I also have a question about using 3" piping, but it's a little different. Should still be relevant to the original poster's question, though.

Has anyone considered (or somehow measured) the effect that 2.5" piping has when used in conjunction with the GM MAF in blow through? You're going 2.5<3>2.5>2.34 -- that's gotta create some nasty turbulence. My question is whether that turbulence is significant enough to warrant using 3" piping from the FMIC to the TB. As far as the air slamming into the TB if using the 3" piping, you can always use some sort of reducer hose, pipe, etc. to neck it down to fit precisely...2.5<3>2.34 seems like it would be MUCH better for flow, velocity, etc. Anyone have info/experience with this? I know that 2.5" will work just fine (i.e. - it's been proven many times and many people with high hp applications run this way), but if 3" would be better for the airflow, then why not go for it?

 

[Scrymerr]

I go 12.1@115mph with a 2.25" upper intercooler pipe, what the hell would you want 3" for? You got a hemi in that thing? I'm considering going to 2.5" but only because I may go with a maf translator and nobody makes 2.25 - 3" maf piping upgrade.

I think there is a reason there is no 2.25 - 3" GM MAF pipe. A friend of mine used two silicone reducers in order to install a 3" GM MAF into his stock 1g UICP. The MAF setup did not seem to function properly because the air went from such a small tube, and then the reducer opened it up too fast going through the MAF, and probly created a lot of turbulance. The GM MAF blowthru pipe I have from dejontool is 2.5" and then expands gradually to 3" to accept the GM MAF and then back down to 2.5" and into the TB.

 

[Ed98GST]

Anyone have any additional thoughts on this?