How much will different sized intercooler piping flow?

[v8s_are_slow]

I'm not trying to be an ass and sorry if I offended you. I'll stop cause I don't want this to turn into a flame war. Yeah, get your i/c piping as close as you can to "your" setup. That's all I'll say. Sure everyone can figure it out from there. Have a nice day.

 

[gstryyder]

Funny how I come back to this thread after a few years only to see the ignorance of the simple minded in the last few posts... Had a serious back injury and had to stop everything. Can't wait to get back into DSM again and put brains into the power and performance. I have proven time n time again all kinds of variables for all kinds of setups and what not... I have a platform I have been mind effing. For a while that will male a raging street machine like people haven't seen. Funny my best friend is a sub I guy with a big fat turbo 3 inch pipes and 400hp. And his car is a freakin dog.. And once he hits boost finally has to shift.. Lmao.. I'm gonna build a mean machine and when i t comes around I will be sure to put up a build thread with info as to why and what I did to the T. So people can stop this horsing around with their cars and get real raw power NOW. HOPE this thread still helps ppl to this day. I still see real world results all the time off my work and **theories** so its called. Granted I know it works... I'm not just talking about pipe sizes either.. I save the goodies for my own shizznit. More to come. Sorry I was gone so long. Hard to get around these days and put DSM and badazz modifying on the back burner for a while...

PS... Most dsm'ers are good at 2.25" piping granted 2.5 is what most will run. 2.5 will be the best possible piping size for 90% of the dsmers out there.. And if you feel the need for bigger pipes you better be throwing down some SERIOUS power like 750hp+

 

[v8s_are_slow]

Was kinda hard to understand some of your post but yeah, old thread. Guessing you're talking about me? As stated, "depends on setup". Also talking about your friend with big turbo and 3" piping doesn't really say much. We don't know what turbo he had, turbine housing size, displacement, tune, etc.

What might work for one person doesn't mean it's gonna work for someone else. I've seen people run FP Greens and run 13's. Others may run much faster. And I think piping size is about the same. But everyone is gonna argue over stuff like this, just like they do about everything else.

 

[thecman02]

Well I double checked the math being thrown around here and it all looks good. I'm so proud of my fellow dsmer's haha. I'm building a spreadsheet for my senior design project and figured I'd thrown in some numbers you guys had.

To reiterate what everyone else has said, losses from pipe sizing are going to be very minimal. The main gains are going to come from long radius bends, smooth transitions, and entrances.

Analyzing my piping setup at 52lb/m is a .06245psi pressure drop per foot with 2.5" piping. A short radius to long radius 90 elbow change is good for .1psi.

A bell mouth inlet to my turbo is worth approximately .5psi as opposed to an open turbo. I guess my question is, if that's a .5psi pressure drop before turbo does that get factored into a much larger boost drop after the compressor such as 1.5psi at PR of 3? I still have a decent amount of researching to do for my senior design.

Anyway for the layman, sizing only becomes a big deal if your at the rpm limit of your turbo. The loses can usually be eaten up by the turbo to compensate for any loss.

Some gains could also come from moving into the compressors map higher efficiency range if the intercooler can't keep the intake charge near ambient. I think this is another analysis I need to cover in my senior design.