Join Date: Nov 2007
My Ride: Neons + Caravan
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Turbo intake pipe: Optimal Length and Size?
Back when I was doing an N/A neon build, I remember how the intake pipe size and length could put additional torque peaks throughout the band, improving power in some areas, if not all. From what I recall (been years), the longer the pipe, the lower the peak torque was added. The bigger around the pipe, the less restrictive to preserve top end performance. I ended up doing I think a 2.5" or 3" pipe that snaked through up into the fender that was like a few feet long all together. Never did get a chance to dyno the difference, but I have seen other people who have.
Now in the turbo world, I was curious: does this phenomenon play a roll?
Currently, I have the S60 Turbonetics on my 2.5L. Being the stickler that I am, I want to try and get everything done "right". Currently, the intake goes: Turbo > 3.0L rubber pipe > Cone filter. I think the rubber pipe has to be ~12" or longer. This places the filter right next to the tranny mount.
I am about to do a new tranny cooler, which leaves a nice, large area of fresh air to enter the engine bay. I wanted to extend the intake pipe to get the filter in on that action, as it is a straight shot to do so.
I know a lot of SRT owners go straight to a full 3" pipe on their turbos. I also know most SRT owners just buy whatever is available without a thought into it. I'm cursed with that scientific/perfectionist need. The inlet is currently a 2.5" from the turbo. I was thinking of doing a stepped system, like going 2.5" pipe > 3" pipe... or even trickier, doing a "funnel" design to do the same thing.
Anybody have any insight or am I just rambling about something simpler than I want it to be?