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Over last winter I replaced the 2332 VW Turbo motor with a 2.5 Subaru Turbo motor. It does not spool up until 4000 or so RPM in 2nd gear and does not build Boost much above 2 to 3#. On the VW motor this same Turbo T-3 60 Trim would Spool up at 2500 and go to 8# (wastegate setting) quickly. The waste gate is working etc. The differences between the VW setup and the Subaru setup is longer exhaust pipes (same diameter) up to the Turbo. The rear cylinder pipes are aprox. 3.5' long and the front cylinders are Aprox. 2' long. The VW pipes are probably a foot shorter on the rear cylinders. Also larger diameter intake track tubing (From 2" ID to 2.75"ID). My theory is the longer Exhaust is loosing way too much heat and velocity pressure to spin the Turbine. Also the 2.75" Intake track tubing has a lot more volume than the 2" to build pressure quickly. How much difference would heat tape make on the exhaust side? Any thoughts
Where is that engineer fella? The 2.75" is the culprit - you have lowered the pressure by increasing the volume. Well, just my guess and I dont have a second cup of coffee yet.
It does not spool up until 4000 or so RPM in 2nd gear and does not build Boost much above 2 to 3#.
Yes he has increased the volume but that should only slow down the time it takes to spool up to pressure.