08-26-2016, 12:50 PM
Join Date: Feb 2008
Location: Gilberts, IL
Total Cats: 102
SR20DET builds boost but feels NA
I am asking this question here because this is the community I am a part of even though I imagine a Nissan forum may be more appropriate. Plus, most of you are mad smart with car stuff so...
I have a friend who has a 240sx "race car" that weighs about 2700lbs dry. It has a garrett 2854 turbo at 18psi, aftermarket EMS, SR20DET "red top" motor.
It feels slow. We haven't had it on a dyno but it feels far too slow for the boost levels it is running at. It doesn't feel markedly different between wastegate and EBC.
The car has felt slow ever since he got it. It felts slower than it should have with stock ecu, piggybacked/chipped ecu, two different turbos (new, verified good), two different exhaust manifolds. Boost pressure (wastegate 6-8psi and ebc 18psi) is referenced to the ECU from the manifold.
swapped ecus from stock to Haltech and back
checked cam timing
checked to make sure the correct cams are in the right position (exhaust and intake not switched)
verified timing marks on damper mechanically correct to TDC
swapped exhaust manifolds
checked engine compression (150-160 across the board)
swapped spark plugs and wires
appropriate AFRs at full throttle/boost
swung the timing about four degrees forward and back with NO discernable change in power.
It IS a shitty BOV, but if the BOV or if there was a boost leak why would we be hitting 18psi by 3,000 rpm or so?
What are we missing?