Re: Measuring stock exhaust restriction
I did some testing of my own using a drilled out O2 sensor and a pressure gauge plugged into the rear O2 housing.
With gutted precats, a 3" downpipe (2 x 2.5" flowing into 3" pipe), no cat and 3" piping back to the stock catback with DR650Rs at 24 psi (dropping to 21 psi by redline), I am seeing 9 psi of back pressure. This isn't quite as much as I had hoped, but I think its still worthwhile replacing the stock exhaust. I figure the reason for the discrepancy between FWombat's numbers and mine is because he has a Td05 setup whereas mine is Td04.
Edit: I ended up finding a large exhaust leak where my rear O2 housing meets the downpipe. Therefore, I think my exhaust back pressure is probably much higher than what I measured.
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'91 VR4 - Modlist: DR650R turbos, Snow stage 2D alky kit, DSM SMICs, blowthrough ported LT1 MAS, Dejon Tool intakes & y-pipe, Blitz DSBC Spec R, HKS SSQV BOV, PTE 580cc injectors, Dual feed fuel system with Aeromotive FPR & filter, Hotwired Supra pump, ek2mfg plenum spacer, HKS DLI, MSD Wires, Apex'i S-AFC II, MAFTranslator, Turbobob ECU, Scanmaster III, LC-1 WBO2, ESP downpipe, Vac/EGR delete, Gutted precats and test pipe, Maximal solid mounts, 300m 18 spline output shaft, Centerforce Dual Friction clutch, RPS flywheel, GC coilover conversions with helper springs, Powerslot slotted rotors, Goodridge SS brake lines, Hawk pads (front), Stillen metal matrix pads (rear)
Last edited by DoctorDex : 05-22-2008 at 12:08 PM.
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