Quote:
Originally Posted by cbehnken
how's $300 on a good DR650  |
I still would be worried about pushing them hard because dr650's are clipped turbines.
The majority of the backpressure in our cars has nothing to do with the exhaust, it has everything to do with the turbine and turbine housing. So just play with that scenario in your mind engine bank 1,3,5 is seeing different amounts of backpressure compared to 2,4,6 on the exhaust stroke. At low boost settings, its no big deal but at the settings where the dr650 is doing most of the work and the other turbo is out of its efficency range thats unequal amounts of stress on your crank coming from the different banks.
A engine is harmonic chaos, you don't want to do anything that will break up the harmony and unequal pressures is one thing you can do to destroy the harmony. Not that your engine will fail immediately because it won't, our engines are pretty strong but I wouldn't roll around at 18-20 psi for a whole tank either.
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His - Red 93 RT/tt
Mods: Hallman's MBC @ 16 psi, turbo XS type H BOV, stillen dp, custom exhaust, Spec stage 2 clutch, RPS FW, 3sx lightweight crank pulley, BCP7RES-11 @ .030 gap, autometer gauges, slightly gutted mas, dsm SMIC's, ACPT 1 piece CFDS, Tein S springs, pte 580 inj's, safc neo/SITC, 13t's, hotwired walbro, maximal performance solid motor mounts, DR plenum spacer.
Hers - BPU Green 94 vr4