Quote:
Yokohama wrote:
I am no expert in A-series turbocharging. However, looking at turbo kits for the Nissan L-series, I would say no more than 5psi for this motor, as it is "draw thru" and not "blow thru".
There are several problems with the draw thru turbo systems, they include:
3. No blow-off valve can be used in the draw-thru type since it would vent air and fuel into the atmosphere, VERY BAD! Since you would not have a blow-off valve, you would have a bad case of compressor surge during off throttle periods. This is bad for the turbo and its seals, etc.
huh?
you don't need a BOV in a draw thru setup at all.
the butterfly is IN FRONT of the compressor, not after it. so shutting the throttle off isn't going to cause any problems with flow reversion, or "compressor surge" as you put it.
having a BOV in a draw thru setup would have fuel spewing all over a hot engine bay on every gear change. it's okay if you like fireworks i guess...
and like A14Force said, get a decomp shim and run 1bar thru it til it breaks, then rebuild it so it doesn't. why piss around with 5psi?
A series engines are stronger than most people give them credit for. and if you do break one, a whole engine rebuilt can be had for under $500.
have fun
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