| I did this because my rationale to the debate is that the blowoff is there solely to prevent compressor surge on the turbocharger. The closer to the turbo it resides, the better it can vent the pressure from the compressor while the turbo is spooling down. The pressure can be vented from anywhere in the system effectively as long as the flow volume is enough to prevent intake gas reversion and a sizeable increase in tract pressure. Granted, a good set of intercoolers is going to let air flow through them with little restriction, but, when the turbo is spinning that quickly and then you eliminate the pressure it is generating (when the BOV opens), the compressor is terribly inefficient (you can reference this in the compressor map - just look at the very high airflow and very little pressure and you will see that the comrpessor will be operating in a very inefficient region to the far right at first, of which will fall back to the right as the compressor spools down). With this in mind, when the BOV releases pressure off the turbo while the turbo is spinning some 100K RPM, the air coming out of the turbo is really hot and I'd rather not put all that through my intercooler to further heat soak it. There's a good point. This however is offset by the fact that intake gas reversion is going to decrease response time. Would aluminum absorb that much extra heat in the 1/8 second the throttle closes between shifts? Hence, I put the BOVs close to the turbo outlet.
Recursively Yours,
Kenny...
PETZ Member #5
SteamyZ. Never had did me wrong. - SL103 07/06/04 11:58:15
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