Turbo BlowOff Valve Placement?
Turbo BlowOff Valve Placement?
(OP)
does anyone have any experience with turbocharged cars? ive been debating with a few of my friends over the placement of a compressor bypass valve or blow off valve on the charge piping. some say it works best nearest the throttle body and others say it works best nearest the outlet of the compressor. correct me if im wrong, but i belive the valves basic function is to prevent compressor surge by preventing shockwaves. anyone have any good recommendations on websites and or books that discuss compressible flow?
thanks
javier
thanks
javier





RE: Turbo BlowOff Valve Placement?
RE: Turbo BlowOff Valve Placement?
Regards
pat
RE: Turbo BlowOff Valve Placement?
javier
Custom Turbo Applications
http://www.full-race.com
RE: Turbo BlowOff Valve Placement?
Right up by the throttle body prevents any airflow reversion, but there is a pressure drop across the intercooler and the piping and flow will be slightly less. With a good setup, the pressure drop will be minimal.
Either location will prevent a pressure spike at the compressor from damaging the thrust bearing. If you have large pipes and IC with lots of boost, i'd suggest putting it up by the throttle body and investing in a good BOV. If the system is more reasonable, then i wouldn't worry about where you put it. The factory BOV from a 90-94 Eagle Talon/Mitsubishi Eclipse is a good BOV for most applications that aren't running tons of boost or airflow..
RE: Turbo BlowOff Valve Placement?
javier
Custom Turbo Applications
http://www.full-race.com
RE: Turbo BlowOff Valve Placement?
RE: Turbo BlowOff Valve Placement?
RE: Turbo BlowOff Valve Placement?
RE: Turbo BlowOff Valve Placement?
I have tried a bypass valve in both locations in my intercooler equipped Merkur XR4Ti and it did a much better of mitigating compressor stall on throttle closing when I moved it from the compressor outlet to just in front of the throttle body. All the OEM applications I've seen use this location also. Something to consider is the temperature of air coming out of the compressor. 250-300°F is not unusual for engines runnig 15psi or more boost. I have seen bypass valves fail due to overtemperature when located prior to the intercooler.
Geoff.