997 GT2 Stock diverter valves (BRV) Part number
03-17-2011 | 08:43 PM
#16
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From: Qatar
A bit of background: the diverter valves (aka blowoff valves) are on the intake part of your air system, located between the intercooler exit and throttle body. They deal with COOL not hot air. Look for them on the top of the engine, somewhat deep in the engine bay. The left one is slightly beyond the coolant reservoir (that white plastic tank with a blue cap) and the other at about the same place on the mirroring side.
As you will see, these are rather far away from the turbos attached to the exhaust manifold. I think you may have gotten them confused with wastegate actuators which, like you said, are attached to the turbo housing.
Whether you go with OEM, EVO or whomever, diverter valves are really a simple thing--they pass intake air to the throttle body and prevent pressure in the intake system from exceeding a pre-set level (typically caused by a snap-closure of the throttle butterflies). When said pressure's exceeded the valves open and vent the excess into either the atmosphere or exhaust. Hardly any rocket science at all...in fact I hazard to say they're one of the lowest-tech plastic bits in your teutonic steed...
Ricers can go ad nauseum about diverters since these things can make some dramatic noise (that boo-schweee sound at throttle lift) but functionally they're all the same as long as they hold boost.
As you will see, these are rather far away from the turbos attached to the exhaust manifold. I think you may have gotten them confused with wastegate actuators which, like you said, are attached to the turbo housing.
Whether you go with OEM, EVO or whomever, diverter valves are really a simple thing--they pass intake air to the throttle body and prevent pressure in the intake system from exceeding a pre-set level (typically caused by a snap-closure of the throttle butterflies). When said pressure's exceeded the valves open and vent the excess into either the atmosphere or exhaust. Hardly any rocket science at all...in fact I hazard to say they're one of the lowest-tech plastic bits in your teutonic steed...
Ricers can go ad nauseum about diverters since these things can make some dramatic noise (that boo-schweee sound at throttle lift) but functionally they're all the same as long as they hold boost.
Now im getting a little confused , The boost recirculation valve is actually the diverter valves on our VTG cars correct??
For example on this link the agency power BRV (diverter valves) on post 6 shows that it is directly fitted on the turbine housing?
http://www.6speedonline.com/forums/9...on-valves.html
03-18-2011 | 01:20 AM
#17
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Joined: Sep 2009
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From: Driver's Seat
TTurbine what you posted are wastegate actuators for controlling the amount of exhaust flow into the primary turbine. There's one vacuum line going into the nipple connector up top, controlling the output which is a rod connected to the wastegate. Put simply, it's a completely different thing. I doubt this is the part you need?
Sharkey has done a diverter upgrade on a 997.2TT. A few pics relate to the location and design of the valves which are on the UPPER part of the engine. Check this out:
http://sharkwerks.com/porsche/997-tu...i-exhaust.html
Re-reading your original post, it seems that you suspect your car's not holding boost. Do understand this can happen from a whole host of reasons, including any of the following:
1. Diverter valve
2. Wastegate actuator
3. Intercooler charge & output pipe fittings, or the intercooler itself
There are many more probable causes but the point is, your DV is only one of the few possibilities. Unless you know for sure it's the DV, you should have your dealer perform a boost leak test and diagnose what you REALLY need...
Sharkey has done a diverter upgrade on a 997.2TT. A few pics relate to the location and design of the valves which are on the UPPER part of the engine. Check this out:
http://sharkwerks.com/porsche/997-tu...i-exhaust.html
Re-reading your original post, it seems that you suspect your car's not holding boost. Do understand this can happen from a whole host of reasons, including any of the following:
1. Diverter valve
2. Wastegate actuator
3. Intercooler charge & output pipe fittings, or the intercooler itself
There are many more probable causes but the point is, your DV is only one of the few possibilities. Unless you know for sure it's the DV, you should have your dealer perform a boost leak test and diagnose what you REALLY need...
03-22-2011 | 11:23 PM
#18
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Joined: Jan 2006
Posts: 130
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From: London
997.113.203.71
Same part used in 997.1TT thru GT2RS (illustration is from Gen 2 TT but same goes for 2RS--I checked)
U need two of these BTW.
While you're at it, why not consider spring-operated alternatives (as opposed to OEMs which are diaphragm-based) for better consistency/durability:
http://www.championmotorsport.com/pr...p/cmsdv02b.htm
.
Same part used in 997.1TT thru GT2RS (illustration is from Gen 2 TT but same goes for 2RS--I checked)
U need two of these BTW.
While you're at it, why not consider spring-operated alternatives (as opposed to OEMs which are diaphragm-based) for better consistency/durability:
http://www.championmotorsport.com/pr...p/cmsdv02b.htm
.
Do you know how it is possible to get those?
03-23-2011 | 05:27 AM
#19
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Joined: Sep 2009
Posts: 3,581
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From: Driver's Seat
I wouldn't mess around with this myself. Calibrating the actuator rod is a precise affair failing which you'll certainly run into over/under-boost problems.
03-23-2011 | 05:46 AM
#20
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From: Qatar
03-24-2011 | 06:50 AM
#21
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Joined: Jan 2006
Posts: 130
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From: London
yes it is this part i think and unfortunately it keeps leaking on my (and other) cars.. I have changed 4-5 sets so far as I run high boost. The aftermarket ones are spring based and more harsh and noisy so I dont really prefer them but it is getting very difficult to find those stock BRVs..
03-24-2011 | 07:39 AM
#22
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yes it is this part i think and unfortunately it keeps leaking on my (and other) cars.. I have changed 4-5 sets so far as I run high boost. The aftermarket ones are spring based and more harsh and noisy so I dont really prefer them but it is getting very difficult to find those stock BRVs..
