Drivetrain Recirculated Or BOV
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2nd Gear
Joined: Feb 2007
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Recirculated Or BOV
So I just got my R56 and from what I understand its recirculated, hence no psssst endless you install an after market intake.
Has anyone looked into making it a true BOV? I know some cars will almost cut off if it has a MAF and you change it to BOV.
Thanks.
Has anyone looked into making it a true BOV? I know some cars will almost cut off if it has a MAF and you change it to BOV.
Thanks.
4th Gear
Joined: Mar 2007
Posts: 393
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From: San Francisco, CA
Preliminary thought is that venting to atmosphere will fool the MAF and drive the ECU crazy, with imminent power loss. When someone finally cracks the ECU and provides a user-tuneable program (ARE YOU LISTENING, VISHNU???), maybe a provision could be made for a BOV but until then, I can't imagine it will do anything positive for the car unless you are just after the pssst.
5th Gear
Joined: Oct 2006
Posts: 757
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From: Scottsdale, AZ
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1st Gear
Joined: Mar 2007
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saw the ALTA piece first hand at the Dragon....I still think that the filter needs to be enclosed into a cold air box. ALTAs intake lets the pressurized hose from the headlamp take its normal path and pours its air out under but parallel to the filter. The one I am working on turns the air feed up to force it into the filter and once I create my box to trap the air it should show more improvement. I wonder if my setup is louder than others? I can really hear the car when it comes on boost, not just when the valve closes.
This is not always true.
VW's new 2.0T runs fine when using a diverter valve release:
http://www.atpturbo.com/Merchant2/me...egory_Code=FSI
Yet another area where we should be looking at the VW guys for help.
VW's new 2.0T runs fine when using a diverter valve release:
http://www.atpturbo.com/Merchant2/me...egory_Code=FSI
Yet another area where we should be looking at the VW guys for help.
1st Gear
Joined: Mar 2007
Posts: 12
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This is not always true.
VW's new 2.0T runs fine when using a diverter valve release:
http://www.atpturbo.com/Merchant2/me...egory_Code=FSI
Yet another area where we should be looking at the VW guys for help.
VW's new 2.0T runs fine when using a diverter valve release:
http://www.atpturbo.com/Merchant2/me...egory_Code=FSI
Yet another area where we should be looking at the VW guys for help.
Neither type of valve is "better" than the other concerning function, operation, reliability, etc.Both serve to vent residual charge pressure at throttle lift to prevent reversion back into the compressor wheel preventing lag upon reapplication of the throttle. Whether the air is vented to atmosphere or recirculated makes no difference as to preventing reversion and subsequent lag.
The only reason to reciculate is if the engine management system (MAF-based usually) requires it or for quiet operation.
MAP-based engine management systems can easily run an atmospheric valve with no change to the driveability of the car. The reason OEM's use recirculating valves, however, is to maintain quiet operation. Think Neon SRT-4, BMW 335i, etc.
Since VW uses MAF-based engine management systems, they then have to use reciruclating valves. Had they used a MAP-based engine management from the begining, they still probably would have used a recirculating valve as OEM, but only because they're quieter.
The FSI ECU, however, does not appear to be quite as sensitive to atmospheric vs. recirculating operation, and is why we're not seeing any issues with our valve spacers. There are other reasons why adapting universal atmospheric valves are not having success as I've mentioned in another thread.
The only reason to reciculate is if the engine management system (MAF-based usually) requires it or for quiet operation.
MAP-based engine management systems can easily run an atmospheric valve with no change to the driveability of the car. The reason OEM's use recirculating valves, however, is to maintain quiet operation. Think Neon SRT-4, BMW 335i, etc.
Since VW uses MAF-based engine management systems, they then have to use reciruclating valves. Had they used a MAP-based engine management from the begining, they still probably would have used a recirculating valve as OEM, but only because they're quieter.
The FSI ECU, however, does not appear to be quite as sensitive to atmospheric vs. recirculating operation, and is why we're not seeing any issues with our valve spacers. There are other reasons why adapting universal atmospheric valves are not having success as I've mentioned in another thread.
6th Gear
Joined: Aug 2005
Posts: 1,335
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From: Tucson, AZ
Just to clarify, the Forge "BOV" that has been available for a long time now is simply a spacer and noise maker. The electronic DV is still in place and functions in recirc mode. They have recent released a new DV solution for the 2.0TFSI engine that allows the use of a mechanical valve for reliability at high boost levels as many of us were blowing the rubber diaphragm in the OEM units. This new setup still incorporates the electronic system in a piggyback style fooling the ECU so no CEL's are thrown. The issue I have heard with this already is serious compressor surge. No bueno for your turbo long term.
In regards to MAF vs. MAP based tuning, even with an ECU reflash it is no simple deal to convert from a recirc system to an atmospheric system. The MAF will still be looking for that flow. True, you do run a LARGER MAF housing, but it is still there. Believe me, this causes no end of fits for those of us running FI VR6 applications. It's easier to run recirc bottome line. Leave the "pfffssst" to the SRT-4's.
In regards to MAF vs. MAP based tuning, even with an ECU reflash it is no simple deal to convert from a recirc system to an atmospheric system. The MAF will still be looking for that flow. True, you do run a LARGER MAF housing, but it is still there. Believe me, this causes no end of fits for those of us running FI VR6 applications. It's easier to run recirc bottome line. Leave the "pfffssst" to the SRT-4's.
5th Gear
Joined: May 2007
Posts: 603
Likes: 1
From: Aventura, Florida
I installed one of the forge plates in a buddys gti, the actuator just vents to atmosphere, there is little to no recirculation. How do you think it makes noise? His car acted fine with it. Had apr tune and a turboback. e-dv rules
6th Gear
Joined: Aug 2005
Posts: 1,335
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From: Tucson, AZ
5th Gear
Joined: May 2007
Posts: 603
Likes: 1
From: Aventura, Florida
Hey, just going off what Mike at Forge has said time and again on the Mk5 forums and golfmkv.com......The spacer is just that.....a spacer......I can think of few things more annoying than hearing this thing go off. It is crazy that tooling around in a parking lot, off boost, that it makes noise...just screams RICE....IMHO....
6th Gear
Joined: Aug 2005
Posts: 1,335
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From: Tucson, AZ
5th Gear
Joined: May 2007
Posts: 603
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From: Aventura, Florida
You are entirely correct.
1st Gear
Joined: Jun 2007
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It's here! Just reach here a moment ago.haha..
Installation should be very easy. Just a adapter to the existing solenoid with holes to let the gas out, Said to improve performance because it expel the hot air from the recirculation valve instead of turning the hot air back to the intake.
www.forgemotorsport.co.uk
Will update again after installation!
Installation should be very easy. Just a adapter to the existing solenoid with holes to let the gas out, Said to improve performance because it expel the hot air from the recirculation valve instead of turning the hot air back to the intake.
www.forgemotorsport.co.uk
Will update again after installation!
