atmospheric bypass valve

[Super_Sonic_RS]

Question..... will a tune be required with the forge atmospheric bypass valve that BNR sells?

 

[Dubbs_RS]

Yes. You do.

The car ECU doesn't expect you to dump air to atmosphere, so you will run rich on shifts/whenever you dump boost. You will run rich because the amount of air going into the intake manifold will be less than expected

 

[Natesriv]

Edit...i was wrong...comment withdrawn.

 

[Dubbs_RS]

Huh ? Nope, I've a BNR which replaced my OEM valve, no issues, ~37mpg
The OEM is atmospheric, just plastic, both valves dump air from the intake into the atmosphere.

No tune, just check my build thread for some tips and pics
Forge Motorsports 1.4T Atmospheric Bypass Valve
BLOWOFF valves are a different matter though.

OEM is NOT atmospheric. It is a recirculating valve and dumps the boost back into the intake manifold like the Forge recirculating BPV. The part that you linked is a blowoff valve (aka an atmospheric bypass valve).

Are you sure that you are not running this: Forge Motorsports 1.4T Recirculating Bypass Valve ?

It looks like you bought the BPV: http://www.sonicownersforum.com/for...e-bpv-ttr-trans-mount-trifecta-cable-etc.html

Super Sonic... Trust me. You should tune prior to running the atmo bypass valve. It has been discussed numerous times on this forum.

 

[JDKING]

I can confirm on that oem is not atmospheric it definitely is recirculsting


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[Natesriv]

here's mine installed, yeah it's not atmospheric (the box says it is, but I just went and looked...it's sealed, so my air dumps into the RIGHT spot)

Thanks for the clarification

 

[Natesriv]

so, yup...TUNE IT

 

[Dubbs_RS]

here's mine installed, yeah it's not atmospheric (the box says it is, but I just went and looked...it's sealed, so my air dumps into the RIGHT spot)



Thanks for the clarification

No problem! I just wanted to make sure we don't give OP bad info and then something happens to his motor.

 

[Kuntryboy865]

Tune it before you install or tune it after install?

 

[Dubbs_RS]

Well if you are installing the BOV and tune at the same time it doesn't matter which order you do it in, I just wouldn't suggest driving the car without the tune.

I know with the Trifecta tune, you could tune before install (called an ECP tune if I recall correctly) and drive the car regardless of whether or not you installed the BOV. However, I wouldn't install the BOV and then drive the car without tuning.

 

[Kuntryboy865]

Well if you are installing the BOV and tune at the same time it doesn't matter which order you do it in, I just wouldn't suggest driving the car without the tune.

I know with the Trifecta tune, you could tune before install (called an ECP tune if I recall correctly) and drive the car regardless of whether or not you installed the BOV. However, I wouldn't install the BOV and then drive the car without tuning.

With how busy he is lately you can't really tune and install it at the same time. That's why I was wondering if he could tune for it before installing it because with the amount of work load hes got its a few days before he gets back to you.

 

[Dubbs_RS]

With how busy he is lately you can't really tune and install it at the same time. That's why I was wondering if he could tune for it before installing it because with the amount of work load hes got its a few days before he gets back to you.

I can only confirm that tuning before installing is okay for an ECP enabled Trifecta tune. I don't have enough experience or knowledge of the other available tunes to conclusively say that it will be okay.

 

[Greasemonkey]

so... the car is going in for a new warrantied turbo. are they going to void the warranty with the bypass valve on? my biggest problem is that I don't have the stock one to put back on..... hopefully they give me the old BOV back if they actually do warranty it.

 

[SuperSonicRS]

I can confirm that you do NOT need a tune to run the Forge atmospheric BOV. It works just fine on the stock tune. Been running it for 2 or so weeks while I wait on Jerry for a tune with no issues.

 

[ScarabEpic22]

I can confirm that you do NOT need a tune to run the Forge atmospheric BOV. It works just fine on the stock tune. Been running it for 2 or so weeks while I wait on Jerry for a tune with no issues.

You might not 100% NEED one, however it is HIGHLY recommended. You're seriously altering the ECM's ability to measure and know what the airflow volume is within the intake tract, which of course, alters fueling. Glad you're getting a tune, in the meantime throw your AutoCal on and datalog your LTFTs.

 

[Greasemonkey]

its not that I need a tune... I have ran the car without the tune before. problem is, I don't have the STOCK bypass valve anymore... im going to buy the stock one and put it in before I take the car in for warranty...

 

[mendoza_juan]

Just wondering, why go with atmospheric purge over recirculating? I tried to do some research on this and it doesn't seem to provide any difference other than the way it releases pressure.

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[carsNskis]

Just wondering, why go with atmospheric purge over recirculating? I tried to do some research on this and it doesn't seem to provide any difference other than the way it releases pressure.

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If the ecu isn't looking for the purge air back through the intake it doesn't matter, but the stock ecu does.

To get the most out of an atmospheric dump it's best to run a tune, but I'm seeing them run without for a short time (waiting for tune)

....if it has tits or tires it can be upgraded

 

[mendoza_juan]

If the ecu isn't looking for the purge air back through the intake it doesn't matter, but the stock ecu does.

To get the most out of an atmospheric dump it's best to run a tune, but I'm seeing them run without for a short time (waiting for tune)

....if it has tits or tires it can be upgraded

Yes, this is what ive come to understand, that without a tune you'll end up running rich. Personally I'll probably just end up getting the forge recirculating instead of atmospheric. I like not having to mess with the ecu if I don't have to

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