Blow off valve

Ezpzrider · 09-01-2020, 07:25 AM

Hey just joined and waiting for my 2021 to come in the LT2 with the 2.0 liter turbo. It’s my first camaro and I cannot find a Blow off valve just for the camaro. Also looking to do some mods without messing around with my warranty it’s a lease. Any I out would help thinking about doing a simple straight pipe to sound better along with the BOV

dmcmahan60 · 09-01-2020, 09:39 AM

Putting an aftermarket BOV will and can mess with your warranty. Spend your money on something else. Good luck.

Ezpzrider · 09-01-2020, 11:19 AM

Had one on my last turbo took it off no problem before i gave it in. But is there any BOV for the camaro ???

HyperBlue1SS · 09-01-2020, 12:07 PM

I have no working knowledge of the GM 2.0 liter turbo but on my STi with the 2.5L engine it was factory equipped with a recirculating BPV. The MAF metered for a certain amount of air and would recirculate the already metered air back into the intake when the BPV activated. If you added a blow off valve and did not have the engine tuned it could cause issues with your A/F ratios.

Maybe someone with a little more knowledge on these engines could chime in!

RyanR623 · 09-01-2020, 12:23 PM

Quote:

Originally Posted by HyperBlue1SS

I have no working knowledge of the GM 2.0 liter turbo but on my STi with the 2.5L engine it was factory equipped with a recirculating BPV. The MAF metered for a certain amount of air and would recirculate the already metered air back into the intake when the BPV activated. If you added a blow off valve and did not have the engine tuned it could cause issues with your A/F ratios.

Maybe someone with a little more knowledge on these engines could chime in!

This. I came from a WRX as well. I'm sure it's the same with the camaro.

dmcmahan60 · 09-01-2020, 02:38 PM

Quote:

Originally Posted by HyperBlue1SS

I have no working knowledge of the GM 2.0 liter turbo but on my STi with the 2.5L engine it was factory equipped with a recirculating BPV. The MAF metered for a certain amount of air and would recirculate the already metered air back into the intake when the BPV activated. If you added a blow off valve and did not have the engine tuned it could cause issues with your A/F ratios.

Maybe someone with a little more knowledge on these engines could chime in!

Same here. I had a 2008 STI and changing the stock BOV would cause issues. It was a big no no in the Subaru community:(

JamesNoBrakes · 09-01-2020, 03:02 PM

I had a 2004 WRX. It was a common misconception that you should change the blow off valve so it would make the "psssssssh" noise. The "pppssshhh" came from removing the stock intake silencer. Factory BOV is fine, unless you are going to far more boost with a bigger turbo and you need a stronger valve to hold that back. The modern cars are coming with recirculating BPV as described above.

crosive · 09-01-2020, 04:27 PM

I'm not sure how the camaro is, but most turbocharged engines reroute the bov back into the intake because the air is already metered, so when you blow off, it discharges already metered air and you'll run rich.

some cars can handle this, some cars can't. Some cars don't have inline air sensors to measure air and go off of manifold pressure alone, so the air hasn't reaching the measuring point yet, and you can blow off all day long.

the general rule of thumb however, is if you are under warranty, replacing your bov with aftermarket will void the powertrain warranty.

HyperBlue1SS · 09-01-2020, 06:54 PM

Quote:

Originally Posted by JamesNoBrakes

I had a 2004 WRX. It was a common misconception that you should change the blow off valve so it would make the "psssssssh" noise. The "pppssshhh" came from removing the stock intake silencer. Factory BOV is fine, unless you are going to far more boost with a bigger turbo and you need a stronger valve to hold that back. The modern cars are coming with recirculating BPV as described above.

I 100% agree! To the OP, your money is best spent on CAI. The factory BPV will definitely give you that BOV sound your looking for but not have near the downside of running a vent to atmosphere BOV. Ideally you should probably still be tuned but I don't really see a lot of downside to running a CAI without a tune as actually installing a BOV! The ECU should be able to compensate for the increased airflow and still function properly.

Ezpzrider · 09-02-2020, 08:30 AM

Thanks for the info. But yes I’m looking for that woosh sound On my last one I loved it. So the factory BPV should get what I’m looking for ?

Ezpzrider · 09-02-2020, 09:18 AM

Also reading a BPV spacer is much better and could produce more of that noise

dmcmahan60 · 09-02-2020, 11:31 AM

Quote:

Originally Posted by HyperBlue1SS

I 100% agree! To the OP, your money is best spent on CAI. The factory BPV will definitely give you that BOV sound your looking for but not have near the downside of running a vent to atmosphere BOV. Ideally you should probably still be tuned but I don't really see a lot of downside to running a CAI without a tune as actually installing a BOV! The ECU should be able to compensate for the increased airflow and still function properly.

Running a CAI on a Subaru without a tune will cause a lean condition and pop an engine. Seen it happen. I had an AEM on my car along with the Cobb hand held tuner. Cobb had MAPS specifically for the AEM intake and that was the only one I would consider installing on my car. I don't know how sensitive or picky GM is about the tunes from the factory but it would be worth looking into.

JamesNoBrakes · 09-02-2020, 11:37 AM

Quote:

Originally Posted by dmcmahan60

Running a CAI on a Subaru without a tune will cause a lean condition and pop an engine. Seen it happen. I had an AEM on my car along with the Cobb hand held tuner. Cobb had MAPS specifically for the AEM intake and that was the only one I would consider installing on my car. I don't know how sensitive or picky GM is about the tunes from the factory but it would be worth looking into.

The intake was a Subaru SPT and didn’t require a tune. It was more of a “hot air intake”. I was running Cobb stage 2 though.

Elite Engineering · 09-02-2020, 11:57 AM

HyperBlue1SS

And the others are 100% correct. With a "pull through" MAF you cannot VTA (vent to atmosphere) as all air is measured (metered) by the MAF prior to the turbo. A "Blow through" MAF is placed app. 6-12" from the throttle body and only measures the charge air as it enters the intake manifold. JacFab may have a larger recirculating unit I would check and see, but to convert to blow-through would require an entirely different configuration on these, just like the Subaru and many other OEM systems. If you want more power, hard to beat Coopers Camaro for tuning these. Huge improvement, and of course the billet stall converter for the A8 that corrects the shudder and knocks .2-.5 seconds off 0-60 times.

Cheers!!

09-01-2020, 07:25 AM	#1
Ezpzrider Drives: 2021 camaro 2LT Join Date: Aug 2020 Location: Suffolk county, NY Posts: 10	Blow off valve Hey just joined and waiting for my 2021 to come in the LT2 with the 2.0 liter turbo. It’s my first camaro and I cannot find a Blow off valve just for the camaro. Also looking to do some mods without messing around with my warranty it’s a lease. Any I out would help thinking about doing a simple straight pipe to sound better along with the BOV

09-01-2020, 12:07 PM	#4
HyperBlue1SS Drives: 2018 Hyper Blue Camaro 1SS Join Date: Sep 2019 Location: Northeast Kansas Posts: 119	I have no working knowledge of the GM 2.0 liter turbo but on my STi with the 2.5L engine it was factory equipped with a recirculating BPV. The MAF metered for a certain amount of air and would recirculate the already metered air back into the intake when the BPV activated. If you added a blow off valve and did not have the engine tuned it could cause issues with your A/F ratios. Maybe someone with a little more knowledge on these engines could chime in! __________________ 1LE Replicas / Solo Axleback Exhaust/ Street Scene Front Splitter / Diode Dynamics Smoked LED Side Markers / OEM Smoked Tails & Third Brake Light / OEM Illuminated Door Sills / OEM ZL1 Side Skirts / OEM ZL1 Spoiler / OEM Black Badges / GM CAI / Soler Engineering TB/TC / Katzkin Leather / 20% Tint

09-01-2020, 03:02 PM	#7
JamesNoBrakes Drives: 2SS 1LE Join Date: Oct 2011 Location: AK Posts: 2,301	I had a 2004 WRX. It was a common misconception that you should change the blow off valve so it would make the "psssssssh" noise. The "pppssshhh" came from removing the stock intake silencer. Factory BOV is fine, unless you are going to far more boost with a bigger turbo and you need a stronger valve to hold that back. The modern cars are coming with recirculating BPV as described above. __________________ Everything happens for a reason, except when it doesn't, but even then, you can, in hindsight, fabricate a reason that satisfies your belief system. 2018 2SS 1LE 2023 Colorado ZR2 2022 Stinger GT-line AWD

09-01-2020, 09:39 AM	#2
dmcmahan60 Drives: 2017 SS Join Date: Jan 2018 Location: Arab, AL Posts: 763 View My Garage	Putting an aftermarket BOV will and can mess with your warranty. Spend your money on something else. Good luck.

09-01-2020, 11:19 AM	#3
Ezpzrider Drives: 2021 camaro 2LT Join Date: Aug 2020 Location: Suffolk county, NY Posts: 10	Had one on my last turbo took it off no problem before i gave it in. But is there any BOV for the camaro ???

09-01-2020, 04:27 PM	#8
crosive Drives: 18 zl1 Join Date: Aug 2017 Location: central alabama Posts: 935	I'm not sure how the camaro is, but most turbocharged engines reroute the bov back into the intake because the air is already metered, so when you blow off, it discharges already metered air and you'll run rich. some cars can handle this, some cars can't. Some cars don't have inline air sensors to measure air and go off of manifold pressure alone, so the air hasn't reaching the measuring point yet, and you can blow off all day long. the general rule of thumb however, is if you are under warranty, replacing your bov with aftermarket will void the powertrain warranty.

09-02-2020, 08:30 AM	#10
Ezpzrider Drives: 2021 camaro 2LT Join Date: Aug 2020 Location: Suffolk county, NY Posts: 10	Thanks for the info. But yes I’m looking for that woosh sound On my last one I loved it. So the factory BPV should get what I’m looking for ?

09-02-2020, 09:18 AM	#11
Ezpzrider Drives: 2021 camaro 2LT Join Date: Aug 2020 Location: Suffolk county, NY Posts: 10	Also reading a BPV spacer is much better and could produce more of that noise

09-02-2020, 11:57 AM	#14
Elite Engineering Drives: 2010 Camaro Join Date: Nov 2009 Location: Denver Posts: 1,381	HyperBlue1SS And the others are 100% correct. With a "pull through" MAF you cannot VTA (vent to atmosphere) as all air is measured (metered) by the MAF prior to the turbo. A "Blow through" MAF is placed app. 6-12" from the throttle body and only measures the charge air as it enters the intake manifold. JacFab may have a larger recirculating unit I would check and see, but to convert to blow-through would require an entirely different configuration on these, just like the Subaru and many other OEM systems. If you want more power, hard to beat Coopers Camaro for tuning these. Huge improvement, and of course the billet stall converter for the A8 that corrects the shudder and knocks .2-.5 seconds off 0-60 times. Cheers!!

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