Compressor Surge, Turbo Flutter

[stormtrooper]

So i recently installed CP-e's Intercooler pipes with the Tial BOV. I posted a video on facebook showing people what it sounded like. Well i was informed that thats not how its suppose to sound. That it was compressor surge. Telling me that i have the wrong spring in it. Soo i need to find out what spring i need so nothing happens to my turbo. Any insights. Im not sure what comes pre installed. Ill have to ask whoosh.

Heres the video i had.

https://www.facebook.com/larry.c.brackeen/videos/10152979215361330/

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[JohnDoe]

Yikes, should of just stuck to stock bov if you're sticking to stock pressure

 

[Brad]

True compressor surge happens at WOT. You need a lighter spring. I don't know if Tial's BOV's are adjustable like Turbosmart BOV's but if they are set it to the lightest setting.

 

[higdominator]

My TS BOV does that at lower boost levels. What's it do on the street, part throttle let off versus full throttle (good amount of boost) let off? may just need to properly adjust the tension.

 

[Punchy04]

My TS bov does that too at low boost even at the lowest setting which is amplified (sucking noise) by my Roush Cai.

 

[stormtrooper]

Turns out it has a 6lb spring In it. But it does the same thing as in the video when driving around. Itll flutter when you barely get into the throttle and let off

 

[Tune+]

I recommend using a smaller, lighter BOV. The reason why a lot of manufacturers are using electronic BPV's is to prevent surging like this The reason a lot of stock BOV's on older cars are weak and don't hold a lot of boost is because of the light spring, again to prevent surge.

I always recommend BOV's to be mounted close to the turbo, if paying attention to manufacturers has taught me anything, it is that they have much more technology at their disposal that I would ever have. That being said, Borg Warner has a compressor mounted BPV, Ford OEM's have compressor mounted BPV's, if not compressor mounted very close to the turbo (Ecoboost Mustang), VW, SKODA, GM, all have compressor cover mounted BPV's or close to turbo. If they aren't electronic, they are very weak springs (VW).

The reason for upgrading from weak spring BOV's is clear, but electronic it takes a little more thought on why it is good to upgrade. Well, first off with it being electronic the OEM's take advantage of having something to help with load control, and well, anything control. The point of this is mostly for emissions, to bleed off boost and keep the vehicle in stoichiometric as long as possible (14.7 AFR) until load targets are exceeded then it allows it to go to a "power demand" AFR (10.6:1 stock). During this time, even though AFR is being targeted for power, the boost is still being regulated by the throttle body for combustion stability, and if you return to part throttle the BPV takes over again.

This all can be avoided with proper tuning to make a more enjoyable driver experience. The limit of the factory BPV is about 27psi, and not recommended for any turbo upgrade at all, even the new stock frame turbo's that are coming out. Increase CFM will start to cause issues even at lower boost. Upgraded BOV's should be selected based on your power goals and turbo. Big power BOV's like the Tial Q and the Turbosmart Race Port don't belong on a car with a stock turbo, smaller BOV's like the Turbosmart Vee-port, the Turbosmart Type 5, Turbosmart Kompacts, Synapse DV, HKS SSQV, Go Fast Bits TMS Respons, and a few others are what you should be running.

If you are upgrading to a turbo kit like the MAP, CPE, FFTEC kits a bigger BOV is recommended with the proper spring. Simply measure your vacuum at idle and pick the proper spring based on the manufacturers spring chart.

 

[stormtrooper]

Well will any of those other BOVs work in place of where the the stock place is. And ir the cold side? Cause idk if i can get a block off plate for the cold side

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[Tune+]

Well will any of those other BOVs work in place of where the the stock place is. And ir the cold side? Cause idk if i can get a block off plate for the cold side

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The factory location is the hot side, what you have is on the cold side. Nothing will fit directly in place of your Tial. Also, none of the ones I mentioned will fit in the factory provision. All the ones I mentioned will have to be welded onto the charge pipe.

 

[stormtrooper]

Well wtf man!! That doesnt help me one bit!!! Lol. The stock ine kept surging on me as well. Lol. Deff aint going back to that on.

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[Apwrx]

Does it blow off normally under boost?mine does that when i let off after brake stalling in gear very low boost.Under full throttle or 3/4 let off its fine. If it was doing that under boost I'd worry,if not its fine.iam running maps charge pipes and ts bov Fwiw.People freaking out over nothing IMO.

 

[Evolvd]

Go with a lighter spring, the TiAL bovs are notoriously tight and are better suited for high psi's.

 

[stormtrooper]

Go with a lighter spring, the TiAL bovs are notoriously tight and are better suited for high psi's.

It's got a 6lb spring in it now. Lol

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[stormtrooper]

Does it blow off normally under boost?mine does that when i let off after brake stalling in gear very low boost.Under full throttle or 3/4 let off its fine. If it was doing that under boost I'd worry,if not its fine.iam running maps charge pipes and ts bov Fwiw.People freaking out over nothing IMO.

Well here's a video of under moderate boost. [ame]https://vimeo.com/142964768[/ame]

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[Evolvd]

Now that I watched the video that IS NOT compressor surge...that is the BOV fluttering, probably due to a weak vacuum pressure source. Where did you tee the reference air for the TiAL? Should be off your fuel pressure sensor hose downstream of the solenoid.

You'll know compressor surge when it happens because your turbo sounds like its "Chuffing" or imagine a scuba regulator and the sound it makes when breathing out.

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