What if I can the car without a bov?

[John Mark Dongon]

I see on YouTube some people running their cars without a blow off valve. What's the pros and cons?

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[dustyboner]

you pretty much have to have the blow off valve. If not you would have compressor surge like fck and it would kill your turbo.

 

[ThunderChild]

It can and has been done, even on factory cars like early Toyotas.

The benefits of keeping one far out-weigh reasons to remove it, and the positives of running without one is speculative at best.

It's a safety piece. Would you run your oil pump with no bypass system on it? How about your fuel system with no regulator? It's a similar system for the BOV/BPV, it protects the turbo from overpressure once the throttle closes. You might be able to get away with a low CFM, low boost/stock style setup with some cars, but once you get to the high boost, big turbo game, you're going to want one so you don't destroy a turbo, throttle plate, intercooler or intake manifold.

Bottom line: there's no deficit to having one that's set up properly, and many issues probable without one.

 

[1990TSIAWDTALON]

Both guys have pointed out the reason you need to keep it, safety.
Just think of 40 lbs of boost, flowing 60+ lbs/min all of a sudden hitting a brick wall as I close my throttle plates from a full pull. That boost HAS to go somewhere, the BOV lets it escape.

 

[K_81_K]

100% its needed
Will cause so many issues/damage without it!
cost of a good bov setup vs potential damage and repairs....

 

[rEclipserGST]

Replace that pos plastic 2g one and get something better. I bet you wouldn't be asking this question if you had a nicer one already.

 

[Bud92gsx]

To elaborate on thunder clouds post.
I believe it was the toyota celica alltrack. It did come factory with no blow off/ diverter valve. I think it was running running like 5 lbs of boost, I dont know what turbo but I'm sure it was tiny.

 

[tstkl]

The starion never had a blowoff valve either.

To the original poster: run a blow off valve.

 

[ThunderChild]

To elaborate on thunder clouds post.
I believe it was the toyota celica alltrack. It did come factory with no blow off/ diverter valve. I think it was running running like 5 lbs of boost, I dont know what turbo but I'm sure it was tiny.

^^

But yes I believe you're correct it was the Celica alltrac, iirc they had a ct26. I don't recall of the ct20 was ever used.