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View Full Version : Gt4's and bovs...



mick.wheelz
08-19-2009, 04:18 AM
Does a 5th gen have a bov/release valve from stock?

having pulled one apart, i couldn't find one, or anything that resembled one... if they don't, how do the fight compressor surge?

vip09
08-19-2009, 04:45 AM
NO, they don't.

donteatbugs
08-19-2009, 04:58 AM
there isnt much surge in stock form. ie. 10psi and tmic

andy
08-19-2009, 05:06 AM
not enough air in the system to cause any type of harmful compressor surge. If you go front mount IC you deff need one. a recirc one.

ChrisD
08-19-2009, 05:08 AM
i'd argue a BOV is a good mod for any 3sgte, even in stock form.

Mafix
08-19-2009, 02:01 PM
agreed.

donteatbugs
08-19-2009, 03:42 PM
its good but not necessary until you either turn the boost up or increase the volume of charged air in the ic setup.

Freshnicity
08-19-2009, 06:35 PM
Would it be better to do..recirc or vented on the stock TMIC

T-spoon
08-19-2009, 06:37 PM
its good but not necessary until you either turn the boost up or increase the volume of charged air in the ic setup.

Debatable. I'd bet they increase the life of a turbo regardless of boost. I had a 120k mile (or less, I'm not sure) 2nd gen turbo grenade messily. Would a BoV have extended the life? I don't know for sure.. would it have hurt it more? Definitely not. I can't think of a turbo car Toyota did not put some kind of BoV/Bypass valve on after '93.

Smaay
08-19-2009, 09:55 PM
you need to do recirc unless you get rid of the AFM. that air is metered already and if its released to the air, the car will run rich and could stall

DudeMan
08-19-2009, 11:31 PM
I could always hear compressor surge before I installed my BOV.

joe's gt
08-20-2009, 02:44 AM
+1 for BOV helping to prolong turbo life. Especially on a jdm ecu.

Sang
08-20-2009, 05:53 AM
+1 for BOV helping to prolong turbo life. Especially on a jdm ecu.

Would like to hear why you think a jdm ecu correlates to having a bov?

T-spoon
08-20-2009, 06:47 AM
you need to do recirc unless you get rid of the AFM. that air is metered already and if its released to the air, the car will run rich and could stall

Driving style will effect this. If you leave load on the engine after letting off the gas, you can drive such a car that would otherwise stall without stalling, and many just don't have any predisposition to run poorly. I wouldn't say that recirc is NEEDED for use with an AFM, although obviously it's better for efficiency etc.