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Blow off this valve

This is a discussion on Blow off this valve within the Kill Stories forums, part of the Racing Forums category; Originally Posted by sfletch2000 GN's don't have blow off valves, i have a te-62 on my car. Once you go ...

  1. #21
    General Mota's! stevegrizzle's Avatar
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    mid blue
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    Quote Originally Posted by sfletch2000 View Post
    GN's don't have blow off valves, i have a te-62 on my car. Once you go any bigger than that you want one on there. And the pressure gets released back through my 9" k&n. You can hear it when you let off the gas.
    Which means compressed air is traveling backwards through your compressor. This is bad for turbos, regardless of size, psi, ect..... (alothoug more psi will obviously cause damage moe quickly)

  2. #22
    Member sfletch2000's Avatar
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    86 Buick Grand National
    02 WS6-M6 407 RWHP

    Yeah i know its not the best for the turbo but i have friends that ran there's without a blow off valve for years with out any problems. Your right when your running race gas and 28 psi it definately aint good for it.

  3. #23
    Rodzilla Tha Cavity Filla zero_proto's Avatar
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    99 Z28 with an SS complex

    yeah not all cars have bov's my buddy had an xr4ti without one, he swapped out to a larger turbo and when he would let off you can here the turbo backing up, that car did not last long, and the reason you can't hear the factory cars is because the pressure is recirculated back in not vented into the atmosphere.

    If you heard a v8 with a bov, it would be scary.

  4. #24
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    My girlfriends cousin have a 351 in his mustang that is cammed with heads forged internals stand alone fuel system and turbo with a frount mount with a wastegate it sounds so sick also makes 625rwhp lol.

  5. #25
    BAHHBYE Stone's Avatar
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    06 PBM GTO(458WHP)SOLD!!
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    Quote Originally Posted by zero_proto View Post
    yeah not all cars have bov's my buddy had an xr4ti without one, he swapped out to a larger turbo and when he would let off you can here the turbo backing up, that car did not last long, and the reason you can't hear the factory cars is because the pressure is recirculated back in not vented into the atmosphere.

    If you heard a v8 with a bov, it would be scary.
    My buddy has a 383 stroker in a 96 Camaro SS with a Turbonetics 76mm turbo.....made 790whp and almost 900 trq.....its a sleeper....untill he mashes it!

  6. #26
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    Yeah good times

  7. #27
    Member Redegal's Avatar
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    Quote Originally Posted by JunkyardTurbos View Post
    The pressure doesn't stay in the block. It backs up between the throttle blade and the compressor. It will follow the path of the least resistance trying to escape, be it by popping off an inlet tube, or backing out through the compressor.

    If the pressure backs out through the compressor, it will damage the turbocharger over time. You don't need one, but it saves the turbo and keeps it spooled when the throttle blade slams shut.

    Mine sounds like ass, but I don't have it for the sound.
    +1
    The waste gate is what keeps too much boost from entering the engine. It bleeds boost off into the exhaust. My Regal doesn't have a blow off valve. When I let off the gas pedal, the throttle plate slams shut and boost gets backed up in the inlet pipe. It doesn't hurt anything it just makes a funny echoing noise thorugh the air filter. I guess overtime it could damage the turbo however.
    Last edited by Redegal; 06-19-2007 at 04:53 PM.

  8. #28
    Member sfletch2000's Avatar
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    86 Buick Grand National
    02 WS6-M6 407 RWHP

    Nice turbo t you got there, what kind of times you runnin in that thing? And when you let off the gas on turbo regals it does sound like shit, kinda like a sneezing sound.
    Last edited by sfletch2000; 06-20-2007 at 11:58 AM.

  9. #29
    Member Redegal's Avatar
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    Thanks, the last time I was at the track I got a 12.0@112 three times in a row. It was a pretty cold night just about 40 degrees F. I'm going back this Friday night and hope to get into the 11's. I'd post a pic but they come out too small for some reason?
    Last edited by Redegal; 06-20-2007 at 04:40 PM.
    2002 SS M6 Convertible

  10. #30
    Member sfletch2000's Avatar
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    86 Buick Grand National
    02 WS6-M6 407 RWHP

    What mods do you have?

  11. #31
    Member Redegal's Avatar
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    I got a Precision GT3255, CASV4 intercooler, 60 lb injectors, Walbro 340, 2004R built by CK performance, stock converter, CAI, Ramchargers dual fans, razor's PAC alky kit, 3" THDP, 2 1/2" Hooker cat. back with 275/50 MT DR's out back. I also have an air bag on the right side.

    When I ran my 12.0 I was using 93 Octane and the Alky with a 98 Extender chip. My best 60' time that night was a 1.645 (not bad for cold pavement I guess).

  12. #32
    Senior Member BLKCLOUD's Avatar
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    I had a twin turbo setup on my old 88 Mustang 5.0 for a while. Very mild setup, only 8 psi, made 460 RWHP. No blowoff valve.

    I definetly get a chuckle out of folks that just want others to 'hear' their BOV. I typically just laugh.

  13. #33
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    Twin turbo on that car would be a waste of time you could make the same power with single turbo.

  14. #34
    no more 4th gen secondgearscratch's Avatar
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    Quote Originally Posted by 2000T/A Guru View Post
    Twin turbo on that car would be a waste of time you could make the same power with single turbo.
    actually having a twin turbo setup greatly reduces lag, detonation, and engine temperatures. its also less stressful on the set up as it isnt running high boost on one large turbo.

  15. #35
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    I really dont have a problem with any 3 of those thing you jsut listed on my single turbo setup and the car makes 507rwhp.

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    Quote Originally Posted by 2000T/A Guru View Post
    I really dont have a problem with any 3 of those thing you jsut listed on my single turbo setup and the car makes 507rwhp.
    how would you know if it was stressful on it or not? and how much boost do you run, and whats your compression ratio?

  17. #37
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    Something really would have broke by now if it were that stressful, just started running 21psi on 8.5 to 1.

  18. #38
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    Quote Originally Posted by 2000T/A Guru View Post
    Something really would have broke by now if it were that stressful, just started running 21psi on 8.5 to 1.
    thats a low compression ratio to start with is why you dont have any problems. that sounds pretty sweet though. turbos are bad ass.

  19. #39
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    Well yeah but a 88 mustang probably only has 9 to 1 at the most, all i was saying is that the twin turbos arent needed, the setup just costs more. My GFs cousins 5.0 runs 9psi and makes 575rwhp and his high boost is 12psi his comp ratio is 9 to 1 which he makes just over 600rwhp i believe.

  20. #40
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    Quote Originally Posted by 2000T/A Guru View Post
    Well yeah but a 88 mustang probably only has 9 to 1 at the most, all i was saying is that the twin turbos arent needed, the setup just costs more. My GFs cousins 5.0 runs 9psi and makes 575rwhp and his high boost is 12psi his comp ratio is 9 to 1 which he makes just over 600rwhp i believe.
    it all depends on the size of the turbo. but i agree with you for the most part. i certainly dont have the time or money to fabricate a twin turbo setup, just more hell to pay in the long run, especially since doing things yourself is always a lesson in shoulda woulda coulda.

    oh well, i want turbo spool.

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