To Blow Off Valve or not to Blow Off Valve??

[TEGZOTIC]

wtf,, 80 to 400 buks for a turbo eng certificate, thats NOTHIN... if thats the case who wouldnt do that then. last time i looked into it, it was over 1000buks to get it engerneerd in melb.

[aimre]

Bov are used on factory cars (plumbed back to meet adr) to eliminate lag between gears from the throttle being snapped shut and pressure being applied to the compessor blades .
It is for performance only ,it does not kill the turbo not to have one.

Or to eliminate noise, or pass emissions.

There are a few reasons why they do it. Read what i posted before.

Also if u change fast enough, u can actually get a boost spike. Due to the throttle closing and the turbo still compressing for a second. When the throttle opens again, all the still compressed air in the piping rushed into the intake manifold, u can get like 2 psi spike, so u get no lag at all.

[aimre]

who said they don't?
lol.

well depends on what race car.
look at the japanese ones.
lol.

yeah ok, Lets look at a jap car

http://youtube.com/watch?v=roLBHcw8eKA




O look, here a concept car, so no ADR to adhere too

http://youtube.com/watch?v=bR96aWfpWN0

from TopGear, although jeremy incorectly describes whats going on

[kazam]

lol that S2000 got pwned

and that P2 is insane

[aimre]

wtf,, 80 to 400 buks for a turbo eng certificate, thats NOTHIN... if thats the case who wouldnt do that then. last time i looked into it, it was over 1000buks to get it engerneerd in melb.

400 is just to get it looked at once. If for some reason u dont pass, the price only goes up. So it might end up $1000

[Lukezen27]

yeah ok, Lets look at a jap car

http://youtube.com/watch?v=roLBHcw8eKA




O look, here a concept car, so no ADR to adhere too

http://youtube.com/watch?v=bR96aWfpWN0

from TopGear, although jeremy incorectly describes whats going on

Hm now I've heard that sound I like it

Sounds mean

[DLO01]

I asked a turbo manufaturer/repairs workshop some questions in regard to Bov's and thier effect on Turbos. Hope this clears up any misconceptions or myths that we may have. This is their response:

I asked **** here the same questions as you've asked me, and although he has seen no 100% positive sign of damage due to no BOV, he still recommends using one for over 10psi of boost pressure when using a Ball Bearing turbocharger.

As for the BOV helping keep the turbocharger spooling, I can definately say this works, as turbocharger reversion would definately cause the turbocharger to reduce spool speed quite rapidly. There may only be a small difference in response time, but there is definately a difference.

[aimre]

I asked a turbo manufaturer/repairs workshop some questions in regard to Bov's and thier effect on Turbos. Hope this clears up any misconceptions or myths that we may have. This is their response:

I asked **** here the same questions as you've asked me, and although he has seen no 100% positive sign of damage due to no BOV, he still recommends using one for over 10psi of boost pressure when using a Ball Bearing turbocharger.

As for the BOV helping keep the turbocharger spooling, I can definately say this works, as turbocharger reversion would definately cause the turbocharger to reduce spool speed quite rapidly. There may only be a small difference in response time, but there is definately a difference.

But im saying without a bov, u can get a spike between changes, so ull never actually fall out of boost.

Try it one day, remove ur bov, and eye ur boost gauge while changing gears

[DLO01]

Thats ok, I was not targeting anyone. Would never do that. Everyone has thier own opinions.

Just wanted to ask questions to the people that actually repair turbos to see thier thoughts.

Just wanted to share the info with everyone.

[Aza]

i no when my old bov was jammed i had major problems honestly why wouldnt u BOV it, its not like its expensive, and it can be done legally. at least then u dont have to be paranoid about it.

[Sexc86]

i just find it amazeing that different states have these outragous prices for mod plates i mean $1000!!!! wtf do they do?

but i guess we have to pay $2200 for prestige number plates where as in vic its only $400.00 go figure dam goverment and their "non profits"

[aimre]

i no when my old bov was jammed i had major problems honestly why wouldnt u BOV it, its not like its expensive, and it can be done legally. at least then u dont have to be paranoid about it.

Becos its another thing that can go wrong. I dun wanna be driving and the piston get stuck in the up position, or it simply just leaking.

What major problems did u have. Ther are hundreds of cars running no BOV and they go fine