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BOV position

mattysaidso

By mattysaidso,
in Engines & Forced Induction

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doridori32 Rising Star

doridori32

Posted
Posted
I have some articles on rally cars, they never mention specifics of ancillaries though...manily drivetrain and aero changes etc etc.  Plenty of pics of engines though, and i have found it tough to find what may look lik e a BOV...i know the Grp N rally cars do.

LOL...someone will freak when i install a 2nd BOV on my car:)

Your wasting your money Troy.. honestly.

Remove the BOV and get it tuned with a proper ECU :kick:

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R31Nismoid Grand Master

R31Nismoid

Posted
Posted
I cannot honestly be botherd anymore... my facts are correct.

So its about two pages now and your still here?

Just like in some other threads youve made posts in ... where you have suddenly gone quiet...

Oh wait... i found another

I suggest now is a good time to maybe think before you post eh?

And seeming that you know sooooo much about a lot of things (supposedly)

You dont know a tuner in your vast expiriances?

i mean... really.

Sydneykid Grand Master

Sydneykid

Posted
Posted
get it tuned with a proper ECU

I am not one for put downs, it's simply not my style. But sometimes I make an exception....

1,100 ps at 29 psi and 8.45 for the 1/4 at 165 mph.

VMaxSig.jpg

And it uses a POWER FC, maybe you are the one who should get your car tuned with a PROPER ECU! :Bang:

slideways926 Apprentice

slideways926

Posted
Posted

Just regarding the big BOV sh!te fight that seems to be going on....

Correct me if I am wrong (which I may well be) I was under the impression that the purposes of a blowoff valve were:

1. By releasing the manifold pressure either to atmo or back to the intake before the turbo, it prevented the pressurised air rushing back past the compressor wheel, slowing down the compressor wheel when the throttle is lifted. I imagine the result of this would be that the turbo would get back on boost quicker after a gear change due to the turbo spinning faster than it would have been if the pressurised air had all gone back out thru the turbo.

2. Since most braking systems that I have seen rely on vacuum from the motor, I would have thought that a BOV would help get the manifold back to a vacuum quicker, which would benefit for hard braking, say when you lift the throttle off?

As I said before, correct me if I am wrong. I dont profess to know everything.

brett_32i Explorer

brett_32i

Posted
Posted

slideway, the vacuum isnt effected as booster is taken from engine side of butterfly. bov is turbo side of butterfly and has no vacuum when throttle is shut. but you are correct in item #1.

and pnblight stated "And someone tell me how a bov is for emissions is has no benefits for emission at all" well someone allready posted that it was to stop overfueling in afm fitted cars.

now doridori, everyone else is posting positive getting people to think differently with constructive information. you just want to shitcan everyone that doesnt share your opinion.

please post constructive and politely or dont post at all.

Roy Grand Master

Roy

Posted
Posted
...The sound is not caused by 'vibrations at the turbine blades'. The turbine blades are on the exhaust side, first of all, and second of all, there is no evidence that these vibrations are sufficient to cause any damage. You don't need much vibration to get fan blades to chop up sound. Tell him to go to his electric cooling fan in his house and yell into it. The sounds chops up. Now see if the fan comes loose and starts spinning around the room because he yelled into it....

Your friend misses the point with that statement of the household fan.

What happens when the rpm changes? Switch the thing on / off and you will see the fan balde moved back and forth on the shaft. Now imagine the bearings in the turbo spinning at 100,000+rpm and with the sudden increase in inlet tract pressure and change in rpm ,consider the axial loads the bearings must endure:(

That example perhaps makes what i was trying to explain clearer, in the change in rpm makes the compressor/turbine moveback against the backing plate, not great for bearings:(

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