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Bov Causing Shudder

conan7772

By conan7772,
in Four Door Family & Wagoneers

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Ben C34
Ben C34

There's tinkering and then there is f**king around.

R31 POWER
R31 POWER

Turn your speakers down before listening hahaha. Sounds like thunder or a bomb going off when it opens.

Artwear
Artwear

Is it just me or has this thread gone full circle a few times? The best way to avoid shutter from an aftermarket bov is to tune to match or keep the stock one and avoid the shutter, is that pretty mu

Posted Images

conan7772 Mentor

conan7772

Posted
  • Author
Posted

AAAARRRRRGGHHHHHHHHHHHHHH

Just got my new Greddy BOV FV.

This came out of it.

Really rough inside, cut your finger easy.

Valve is very very hard to push in by hand, even when sucking on it.

Retainer ring on the bottom isn't gold.

Silicone tube doesn't have Greddy logo on it and is smaller OD.

You know what I'm getting at.

Seller more than happy to refund and pay for return postage.

Phew.

Ok Scotty, I'll wait for the tune mate.

post-25026-0-99050300-1449634334_thumb.jpg

post-25026-0-38863800-1449634350_thumb.jpg

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YangLIU Rising Star

YangLIU

Posted
Posted

AAAARRRRRGGHHHHHHHHHHHHHH

Just got my new Greddy BOV FV.

This came out of it.

Really rough inside, cut your finger easy.

Valve is very very hard to push in by hand, even when sucking on it.

Retainer ring on the bottom isn't gold.

Silicone tube doesn't have Greddy logo on it and is smaller OD.

You know what I'm getting at.

Seller more than happy to refund and pay for return postage.

Phew.

Ok Scotty, I'll wait for the tune mate.

is it a genuine Greddy? how much did you pay for that? at least, it should not cut your finger.

you need go for Greddy soft spring, plumb back adapter also. but you can't get rid of pigeon sound unless you tune the car.

conan7772 Mentor

conan7772

Posted
  • Author
Posted

is it a genuine Greddy? how much did you pay for that? at least, it should not cut your finger.

you need go for Greddy soft spring, plumb back adapter also. but you can't get rid of pigeon sound unless you tune the car.

I'm pretty sure it's a fake.

No way I'm fitting it with metal shards coming off.

Greddy website has a warning on the RS models.

This FV has all the same things wrong/ different as in the pictures.

Paid $97 including Nissan adapter plate.

Others are selling it for $360

Don't say it

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Scott. What's your take on bov vs no bov for response and making boost?

I've tried a few, standard, blitz etc. and have found they all leak and in return partial to half throttle suffers.

The stock BOV with a grubscrew was ok, bit of hesitation as you come off boost to a cruise.

Once I changed to the Turbosmart Kompact plumback I never had an issue.

Personally I only use a BOV blanking for diagnosing faults, I would never block it off for any high boost runs, there is a good chance you will twist the turbine shaft or damage the compressor wheel.

BoostdR Mentor

BoostdR

Posted
Posted

We have run no BOV on all our non Borg Warner EFR equipped race cars with no adverse effects. Having said that I won't do it on my stag as the compressor stall sound is so loud it's embarrassing.

Blocking the OEM bleed hole makes surge worse but improves spool, so you have to make your choice.

Sounds like the Kompact is a good unit.

BoostdR Mentor

BoostdR

Posted
Posted (edited)

Oh, update on my 33gtr BOV. It improved surge due to a softer spring but it bleed air due to intake oscillations....which is what I expect causes the surge. I moved the BOV sense line to the fuel reg output further up the plenum which helped a little bit.

Running a modded Rb25 BOV atm. Seems the same as the M35

Edited by BoostdR
Trex Grand Master

Trex

Posted
Posted

The stock BOV with a grubscrew was ok, bit of hesitation as you come off boost to a cruise.

Once I changed to the Turbosmart Kompact plumback I never had an issue.

Personally I only use a BOV blanking for diagnosing faults, I would never block it off for any high boost runs, there is a good chance you will twist the turbine shaft or damage the compressor wheel.

Thanks. I'm a bit worried about the turbo at high boost. But not willing to sacrifice my cruising response for it.

Philr32 Proficient

Philr32

Posted
Posted

The stock BOV with a grubscrew was ok, bit of hesitation as you come off boost to a cruise.

Once I changed to the Turbosmart Kompact plumback I never had an issue.

Personally I only use a BOV blanking for diagnosing faults, I would never block it off for any high boost runs, there is a good chance you will twist the turbine shaft or damage the compressor wheel.

Are you using the normal one designed for Nissan not the dual port Scotty? I thought everyone was having issues due to it not being adjustable? Or did you get a softer spring or is it a non issue because yours is tuned?

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Yes Phil, you can buy different springs for them, but I bolted mine straight on and it worked well out of the box. I guess the tune is compensated nicely, although I suspect it has a lot to do with the design of the 3 inch intake too and how the return is plumbed back in.

Ben C34 Grand Master

Ben C34

Posted
Posted

I couldn't decide which colour to go for so I've decided to keep both and twin turbo the VQ25DET

That should get rid of the shudder

Australias first twin turbo M35

They aren't turbos. ?
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