Bov Causing Shudder

[Trex]

Read Scott's and dales posts again.

[conan7772]

yeah I get it but I'm not convinced.

stock BOV will affect spool time.

not an option for me..

[scotty nm35]

Yes it will. The shudder should be able to be sorted with a tune.

[conan7772]

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.

[YangLIU]

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.

[Reaperblitz]

It is hard to find genuine these days especially for those brands unless you can get it from an authorised distrubutor/ retailer.

[Trex]

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.

[conan7772]

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]

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]

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]

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 December 11, 2015 by BoostdR

[Trex]

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]

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]

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.

[conan7772]

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

[Ben C34]

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. ?

[scotty nm35]

Oh, you bought matching stall valves...

[Reaperblitz]

Umm.. they aren't both copies right..

[Lakes101]

They are vent to atmo though

[Reaperblitz]

Eh ...if youre gonna custom setup you're gonna have a custom ecu so vta doesn't matter