[924845192@qq]

hi，have someone used GFB DV＋？Will there be a fault code? Does the main spring need it?

[xxMike61]

i did mine with big spring installed. no codes

[Tejay75]

No codes without the spring either.

[xxMike61]

Yeah from what I read, the big spring is completely optional. It just changes how fast the air is released I think. But the DV sounds different with and without big spring for sure

[TheGoodTheBadTheUgly]

Originally Posted by xxMike61

Yeah from what I read, the big spring is completely optional. It just changes how fast the air is released I think. But the DV sounds different with and without big spring for sure

Damn I am installing this probably in the upcoming week, since my DV is probably dead. I am planning to use the big spring as well since it's seems like a more responsive and adaptive way to let excess boost out.

Are you able to describe ne how the sound is different? Because right now I have a compressor surge and it sounds like a BOV chirping so I just don't want to mistake that with the DV+ if it sounds anything close to it!

[maddmatth]

Originally Posted by TheGoodTheBadTheUgly

Damn I am installing this probably in the upcoming week, since my DV is probably dead. I am planning to use the big spring as well since it's seems like a more responsive and adaptive way to let excess boost out.

Are you able to describe ne how the sound is different? Because right now I have a compressor surge and it sounds like a BOV chirping so I just don't want to mistake that with the DV+ if it sounds anything close to it!

Personally, I haven't noticed any different sound from it
Can't hear any chirping/fluttering-like sounds.
Pretty sure it's installed with the main spring, that's what I requested from the mechanic.

[xxMike61]

With main spring - DV lets the air out slowly so being on and off the throttle is more responsive.

Without main spring - dumps the air completely whenever you let off throttle

Both hold boost the same but just the what happens when you let off throttle changes with/without big spring

[924845192@qq]

Originally Posted by xxMike61

With main spring - DV lets the air out slowly so being on and off the throttle is more responsive.

Without main spring - dumps the air completely whenever you let off throttle

Both hold boost the same but just the what happens when you let off throttle changes with/without big spring

I am worried about using the main spring. Will there be a fault code after a while? What is your car model?

[maddmatth]

Originally Posted by 924845192@qq

I am worried about using the main spring. Will there be a fault code after a while? What is your car model?

I've had it for over a year and no code has come up.

[xxMike61]

Originally Posted by 924845192@qq

I am worried about using the main spring. Will there be a fault code after a while? What is your car model?

Nope I ran it hard after the install and no codes came up after. I have a 11 335i e92

[924845192@qq]

Originally Posted by Tejay75

No codes without the spring either.

Without the main spring effect will be bad?

[TheGoodTheBadTheUgly]

Originally Posted by 924845192@qq

Without the main spring effect will be bad?

Effect of the DV? Not really. Without the main spring it acts exactly like the stock diverter valve, which is it will always be fully open whenever it's purging extra boost whatever the pressure and quantity it is purging (After throttle and boost was built). Whilst with the main spring it progressively opens to purge in function of the applied pressure and debit of extra boost. Do you understand a bit?

[Jeff@TopGearSolutions]

We haven't heard any instances of codes when installing correctly and we've sold quite a few of these.

[Turbod]

Originally Posted by maddmatth

Personally, I haven't noticed any different sound from it
Can't hear any chirping/fluttering-like sounds.
Pretty sure it's installed with the main spring, that's what I requested from the mechanic.

How much boost are you running? I really didn't hear much at 15 psi or less. When you're at 18 or 20 psi it is noticeable.

[bbnks2]

I never heard any new sounds but I have stock intake still..

What I did notice was the car holds boost better in on/off throttle situations. I also like the piece of mind of never having to worry about the factory rubber diaphragm ripping or leaking boost. It's a cheap mod. Do it.

[Turbod]

Originally Posted by bbnks2

I never heard any new sounds but I have stock intake still..

What I did notice was the car holds boost better in on/off throttle situations. I also like the piece of mind of never having to worry about the factory rubber diaphragm ripping or leaking boost. It's a cheap mod. Do it.

I have the Pure inlet and the BMS intake and it sounds like a Supra flutter when letting off the throttle under high boost. It is much more satisfying than the little hiss of the stock DV if you're into that kind of thing. Something to keep in mind is I added mine with the PS2 so some of that different could be attributed to the turbo upgrade.

[TheGoodTheBadTheUgly]

Originally Posted by Turbod

I have the Pure inlet and the BMW intake and it sounds like a Supra flutter when letting off the throttle under high boost. It is much more satisfying than the little hiss of the stock DV if you're into that kind of thing. Something to keep in mind is I added mine with the PS2 so some of that different could be attributed to the turbo upgrade.

Really, the inlet? You're right probably the PS2 turbos. I really think the open cone intake would make the big difference in sound since it not boxed of anymore and you could hear the DV purge clearer, on stock turbos at high boost. Or maybe there is just not a big sound change on the stock turbos.

[Torgus]

fwiw you really want you BOV to open as fast as possible to vent as much air as possible as the TB shuts and you have no where for your boost to go but back.

[maddmatth]

Originally Posted by Turbod

How much boost are you running? I really didn't hear much at 15 psi or less. When you're at 18 or 20 psi it is noticeable.

Stage 2 + so it hits about 18 psi yes, but hitting that boost level means I'm driving with foot to the floor so between engine revs, exhaust pops, tyre noise... it's probably drowned out

I'd imagine it's much more noticeable with a manual, you probably hear it on gear changes because you have to take your foot off the throttle and it lets off some boost there.
On the DCT all I get on gear changes is a pop or crack, occasionally accompanied by some wheelspin

[924845192@qq]

Originally Posted by TheGoodTheBadTheUgly

Effect of the DV? Not really. Without the main spring it acts exactly like the stock diverter valve, which is it will always be fully open whenever it's purging extra boost whatever the pressure and quantity it is purging (After throttle and boost was built). Whilst with the main spring it progressively opens to purge in function of the applied pressure and debit of extra boost. Do you understand a bit?

If you have a main spring ，when at high speed shifts, will lose less pressure？Would it be better than no main spring?

[TheGoodTheBadTheUgly]

Originally Posted by 924845192@qq

If you have a main spring ，when at high-speed shifts, will lose less pressure？Would it be better than no main spring?

Absolutely! The way the OEM Diaphragm DV works is it will fully open, dump all of the excess boost which means you will have to rebuild boost in order to reachieve peek boost after your shift.

Now, what happens with the DV+ and the main spring is that the whole DV is electronically activated, just like OEM, but the purge valve is activated pneumatically because of the main spring and other components. So this only lest excess boost exit bit by bit. Like only what needs to be purged will be purged and not more. This means that after your gear shift, with the boost that it retained, you get to peek way faster since you don't have to rebuild it all.

Found an interesting video that explains it all. It's for a MK.5 Golf GTI but it's almost exactly the same thing as our car since the stock DV is also a diaphragm type.

[Jeff@TopGearSolutions]

Originally Posted by TheGoodTheBadTheUgly

Absolutely! The way the OEM Diaphragm DV works is it will fully open, dump all of the excess boost which means you will have to rebuild boost in order to reachieve peek boost after your shift.

Now, what happens with the DV+ and the main spring is that the whole DV is electronically activated, just like OEM, but the purge valve is activated pneumatically because of the main spring and other components. So this only lest excess boost exit bit by bit. Like only what needs to be purged will be purged and not more. This means that after your gear shift, with the boost that it retained, you get to peek way faster since you don't have to rebuild it all.

Found an interesting video that explains it all. It's for a MK.5 Golf GTI but it's almost exactly the same thing as our car since the stock DV is also a diaphragm type.

Good find