Atmospheric V's Recirc DV

[Smith_S2]

I recently put an atmospheric DV on and the car and i noticed quite a difference between the standard 710N, that car pulled much more aggressively. I have changed back to a recirculating due to the pppppppppiiiiiissssssshhhhhhhhhht it was driving me nuts.

Now i have put a plumb black turbosmart recirc instead of the 710N and the car does not feel as powerful or pull as hard as as it did with the atmospheric.

One thing i did notice was the spring strength between the two turbosmart DV's. Atmospheric was very stiff and the recirc is much softer.

I think i'm losing boost through the DV, can i change the spring inside the DV?

[lind4hl]

yeah you should be able to do that.

IMO i would never run a car with maf with Open dump-valve btw. it messes up the signals to the ecu.

[Rusty]

It feels slow because it's much smoother. On a stock car an atmospheric DV gives a stutter when you apply the throttle so it feels like it kicks harder whereas in reality it's slower as it's running rich for a fraction of a second. Tried both, atmospheric felt like toss compared to a stock 710N but it did sound nice when you're giving it some beans Best effort if you need the noise is something like the GFB one I had where you can adjust the recirc % and thus noise level, I had it set so that it was about 90% recirc so it ran better and still gave a nice woosh (much quieter than 100% atmospheric)... still not as good as a full recir tho.

[Smith_S2]

Gfb? The recirc Turbosmart DV i have on just now is so quiet, it's great does not chitter like the 710N though!

[lind4hl]

Go fast Bits i think..

[sjw185]

tried turbosmart atmospheric DV vs New 710 back to back.
The turbosmart is far better, Stronger boost plus gauge showing slightly higher
Was sure my new 710 was passing.
Need to get on the rollers to see whats happening with fueling etc.
John is your TS recirc adjustable?

[Smith_S2]

tried turbosmart atmospheric DV vs New 710 back to back.
The turbosmart is far better, Stronger boost plus gauge showing slightly higher
Was sure my new 710 was passing.
Need to get on the rollers to see whats happening with fueling etc.
John is your TS recirc adjustable?

Yeah i have would in the Valve right down to the hardest setting. I'm on the hunt for a stiffer spring! The DV you have is fantastic IMHO. It's proper no boost then WAM BAM full boost.

[sjw185]

Yea didint get alot of testing done before I had to go offshore again
Just got mine set halfway at the moment, you could try running your new one atmospheric if you had a bung to see if it was passing?
Remember someone trying a forge or baily BOV round the other way with better results?

[Smith_S2]

Just got mine set halfway at the moment, you could try running your new one atmospheric if you had a bung to see if it was passing?
Remember someone trying a forge or baily BOV round the other way with better results?

Might be worth a try. The difference between my DV and yours is pretty big. You can push my valve in no problem with you finger even when wound in, but yours wound out all the way is so much stronger.

A good excuse to meet up and try out each others cars i reckon

Have a safe trip home when it comes!

[sjw185]

Will be back in a couple of weeks so if your still at home we can do some tests

[Rusty]

Go fast Bits i think..

Bingo. Cost a fortune but it was a super piece of kit, well designed, well made and did the job.

[GazzaG60]

gfb stuff is good. i use a gfb BOV. no issues.

some gfb have a nut to wind in some can be done by hand. made very well.

with bov's you certainly get what you pay for. think the DVs will be around 150 for a hand adjustable one.

[Rusty]

GFB has preload and recirc. hand adjust and can also be used with adaptors to change operation, noise and noise level! Very serious piece of kit and built like a tank:-

[Fat Audi 80]

Best thing to do is bring both types to the rolling road and do a before and after test...