Quote:
Originally Posted by Anthony1s
I'm not saying you'll get a CEL from venting to atmosphere. I'm saying the DME will recognize different diverter valve function and interpret it as a malfunction and issuing a CEL. It is possible a CEL can happen due to venting too much boost off at once, but that wasn't what I was implying. The DFB DV+ does this and offers a different configuration to prevent the CEL. Turbosmart is only available in one configuration and doesn't mention anything about the CEL.
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No CEL for me and I've been running the Turbosmart Dual Port since last September with BMS Air Intake. Coming up to 6 months.
Turbosmart has two options, a full recirculating option, and a dual-port option which releases SOME of the air to atmosphere, I doubt it's releasing much, it makes a hard sound but that's probably due to the design to make the sound, rather than dumping heaps of air out of the system.
And of course there is turbo leak, have you played around with the stock Pierburg valve? The end of it that seals is a rigid floating plastic seal, the turbosmart product seals completely with billet and a rubber O-ring at the end to make a complete seal, and the metal piston sits recessed inside.
To me the evidence is clear that my stock DV was leaking boost even though I originally bought this for the noise. Turbosmart never sold this to me under the pretense of extra power, but the before and after dyno run showed increased max power and the turbo kicking in harder from 4,000rpm according to multiple dyno runs. The boost difference at 4,750 rpm was 12.7psi fairly costantly over and over on stock DV versus 13.5psi at the same RPM's over and over with the Turbosmart unit installed.
The lag is definitely 100% improved, the stock DV in my case was definitely leaking boost and I had no idea until the part was replaced with something better.
As I mentioned in my previous post, to me the after install throttle response is improved. I get what your saying about the dual-port losing some air and in theory, should be less responsive, but you do know in different driving modes the DV opens and closes at different times. What I've noticed is the valve opens and vents to atmosphere the most in MDM or comfort mode. In Sports+ the valves (stock or aftermarket) hardly open and when they do, it's closed quickly. I'm driving a DCT, maybe this is why I'm not noticing reduced throttle response and in fact seemingly improved throttle response probably because my boost curve has been brought forward?
I'd expect there to be a bigger difference with manual cars simply because of it taking longer to shift gears giving the BOV more time to vent. In DCT going up the gears and not releasing your foot for gear changes means the valve isn't having to open at all anyway. Maybe? I guess? I'm not an expert, I'm just applying some logic and actual first-hand experience to this thread.
The other thing is how much air is being lost from the system? Is it enough to cause a NOTICEABLE effect in turbo responsiveness? Maybe on a test rig it can be measured, maybe at F1 level where 1:100ths of a second count, but in reality how many people have actually noticed a drop in responsiveness from vent to atmosphere versus full recirculation? I never have and I've been playing with turbo cars since the mid-1990s, my first car was an R33 GTR. I've been through a lot of turbo cars and never once felt the difference between vent to atmosphere versus recirculation.
Theory is one thing, but it's what actually happens in real life that counts.
In theory, a 911 isn't meant to work very well, drive a GT3 and tell me the theory of an engine hanging out behind the rear axle is meant to be a bad thing?
I've written a lot, someone is going to find a flaw in what I've written. But the reality is, however it does it, and whatever the theory says about it, it works great in reality. With increased power, earlier boost, great vent to atmosphere sound, in my case improved (or worst case the same) throttle response, and when I'm done with it I can put it on eBay and get most of my money back. I'm just grinning ear to ear.