It supposedly bolts to the exhaust housing and has a flange that points downward and vents the wastegate to the atmosphere.





How do you think this will do again boost creep? Does it seem like it could vent more boost than the stock wastegate? They are portmatched.

Any negative effects anybody can foresee?

Thanks all.

 

O_O to the atmosphere??!?!? make sure you don't melt anything....

 

Very loud. The gas bypassed by the wastegate is unmuffled by the turbo.

CO poisoning might be a consideration. Exhaust pipes generally exhaust at the back of a car for a reason!

 

Boost creep will be the same, the bottleneck that creates the creeping is the entry to the wastegate and the actual size of the flapper, not the exist of the wastegate.

No negatives.. They sound cool, might give you a poofteenth of a HP more due to the fact it wont interupt flow from the exhaust wheel aswell.

 

hah,u beat me to it.

ive seen it on many dsm's.i think it will; work great.it wont bee loud if u doint get into the boost and let the wastegate open up.

im gonna do this to my car for the few weeks my car is running on the stock turbo.

 

Thanks for the replies. Anyboday want to share their take on this?

 

It does improve flow through both the wastegate and turbine, because the two flows don't mix inside the housing. This normally causes a lot of turbulence, restricting flow through both. I've seen a healthy dyno-measured power increase from fitting one to a S5 (can't remember the exact figures).

White_FC is right though, unless you enlarge the actual wastegate port itself, this will have no effect on boost creep. That wastegate pipe on that plate is also far too small. It'll defeat the purpose of porting the wastegate. It looks very well made, it's just too small.

It doesn't have to run open like that if you don't want the very loud noise it makes. I have a seperate pipe for the wastegate that connects back into the main pipe. I still haven't ported my wastegate yet (don't ask...) so I have yet to realise it's benefits.

 

Thank you. I was hoping you or one of the other very knowledgeable regulars would contribute.

So in short it helps the flow by creating less turbulence but does not do much for stopping boost creep unless the stock wg is ported and even then the pipe on the end of this thing is another restriction.

 

i'm pretty sure its that size due to space constraints but anyway that thing is mine and its FOR SALE!

 

All correct except for the last bit. The bend on the end would have very little restriction.

 

I had a set-up like that venting the stock flappers to the atmosphere.

I used a 2 1/4" hole in the backplate though that was tapered all the way around the inside to match the turbo inside casting. The larger contoured hole helps flow AND allows the wastegate flapper arm to open up inside it- so it is using the full throw of the WG actuator (doubles how far it opens).

Mine did help boost creep quite a bit, but it was annoying since the stock WG flappers leaked a bit even at idle. Constantly sounded like an exhaust leak. I tried putting a 2 1/4 downpipe on it w/ silencer, but this restriction caused more boost creep.

So, to summarize- good idea, but I don't like how small that wastegate dump is and I also don't like how the tube for dividing the turbine flow intrudes into the exhaust stream.