GSRgrrls car is going to the exhaust shop this friday, and were having the wastegate dump tube plumbed back into the exhaust just before the cat.

Setup is a stock gsr, with a drag3 turbo kit. Drag manifold, tial 35mm wastegate. Factory ITR cat-catback.
She is only running .45Bar and doesn't plan on increasing boost anytime soon.
Will this change induce any boost spike, or other problems?

 

probably a fair loss in power..

 

nope you should be fine, just make sure you join them back as far as possible, just like you said.

 

I thought it had to be 18 inches in order for no power loss?

 

I would imagine a smooth transition would also help reduce power loss as opposed to the wastegate gases coming in at a 90 degree angle to the rest of the flow.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ivan &raquo;</TD></TR><TR><TD CLASS="quote">I thought it had to be 18 inches in order for no power loss?</TD></TR></TABLE>

I don't know where everyone came up w/ the 18" #, I think it just has to be far enough back to where it doesn't cause any turbulance w/ the air coming out of the turbo.

 

the 18" came from corky bells maximum boost at least that is where i got it but in that book he also promotes the **** out of that VATN turbo that supposedly turned out to be a failure

someone here should compile the archives in some sequence and write a book that would be a bestseller with all the opinion and bandwagon weeded out obviously

 

Well, So far there appears to be little/ no downside!
We can actually hear the vtec crossover again now, and no more MmmmmmmmBlaalalalalalalalalalalaa crap.
Closedloop-

 

How much did this cost Dion?

Pictures please...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DIRep &raquo;</TD></TR><TR><TD CLASS="quote">
I don't know where everyone came up w/ the 18"</TD></TR></TABLE>

I never read porky bells book, but I guess thats where it came from.
imo, the length before connecting will directly depend on the turbine.
I doubt he tested out the T3 & T4 turbines that we use, so the 18" is still debatable...

 

Yeah lets see some pizzics y0!

 

Is it better to run a open tube off the wastegate? Just have it run down not connect to anything? Please let me know

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Koticcivic4u &raquo;</TD></TR><TR><TD CLASS="quote">Is it better to run a open tube off the wastegate? Just have it run down not connect to anything? Please let me know </TD></TR></TABLE>

Makes for a much louder setup, some will argue running the WG as closed-loop will rob some power, but how much is debatable.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Quick 200k Mile Motor &raquo;</TD></TR><TR><TD CLASS="quote">

I never read porky bells book, but I guess thats where it came from.
imo, the length before connecting will directly depend on the turbine.
I doubt he tested out the T3 & T4 turbines that we use, so the 18" is still debatable... </TD></TR></TABLE>

the whole reason about the 18" is at 18" from the turbine housing, you'll have less turbulance with the exahust that is trying to get out of the turbine housing interfering with the exhaust gas from the dumptube off of the wastegate.

It seems that 18" is a medium distance, too close to turbine housing, you'll interfere the exhaust flow, which defeats the purpose of having larger exhaust to reduce backpressure, too far out in the DP, you may create a back log of exhaust trying to travel to the entrance in the exhaust.

Damn dude, you sure your name is not TZsir ? old joke...

stan

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Flamenco-T &raquo;</TD></TR><TR><TD CLASS="quote">

too far out in the DP, you may create a back log of exhaust trying to travel to the entrance in the exhaust.

stan</TD></TR></TABLE>

damn stan, i didn't know that...i thought you would be ok just going back as far as possible. i am already having my dumptube fabbed.

 

well, with everything, there are really nothing set in stone with majority of the setup. you have to use a little moderation with everything, it just comes in with trial and error.

18" is nominal IMO. I have only seen minimal loss to no loss of power at all, and spools up characteristic still stays the same

stan

 

Uploading some pics right now. Like Punk said, I haven't felt any loss of power, if anything the car sounds and feels a lot more stealthy. And I've noticed it running a bit cooler which is great.
It cost about 150, the guy is an old friend of D's from his shop days.
On the downside, the primary oxygen sensor crapped out. I borrowed one from Chris and the maintinance required light doesn't stay on anymore, haha. *Whew* I'll still need to buy a new one though. Acura dealerships are thieves.

 

 

the flexpipe on the dumptube
I was just thinkin about doing that, but I guess it would also work if the dumptube is welded before the main flexpipe..