I am currently building my ls-t and I have found myself wondering where I am going to run my waste gate dump tube. Does the length effect performance? Also does the design of the tube effect the longevity of the W/G?

 

The length can effect performance in the aspect that if its not long enough and letting the exhaust completely exit the engine bay, that the turbo can suck that air back in. Obviously the hotter the air sucked in the more the less power the motor will be able to make...and exhaust gas is very very hot. The design will not effect longevity.

 

Just get the gas out of the engine bay. Most dt's reach just under the oil pan...

 

Ideally it should dump behind the oil pan to make sure it evacuates 100% of the exhaust gas.. but mine is just going to dump straight down. Just dump it as far away from the inlet of the turbo as possible.

 

Just make sure its routed towards the exhaust side and not the intake side of the turbo.

 

Ok, That makes sense. What about running it straight across to the drivers side fender. I have seen a few of these setups but im not sure where they dump.

 

You can do that, but i've seen a lot of black soot on the drivers side on setups like that. I would only do that if it is a track car.

 

just make sure that it is long enough to dump the exhaust gas outside of the engine bay. mine runs parallel to my downpipe and ends right around where my cat used to be

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wernhersey &raquo;</TD></TR><TR><TD CLASS="quote">Ok, That makes sense. What about running it straight across to the drivers side fender. I have seen a few of these setups but im not sure where they dump. </TD></TR></TABLE>

thats what im going to be doing for my next setup, I wont mind the soot to much, just a little wipe every couple of days and it should be fine.

Jay racing has a cool little "kit" : http://www.jayracing.com/index...ath=1

 

Somewhere there is a test where they dyno'ed before and after running a short dump and running a dump that extends to under the oil pan, the results showed a considerable gain with it extending down under the pan, mine seems to be ok and I ran it straight down and the tube ends about 1/2" lower than the oil pan sits.

As stated above keep it away from the turbo and further from the engine bay the better it will keep the exhaust gasses from being sucked up by the turbo inlet.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sp00led &raquo;</TD></TR><TR><TD CLASS="quote">You can do that, but i've seen a lot of black soot on the drivers side on setups like that. I would only do that if it is a track car.</TD></TR></TABLE>

I never even considered the fact that there is exhaust gases dumping out of it. Ya I think I am going to pass on that idea. Thanks guys!

 

Just make sure its near the bottom of the oil pan.

 

Unless you're trying to get 600whp from a 2.5" exhaust w/cat & muffler, just recirculate it. You'll see just as much as a decrease from that vs not dumping it correctly, except you'll have much less noise, smell, and soot problems. A 1.5" flex pipe costs $20 shipped from many places, so there's really no reason not to do it. Technically, an open dump is illegal in any state that requires a cat, not to mention most states require all exhaust pipes extend beyond the rear axle.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by HiProfile &raquo;</TD></TR><TR><TD CLASS="quote">Unless you're trying to get 600whp from a 2.5" exhaust w/cat & muffler, just recirculate it. You'll see just as much as a decrease from that vs not dumping it correctly, except you'll have much less noise, smell, and soot problems. A 1.5" flex pipe costs $20 shipped from many places, so there's really no reason not to do it. Technically, an open dump is illegal in any state that requires a cat, not to mention most states require all exhaust pipes extend beyond the rear axle.</TD></TR></TABLE>

That's very true. I used to run my dumptubes past the pan by the transmission, and it affected the transient respool of the impeller speeds greatly. Over the years, I got tired of it getting into my cabin, so I recirculated it back into the system. I did, however, had to slightly adjust my boost controller settings but, I can't directly prove that it was a correlation b/w the dumptube exit and it recirculating.

 

These are all good things to know. Thanks for your advice guys. Now its time to do it!