Topic pretty much says it all. I'm thinkig about running a pipe straight down from the wastegate into the top of the downpipe. Would that cause any problems/ unwanted side affects that i should know about?

 

need to keep good exhaust flow. A good rule of thumb has been to run a second Downpipe for 18 inches and then merge back to the normal exhaust right b4 the cat.

 

sounds like a good idea to me..i wonder who could make that pipe for me?

 

if u have the o2 houseing and WG housing any exhaust shop should be able to do that in >1hr.

 

You'll loose horesepower if you pipe the dump tube into the exhaust. I'd keep it vented to the atmosphere and run it out to the fender.

 

not very environmentally freindly

 

Posted by: Whitey Posted on: September 30, 2003, 0748 pm
You'll loose horesepower if you pipe the dump tube into the exhaust. I'd keep it vented to the atmosphere and run it out to the fender.


is this for certain? or just in your opinion, cuz i dont see why it should loose hp, its not restricting any air flow.

 

as long as u have a 2.5" or larger cat back exhaust and the downpipe tube flows smoothly into the main exhaust it will be fine.

 

Its not my opinion it is certain by experience. unless you have 3 inch or bigger exhaust it won't be that dramatic. And if you have a cat too than its a definite power loss. Even the one company (I think f-Max) had their kit dynoed with an atmospheric and without and it was like a 30hp difference.

 

So you mean that an external wastegate set up with atmospheric dump will make more power than an internal wastegated turbo?
That sounds theoretically correct since you would have less exhaust gas volume allowing the gasses passing through the exhaust to exit quicker thus spooling quicker(---- does that make sense?).