why is that people say you loose horse power from dumping back excess boost back into the down pipe if it is not located 10 inches after the turbo???

 

:i would like to know also


[Modified by accorracer, 3:24 PM 12/30/2002]

 

the rule of thumb is that you won't loose power if it's at least 18 inches after the turbo. You'll also want to try to make it a smooth intersection, like a 45 degree angle as opposed to a 90

 

I think it has something to do with the exhaust being very turbulant leaving the turbo.. you need to give it time and room to smooth out the flow. Also most down pipes have hard bends and lots of angles right away.. This hurts flow, so buy taking a chunk of exhaust gas out of the beginning of the dp its like having a bigger dp. Then you add it back in once things have calmed down some. I hope that helps.

 

so i will loose power?? or will the dumping of excess boost just be more turbulant because of exhaust flow? will there be so much turbulance that the wastegate might not even open??

 

i think the answer might be if you reenter the gas back into the exhaust flow early it can create exhaust backup and you will not get as much horsepower. so if you reenter later it will less chance of exhaust backup and the exhaust will enter more smoothly and cause less turbulance.

If that did not make any sense, sorry, get over it

 

any other peopel routing their dump tube back to their dp??

 

what about internal wastegates? aslo why would you even bother having a dumptube?

 

i have no dumptube, it just shots out the wastegate. kinda loud at times but daily driveable. with no dumptube make sure your not runnin to rich, you wouldn't want to shot flames at your ac lines, but i dont't have those anyways so i dont worry.

 

can anybody explain why having dump tube to close to the turbo causes loss of power??

 

He hit it right on the head. Backpressure = BAD

 

Run it open!
No need to run into the exhaust system except to quite it down.

 

well if you are environmentally friendly you would run the WG dump back into the exhaust. Because the WG gasses haven't had a chance to go through the catalyst yet.

 

Who runs a cat with a turbo application.
Mine is no cat, no resinator, 3' exhaust with a small muffler.

 

lots of people do, they just go with a 2.5" or 3" cat.

EDIT: at least those that are law abiding do, did you know it's a federal offense to remove the cat? some states are really strict when it comes to enforcing it and others aren't.


[Modified by BlueShadow, 1:56 PM 1/1/2003]


[Modified by BlueShadow, 1:56 PM 1/1/2003]

 

Whats a catalyst...

OHHH YAH...thats the thing they have on those all motor cars.

Come on now no turbo cars run cats...unless they dont have anything in them, or they want to lose a lot of HP

 

a to loud exaust or dump tube will not give you a chance to ear detonation if it occur!

 

That's why you have all those fancy gadgets and doo-dads to monitor your engine and adjust timing so that you dont detonate.

 

Someone needs to add a spelling and grammar checker into these forums

 

catalyst full exhaust 2.5 inch dump

3inch downpipe out the side of the front bumper


[Modified by MotorMatrix.com, 11:36 PM 1/1/2003]

 

3" turbo back is good for the street or strip

I'm sorry if the cops read this forum then yes I have a cat

 

You don't need a cat if you run with a higher ring package and never see high intake temps. Otherwise I don't use a cat either.

 

thats my point i live in cali were it is very strict on smog and plus i hate that lawnmower sound when hitting boost, so what happens if i run it lets say 5in pass the turbo??

 

whats a catalyst?? im running open, its not loud at all

 

how you gonna pass emissions with an external wastegate in cali??