superpilun

the basic idea is that when you dump the wastegate back into the exhuast it creates turbulence at that point, which increases back pressure, which is bad for the efficiency of the turbo. just dump it to atmosphere and forget about it.

Reddy

If you think its only a theory than get your car dynoed with an open wastegate, than dyno it with the dump tube in your 2.5 exhaust. If you prove me wrong I'll buy you a HMT sticker.

leed

Staight outa Maximum boost....hehehehe

I vote for the merged WG for two reasons:

1- Good luck listening for detonation :P

2- Sounds like ***.

I'd put $50 on a 250hp turbo engine NOT gaining 30hp from changing to an external. And Im a Jew. :P
Maybe on a 450hp car.

Reddy

yeah it does sound like *** but you can hear detonation clear as day with an open wastegate if you listen to the exhaust comming out of the wastegate. The exhaust will tell you if the engine is detonating

Johnyquest

hearing detonation is no problem w/ my open dumptube, and I must say, the car get's noticeably faster when the wastegate goes wide open. Hell, it's a free path for extra exhaust to go out of. It's like a second downpipe, zero backpressure. Makes my 2.25 seems like a 3"

HMT-Admin

I have a very keen ear of hearing detonation, and with open wastegate dump its incredibly hard, especially when your boosting 12-14psi. That little ****** goes off it sounds horrible, I think it even says in maxium boost by corky bell "The sound is described as 2 wet lesbian ----- farts merged together"

I also vote for running the WG dump tube back in the downpipe, the farther down you go, the less power it will robb. And I've read fmax's dyno's and I still dont beleive its robbing 30hp, especially on setups like ours. If you have a nice free flowing exhaust and the WG dump tube is way downstream you will be just fine.

Johnyquest

yeah, jeff's probably right. It does sound like ***, that i will admit. I hope i'm not missing the detonation-- that would suck :P