looking for idea's/sugestions on wastegate placement on a turbo v6.......set up is 2 3-1 manifolds that go into 2 pipes which "Y' right before the turbo inlet. with the space i have to work with.......there is no way to really have the exhaust flowing directly towards the wastegate.....and since this is going to be a low boost car (6'ish psi) im kind of worried about it..... i can run 1 wastegate off of the Y collector before the turbo...but its going to have to 90 off of it. unfortunatly i have a 38mm wastegate i have to work with too.

would dual wastegates be a smart idea? im sure pictures would help a lot....unfortunatly i dont have any at the moment.

or maybe if anybody has any pictures to post up that would help me out too.

thanks in advance

 

I have a wastegate on only one of the banks on my Monte. A lot of the Grand Prix turbo kits also only have a wastegate on one bank. With a cat or restrictive exhaust, the wastegate had no problem controlling boost. At low alitiude with a good exhaust and no cat, I couldn't keep it below 11 psi though.

Tim

 

Twin 38's right before the Y into the turbo would be fine. We run twin gates on all of our divided manifolds without issue.

 

More than likely there will be plenty of exhaust backpressure to make even a single 38mm function properly. The problems stem from very smooth exhaust flow and low backpressure.

How big is the motor and what turbo?

 

3.2L T4 .68 SC61 3 inch downpipe and for now through a 2.5 inch exhaust. the Y before the turbo flange is horizontal......no room to go under the Y with the wastegate.... unless it does a few bends....and on top there isnt a ton of room unless the wastegate 90's off the top of the Y. there is a ton of room (well compared to everywhere else) if i was to 90 off of the top of the Y....but in the opposite direction of flow.....i think im going to make the downpipe and then figure it out a little bit more from there. space on the downpipe is really really tight too.

being that the manifolds are both fairly long.....is that going to have any effect on the importance of wastegate location? i would assume it would give it a little more flexability.....but i'd rather not assume

 

With that turbo on that displacement motor and a 2.5" exhaust, you will have plenty of excess backpressure. WG operation should not be a problem, even at 180deg opposite exhaust flow. If you think about it, the cars that have boost creep problems are high reving small displacement motors with big turbos and very smooth flowing manifolds. You have a similar size turbo to a high hp honda, and twice the displacment...and half the exhaust size! lol It'll be fine man, put it where it fits best.

 

thanks tony! you da man!

 

Not too sure if this pic helps, but I have the two banks merged before it reached to the turbo to free up some room. The exhaust flows straight to the wastegate and I was able to run uber low boost (6 psi) when I first got the car running.