wastegate outlet??

[euro_urs4]

hey guys i have a question im building the down pipe for my holset hx40, and was running into some confusion with my brother, im trying to route the wastegate into the exhaust downpipe, and my brother is saying to leave the waste gate pipe seperate running open under the car, what is the benefits of each, and will the open wastegate pipe give me more chatter? thanks

[Billman]

It is better to leave the wg separate but it will give very loud noise.

[s2_bo]

Really it depends on what the car will be used for.
But like Billman says a separate pipe is better because it doesn't inhibit flow of the exhaust as much as the wastegate gasses have there own exit pipe. However the extra noise, and there will be plenty of that at full chat may be a problem on some tracks and may also get irritating when driving.
I have heard of motorbike silencers being used on separate wastegate pipes to silence them a bit..

[Dan]

Edit: Never mind, I was being dumb

[andy10v]

As a side issue (and feel free to shoot me down if you've already considered it), with stock ECU etc. the wastegate should be recirculating (else ECU going on MAF reading can't accomodate).

Wastegate diverts exhaust gas around the turbo, diverter valve recirculates air from the pressure side to the non pressure side of the turbo.

Thread from a few months ago, some opinions and arguments;

http://www.s2forum.com/forum/showthread.php?t=47323&highlight=screamer

[Zoig]

As a side issue (and feel free to shoot me down if you've already considered it), with stock ECU etc. the wastegate should be recirculating (else ECU going on MAF reading can't accomodate).

Otherwise, as above... depends if you want that oh-so-ricer hiss

Are you sure you are not mixing wastegate with blowoff/bypass?

[s2_bo]

Dan thats not correct, as the maf measures air going in not gas going out, the only measurement then is the lambda probe. Aside from that he wouldnt be using a stock ecu anyway with a turbo this size

[euro_urs4]

Wastegate diverts exhaust gas around the turbo, diverter valve recirculates air from the pressure side to the non pressure side of the turbo.

Thread from a few months ago, some opinions and arguments;

http://www.s2forum.com/forum/showthr...light=screamer

read up on this post and looks like something i can handle im not easily annoyed by the loud sound, however best way is to give it a try, cause you can always add a restrictor onto it, and if its true that it frees up airflow, and adds hp thats just that much better

[Dan]

Are you sure you are not mixing wastegate with blowoff/bypass?

Whoops... yep. It was getting late, so schoolboy error.