I'm getting ready to fab up a downpipe with divorced wastegate flow. What do you guys think about dumping the wastegate flow to the atmosphere? Any major issues that you guys can forsee?

I'm going to try and seperate the main flow from the wastegate the best I can with a baffle like begi, but it probably won't seal completely. Any issues that can arise from that small leak?

Thanks for the input.

 

exhaust leak before the o2 sensor? it will probably sound like a bag of *** too for what that's worth.

 

all relative.

bag of ***, as in loud and ******* killer?

 

why not just do it right??

 

Merging the wastegate back into the main flow is an option too. Just want to see all the side effects of dumping it to atm.

My thinking was that dumping it would yield some quicker spoolup and maybe a bit more power since it doesn't introduce high pressure exhaust back into the lower pressure main flow. (maybe my thinking was overly exagerated?)

 

I drove someones Miata that has a VTA wastegate and it works fine, though it is external. When the wastegate opens up the car produces a BRAAAAAAP that is not unbearably loud but is still quite noticeable. It resembles the sound of a Jake Brake on a semi IMO.

I am speculating here, but when the wastegate is closed, you could have a possible venturi situation where the flow across your baffle separator (turbine exhaust) will draw air in through the VTA tube for the WG. That would be a problem if you are making O2 measurements.

The vent tube could end up sounding like an exhaust leak too, all the time, which would annoy me to death.

 

I love the sound. On my FD it was badass imo

You cant really hear it all that well here but oh well
http://videos.streetfire.net/video/M...t-to_33214.htm

 

You'll only hear it at WOT under full boost.

I had all my Talons dumping and it's a very manly sound.

It's also sometimes helpful to be able to hear your wastegate opening to solve issues.

The O2 sensor is measuring a ratio so it doesn't matter if it sees full exhaust volume, I think this is what Brain was saying.

 

something to that matter...shouldn't pose a problem if the dump tube is long enough....plus a divider so be in place, shouldn't be anyway atmospheric gasses could mix back down into the DP and throw the reading off.

 

I can't see any good pics of BEGi's baffle on their site, but if you build one like Greg Dupree at Specialty Z does for the 300ZX, I don't think you'll have any leaking issues: http://specialtyz.com/downpipes.htm





I personally wouldn't want to run an open WG dump due to the unnecessary attraction from ricers and law enforcement, YMMV.

 

Hmmm.... Rods thru the oil pan?
Stephanie

 

There are no side effects other than a badass sound. If I had a external wastegate I would defentally dump it to atmosphere.

Plus you can only hear it under WOT

 

Why would dumping the wastegate cause that?

 

Say what?

 

 

Sorry Steph, I don't get it...

 

Neither do I? My old car ran VTA on my Wastegate for many years and at 498hp.

 

Now that I think about it, I rather not attract more attn than I already do. Heading to the merged route.

On the another note. I was having a hell of a time trying to get the turbine housing clocked. It's pretty arkward to hold and bash at the same time, but I found a method without the need of any bashing or heat, although heat may help, and lots of PB Blaster.

Bolt Jack method. I backed out the turbine housing bolt against a steel plate and a wood block. This popped the turbine housing off with the quickness. The heads of the bolt got a little scruffed, but when that housing popped off, felt like I got high.

 

I think she was referring to more powah!!! Unless it was something haverty said....

 

Snap... if you use something like that, forget what I said about leaks. That is a nice way to do it.