External wastegate Placement

[jazzyjay]

I have notice external wastegates being placed in a number of different places. The two main areas are, the exhaust manifold and on the O2 Housing. Is there a difference in spool-up time, hosepower, ect.....?

 

[GSX4LIFE]

Not really, both work well. I would prefer off the O2, but thats just my opppinion.

 

[Awdboost]

The O2 housing is best way to do it. Some people who place it on the number one runner will have boost creep with a big turbo and I have heard that the running the waste gate off the O2 housing sound much better.

 

[larryd]

This is ofcourse unless the wastegate is off the #1 runner and not the collector. If it is off the collector it is essentially the same as off the o2 housing.

 

[DSMJim]

Show me an example of where off a single runner that the the car had boost creep problems.

A car we built made 450 to the wheels, has the gate off a runner and doesn't have boost creep problems when 100whp shot of nitrous is brought on.

I just can't see a street car having problems with the wastegate setup like this.

 

[JayHass]

Originally posted by DSMJim
Show me an example of where off a single runner that the the car had boost creep problems.

A car we built made 450 to the wheels, has the gate off a runner and doesn't have boost creep problems when 100whp shot of nitrous is brought on.

I just can't see a street car having problems with the wastegate setup like this.

God, I'm so sick of seeing this subject and people attempt to defend runner mounted WG's just because "the car ran 10's" or whatever. It's the wrong way to do it. Period.

Just because something gets the job done doesn't mean it's the right way...duct tape gets the "job done" in many cases as well.

You are causing a very large pressure drop in #1 compared to the other three cylinders. What does that mean? The VE for #1 is WAY higher than the other 3. What does that mean? It means it needs a LOT more fuel. Do you have a way to measure and tune each individual cylinder?

You are also causing exhaust gas to "backflow" up the #1 runner from the turbine housing. NOT good.

 

[iwantawd]

you are so smart S-M-R-T!
jayhass what do you think about placing it on the turbine housing, i've never really got a good response from anyone about this.

 

[JayHass]

I think it's the best place from it aside from the collector (Which we can't use easily.) I assume you are talking about going off the original internal wastegate port.

 

[iwantawd]

not sure dont think so though im picturing a symetrical Y coming off the housing where it starts to bend around. im stupid and can't explain things very well but the housing inlet goes straight for a lil bit then lets say it starts to curl to the right then you have something probably welded on that curls to the left at that same point so flow is split evenly and i would think it would have the BEST BOOST CONTROL POSSIBLE wooohoooo
btw if you didnt notice i dont have a turbo to look at cause i lost my license so thats why i dont know where that internal wastegate port is

 

[P8ntBalla]

I have mine mounted on the #1 runner. I would have gotten it on the 02 housing, but i got a 3" dp with the 3 bolt collector style bolt pattern and noone makes one for that. Anyway I have absolutely no problem with creep. If you mount this on the collector, wont you have to cut out those, ummmm.....shit what are they called......the little things that direct air towards the turbo? I think that would lead to lower air velocity going into the turbo because when the gate is closed all that air is going into that chamber and slamming into all the air from each other runner, and then going into the turbo instead of being guided smoothly into it. Either way, by the time I have a big enough turbo in this car to actually have problems with this setup, ill have a tubular manifold and an 02 mounted tial 40mm.

 

[P8ntBalla]

kind of a crapy pic, but you get the idea. and no, my rad. hose doesnt melt. im going to route that down the right way when i get tmore time.

 

[Tevenor]

Originally posted by P8ntBalla
kind of a crapy pic, but you get the idea. and no, my rad. hose doesnt melt. im going to route that down the right way when i get tmore time.

Dude, seriously. You have an external wastegate but you still have the stock plastic POS intake pipe?

If you are that broke, we can take up a collection or something.

On Topic: I agree with Jay. If you are using non-cylinder specific tuning methods (like most of us do), you want to vent at the collector which is damn difficult with our cars due to the space and stock manifold design.

 

[P8ntBalla]

, im actually going today to get some pipe, im gonna cut the accordian section out and replace it with the pipe i buy, good as dejon

but if you guys want to send me money.........

 

[larryd]

Originally posted by P8ntBalla
, im actually going today to get some pipe, im gonna cut the accordian section out and replace it with the pipe i buy, good as dejon

but if you guys want to send me money.........

And whats your excuse for the stock UICP? $$ didnt stop you from buying that big flashy BOV did rice boy

 

[candela]

And whats your excuse for the stock UICP? $$ didnt stop you from buying that big flashy BOV did rice boy

:laugh:

 

[P8ntBalla]

. well the home depot performance uicp is in now, gotta get some pics of that up

 

[JayHass]

Originally posted by larryd


And whats your excuse for the stock UICP? $$ didnt stop you from buying that big flashy BOV did rice boy

"Balla" dude, you're getting owned.

 

[Omega]

The optinum method is to have ALL cylinders lead to the wastegate and have it as a 45 deg angle from the flow of the exhaust gas. It's that simple. Anything else isn't as efficient.

Read Corky Bell's book.

 

[Awdboost]

The one thing I don't understand is why is there a Cast Tubular Exhaust Manifold For Garrett Turbos that has a tap on runner one for a 35mm tial? Why would they do that

JayHass, I agree with you 100% Do it right the first time.
Omega, Good luck setting up that in our engine bay.

 

[P8ntBalla]

Originally posted by JayHass


"Balla" dude, you're getting owned.

well see who gets owned when you guys see my home depot performance ucip

 

[abrxy3]

cant u hear external wastegates dumping when its installed on the manifold

 

[P8ntBalla]

yup