Externaly gated Evo 16g?

[RipperXX]

To externaly gate an internal turbo all you would have to do is buy the right header and weld the flapper shut on the turbo correct?


(just wondering)

 

[hoffman]

or remove the WG and run it off the 02 housing.

 

[RipperXX]

That would be with an O2/elminator setup right?

 

[Kinetic Boost]

Would this even be a good idea for a Evo 16g though? I mean I thought external wastegates were pretty much only needed for huge turbos?

 

[Boost Junkie]

External gates are used to aviod boost creep. The EVO 16G doesn't creep.

 

[Mike 99GSX]

There's no dowside to switching it to external. It shouldn't need it though but it won't effect the performance in any negative way.

 

[coltboostin]

any turbo can boost creep. Big exaust+stock sized wastegate+trying to run 12psi=boost creep. It is not dependent on the turbo, but the size/responsiveness of a wastegate and the amout of boost you are trying to run. If you want an in-depth explanation, I'll give it to ya

 

[RuBiCaNT5X]

Originally posted by Boost Junkie
External gates are used to aviod boost creep. The EVO 16G doesn't creep.

Even at low boost, say 12 - 14 psi?

 

[GSntncT]

Originally posted by RuBiCaNT5X
Even at low boost, say 12 - 14 psi?

I've seen a car boost creep being set to that range of PSI.

 

[TurboTerror]

Originally posted by RipperXX
To externaly gate an internal turbo all you would have to do is buy the right header and weld the flapper shut on the turbo correct?


(just wondering)

You can do it this way. It would be much easier removing the flapper, port the shit out of the WG hole, and run it off of the O2 housing.

 

[coltboostin]

Low boost is when turbos want to creep. It is at high boost levels where they dont creep, because it takes all the exaust to drive the turbine wheel at high shaft speeds, and only a little bypass to hold the desired boost at high boost.

 

[jake98gst]

Originally posted by Boost Junkie
External gates are used to aviod boost creep. The EVO 16G doesn't creep.

http://www.dsmtuners.com/forums/showthread.php?s=&threadid=87247&highlight=mad+boost+creep

One guy creeps to 25 psi.

 

[RipperXX]

Originally posted by Boost Junkie
External gates are used to aviod boost creep. The EVO 16G doesn't creep.

Funny I posted this because from what I have seen the EVO 16G is natrious for bad creep on true 3" turbo back setups.

So the best bet would be to just use an 3" turboback that use's an O2 eleminator and just pick externaly gated when I buy it?


BTW: How do you go about figureing out what size waste gate is best for your application?

 

[Boost Junkie]

The EVO 16G is not the same as a big 16G.

I have no experience with either, but I trust Robert at FP enough to believe what he says about it.

http://www.teamnabr.com/ubbpub/ultimatebb.php?ubb=get_topic;f=10;t=000219#000001

 

[jake98gst]

In that thread, he's commenting on the design and how it should improve compared to the regular b16g and 16g turbine housings. Notice the first post is 7/30/03 . That's right about the time that DSM Shops started marketing the Evo III 16g. ShapeGSX slaps that thing on and goes a best 12.2 with a best mph at 118. Ya it hauls ass. But...

I put the Evo III big 16G on my car last night. I was hoping that the relocated wastegate would mean that I wouldn't get creep. I was wrong. I get creep to about 19psi.

The turbo would hold 24psi of boost all the way to 7300RPM, but the spike I got from it was way too much (29.2psi), so I had to turn it back down.

I would trust Bob from FP also at the time since he was only commenting on design. But now that people have these things. Creep is an issue.

 

[RipperXX]

Yea, so like I said is an externaly gated O2/eleminator the best way to go? Just port the shit outa the WG passage and put what like a 38mm Tail WG on?

 

[jake98gst]

Well ya an external wastegate is the ultimate in curing boost creep and in controlling boost in general if your willing to spend an extra $500 or more.

Jake

 

[coltboostin]

I bet it creeps due to the extremly efficient turbine outlet. THe exaust wheel spins like a .... um I dont have an analogy for it.... but that housing flows well!

 

[ShapeGSX]

Yes, the Evo 16G creeps if you exhaust flows really well. But supposedly you can get rid of the creep by just porting the turbine housing inlet to direct exhaust at the wastegate.

Personally, on a turbo that holds boost so damn well (26psi), and flows really well at that boost level, I wouldn't install a larger wastegate flapper. You are jsut asking for boost drop when you do that.

 

[2gtalonklos]

Dont u think if you just get a evo ported o2 housing that will help elimante the creep?

 

[ShapeGSX]

Originally posted by 2gtalonklos
Dont u think if you just get a evo ported o2 housing that will help elimante the creep?

I'm getting a tubular O2 housing from 122performance.com soon, which may help. We shall see.

 

[Kinetic Boost]

Does anybody out there even have an externally gated Evo III 16g? I would thik just getting an external dump would suffice but then i see the topic of a external gater on the EVO III 16 and it just got me thinking.

 

[jake98gst]

I seriously doubt anyone does for a few reasons:

1) It's a relatively new turbo, and the only way it is offered is internally gated.

2) Budget...The people that buy this turbo are most likely out to get the most bang for the buck. It's putting down the same times as turbos twice its price. These budget-minded people do not want to spend an extra $500 for an external setup when an internal gate will suffice.

3) It's wicked fast turbo but still very street friendly. You'd be hard pressed to find aweekend warrior's turbo internally gated and pressed even harder to find the weekend warrior's girlfriend with an externally gated turbo.

Jake