I have asked those that think EWG is better than IWG how that is. Putting some critical thought to it, I still don't see a significant advantage. If you're already IWG'd, don't bother with EWG. That's my opinion anyhow.

As for how far the flapper opens, it doesn't need to open 90* to achieve full flow. It needs to open probably at least 25*, but no more than 45*. I'd have to check my port opening spreadsheets for a more accurate response. Its been years since I've looked at it...

Divorced downpipes are a joke in my opinion too. I'm full of opinions this morning So take it for what its worth:biggrin:...

 

even the ones like element tuning or vashnus that re enter 2+ feet down the pipe.

 

Yep. I've put critical thought to this one, not testing. But based on my analysis, I don't see how EWG helps you make more power, assuming an apples to apples comparison.

I could see how EWG could help with boost control and mitigating boost spike, but when folks claim it helps with power production, I call BS. I've yet to see an apples to apples comparison, where someone dyno tests a IWG, quickly swaps on a EWG, with no change in ambient conditions, and retests.

I hear people say "it was worth 10-15hp on my 500hp engine", and then you ask what else was different..."oh, it was 20* cooler that day" :shrug:

 

i think your misunderstanding me.
im not thinking about this because i want more power.
im thinking about all these things because im putting a big 16g on a 2.5l motor
and im trying to get away from the creep that im sure is gonna happen
i can build my own ewg setup for under 200 bucks.
thats why i think the divorced wastegate downpipes will help a little bit with the creep problem

 

The TD05 turbos wastegate flapper does open up further than the VFxx turbos, and a lot of people have issues with the perrin DWG downpipe on them.

As far as the EWG vs. IWG question, EWG will does more power and have better boost control. It makes more power on bigger turbos where the turboback is not big enough to evacuate the gases fast enough to make the best use of the big compressor wheel. I'm not sure it's necessary for the power level you are looking at, and for a DD, the cons outweigh the pros IMO. That's a whole other discussion though.

 

, and a lot of people have issues with the perrin DWG downpipe on them.

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thats where my concern was. i think that i can remove enough material on the edge of the pipe flange without damaging it and giving it enough clearance for the flapper.
because it does hit almost instantly on the flange so that makes the gas slam into the divider then move around it which im sure causes even more back pressure

 

EWG should make the turbo run cooler since the compressor wheel actually slows down rather than having the compressor wheel spin faster but just bleeding the air off. In theory, the charge air should be cooler with EWG. How much cooler I dono.

Anyone know where I can get a 12lb WG actuator? I have a 7lb actuator and its having trouble holding boost up top.

 

Cooler? I don't think so. The wastegate has zero impact on the intake temperature. At that, you want the turbine housing to be as hot as reasonable to assist with spool up.

As for the WGA, what turbo are you running? If you are running a TD04, find yourself a 2.0L TD04 WGA. I believe its a 10lb WGA. Thats what I have on my FXT and I don't have any issues hitting boost targets...I've got a thread on it somewhere around here...

 

I've seen pretty good gains using an EWG. IWG's introduce turbulence both at the turbine inlet (separation of flow along the turbine wall when the wastegate opens) and at the outlet.

The former results in flow disruption to the blades of the turbine, which has the effect of reducing turbine speed below what boost levels require. The latter inhibits flow through the turbine all together (the same reason a divorced wastegate provides better performance than a bellmouth).

At least that's what I would imagine happens.

An EWG eliminates both of these issues, allowing exhaust gas to smoothly divert from the turbine inlet well before the turbine itself. That's why EWG's tend to help power production. You simply make the turbocharging process more efficient by reducing turbulence. You also get finer boost control as a bonus.

 

I'll call BS on all of those points until I see real test data produced in a controlled environment...(not trying to be a jerk, but I have thoughts and opinions too, and the only thing that will ever put these sorts of arguements to rest is reliable, accurate data)

 

The forge ones are neat, but kind of poorly made. We had to replace the actuators on a Twin Turbo 350Z a long time ago with a set of Forge ones. Threads pulled out of both of them.