Variable Vane Turbo

[Scarecrow]

vvt's also dont run a waste gate they just trim the vane to lower the speed, hence less boost. We run them on the scanias at work. Its all ecu controlled. and I think they are around 20 g a piece!

Edited 14/06/10 09:45 AM by Scarecrow

[sexual harrassment panda]

I know a lot of diesels don't run a wastegate, all of our locomotives at work dont, but closing the vanes will increase backpressure and heat in a petrol. An external wastegate setup (a la 6boost manifold) would be helpful on a petrol I think.

[GR8XR6]

In theory could this work??

[sexual harrassment panda]

In theory communsism works

This is doable but at the moment it would be to muchy $$$.

a remote mounted setup might be cheaper but would probably defeat the purpose.

[orangeute338]

TURBOCHARGER DODGE CUMMINS 6.7 HOLSET HE351VGT : eBay Motors (item 170500937540 end time Jun-22-10 20:08:47 PDT)

since when is $200 expensive? turbo off a 6.7 cummings should be big enough or a xr6t ay?

[sexual harrassment panda]

sounds like the yanks have started playing with these Monster Turbo Mx6 - Mazda MX6 Forums: MX6 Forum

link to one fitted to an old mx6 Monster Turbo Mx6 - Mazda MX6 Forums: MX6 Forum

"Then there's the issue of what logic to use in governing the gate actuation. I think on the OEM fitment, the ECU is basing it on shaft speed, and that's one of the outputs (hall sensor?). Not sure if it's worth the effort of reading that though. I guess basing it on the boost pressure is probably about as good.

I saw where someone had just removed the electronic controller and replaced it with a normal WG actuator, on a little fabbed bracket. I guess that would work if you set its operating pressure somewhere below the WG operating pressure. For example, have the vanes set to open fully by 10 psi, then have the WG open at 15 psi"

"The electric actuator has been removed. I haven't been able to determine what kind of signal the stock ECM sends the unit to move it, and what it sends back for position information. I removed the electric motor, and epoxied the coolant holes in the flange that are meant to cool the actuator. That leaves an arm with a gear on it, there is a hole in the arm that is pretty close to the distance from the pivot as a standard internal wastegate arm. I put a pin in there, and attatched a 14b wastegate actuator to that pin. Then you have to find somewhere to mount the head of the actuator that's solid. That will vary by your application, and what actuator you use."

[orangeute338]

you could just have the same as the wg, you wouldnt want them opening to soon or else you might get boost drop....just think if you have it set at 15psi and max boost is 15psi it will spool up super quick maybe 2-3k then the vanes will open, if you had it set at 10psi and wg at 15psi it might spool upto 10psi then open the vanes then its like having a huge turbo at 2500-3000rpm, some of the big ones down even start to spool till 3500-4000....all depends on sizes and what boost and whateva

I dont know if its been said before but has anyone seen the flaps that cover one side of the twin scroll turbo inlets, to premote faster spool. had I idea today of having twin gt30s or even 2 factory turbos. have 3cyls feeding each turbo with a link pipe connecting both, then on one of the flanges to the turbo have a flap so all the exhaust flow goes to first turbo....then at a set psi open flap so then its a true twin setup....would have stock like spool up then once first turbo runs out of puff second turbo spools up and keeps on pushing over the 400kwish limit of the stocker...

like that cept whole thing is blocked think of a t3 one being one of the ports

[sexual harrassment panda]

sounds interesting - epically complicated but very interesting.

[orangeute338]

not really, just have 2 turbos cept one has a flap so doesnt get any exhaust then when you hit full boost the second turbo gets exhaust and spools up...only extra part you would need other then a normal twin setup is a flaper for the second turbo....whats complicated about that? on the intake side you could compound the boost or have a check valve for the turbo that's not spooling till later...like the boost logic setup cept not 3 external wastegates and the dump pipes are seperate...

[Ricky N]

I bought two Porsche VTG Turbos to satisfy my own curiosity. There is nothing super different inside compared to other Variable Vane turbos other than the material the parts are made from, the electronics that control them and the use of an Extendard Tip compressor wheel.

I have also looked at and pulled apart Holset’s and Garrett’s versions.

I have had a close look at an AreoCharger AEROCHARGER Turbocharger is the most advanced form of forced induction, giving you the edge over the competition. First to Boost, First to Win. . They are a bit different than your average turbo but are also very fragile. A bit too fragile.

I modified a Garrett variable vain turbo to work with a normal wastegate actuator and fitted it to our daily driver 4x4 diesel. It took a bit of playing around but it works really well now with close to off idle boost and good power. The fuel economy is awesome. Picked up well over 100km per tank over the old turbo setup.

If anyone is interested to see it I’ll take a photo.