Variable geometry turbos?

[iOnic]

I'm considering running a Garrett variable vane turbo (no wastegate) on a 4EFTE Starlet. Just wondering if there's anything I should consider that I havn't already (especially re: oil supply and drain) if anyone knows much about them. I like the idea and think it would work really well in this application. Just have to make sure I'm not missing anything....

Also not quite sure how I would increase the boost level on this set up.....any ideas? The vanes are controlled via a vacuum operated actuator similar to a normal wastegate actuator but there is no actual wastegate.

[JustinSpiderholden]

Intresting the hollsett one's use an electronic control unit, intresting that Garret once use vacum to control the variable vanes

Some intresting info in here:

http://www.diyefi.org/forum/viewtopic.p ... d872a958e2

[iOnic]

cheers for the link Justin Looks like some good reading in there! I'm gonna grab dinner and read all I can lol

[Akane]

search for VATN turbos, Pouya had 2 of them on his MR2 long time ago (mr2oc), it varies the geometry to get desired boost levels IIRC, and self contained oil supply, I can't remember much details you have to search for it in mr2oc.

[iOnic]

Yeah I had a look at Pouya's VATN turbo's. The oil supply on the Garrett is conventional (oil feed line and oil return line) so that's easy. I assume I'll just need to use a restrictor as with any other GT rollerbearing series turbos and a good sized drain.

[Guss]

Last i saw the VATN turbos did not last long in the higher exhaust temp of petrol engines.
This said there is now a few OEM's using them - porsche i know use a super alloy for the blades to get longevity

[Stu-]

They come out on Audi's too - I had one for a 5e build but ended up going in another direction. Can't see why it wouldn't work.

[iOnic]

Thanks Stu Might PM you at some point. The turbo we have is a brand new Audi/Garrett unit.

[AE82 FXGT]

They also come out on Mazda BT50's too. They use vacuum and conventional oiling system.

[Phothog]

You name it.... every late model Diesel has a VNT, VGT turbo of some sort.

i have just (as in it should finish the paper work... and not be typing on here. ) a 1KD-FTV Toyota VNT Turbocharger.

Every major Manufacture now makes them, Garrett, Borgwarner (3k & Schwitzer) MHI & IHI.
About ~1/3 of the Turbos we carry are now VNT of sort.

they can be controlled by Vaccum, REA (Rotary Electronic Acutator) or Hydroilc (but you only find those in the AVNT GT37 series fitted to the Navistar engine in the Ford F-Series trucks.

the only petrol appication that i currently know of is the late model Porsche, unfortunaly the manfactures havent made units for everyday passenger car applications yet.. the problem is the heat & the clerance in the vain assembly.

Iconic, just because it is a GT series doesnt mean its ball bearing nor does it mean it needs a restrictor.

Chris.