more Draw through adavice needed.
Turbo Mini Forums

When running a draw through turbo setup, is it a necessity's to run carbon seals in the turbo, to insure u don't mix the gas with the oil? Dont suppose there are others with draw through turbo's that can give me some advice.

In short, yes - it is required. Turbo life will otherwise be very short (like days / weeks, not months)...

you can run a second butterfly btween the turbo and engine ,this protects the turbo from vacuum , it opens and closes with the carb butterfly , it worked on the mini suck through i worked on .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

ahh, so you'd ideally have the one between the engine and turbo slightly smaller than the one between the turbo and air filter, or is it not too critical. That's pretty cool - I never thought about that. :)

it had to close slightly earlier dave , it got over the problem of no carbon seal . i think pete got a seal in the end , but i do remembwr him tlling me that he ran with no seal and no butterfly and it was ok , i didnt see this though so cant substantiate it , it was going through a rapid delelopment program ,and i had a fair few turbo design jobs on at the time ,so im a bit hazy , it was 1985 after all lol.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

ok so what T3 turbo has a carbon seal standard. I know 280, 300z did or many turbos pre 89 i think... can any1 roll off anymore.

Has any1 tryed fitting a carbon seal in a dynamic seal turbo.

I'm in the same situation myself. I've got a suck through setup, but have no idea of there's a carbon seal.

I looked into this a while ago (for different reasons) and apparantly you just have to fit the alternative seal plate (the aluminium backplate of the compressor that houses the seal) and a different thrust collar (shorter and without the groove for the piston ring seal), and obviously the carbon seal package to match. Apparantly everything else is the same HOWEVER, I'm going by what the supplier told me, I haven't tried it.

See pages 3-6 of the attached.
http://www.melett.com/turbo-parts-catalogu.../Garrett-T3.pdf
Although this company don't list the plates, the drawings and parts lists imply it is only the plate and thrust collar that is different, and one of the UK eBay suppliers of Garrett spares had the alternative seal plate, collar and carbon seal package available when I asked them about 6 months ago (I'll try and find the email as I can't remember which one it was) and said that was all I needed.
From memory, there are also two different types of carbon seal available, a single piece one and a four part one.

Schrödinger's cat - so which one am I ???

Vergard how is the draw through setup coming on?
Im building one at work during lunchtimes, maybe we could swap ideas/notes/photos?


Edit.this is Hariobt the way..

Edited by nutter driver on 8th Jan, 2009.

And on the 7th day........... God created turbochargers!