VGT Turbines
Turbo Mini Forums

The other day I got offered a chance to acquire a VGT turbo unit really cheap (read free) off a 2.3l turbo diesel truck. Now AFAIK I can't use such a turbo in the normal way due to the higher EGT of a petrol (and also unleaded) engine. However I was wondering which, if any, of these options would be best:
1) Situate the turbo further down the exhaust system- though this would increase turbo response
2) Try to manufacture some kind of cooled exhaust manifold to reduce the turbine inlet temperature (refraining from referring to it as the TIT just in case certain members are reading this )- though this would reduce the overall performance of the car I'd imagine.
3) Pack in the idea all together and fork out 200 squids for a VNT25 unit
4) Pack the entire idea in and stick with the currently unknown turbo I have lying around in my room (think it's a T25, T28 or T3... havn't been able to match any details yet and it needs a rebuild)

Cheers lads :)

There is no sense crying over every mistake- you just keep on trying til you run out of cake.

the VNT turbo has an inconel turbine that is capable of 1025 centigrade exhaust temp, not too sure about VGT though.

What model is it? got any pictures?

J

Not sure yet- haven't actually got it. From what I gather sounds like a Holset HE200 turbo unit.

There is no sense crying over every mistake- you just keep on trying til you run out of cake.

i thought you could use diesel turbos on petrol engines with no problem
the other way round is sometimes not possible: if the turbo has a ceramic impeller,as the diesel would destroy it
least thats what i heard

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The Turbocharger:God's Finest Minute

I think it's slightly different with VGTs because of all the moving parts in it- the higher temp of the petrol causes problems over time. I've heard varying reports on how badly and how long it takes to effect it though.

There is no sense crying over every mistake- you just keep on trying til you run out of cake.

As its free I think you need to go with it assuming its got something like the right size compressor.

I'm going to try running a variable vane turbine on my 7 port, my idea is to have a larger turbine than it would normally be able to run with a conventonal divorced wastegate to limit the total boost and use the vanes to control the low end boost.

some of the actuators have a electrical module on top to feed vane position back to an ecu, this could easly be used to measure vane position via a dial/meter on the dash and give some idea of how well the turbine is sized.

With regards to reliability, I don't think they can be that bad, I'm going to stick mine on along with a TIT gauge (snigger) and dial to see if the vanes stop moving and see what happens. I'm guessing it may pack up after maybe a year, and i'll see what has gone wrong at the time.