A turbo thought for big power IDI/TDI's

[KTZed]

Just scanning through the talk of ppl trying to make compound turbos work and Dave at passenger using a T3/T4 hybrid to get 200hp and was wondering if anyone had thought of, or implemented a BIG VNT turbo...not VNT20 big...GT37 VNT big. Stock turbo from a ford powerstroke. Seems a little overkill but the compressor should be similar in size to a T4 and the VNT exh. housing should be able to compensate somewhat for the huge size...thoughts?

[jtanguay]

i think with the vanes it might spool before 3000 rpm... maybe Giles could help with getting the fuel required  :twisted:

[rallydiesel]

I doubt a 1.6 or 1.9 would produce enough exhaust flow to make full use of the VNT at anything more than at the full closed position. Also, there probably isn't enough room to mount it. But you never know unless you try.

[Turbinepowered]

Inject propane into the Exhaust to get that puppy to spool? :twisted:

[jtanguay]

I doubt a 1.6 or 1.9 would produce enough exhaust flow to make full use of the VNT at anything more than at the full closed position. Also, there probably isn't enough room to mount it. But you never know unless you try.

you'd be surprised.  vnt turbo's are nothing like normal wastegated turbo's  :wink: and if the turbo is ball bearing, then it would have no problem spooling up

[jimfoo]

We know it would make the volume, but would it be able to make the pressure?

[jtanguay]

We know it would make the volume, but would it be able to make the pressure?

it should make the pressure quite easily.  enough to blow our dinky little head gaskets  :lol:

[jimfoo]

Well, it's designed to have a hell of a lot more exhaust volume going through it than what our engines put out, though maybe the vanes would never need to open much. :lol:

[jtanguay]

Well, it's designed to have a hell of a lot more exhaust volume going through it than what our engines put out, though maybe the vanes would never need to open much. :lol:

true about the exhaust volume, but the design of the VNT allows it to be quite versatile in terms of engine applications.  a 1.6 would definitely need to up its fuel to spool that big turbo though  :lol:

the reason that vnt's are so efficient is because the exhaust gas flows around the turbine, giving it almost even flow all around from the vanes/nozzles.  conventional wastegated turbo's get the exhaust volume on one angle, reducing the efficiency and also creating additional stress on bearings etc, therefore increasing friction and spool time.

i would really like to see someone put a big vnt turbo on a 1.6 or 1.9 and see the results.  i have a VNT-25, but it isn't really that big. slightly bigger than the T3.

[zukgod1]

Well, it's designed to have a hell of a lot more exhaust volume going through it than what our engines put out, though maybe the vanes would never need to open much. :lol:

true about the exhaust volume, but the design of the VNT allows it to be quite versatile in terms of engine applications.  a 1.6 would definitely need to up its fuel to spool that big turbo though  :lol:

the reason that vnt's are so efficient is because the exhaust gas flows around the turbine, giving it almost even flow all around from the vanes/nozzles.  conventional wastegated turbo's get the exhaust volume on one angle, reducing the efficiency and also creating additional stress on bearings etc, therefore increasing friction and spool time.

i would really like to see someone put a big vnt turbo on a 1.6 or 1.9 and see the results.  i have a VNT-25, but it isn't really that big. slightly bigger than the T3.

A VNT25 would be the SHIZ for my car..
What did they come one?

[KTZed]

Late model garrett application list

Edit: No VNT 25 in there but looks like all the 3.0 BMW Diesels came with a VNT 22

[lord_verminaard]

VNT 25's were on a lot of Dodge cars back in the day, mostly Daytona Turbo Shelby Z's and stuff.  A lot of people dumped them for something else, they were problematic but on a Diesel they should work better.

Brendan