Engine/Transmission (1998.5 - 2002) Lets talk VGT

[NoSeeUm]

The HE400 or the HE500 are what I'm talking primarily about.



Holset says that these turbos have been in use in Europe for some time. How come no buzz at TDR or over here stateside?

The inherent mechanical strength of the Holset design with its fixed vane nozzle permits high levels of exhaust braking to be achieved with total control and no deterioration in braking performance over the life of the engine. The Holset VGT enables you to dispense with a secondary exhaust brake, saving both weight and cost.

This sounded good and hits the best of both worlds.



Jim

 

[EMD-Run8]

I think there's extensive electronics involved in running one of 'em. Moreso than what a 2nd gen has to work with.

 

[tgee]

Much better at reducing turbo lag, also are pretty effective in exhaust brake mode. Electronically controlled for better control of boost. Believe the only things electronic that were added to control it were turbo speed sensors ( don't want to overspeed any turbo too much ), also sometimes an exhaust temp sensor.

 

[tgee]

The HE400 or the HE500 are what I'm talking primarily about.



Holset says that these turbos have been in use in Europe for some time. How come no buzz at TDR or over here stateside?







This sounded good and hits the best of both worlds.



Jim

Not sure what they mean by fixed vane technology, VGT stands for variable geometry turbo, others are VNT, variable nozzle turbo, correct?

 

[NoSeeUm]

Not sure what they mean by fixed vane technology, VGT stands for variable geometry turbo, others are VNT, variable nozzle turbo, correct?

I am not sure about all the naming nomeclature. This will evolve by each manufacturer.



For turbines in general, the vanes are stationary blades and are attached to the inside of the casing. The "blades" are attached to the shaft and rotate with it. For adjustable vanes you attached each vane to a ring that goes completely around the outside of the turbine casing. As you rotate the ring each vane rotates by the use of a rack and pinion or a pivoting arm etc... .



If you take a good look the picture on the Holset web site it kind shows something different. From what I can see there are no vanes. But instead a sliding cup that throttles by uncovering or covering more or less of the turbine wheel. This seems a pretty good melding of existing technology.



The ATS Aurora MST design is different. It uses a plate that flops back and forth. Directing exhaust gases in the process to one or two turbine wheels. A good write up is HERE. In this case MST means "Multi Stage Turbo". Yet another acronym.



At any rate, you get twin turbo versatility in a single turbo casing.



Got any more links?



Jim

 

[EMD-Run8]

Fear of the unknown maybe? I gotta admit it sounds pretty sweet..... and they sound good on the 6. 0 powerstrokes. I just don't like the way the rest of the motor sounds! :-laf