Variable Geometry Turbocharger?

[WeirCummin]

Cracker, yes it sings very,well, to the point I don't use my Scotty housing any longer & have plugged the hole in the firewall. I'd say it sings just like the Garret.



Nowel, thinkin your'e right. I was wondering what that noise when we passed that group of cyclist. Didn't see a thing but Tom, ya should'a noticed me spittin spokes & sprockets out the 'ol tailpipe.



dj. I looked @ the aerocharger site. Their turbo is like the Garret w/ the adjustable vanes w/in the housing and works off a simple boost control. The Holset I'm using is in the normally open of fail safe position & takes 5bar to get it closed under drive pressure.



What does a moped & a fat chick have in common ? there both fun to ride, but ya wouldn't want your friends to see ya on either of them

 

[JD SLVR 03]

Hey guys fyi... Cummins already produces a version of the ISB for motorhomes with the variable vain turbo, EGR and HPCR.

Check it out http://www.cummins.com/na/pages/en/products/rv/isb.cfm

Now all we need to do is get ahold of that turbo. After looking at Holsets web site it looks like it is already avaliable. Just wonder what it costs.

JD

 

[HVAC]

Cost Prohibitive

Pricing has been sky high. Surely the cost will drop as time goes by. I believe the turbo is over $2000, and that's not including the control system. While I know you can obtain the turbo, I'm thinkin' you'd be very challenged to try to acquire the electronics.

 

[Steve St.Laurent]

According to a Cummins engineer that took us through their engineering facility last summer at the TDR Nationals the VGT turbo cost them $2000 MORE than the one in the Dodge application. For that reason he said it was doubtful that we would see the VGT turbo come to the Dodge - said they could do EGR without it although he wasn't sure they would have to go with EGR or not to meet the new emissions requirements.

 

[FFutch]

Originally posted by JD SLVR 03

Hey guys fyi... Cummins already produces a version of the ISB for motorhomes with the variable vain turbo, EGR and HPCR.

Check it out http://www.cummins.com/na/pages/en/products/rv/isb.cfm

Now all we need to do is get ahold of that turbo. After looking at Holsets web site it looks like it is already avaliable. Just wonder what it costs.

JD

Did any of you guys check out the torque cuves on this link,flat as a pancake on both models ... Doug

 

[WeirCummin]

The turbo on a motorhome ISBe is a variant of the HE300. Either pneumatic or electric servo. The E-brake feature is do to the small size of the turbine housing. I was hoping to be able to use this feature on my turbo. When it didn’t work, I called an engineer @ Holset that has been really helpful in getting my setup to work. His response was that there isn’t enough displacement from the 5. 9 to create the backpressure Ya'll have to remeber that I've got an HE400 series, or what would be considered it's father.



Nowel is right on about pricing. Both the VGTs I’ve bought were a little over 2K each. As for acquiring the electronics, there is no such animal. All controlling of the turbo is done via the ECM. Either being a signal sent to the servo mounted on the turbo or a pulse width modulation signal sent to a divorce mounted pneumatic control valve. The latter being the setup on the ISM and the one in which I use.



Mr. Webmaster Steve, I’d bet that engineer was pulling your leg. The word I’ve gotten out of Holset is that in OEM applications, the VGTs are in the 5 to 7 hundred dollars range over a fixed geometry turbo.

 

[scotmartin]

Try this link: http://www.tougheststandards.cummins.com/tshome/misc/vgt.jsp



Scot

 

[HVAC]

Vid

That link has a vid on it that shows exactly how the turbine housing opens and closes to modulate drive pressure. You can see the vanes don't change pitch, the housing moves to simulate a multitude of different turbine sizes. Pretty cool

 

[scotmartin]

Looks like it simulates a variety of exhaust housing sizes.



Scot

 

[HVAC]

Echo?

Scot, did you read my post?

the housing moves to simulate a multitude of different turbine sizes

Not sure how your post added to that?

 

[scotmartin]

Because there is a diffence between the turbine size, and the turbine housing size.



Scot

 

[WeirCummin]

http://www.tougheststandards.cummins.com/tshome/misc/vgt.jsp



yep, that's my turbo

Because there is a diffence between the turbine size, and the turbine housing size.

Scot,

The turbine, or turbine wheel does not change, neither does the housing size. It's when the nozzle vanes (which are fixed ) are closed down. This directs exhaust gases onto the turbine wheel.



Texas Tornado

 

[HVAC]

Me Misleading

I reread a post of mine where I said the *turbine housing changes*. As TT pointed out, the housing is the same, the throat or nozzle changes in width as the sliding assembly moves.



The part to appreciate is this mechanism simulates a multitude of housings in the way it causes the turbo to respond over a wide variety of driving conditions. I particularly like the concept of keeping the drive pressure in check under hard throttle or WOTOo.



BTW, anyone thinkin' this turbo might make a terrific single for a hot rod Ram... ..... NOT!:{

 

[JPM]

Harley Aerochargers

Originally posted by djbobo

I can tell you that the variable geometry turbo on my harley puts out a good amount of boost at low rpm and almost eliminates "turbo lag" all together'

When I went to Cummins West last week they had a cut away of the VGT and it looked alote like the one on the bike. They said it will be in the Dodge trucks soon. FWIW



dj



Hey HVAC how would you set up twin VGT"s (maybe in parallel - 3cyl per turbo)

I wouldn't hope for variable geo turbos on a vehicle to be depended on. Anytime you have moving parts in the exhaust you'll have failures, my Aerodyne's move-able vanes got too hot, and were all distorted . I like the idea of no stuff in the exhaust turbine housing except the turbine wheel