hello i'm am on a search to confirm information i learned a couple years ago but never had to use till now. My brother(a computer engineering student at U of Michigan) wants to know what motor was on the VGT turbo that controls the variable vanes. Is it PWM or DAC. also what are the specs on the wheels. Also want to confirm that there is a vane position sensor. And can the exhaust housing be clock different that the center section. thank you that is all.

PS he would be willing to make a controller for none VGT trucks. especially if someone could let him barrow a VGT in the Ann Arbor area.

Brad

 

new turbo is not a variable vane turbo... the Holset has variable nozzle

 

VGT was used on the Fords. Their reliability was suspect at best.

 

it is though still a variable Geometry turbo. i'm lookin for info not an argument on terminology.

 

I'm not arguing. I'm informing you that there are not any variable vanes to be controlled like on the Duramax and Powerstroke. There is a sliding nozzle that I believe is actuated like an internal wastegate.

 

i'm aware of how it functions and types. i work on Class 8 trucks for a living. I'm looking as to how these function motor wise because all the ones i encounter use air pressure.

 

I think my actuator took a dump on me over the winter. Sometimes it engages like I have activated the exhaust brake function all by itself at idle. I will get P0106 and a dpf code...which I have determined [at least I think I have] that these codes are thrown because the turbo and/or actuator are choking the engine. Once I start to put some throttle to it, it 'opens' but as soon as I get back to idle or a stop light etc it will 'tighten up' even tighter then when the e-brake is activated. The replacement turbo and actuator arrived here today. I am hoping this will solve my problem but I want to know how it works and if the one I am taking off can be repaired/salvaged or altered to work again. I need to learn more how these turbo's work.

Scotty

 

The "actuator" you speak of is a module/controller of it's own. It's not just a motor directed by the ECM. Last I knew they were calibrated to the turbo from the factory. There is a method in the scan tool to "sync" the module, but the last word I had on that procedure was that it didn't work and if there was an issue with the controller, or the turbo that required you to remove the controller, it was "turbo time".

 

but I think hes asking just HOW is the geometry changed!!! Thats all he wants to know...

ie, is it a solenoid that opens to let X amount of oil pressure in which moves a small piston, is it an electric stepper motor, etc...

If I had to guess, I would say a PWM control signal, only because thats how other variable geometry turbos are controlled...but like I said just an educated guess.

ben

 

i want to know what electric motor is in the turbo that's all i need to know. I'm a diesel mechanic but all i see in our shop are ones that are air actuated. because i'm gonna end up pulling the control mod. out and replacing it with one that my brother and i have engineered to control the turbo. i need to know if its PWM or other. i know that the ECM communicates with the turbo through can bus but how does the turbo mod actuate the motor. i know how they vanes work and actuate and that stuff i just need to know about the motor and dont want to open one till after i have control scripts wrote and tested.

 

Check the Cummins/Holset site.

 

I don't know if it has been posted on here yet put I'll post concise answers to most of your questions.

1. It is a variable geometry turbo with a slide controlling the turbine inlet area.
2. The turbine housing can be reclocked a million times without worry of any ill effects to the controller
3. There are no magnets or other position sensors in the turbine housing (it can get like 1800 degrees all that would melt if there were).
4. The controller uses magnets on the gear reduction system internal to the controller to assess the position of the VGT drive gear.
5. These magnets fly by hall effect sensors on the board to again tell it what position it is in.
6. The controller operates on CAN messages it gets from the ECM there is no PWM or other voltage modulation.
7. The motor in the controller is a 3 post stepper motor that uses positive and negative voltages applied at any of the three posts to increment its movement along.

if I missed anything post back and I'll see if I can't fill in the blanks.

 

THANK YOU this is exactly want i was looking for

 

i am looking to put one of these on a 12 valve do you know flange dementions

 

3 9/16ths by 2 5/32nds

ish