ddestruel

two years ago this was a hot topic since then its died down but everyone always says there are alot of electronics and signals required to managed the VG turbos as well as run the sleeve that moves the housing.

I am just currious why the system cannot function off of pneumatics. specifically just like the WG actuator on our earlier year trucks?

Using an actuator similar to whats used for wastegates and a adjustable diaphram shouldnt it be possible to machine the housing to mount a simple sliding actuator and arm that can move the housing accordingly. then through the use of a n adjustable diaphram tune things so that as Intake boost pressure increases the housing is moved out, opening up the exhaust? and when pressure decreases the housing slides back in decreasing the passages?


From the diagrams the HY55 and the HX40 look nothing like the Garret variable vein/ variable geometry turbo where those aditional mechanisms and controls would be necessary.


Yes i know Twin's Twins Twins... ive had twins. twice now..... and ive had a HTB2 62/12 and a 62/14

but for the sake of debate these variable turbos can sometimes be had off of the commercial 5.9s for pretty reasonable, and so far every after market company seems to want to re-invent the wheel while no one has effectively brought to market a Variable Geometry turbo yet to speak of

just a thought for the day

drewblood

we use air pressure ont the detroit diesel and MBE engines and the main controls for running the vgt vanes are turbo speed boost pressure egr valve position and egr flow Ive been racking my brain on how to get a vpod (varriable pressure output device)to opperate a vgt turbo off a stand alone controler but dont have the abilitys to create a board to use as a controler instant boost from idle would rock and no waiting to spool up the big turbo is even imo a better option than twins

HOHN

I agree. If a fueling box can be made, a VGT controller could be done easily if the electronic route had to be done. Pneumatic would be simpler.


Why can't a VGT be configured to operate off drive pressure? Make the turbine is tight as possible until a certain Drive pressure is reached, the progressively make it larger and larger to regulate drive pressure.

Are you talking about the Holset setup where the turbine slides in and out rather than the Garrett setup where the vanes adust to "Steer" the flow into the turbine?

Justin

ddestruel

Exactly why cant the sliding of the turbine in and out of the housing be driven off of drive pressure.

Yes on the holset models. from the diagrams and the units i have seen it would seem logical.

drewblood

as long as over speed of the turbo can be acomplished Pneumaticly I was speeking of the garrett and the Vpod is a pwm electronicly controlled Pneumatic device. just a air pressure regulator for the most part I dont think turbo drive preasrue is enough to overcome the spring preasure holding the vanes or the sleave in the open most position as Im sure you know with no preasure to the vane/sleave its set to full open for turbo protection so it would need preasure to close so I think aux air and electronic controls are the solution

soulezoo

It would seem to me that as long as the journals have low drag, plain spring pressure could/would do the trick. I'm thinking, bear with me and this is just for relative comparison only, if journal/shaft lateral drag had a value of say 2lbs of pressure, and you wanted the shaft to start moving at a drive pressure of say 15 lbs, use a spring with a dynamic load of 17-18lbs of force. As drive pressure increases the vane opens/or slides, and as it decreases it will close/slide back. Why could it not be relatively that simple?

I would love to have a VG on top of my twins!!

cquestad

The MST from ATS is coming really soon...simple and effective. This is from the head yellow birdie himself...

ddestruel

http://www.holset.co.uk/files/2_5_1_5-VGT.php


http://search.yahoo.com/search;_ylt=...0&fr=yfp-t-501

soulezoo

Is there anything to look at yet??

If not, can you provide more info??

Minwy

It'll probably be out along with the Banks VGT and Suncoast allison conversion for our trucks.

w.tx iceman

I've been looking at that turbo since I had my 2nd gen, thought it was history