darkhorizon

There is a good good chance I will have a controller availible for a VGT holset soon.

SiFlyBy

I'm thinking very hard about trying the Megasquirt boost controller mod for use with a garret VGT. The only setback is #1-the size of the turbo vs. the space in my engine bay, #2-it will probably blow my engine with about 5-6 psi, #3-time and downtime. I have been playing with the turbo and all it needs is the proper PWM. I don't think it will be too hard. 2 wires: B+ and PWM ground.

darkhorizon

Go post stuff on dsmtuners, we have a few threads that need "true results" posted in them.

aero

If you are talking to me, I've posted in the Holset threads quite a bit. Mainly just spool stuff about this turbo though. I never got to take it to the track to get any results there thanks to the rod bearing failure.

Where did you get the information about the signal it takes? Have you actually played with it to see if it moves? Do you have the pinout for the connector? Maybe I missed some of that in the prior posts in this thread.

series8217

So Garret uses a PWM control for the VGT? That would make things easy to actuate. Is there an RPM sensor on that turbo as well? Please post any more information you have.

Sounds like he's referring to a Garret turbo, not the Holset. Still might be useful to know how Garret does it though.


Riiight...

aero

Damn. I somehow missed that.

series8217

Did either of you guys with Alldata or MItchells get a chance to see if the wiring diagrams are there for the 2007 Dodge Diesel truck with the 6.7L?

HiProfile

Jeff Depis in WI, has a blue GT with silver decals (like rip marks?). Some guy tunes it via mail lol. He runs it then sends him the memcal. IIRC they were the dohc heads from ~95 Impala. Does that ring a bell? I know he's on some forums.


Anyways, a controller based on a MAP signal would be ****. A gauge-mode MAP would have it open at idle, closed at 0psi, and opbviously open with boost. I'd guess there are PWM controllers that base it off an input voltage, rather than resistance like the basic setups I've seen.

SiFlyBy

Yeah, I'll get those up tomorrow. If I remember right it was 4 wires?

As for the Garrett VGT info...The turbo is from a Ford 6.0L diesel. It has only 2 wires: 12V and a PWM ground. There is no rpm measurement. Hell theres not even a vane position sensor. The only way the PCM knows of a malfunction with the vanes is through MAP(Manifold Absolute Pressure), EBP(Exhaust BackPressure) and logic. I have rigged up a setup to see if its really that simple to control it...and it is. The VGT solenoid controls oil pressure to a chamber with a piston inside it. Think 'brake master cylinder'. So I used air pressure and a car battery, gave oneside 12v and the other I kind of tapped on the ground terminal and the actuator jumped back and forth. I don't see why even an AVC-R wouldn't work.

I was going to rig it up in my car as a test rig and see if I could get it to work, but my engine will MAYBE handle 300 whp and it seems like a waste to do all the fabrication, etc.. for something that I wont even use on the car. This turbo is surely good for 500+whp. I may just get rid of it now or save it the EVO I hope to have in a year or so.

aero

There used to be a thread on NASIOC where a guy used one of these on his WRX. I found it but all the info has been edited out of it now.

IIRC he used an AVCR, fully open boost would be at somewhere between 22-25 psi without an external gate using that Garrett VNT.