Sadly, I have not been able to test the controller because of leaks in the custom manifold I made. It has been too much of a hassle and school is starting very soon for me, so I have since gone another direction by going with a Holset HE351CW which has a T3 flange, making it easier and cheaper for me since I can use any normal T3 manifold. I'm pretty sure the controller would've worked ok. As for now though, the VGT project is on hold. Perhaps in the future once I finish college, I will complete the project. Sorry guys! Best of luck to those pressing on! PM me if you have any questions and feel free to use/change my program.

-Josh

Oh maaaan, I was so looking forward to this. :(

I have a car to put this turbo on now so I'm seriously looking at making a manifold.

Anybody see how the potentiometer gets feedback from the gear system? I would think it has to have a gear itself to get spun?

Nevermind. Been analyzing this...i guess you have to cut a key way so that the shafts interlock. Now to figure out how to do that with tight tolerances.

I would be interested in seeing this as well, as I am building this system too

Read the thread, however no info on the reliability of the vgt on a gas motor, so the question is how long have you had it on and miles driven, issues?

Not looking for a 1/4 mile turbo. but something for the track. with quick spool and hp potential 3 liter.

TIA

You do realize he never ran it...right?

Gentlemen,
I am currently working on a feedback look design that would work off of the impeller speed and use EGT and AFR as failsafes. Looking at using amplification circuits for selecting the desired shaft speed and then using EGT and AFR to shutdown the feedback look forcing the vanes to open. If you get the hall effect sensor to interface with your microcontroller, please let me know. My goal is to keep the setup as simple yet accurate as possible.

Hello gents,

I am looking to build a controller that runs off of numerous inputs, and uses numerous fail safes. As much as I have thought this out, it should work well. Although, the MAP sensor certainly is an idea as well (thought that out fully too). The reason I am choosing numerous inputs is so the controller can check itself, and balance the end effect on the turbo. This will create a more stable, and more easily tuneable car in the end since the turbo will be more consistently controlled.

I run one of these turbos on my Cummins Deisel truck (this isn't the OEM turbo though, its custom retrofit to a 12 valve), and will be using this on a Cobalt SS as well. I have a second Cobalt SS R&D car set up, with a built motor so we can push the turbo to the limits. Also will eventually be using this on my Civic road course car. So, needless to say, I will have plenty of R&D scheduled.

I fully expect this turbo to be a monster. I expect this turbo to support 550-600whp, and full spool by 3500rpm.

A few things...
In regards to the small size of the exhaust housing being an exhaust brake. this works on diesels due to their larger displacement. The smaller size of the housing on a gas motor would help with spool.

The carbon issue seen on diesels will not be nearly as prominent on a gas motor, unless you run it stupidly rich. Diesel is a sooty, dirty fuel in comparison to gas. But, i think the sweep of the vanes would be a cool idea, and could never hurt.

I like the pictures of the bracing. With the Cobalt being set up as it is, I am going to have to build a long tube manifold to get it to fit behind the motor, and that will create alot of stress on the manifold, so I have been thinking out some bracing strategies.

Keep an eye out for us to release something in the spring.

CAN-BUS Shield - SparkFun Electronics

I realize this all started with using a picaxe but somehow i think arduino might be a more viable option now instead or ripping out the OEM controller