7 porter progress, Engine build Number....seven?? ....now K1200
Turbo Mini Forums

Smart.

Is that servo going to be man enough though?
If not they do some larger ones for the 1/6 scale stuff.

In the 13's at last!.. Just

good question, the vane's don't need much to move them, and i don't think the manifold pressure will have much effect, but that servo was just a cheapo one to try out, about 4 quid i think.

would you want that servo close to a red hot turbo?

wheres the tgumbs up !!?(again) sheesh joe .lol, on a marginally more serious note , will the servo have enough ooomf to move the vanes ?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Why do I always forget the thumb :(

Robert, what did my last post say? ;P

Colin, you right I wouldnt put that servo near the turbine... but the better ones I might consider... also the above strategy (if it works ok) should also apply to VNT's that have servos fitted as standard :)

You could run it off a cable and mount the servo inside the cabin if the temps are too high.

Edited by kcchan on 16th Oct, 2011.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Good progress Joe.

So are you using a map of TPS vs RPM ?

Then at higher revs you can actually open up the vanes ?

It's a tricky problem. You want the vanes open at idle, closed when you want boost at low revs, but then open up as the revs rise. Am I right?

EDIT: Are you still using an external wastegate to limit the top end?

Edited by Paul S on 16th Oct, 2011.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Not using the external gate at all now,

If you use the open loop boost control you can jsut map the vane positions against TPS and RPM, but Ideally I'd like to use the Closed loop control, maybe I'll take a look at the code, see if I can make it stay open below atmospheric.

i wonder if the effect of the vanes is non linear ,and whether this would induce an issue with sensitivity?

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I tnink almost certainly to some extent it will be non linear, only one was to see if its an issue though.

Ok, interstingly the MS code has a bit that makes it not control boost bellow 100kpa (pretty much atmospheric) If I change the value in the code to somthing like 20kpa then setting the trget KPA in the boost map to anything more than 20kpa should open the vanes. so they are open at cruise.

I think...

On 16th Oct, 2011 robert said:


colin... new rule : any warning comment by you has to be balanced by an encouraging enthusiastic comment designed to raise the project builders spirits to a new all time high ., remember , i have heard you snigger at 3am

Edited by Sprocket on 17th Oct, 2011.

On 17th Oct, 2011 Sprocket said:

On 16th Oct, 2011 robert said:


colin... new rule : any warning comment by you has to be balanced by an encouraging enthusiastic comment designed to raise the project builders spirits to a new all time high ., remember , i have heard you snigger at 3am

Sorry your eminence, I was thinking out loud when I mae those comments, and forgot to mention what I was really thinking:$

"what about something like this http://www.hobbyking.com/hobbyking/store/_...Warehouse_.html "

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

Oooh! that does look good! good price too,

Cheers Colin.

Joe, have you seen those actuators that have a vacuum connection on side and what looks like a 3-wire PWM the other?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

Yeah, my 2559 cam with one of those, the odule on mine is a linear pot to measure position.

Right, well have you though about adapting a PWM idle valve to push on the boost side of the actuator diapragm?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

yep, but then I'd need 4 ines to drive it, or make a PWM to stepper convertor (which i have started but abbandodned)

No, I didn't mean a stepper idle valve. One of these PWM idle valves:

http://www.ebay.co.uk/itm/Saab-Idle-Contro...=item336d36d5de

Edited by Paul S on 17th Oct, 2011.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

ah, didnt read that right did I!

If I can do it using only one part I'd prefer that,

James Murrey on the MSextra site has said he can do me a version of the code with the below atmospheric boost mapping re-enabled, so I'm going to get a big servo on order and attached to the 2259 for when it goes back on and give that a go,

in the mean time I'm just going to try a mapped closed loop bleed on the 2052 that comes in at 50%+ throttle position, should be infinitly better that hat I have currently.

I've been following your thread on the MS forum.

Those PWM idle valves must have an internal spindle that moves in and out controlled by the PWM signal. They are proven with MS for idle control. So a re-write of the boost control would work well with it.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

I thought you might spot it over there,

Ive just thought, I might have one of those valves from before I went Idle stepper, If so Iyt might save buying the servo, and tbh it may have better resolution and speed than a servo, "goes digging..."

....And some spanners cooked his ECU....

Bugger.

Don't tell me...... you fitted the PWM valve directly to the processor output instead of using a TIP122?

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."