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#30
by
vanbcguy
on 04 Jun, 2013 15:09
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Very tempting... Bug me next month!
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#31
by
vanbcguy
on 20 Jun, 2013 19:11
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After lots of thought I'm going to go VNT using an Arduino controller. Ordered the Arduino, a Fastscale pressure sensor and some GM style N75 solenoids, still need to sort out what I'm going to do for a TPS.
I'll post my experiences with the controller as I build it - I'm an IT guy by day so really this is right up my alley.
Oh and the Wagon is now fully paid for so all free cash will be going towards the build now. Woohoo!
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#32
by
bbob203
on 21 Jun, 2013 01:25
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rover pumps have a tps built in to the throttle plate.
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#33
by
bbob203
on 21 Jun, 2013 02:00
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id talk to libby though if you got a pump from him he caould probably make one when he builds the pump. would love to hear more on this controller.
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#34
by
vanbcguy
on 21 Jun, 2013 05:58
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id talk to libby though if you got a pump from him he caould probably make one when he builds the pump. would love to hear more on this controller.
Yeah I was planning on that!
The controller is pretty cool. The Arduino for those who aren't familiar is a simple microcontroller designed for hobbyists and the education market. They have a number of analog inputs and digital inputs/outputs. The digital pins can be used for PWM (pulse width modulation) control of "things" - the factory VW ECU controls the N75 solenoid using PWM. Oh and they are CHEAP.
The controller I'll be building will have a solenoid for the turbo (and actually should be adaptable to really any turbo), plus also one for the LDA. It will be using my otherwise unused #3 injector for the RPM signal and then a pressure sensor to measure boost, and a yet-to-be-determined TPS. The controller has a map of boost : RPM and boost : throttle position, much like a factory ECU would.
My goal is to have a setup that can completely fail electronically with no ill effects other than a loss of power - the car would still be completely driveable just like any other mechanical diesel, only it wouldn't be able to close the vanes on the turbo. I'm trying to use as many commonly available parts as possible too (like the GM boost control solenoids).
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#35
by
bbob203
on 21 Jun, 2013 06:43
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id talk to libby though if you got a pump from him he caould probably make one when he builds the pump. would love to hear more on this controller.
Yeah I was planning on that!
The controller is pretty cool. The Arduino for those who aren't familiar is a simple microcontroller designed for hobbyists and the education market. They have a number of analog inputs and digital inputs/outputs. The digital pins can be used for PWM (pulse width modulation) control of "things" - the factory VW ECU controls the N75 solenoid using PWM. Oh and they are CHEAP.
The controller I'll be building will have a solenoid for the turbo (and actually should be adaptable to really any turbo), plus also one for the LDA. It will be using my otherwise unused #3 injector for the RPM signal and then a pressure sensor to measure boost, and a yet-to-be-determined TPS. The controller has a map of boost : RPM and boost : throttle position, much like a factory ECU would.
My goal is to have a setup that can completely fail electronically with no ill effects other than a loss of power - the car would still be completely driveable just like any other mechanical diesel, only it wouldn't be able to close the vanes on the turbo. I'm trying to use as many commonly available parts as possible too (like the GM boost control solenoids).
Sent from my HTC One X using Tapatalk 2
Brilliant ideas! This sounds like something i would very interested in! What vnt are you going to use?
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#36
by
theman53
on 21 Jun, 2013 07:07
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Lord Verminaard and I were looking into this a few years ago. He has a couple audrino chips and knowledge. He never is on here anymore but I could contact him. I have a parts list saved in my old browser of internet links to parts. I wasn't going for ease of finding replacements I was going for best part as most of the pieces are Bosch. If needed I could post all the links, but here is the one to adrino.
http://dmn.kuulalaakeri.org/vnt-lda/
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#37
by
vanbcguy
on 21 Jun, 2013 07:46
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Yeah the GM solenoids are cheap (under $30) and I found that tons of folks with other turbo cars have been switching to them as they perform better than the various other stock pieces. Google "GM 3-port boost solenoid" and you'll find them all over the place.
That link is the source code / base design I plan on using. :-)
It is actually so crazy simple once I got my head around it. I had a light bulb moment when I looked at the schematic and realized it is just a way simplified version of my pinball machine! Once I got that then it was all over. The fact I can get a complete VNT that bolts on without a ton of work helps too.
Right now I'm planning on a GTB1756VK. There's a guy over on the tdiclub forums selling a package that has the turbo, manifold, oil lines and the turbo converted to a vacuum can already. And it clears the factory Mk3 engine mounts.
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#38
by
libbydiesel
on 21 Jun, 2013 08:03
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The electronic vane control I have been working on will be functionally quite similar to the one linked. I will be writing my own code with things arranged a little differently, tho.
My goal is to have a setup that can completely fail electronically with no ill effects other than a loss of power - the car would still be completely driveable just like any other mechanical diesel, only it wouldn't be able to close the vanes on the turbo
I have the exact same priorities. I love electronics and wiring, I just don't want the operation of my vehicle to depend on that added layer of complexity and additional components. Using electronic management of non-vital components with a fail to safety is truly an excellent way to go. I wish VW/Bosch had kept the accelerator cable and mechanical pump and added the electronic on-the-fly timing control to it with a failure mode that was just normal mechanical pump operation.
Right now I'm planning on a GTB1756VK. There's a guy over on the tdiclub forums selling a package that has the turbo, manifold, oil lines and the turbo converted to a vacuum can already. And it clears the factory Mk3 engine mounts.
Running an well intercooled 20psi or so with fuel to match with that turbo and vanes properly controlled will be a very enjoyable level of performance.
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#39
by
vanbcguy
on 21 Jun, 2013 09:40
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Hey libby, curious if you have found a TPS solution yet?
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#40
by
libbydiesel
on 21 Jun, 2013 10:22
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Well, yes, but I will reserve further comment until I have done more testing.
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#41
by
vanbcguy
on 24 Jun, 2013 15:58
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"N75" valves showed today. These are GM boost control solenoids used on a variety of turbo GM vehicles over the years. ACDelco part number is 214-474 and they are available for under $30. The pigtails I got are technically for GM windshield washer pumps but they are identical to the solenoid connectors.
They can be used as either "normally open" or "normally closed" solenoids so you can really use them for any old thing you might want. I'll be using one for the turbo and one for the LDA. In addition to having the Arduino regulate the LDA I am contemplating using my Auber EGT gauge to cut off the LDA if EGTs exceed a safe value. I need to look over the Auber documentation again though as I don't want it to end up "fluttering" right on the edge of the limit, can't recall if I can set a band or not.
**EDIT: Yup, you can set a pull in and a pull out variable... Though the other thought I had was using the gauge as a turbo timer to keep the engine running till EGTs dropped below 300 ° which I can't do if I use it for LDA control...
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#42
by
8v-of-fury
on 24 Jun, 2013 16:04
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Pretty sure it is set to give out a 5v signal when the alarm is activated.
I dig where you are going, mind if I copy you to the T? haha. Really cool ideas you got Bryn, all the best with it.
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#43
by
vanbcguy
on 24 Jun, 2013 16:07
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Pretty sure it is set to give out a 5v signal when the alarm is activated.
I dig where you are going, mind if I copy you to the T? haha. Really cool ideas you got Bryn, all the best with it.
Absolutely, copy away... I'm just assembling ideas that are already out there on the Interwebz!
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#44
by
8v-of-fury
on 24 Jun, 2013 16:14
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It is true they are out there, but who has the patience to look and put it all together?
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Sooooo much more fun than a muscle car, and for a fraction of the cost eh? lol!