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TDI Power Enhancements Discussions about increasing the power of your TDI engine. i.e. chips, injectors, powerboxes, clutches, etc. Handling, suspensions, wheels, type discussion should be put into the "Upgrades (non TDI Engine related)" forum. Non TDI vehicle related postings will be moved or removed. Please note the Performance Disclaimer.

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Old June 7th, 2012, 10:50   #1
TDIMeister
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Default Somebody PLEASE do a direct PWM turbo controller already!!!

With VK turbo swaps becoming more-and-more common, I cringe at being forced to remove the electric actuator and replace it with a vacuum can actuator to get the turbo to work with these engines.

The signal from the ECU to the N75 is already PWM. The VK actuator is already PWM. How ridiculously stupid to communicate those two signals with vacuum instead!?!?!

It's like having an English-speaker wanting to say something to another English-speaker, but having a translator in another language in between. REDUNDANT!!!

Let's do it already. Let's make it a goal to get something done by TDIFest this year. This is $MONEY$ people!!!
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Old June 7th, 2012, 11:03   #2
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Old June 7th, 2012, 11:04   #3
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Anyone know the PWM frequency of the ECU and the turbo actuator? I suspect there's already something out there that can be used directly or adapted without much trouble. For instance this...
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Old June 7th, 2012, 11:26   #4
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i would love to get rid of the n75 and use an electronic actuator for my scirocco swap, since i'm planning on a 2260vk of some sort.. i'll be a guinea pig if *cough* someone wants to do my tuning
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Old June 7th, 2012, 11:27   #5
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This should be fairly simple but a lot of work.

Is the Frequency of the N75 system and the electo-mechanical system the same?

Is the duty cycle and requested boost of each system the same for both systems or for that matter are they even linear?
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Old June 7th, 2012, 11:28   #6
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Beyond just the multiplier, range and scaling may be an issue...
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Old June 7th, 2012, 11:30   #7
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Old June 7th, 2012, 11:38   #8
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I would think that the vacuum/spring system acts as a buffer of the forces required to adjust the vanes inside a pressurized turbo with a lot of exhaust volume wanting to move the vanes.

I see this needing something pretty robust and or strong(read expensive) to be able to directly compensate for the forces reacting on these vanes.

I also don't see a strong enough linear actuator that is small enough to fit in our compact install area, and be able to hold up to the heat that is nearby in the long term

with that said, someone prove me wrong..
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Old June 7th, 2012, 11:42   #9
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Several models have direct acting servos on their turbochargers. MB uses them and I think the V6 TDI does as well?

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Old June 7th, 2012, 11:44   #10
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The BKW does. Two of them. They use their own paired wire engine communication bus to control them however. May not be able to work the same way.
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Old June 7th, 2012, 11:56   #11
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This was a topic on this board for a while
You can`t use the VW actuator because they have a Can signal.
The Mercedes actuator used a PWM.
You can build a Frankenstein bedween Mercedes electronic and VW Mechanic that can work.
It is shown on the vid.
http://www.youtube.com/watch?v=NQ36-fiV3Vk

http://www.youtube.com/watch?v=q0qEY...eature=related

The main Problem ist to adjust the ECU to work properly.
I used the old vacuum actuator because i haven`t so much space left with this turbo.
Best regards Christian
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Old June 7th, 2012, 11:57   #12
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I was just pulling up a V6 CDI Sprinter wiring diagram as you posted that, Christian!
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Old June 7th, 2012, 11:59   #13
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So these are CAN and not PWM?
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Old June 7th, 2012, 12:03   #14
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Not sure which one you have pictured, but the BKW's turbochargers (V10 T'reg here) have 4 wires to each actuator: power, ground, and hi-low CAN. Pretty simple, but you have to have the ECU to talk to them. The 5th pin is not used.
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Old June 7th, 2012, 12:05   #15
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I will change from vacuum actuator to electronic on my E320 EDC15.
Software architecture for EDC15 used with PWM electronic actuator is already done by OEM ;-)

Dave if you are interested I give you a hint via PM as I don't want to spread this around www yet ;-)

Regards Alex
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