Author Topic: a different kind of VNT control (Read 11582 times)

blackdogvan · « **Reply #15 on:** April 02, 2009, 09:28:04 am »

Here's the control mechanism i'm currently working on. If I could clone myself it would be done but the government says I have to wait...

I still need a flip flopped vacuum actuator & it'll take a bit of tinkering with the arm length & pivot point to get the travel right.

mothediesel, are you using a wastegate actuator there? I do like it!

You've been holding out on that build for way too long!

zukgod1 · « **Reply #16 on:** April 02, 2009, 10:31:17 am »

I really like this one!!

Quote from: "blackdogvan"

Here's the control mechanism i'm currently working on. If I could clone myself it would be done but the government says I have to wait...

I still need a flip flopped vacuum actuator & it'll take a bit of tinkering with the arm length & pivot point to get the travel right.

mothediesel, are you using a wastegate actuator there? I do like it!

You've been holding out on that build for way too long!

zukgod1 · « **Reply #17 on:** April 02, 2009, 12:05:51 pm »

Quote from: "libbybapa"

I wish I had clones also...

Andrew

Oh my!

Not of me. The world doesn't need anymore dicks! One of me is enough...

arb · « **Reply #18 on:** April 02, 2009, 12:11:19 pm »

Quote

Hell no! That's a great looking car and I'm glad to see it on here --

Those 4 cam Carrera motors are awesome, but for $200k he still won't see 160ft/lb @ 2500 like I will for less than a grand :wink:

Man, for $200K I'd drop a Pratt& Whitney PT6 with 550 hp burning JP5 !! You'd need a really big fuel tank, but on that "budget" it should not be an issue.

Outstanding project, though. Really good engineering you've done. Keep the updates coming.

moTthediesel · « **Reply #19 on:** April 02, 2009, 04:55:35 pm »

Quote from: "blackdogvan"

Here's the control mechanism i'm currently working on. If I could clone myself it would be done but the government says I have to wait...

I still need a flip flopped vacuum actuator & it'll take a bit of tinkering with the arm length & pivot point to get the travel right.

mothediesel, are you using a wastegate actuator there? I do like it!

You've been holding out on that build for way too long!

That's an interesting mechanical logic circuit, I'll have to think about it for a while!

I'm not using a wastegate actuator, I'm using the vacuum can from the VNT, but I used a spring to compress the rod into the can. Then, by introducing boost pressure to what was the vacuum port, the rod is forced out, as in a typical wastegate can.

If there is interest here I'll post some more build pictures as I go along. Next up on the punch list is the plumbing for the 944 intercooler.

moT

blackdogvan · « **Reply #20 on:** April 02, 2009, 07:36:05 pm »

Quote from: "libbybapa"

Yes, me too. I'm working on a version of that one for my next project as well. I wish I had clones also...

Andrew

How far along are you on this? Its been a while since we first talked about it & I'm excited to live vicariously. Mine got put aside for an m-tdi...

moT, how much travel are you getting out of that vacuum actuator? Thats a great way to turn it into a boost controlled actuator without having to get into its guts.

Hey · « **Reply #21 on:** April 02, 2009, 09:31:51 pm »

I have build an electronic VNT control.

It can work with a tdi injector to calculate the injection time OR with a simple variable resistor on the pump.

You can use the vacuum and N75 or AAZ valves for idle ,etc.

I can put the schematic for those who are interested.

Vincent Waldon · « **Reply #22 on:** April 02, 2009, 09:36:20 pm »

Quote from: "Hey"

I can put the schematic for those who are interested.

S'il vous plait !

Hey · « **Reply #23 on:** April 02, 2009, 09:59:07 pm »

I just don't want anyone selling it...

It is open source not for sale! I made correction on these schematics... so it's supposed to be even better to the one I already built.. but they might be a bug.

Check the schematic if you want to try it very soon. In about 2 weeks I will build this new version and report. I am 99% sure it's ok.. but we never know.

Have fun.... you will need to program a chip to make everything work. I might send them already programed.

Selenoid 1 and 2 are where the valves or N75 needs to be plugged.
SL4 would be where you plug the variable resistor on a pump.
SL1 is where the tdi #3 injector plugs in
THe system can control presure starting at 3psi... a symetric voltage supply would be needed for 0-3psi.. I don't think it is usefull

N.B. If you want to instal a variable resistor on the pump, part 2 of the schematic is not necessary.

fatmobile · « **Reply #24 on:** April 02, 2009, 10:04:58 pm »

Thanks guy, for clearing that up.
I understood everything about how the boost can worked but couldn't figure out how the throttle cable hooked to it.
sooo the roller rides on a cam that is moved by the accelerator cable,..
any pics of that piece?

blackdogvan · « **Reply #25 on:** April 03, 2009, 08:53:24 am »

Quote from: "libbybapa"

Quote from: "blackdogvan"
How far along are you on this? Its been a while since we first talked about it & I'm excited to live vicariously. Mine got put aside for an m-tdi...

I'm juggling a few projects and so it's hard to tell how long things will take. But, I've got the engine for that project assembled as a longblock. I'm currently assembling an injection pump and then the vane control system is the last bit to do before shoving it all in the car. I'd guess that will all happen in the next 2-3 weeks.

Andrew

Sweet, can't wait to see it!

Hey, pretty spanky circuit, do you have a logic diagram for its operation for us mere mortals? Do you plan on taking it to the PCB level? Those diagrams made me want to just go find an ECU for my m-tdi! :wink:

Hey · « **Reply #26 on:** April 03, 2009, 10:17:43 am »

I think a will make a DIY post of it.. I will include the PCBs, materials needed with price and how to actually MAKE a printed circuits with few chemicals.

Lot of fun!!

I think about 50$ to 70$ to build it the first time (about 40$ in parts) and 4-6 hours to develop, drill the MANY holes and solder everything.

I will take picture when I make the next model... waiting for some parts.

jasonsansfleece · « **Reply #27 on:** April 04, 2009, 11:17:52 am »

Hey
This is very interesting and I look forward to DIY post,
Guy

jtanguay · « **Reply #28 on:** April 04, 2009, 11:59:23 am »

Quote from: "Hey"

I think a will make a DIY post of it.. I will include the PCBs, materials needed with price and how to actually MAKE a printed circuits with few chemicals.

Lot of fun!!

I think about 50$ to 70$ to build it the first time (about 40$ in parts) and 4-6 hours to develop, drill the MANY holes and solder everything.

I will take picture when I make the next model... waiting for some parts.

i'd probably test the circuitry on a breadboard first and then get one of those online places to fab up some PCB's. the more you buy the cheaper they are. that might be the best way to go

fatmobile · « **Reply #29 on:** April 04, 2009, 11:24:09 pm »

When I made my low coolant level/overheat warning light circuits for the Rabbits,
I used these guys:
http://www.expresspcb.com/

They had some software to download that made it real easy to draw up my own board.
Sent it to them with some cash and got some boards in the mail.
Worked great for the small test batch I made to work out any problems.

Author Topic: a different kind of VNT control (Read 11582 times)

arb