Author Topic: Electronic Actuator VNT (Read 4439 times)

aidan · « **on:** May 04, 2008, 02:38:22 pm »

Anyone tried one?
These are on many newish diesels these days, and would probably be the easiest way to get a vnt on a car not originally equipped with one.

I guess its a small motor, so anyone care to guess the wiring situation? 12v, ground, TPS, map?

hamradio · « **Reply #1 on:** May 04, 2008, 08:40:23 pm »

Ummm, aren't they normally run by vacuum, and then a little solenoid bleeds off vacuum?

Edit-
Thought I was in the idi section, and you were trying to put it onto an idi. :oops:

OM617 · « **Reply #2 on:** May 05, 2008, 04:30:25 am »

Its not as simple as you think. You would have to build your own computer to control it.

JoeVat · « **Reply #3 on:** May 19, 2008, 08:01:39 pm »

i've run 2 vnt20's on my 05 BEW tdi pd with and without the electric actuator. car came stock with borg warner KP-39a turbo. works fine no probs.

kermatdi.com

jtanguay · « **Reply #4 on:** May 19, 2008, 08:11:27 pm »

easiest way is for the mechanical actuator. uses the accelerator pedal attached to the vane lever & a boost can to control boost level.

quickest and dirtiest way is to just use a boost actuator for the vane controls. boost spikes and possible stuck vanes though.

aidan · « **Reply #5 on:** May 20, 2008, 02:03:48 pm »

But... my car is drive by wire. The boost is controlled the old fashioned way though, hose straight from compressor housing to actuator.

I posted in this section purely for vnt info, my car isn't actually vag tdi, its a 2003 electronic IDI, may have good potential; 4 cyl 2.5, 12v, crossflow...

gigaz2 · « **Reply #6 on:** May 20, 2008, 03:31:24 pm »

you have to be specific to get good answers :roll:

your best bet would be a microcontroller to do all that, as OM617 already said.

jtanguay · « **Reply #7 on:** May 20, 2008, 07:20:31 pm »

if your boost is controlled old fashioned way and the pump is drive by wire then you will have to pay quite a bit of money to have the VNT run the way it should. or you could put a boost can on the actuator and have it work like that (cheapest)

there was a thread a while ago on how to build an electronic controller. wasn't cheap though

shadowmaker · « **Reply #8 on:** June 03, 2008, 06:03:31 pm »

We have an electrical control box for vnt, but it's really expensive and has to be set individually for every vehicle. It's been made for 3.0TD MBs with large vnts, but can control any vnt.

Apexi AVC-R isn't fast enough/clever enough to control vnt.

My van is -96 model, but it now has electronic vnt control inside original ECU. Actually old EGR chart is now converted to control vnt (as I don't have EGR anymore). Works like a charm.

Gearhead · « **Reply #9 on:** June 03, 2008, 11:45:08 pm »

How much is "really expensive?"

shadowmaker · « **Reply #10 on:** June 04, 2008, 02:39:44 am »

Quote from: "Gearhead"

How much is "really expensive?"

Would 2000e do it for you... :shock:

This includes hardware plus tuning. Sadly it's not something you can just plug in and play...

My part with it is only to deliver huge vnts for these Mercs (GT35v-GT40v) and that's it. But I have been in one of them and that thing just hauls. Here's a dyno (12v engine and GT37v) without any additional fuel delivery system (which limits top hp to about 430hp with 7mm elements). This is with 3bar maximum boost and about 3bar EMP. Absolutely no smoke, not even at the beginning.

Fuel delivery is kept low on purpose as original turbine (these things are almost always AT, because MT is weaker and can't be reinforced) is already over its limits and just now a beefier one has been installed.

VAG cars with EGR are different as vnt software can be put into your original ECU. My GT23v-AMG is working this way and I have about 350hp (with 2bar operating boost) on my 2.5TDI van. Next step is with GT35v and hopefully it gets me over 400hp and under 13s @1/4-mile.

snakemaster · « **Reply #11 on:** June 05, 2008, 07:48:41 pm »

aidan you could hook up a throtle cable to your fly by wire pedel and run it throw the bulkhead and to your vnt and get a spring on that sucker to :lol: