Mechanical to Computer TDI...

[745 turbogreasel]

Why add a computer to duplicate what your right foot already does? 

Because my right foot forgets what my brain is doing all too often?

[avocado]

Alright gentlemen....I got the pump, wiring harness and am waiting on the computer.  Correct me if I'm wrong, but all I should need to connect here is the VW gas pedal assembly, MAP sensor, coolant temp sensor.  Can I axe the N75 valve? 

This is going to be the tough part...

[Vincent Waldon]

If you've got a VNT turbo you'll need the N75 valve to control the vanes... my guess is that you'll get a CEL if the computer doesn't see it.... but just a guess.

[410]

There should be a crank sensor to plug in as well.  Absolutely needed.

[avocado]

No VNT....it's got the stock garret with a wastegate.  From what I've read, I still need a N75...although I'm unsure of it's usefulness.

I remember now the crank sensor.....

I'll be sure to give you all my honest impression with this once it's finished.  Kinda hard to get excited about tearing into a perfectly running vehicle for this tho.

[oldskool rich]

isnt it mainly down to the cam plate and pump piston for power? everything else is just controling those things
what difference does it make weather is electric or mechanical? apart from if you wana use a screw driver or a computer
i stand by disco pumps, weve got 65mpg out of ours on a run and produces 240bhp obviously not at the same time but its pretty amazing, only problem is the AAZ cam keeps snapping valves, now having to machine the pistons to get more valve clearance, sorry i know im thread hijacking, just wanted to say its all about the disco baby

[OM617]

dont worry about me, I never have much useful information to throw out there. I usually just make posts that add nothing to the topic, like this one.

Because it doesn't? 

False. All the ECU does is control movement of the fuel rack, exactly the same thing your right foot does.

[burn_your_money]

False. All the ECU does is control movement of the fuel rack, exactly the same thing your right foot does.

It also controls the timing, which in my opinion has the biggest effect on emissions, power, mileage, engine smoothness and noise.

[OM617]

The mechanical pump does that automatically.

[burn_your_money]

The mechanical pump does that automatically.

Yes but it's only inputs are RPM and on some pumps throttle position.

The eTDI uses RPM, throttle position, engine temperature, fuel temperature, boost pressure and a few others.

[oldskool rich]

well my mtdi gets better mpg than a stock 1Z so how do you explain that?

all i care about is power and efficiency and my pump kicks the *** out of both, i challenge any other pump to beet me at either

[MJF]

Hopped diesels usually gets better mileage than stock. E-TDIs too.

[avocado]

OK...I'm finally getting around to this.....

I have:

1Z engine

A3 VW TDI wiring harness (probably an AHU harness)

ALH injection pump

I started to paw through the harness and immediately found that the connector to the injection pump does not fit my ALH pump.  Does anyone know if this is something that I can just wire differently?  I recall people claiming it has been done elsewhere, but I'm not sure where to find this info...

Thanks!

I'll be sure to update this thread and my impressions once I get it fired up!

[MikkiJayne]

I think the trickiest bit of this would be the pedal position sensor that the TDI uses, and thats not even that hard.

The ECU only needs half a dozen wires to connect to the rest of the car, and if you get a US ECU without the immobilizer thats even easier (although very straightforward even if you keep it). Off the top of my head you have switched and permanent 12V, tacho (need a mk3 or late Corrado cluster), K-line (for diagnostics), glow-plug relay & glow plug light (doubles as CEL), and VSS for the speedo. All the rest is sensors and stuff on the engine itself in the main harness. You could use the temp and oil pressure sensors in the harness as well if you have the mk3 or Corrado cluster, so thats a couple more.

The ALH pump has a 10-pin connector, whereas the AHU / 1Z is a 9 pin. The connections are all still the same though. There is a write-up on TDIclub of how to convert from one to the other. You also need to machine the pump bracket as the ALH pump has a different snout and pulley mounting. Thats in the same thread iirc, although I don't have a link I'm afraid.

I have all the wiring diagrams if you need them

[avocado]

Thanks for the reply....

I found the write up and it is noted that the 1Z/AHU harness has two connectors to the IP.  One is an 8 pin and one is a 3 pin.  My job is to combine those pins into a 10 pin connector that will plug into the ALH pump.  Easy enough....I find the 8 pin (only 7 pins actually used) but cannot locate the 3 pin connector.  The wire colors do not match up to any 3 pin connector that I have on my harness.  Does anyone happen to have a picture of what the connector looks like or any other method to trace those wires back to their location? 

I am also concerned about my harness...there is a round connector that I assume plugs into the body harness of the car....but it would appear that my harness will be woefully incomplete as mine will end abruptly at that point.  EEK!  I do intend to strip all of the unnecessary bits out, but I'm afraid that something won't quite add up...

Making progress though...