Building an M-TDI pump

[8v-of-fury]

Excellent idea! im gonna use that for sure

[snakemaster]

Can a 1999 FREELANDER 2-0 XDI fuel pump be used?

if its the rover engine the pump turns ACW , and if it is the bmw engine no

i have taken every thing out of a land rover 2.5 tdi pump and fitted it to a pug 306 pump that fits the 1z and runs 130hp all day long ,i did do the gov mod on it to

[8v-of-fury]

What is the best m-tdi pump to build??

I see no reason why a 1.6 body with the 17mm shaft and 10mm tdi head and goodies can't supply the same fueling the tdi pump did..

but I guess most are going  for big power with the tdi pumps.. and then they need to build the rover pumps or the cummins pumps.

[jimfoo]

I was playing around with my junk mostly rusty pump to remember how they go together last night, and decided to shim the governor most of the way to swap with the one in my real pump. While looking at the M-TDI thread and pics of lengthening the link between it and the throttle shaft, I started wondering if shimming the empty idle spring part(AAZ) might change anything since there is so much play between the lever and where the governor first starts to contact it. It would change the starting position and angle, which may give more movement, but I'm not sure. I may cut the cover so I can see, although I'm not positive I want to do that. What are other's thoughts on this?

[jimfoo]

Also in the original M-TDI thread, I'm glad to see I wasn't the only one to have problems of loosing the clip for the cold start. I thought it was just something I did wrong. I think I eventually machined some kind of plug for the hole.

[410]

I was playing around with my junk mostly rusty pump to remember how they go together last night, and decided to shim the governor most of the way to swap with the one in my real pump. While looking at the M-TDI thread and pics of lengthening the link between it and the throttle shaft, I started wondering if shimming the empty idle spring part(AAZ) might change anything since there is so much play between the lever and where the governor first starts to contact it. It would change the starting position and angle, which may give more movement, but I'm not sure. I may cut the cover so I can see, although I'm not positive I want to do that. What are other's thoughts on this?

The idle spring in the aaz pump is actually on the fast idle circuit.  You should be able to shim up the governor without affecting the idle.  That empty section gets tensioned up by the governor as soon as it fires up. 
I never did have problems with that clip on the cold start but I did end up with a leak in that area.  I ended up removing the whole cold start setup and installed a advance spring cap from a donor 1.6 pump.  Did you use the 1.9aaz advance piston and spring in your pump?

[jimfoo]

Yes I used the AAZ piston and spring, although I have a modified one from my junk pump that I was going to put in which would allow it more advance, if it even needs it.

[regcheeseman]

I have at my disposal an entire 1998 AHU TDI. I have all the electronics necessary to run the motor out of car, as I have had it running on the stand. I was going to do a full on electronic swap but have found I would much rather build an m-tdi for simplicity sake.

You'll find at the end of this build that there is a lot of BS spouted over over the internet, based on chinese whispers, mis-quotes and implied experience.

With this in mind, fit the TDI pump and all the electronics and don't waste time and decent pumps trying to build some flawed mTDI compromise that will never work PROPERLY.

I would not start with any off the VAG origin pumps as a basis for a mTDI, it will smoke like hell.

Good luck with the build.....   

(me, bitter about the Frankenmotor advice offered on this very forum - no, not much!)

[jimfoo]

If it can't smoke, it's not a diesel!   

[BigVWman]

You'll find at the end of this build that there is a lot of BS spouted over over the internet, based on chinese whispers, mis-quotes and implied experience.

With this in mind, fit the TDI pump and all the electronics and don't waste time and decent pumps trying to build some flawed mTDI compromise that will never work PROPERLY.

I would not start with any off the VAG origin pumps as a basis for a mTDI, it will smoke like hell.

Good luck with the build.....   

Smoke isn't always a turnoff for all of us! I like to have the ability to show off my cloud! How would it be a flawed compromise If it hits torque numbers similar to the all electronic version? Just because VW didn't engineer it that way doesn't mean we can't

[regcheeseman]

How would it be a flawed compromise If it hits torque numbers similar to the all electronic version

By 'similar' you mean 'quite a bit less than'

You forget to mention fuel consumption?

Whilst I've no problem with a bit of off boost soot (as mates driving behind will testify  ) but the mTDi just chugs. -

Heaps of smoke is not considered a good look by most normal people, and over here can get you a ticket or your car seized.

[410]

Well, if the pump is built right it can run with lots of power and minimal smoke.  I know first hand.  I spent a lot of time reducing smoke in off boost situations and had excellent results in the end.  I found the timing to be the most difficult to adjust but in the end that worked out fine as well.

[BigVWman]

From what i have been reading it is possible to get some very decent even greater than stock tdi numbers out of an mtdi pump as well as normal fuel economy comparable to ecu control. Maybe i'm wrong since i haven't personally seen it or verified have only read what others are saying around the web. It is my plan to try it and see. I have seen folks ticketed for very excessive smoke, even been pulled over by the state boys a couple times myself but they usually let you on your way once you prove its a diesel not a badly maintained gasser!

[theman53]

http://www.vwdiesel.net/forum/index.php?topic=29246.0

This guy built M-TDI and I have seen it in person. It is good and I didn't see any smoke when he pulled in. He has also commented on it several times and says it drives, smokes, and goes pretty well.

Reg. I understand your frustration, but I have seen the 1.6 bottom and 1.9 head not smoke badly like yours did on cold startup. It was over 50F but no real smoke. Plus the guy had the correct thickness gasket and everything. Mine is complete 1.6 bottom and top and it smokes year round at startup. Not as bad as yours did, but I always have a whitish grey haze, if you look close enough, even when warm. I guess if it was bad and the cloud didn't go away I would do something. But if I needed a car to not smoke at all I would buy a gasser.

[R.O.R-2.0]

http://www.vwdiesel.net/forum/index.php?topic=29246.0

This guy built one and I have seen it in person. It is good and I didn't see any smoke when he pulled in. He has also commented on it several times and says it drives, smokes, and goes pretty well.

Reg. I understand your frustration, but I have seen the 1.6 bottom and 1.9 head not smoke badly like yours did on cold startup. It was over 50F but no real smoke. Plus the guy had the correct thickness gasket and everything. Mine is complete 1.6 bottom and top and it smokes year round at startup. Not as bad as yours did, but I always have a whitish grey haze, if you look close enough, even when warm. I guess if it was bad and the cloud didn't go away I would do something. But if I needed a car to not smoke at all I would buy a gasser.

joshes engine ran beautifully.. correct head gasket, and everything. 1.6/9 hybrid..