mtdi, vnt17, no power with boost

[8v-of-fury]

http://www.vwdiesel.net/forum/index.php?topic=24323.0

^^ Read It ^^

Common problem. The other spring you can see? the shaft that rides down the middle of it is slotted on two sides so it can slide out of the black lever going up and down in the pump.




PS. What are you doing opening your pump without the knowledge required? 

[deepmud]

http://www.vwdiesel.net/forum/index.php?topic=24323.0

^^ Read It ^^

Common problem. The other spring you can see? the shaft that rides down the middle of it is slotted on two sides so it can slide out of the black lever going up and down in the pump.



PS. What are you doing opening your pump without the knowledge required?  

No fear! If it doesn't work - it doesn't have to take ME to work, you know? I've found that most thingsI take apart, I found out how they go together again. I even used to me a factory mechanic - I went to school! ...to learn to swap out parts But I've got a knack for this kind of stuff. My grandfather was a blacksmith even . As long as I'm careful I expect to put it back as good as it was, and perhaps better.

I know I'm being silly avoiding pulling the pump to work inside -- I need to be confident in the getting the timing of the pump correct - once I get that down I think I can mod these things pretty well.


EDIT: and thanks! I see the problem. I sorta' was expecting the shaft to pull out...seems it's should have, and it will have to....

[snakemaster]

man i love your work bench , its even got carpet on it , what happings when you get oil on it

[8v-of-fury]

HAh! Good luck to you!

Master of snakes, those are not my pictures. MY work bench is a thick lucious shag

[deepmud]

ok - got it out. Easy-peasy if you know to pull the shaft out.

The gov spring assembly.....



I can see the boost pin down under the boost diaphram - it moves freely. I don't know why the power is so bad...but next I'm doing the gov mod so cross your fingers and hope for smoke!

[libbydiesel]

It probably has crappy power because an IDI control lever assembly and accelerator lever were used both of which seriously limit fueling.  Please post a pic of the end of the accelerator shaft and where it attaches to the governor spring capsule.

[8v-of-fury]

When I originally had my m-tdi powered by a full IDI pump.. it was a dog. The 10mm internals did improve it, but nowhere near as good as the modified lever.. and then nowhere near as good as a stock Land Rover pump.

[deepmud]

Enough shims?

So the while I can see a longer actuator giving more "throttle" movement for a given amount of turn I think it just doesn't fuel much to begin with.
I did find my line to feed boost pressure to the pump was a little loose.... could be part of the problem.... it could just be I don't have a hybrid like I was told. There is nothing I can see that makes me sure it was taken apart. I did have to reindex the throttle just to get it to start and idle.
All my pics of the pump are on Photo bucket.
http://s85.photobucket.com/albums/k50/deepmud

http://s85.photobucket.com/albums/k50/deepmud/vw TDI conversion/

[8v-of-fury]

So to your knowledge it is a DI 10mm pump. Running a stock IDI internal throttle lever. I'd say that right there is the root to your evil. I could not for the life of me get any power from my M-TDI with the stock IDI lever, I doubt you will be able to either. I even shimmed my governor solid :O!

If it does have the 10mm DI cam plate, then that cam plate is huge and has a severe amount of plunger lift. The IDI throttle lever does not have enough movement to move the fuel control collar enough to act with it, thus severe under fueling.

[libbydiesel]

Thanks for the pic.  It is as I expected. 

[deepmud]

so the Direct Injected lever is longer? So that a given amount of input will provide a greater amount of fuel delivery?

I'll see if I can find a pic of a tdi fuel lever....in the meantime, I got the top back on. I need to find my starter-button, so I can start it from under the hood, and be ready to shut off the air if it starts to run away.....

[deepmud]

8v, this is from your thread  - maybe it's the pic, but I'm not seeing the difference in the lever.

EDIT:

took your pic, did "paint cad"

and am I looking at the right spot?

[deepmud]

I stuck my phone underneath the housing just during the install to get this shot -i was making sure I didn't roll/or cut the o-ring - does the throttle hit the housing? Should I clearance the gov cage and get a little more travel?

[8v-of-fury]

Check out this post, in my M-TDI thread;

http://www.vwdiesel.net/forum/index.php?topic=25420.msg284896#msg284896

[libbydiesel]

I would remove the lever from the end of the accel lever and cage and make a new one that is 1.5x as long on center.  Also, get a control lever assembly from a Cummins VE pump and you'll be getting there.