internal pump questions

[carrizog60]

hi

i have seen the turboed polo 1.4d project and some questions came in...
i saw a picture of the governor flywheights shaved,why is that?
wont pre-load the main spring on governor does the same(delay fuel cut off)?

also he says:

Modified controller bridge for longer travel of LDA

is he talking the extended throttle arm?wont the stock arm at full swing hit full fueling position in the levers inside the pump?

and

Regulator Spring, changed from a separate idle spring into an integrated spring-in controller package (VAG 2.4 d)

why would one change this for performance upgrade?
mine doesent even have any spring on there,and i know it is from factory.
what controls idle on mine and why to add those from 2.4d?

and last,i see the pumps in the test bench,and some bars showing how many cc the pump is delivering.
some show very diferent values from each line and then after some tweaking,bars seem equal.

how can this be adjusted?
the plunger has different holes for each port,so i always assumed that fuel was the same to all ports and no adjustments were necessary,but it seems that i am wrong...

can somebody chime in and go for a talk?

[745 turbogreasel]

hi

i have seen the turboed polo 1.4d project and some questions came in...
i saw a picture of the governor flywheights shaved,why is that?
wont pre-load the main spring on governor does the same(delay fuel cut off)?
1 to extend the RPM range, 2 maintains gov function.

also he says:

Modified controller bridge for longer travel of LDA

I think this is carving the LDA housing deeper, but maybe just trimming the plastic snubber in there

is he talking the extended throttle arm?wont the stock arm at full swing hit full fueling position in the levers inside the pump?
Threre are a bunch of different arms Bosch uses, not exactly sure why

and

Regulator Spring, changed from a separate idle spring into an integrated spring-in controller package (VAG 2.4 d)

I can say my D24 has very good anti stall properties.  I can idle around in 2nd smoothly, although displacement is a factor as well.

why would one change this for performance upgrade?
mine doesent even have any spring on there,and i know it is from factory.
what controls idle on mine and why to add those from 2.4d?

and last,i see the pumps in the test bench,and some bars showing how many cc the pump is delivering.
some show very diferent values from each line and then after some tweaking,bars seem equal.

how can this be adjusted?
the plunger has different holes for each port,so i always assumed that fuel was the same to all ports and no adjustments were necessary,but it seems that i am wrong...
The delivery valves must be a matched set may be part of it.   EDMing the pump element to be  normal rotation IMO is the serious mod

can somebody chime in and go for a talk?

Well there's my guesses
One of the perks to joining DieselClubSweden is they have a subforum for 'Dieselmeken answers your question'.  I admit some temptation...

[carrizog60]

bring him over here lol

from you tube novies he seems a good attitude guy

now for the topic:

1 to extend the RPM range, 2 maintains gov function.

yes,but wont shimming the spring do the same thing?

I think this is carving the LDA housing deeper, but maybe just trimming the plastic snubber in there

i removed my plastic shim...but does the levers inside,even with the pin cut in a very agressive way,can reach full movement?
i checked with the top off the pump and the protusion of the pin moving the lever is not that much.my lda pin,the way it is can aloww full motion so i really dont  get this mod...

I can say my D24 has very good anti stall properties.  I can idle around in 2nd smoothly, although displacement is a factor as well.

yep,but no performance gains there...

The delivery valves must be a matched set may be part of it.   EDMing the pump element to be  normal rotation IMO is the serious mod

didnt understand this...
he shows on some youtube movies pumps not distributing fuel at an equal cc,what can be done to achieve that?

[745 turbogreasel]

bring him over here lol

from you tube novies he seems a good attitude guy

now for the topic:

1 to extend the RPM range, 2 maintains gov function.

yes,but wont shimming the spring do the same thing?
In the same way  a choke cable might work as a cruise control.

I think this is carving the LDA housing deeper, but maybe just trimming the plastic snubber in there

i removed my plastic shim...but does the levers inside,even with the pin cut in a very agressive way,can reach full movement?
i checked with the top off the pump and the protusion of the pin moving the lever is not that much.my lda pin,the way it is can aloww full motion so i really dont  get this mod...
more travel = better resolution

I can say my D24 has very good anti stall properties.  I can idle around in 2nd smoothly, although displacement is a factor as well.

yep,but no performance gains there...
An easier to drive car= a better performing driver, less fatigued, and more able to focus.

The delivery valves must be a matched set may be part of it.   EDMing the pump element to be  normal rotation IMO is the serious mod

the pressure held in each  fuel pipe might not be the same after a DV has become worn or damaged.  you need a flow bench to see the difference.
The DV needle and seat must be good, and I think the spring can be shimmed

didnt understand this...
he shows on some youtube movies pumps not distributing fuel at an equal cc,what can be done to achieve that?

[hillfolk'r]

I probably got a bunch of stuff i did but heres a little i remember
I removed the plastic collar and set it on fire
i turned the starwheel so the spring was fully relaxed
i had some spare springs,i played around stepping on them to" tune" them haha
i even cut a deeper notch in the fuel pin,but be careful,you have to polish it out afterwards.
i played with the smoke screw on top of the lda,but i found it would affect my mileage noticeably.
Most importantly:if ya turn the max fuel screw,you better lower the idle or itll probably run away when ya rev it

[carrizog60]

bring him over here lol

from you tube novies he seems a good attitude guy

now for the topic:

1 to extend the RPM range, 2 maintains gov function.

yes,but wont shimming the spring do the same thing?
In the same way  a choke cable might work as a cruise control.
pulling the choke will affect timing...
cani follow you there,if its the same why todo this?

I think this is carving the LDA housing deeper, but maybe just trimming the plastic snubber in there

i removed my plastic shim...but does the levers inside,even with the pin cut in a very agressive way,can reach full movement?
i checked with the top off the pump and the protusion of the pin moving the lever is not that much.my lda pin,the way it is can aloww full motion so i really dont  get this mod...
more travel = better resolution
what do you mean by resolution?english is not my mother language,sorry...

I can say my D24 has very good anti stall properties.  I can idle around in 2nd smoothly, although displacement is a factor as well.

yep,but no performance gains there...
An easier to drive car= a better performing driver, less fatigued, and more able to focus.
dont think that this is a concern for the use of the car,and even at stock springs the idle works very good...

The delivery valves must be a matched set may be part of it.   EDMing the pump element to be  normal rotation IMO is the serious mod

the pressure held in each  fuel pipe might not be the same after a DV has become worn or damaged.  you need a flow bench to see the difference.
The DV needle and seat must be good, and I think the spring can be shimmed

didnt understand this...
he shows on some youtube movies pumps not distributing fuel at an equal cc,what can be done to achieve that?

arent the DV just there to stop injection?if they can affect flow what is theyr max flow potential?any need to work on them with high flow fuel pumps?

i love to learn how to tune things,and for me bosch fuel pumps are a marvel!

[745 turbogreasel]

bring him over here lol

from you tube novies he seems a good attitude guy

now for the topic:

1 to extend the RPM range, 2 maintains gov function.

yes,but wont shimming the spring do the same thing?
In the same way  a choke cable might work as a cruise control.
pulling the choke will affect timing...
cani follow you there,if its the same why todo this?
Here I am refering more to the crudeness of a throttle position holder vs. a speed regulating device.  Gov mod  has the same relationship to this work, but we don't have the test bench machine, so we gov mod.

I think this is carving the LDA housing deeper, but maybe just trimming the plastic snubber in there

i removed my plastic shim...but does the levers inside,even with the pin cut in a very agressive way,can reach full movement?
i checked with the top off the pump and the protusion of the pin moving the lever is not that much.my lda pin,the way it is can alow full motion so i really dont  get this mod...
more travel = better resolution
what do you mean by resolution?english is not my mother language,sorry...
like a computer monitor, 640wide by 480tall, you can have 480 steps  of your LDA, make it 1024 by 768, now you have 768 steps.  He cold get max power without doing this, but part throttle driveability would suffer.  A bigger fuel map table in gasoline tuning terms.

I can say my D24 has very good anti stall properties.  I can idle around in 2nd smoothly, although displacement is a factor as well.

yep,but no performance gains there...
An easier to drive car= a better performing driver, less fatigued, and more able to focus.
dont think that this is a concern for the use of the car,and even at stock springs the idle works very good...
Perhaps it just was what came with the Volvo arm?

The delivery valves must be a matched set may be part of it.   EDMing the pump element to be  normal rotation IMO is the serious mod

the pressure held in each  fuel pipe might not be the same after a DV has become worn or damaged.  you need a flow bench to see the difference.
The DV needle and seat must be good, and I think the spring can be shimmed

didnt understand this...
he shows on some youtube movies pumps not distributing fuel at an equal cc,what can be done to achieve that?

arent the DV just there to stop injection?if they can affect flow what is theyr max flow potential?any need to work on them with high flow fuel pumps?

i love to learn how to tune things,and for me bosch fuel pumps are a marvel!

If one line rests at a lower pressure, injection  will start later, and not be as much quantity maybe?  In my opinion this is none of the big differences between a rebuild and a reseal. I don't think they need any change unless  you have gone to larger diameter fuel pipes.