1.6 IDI Timing Advance Mod.

[Black Smokin' Diesel]

black smokin diesel,

any change in your mileage? any more smoke?

Sorry about the late response :lol: Nope, absolutely no change in mileage and smoke.

[Black Smokin' Diesel]

so, after all that time as anyone tested this and measured the gains?
worth to do?
none/minimal risks?

The only real application I can see is if you can bore the cover to allow more advance in the higher RPM range. From what I've gathered, timing advance is lacking when you go over 5500rpm, so not much power is available

[carrizog60]

i am not planning rev that high,past 5500 but a faster advance would be good.
worth to do the schim removal trick?

[Cordoba1.9]

my english is not so good.. aaaaaand..
can someone post pics step by step for this procedure?
thanks in advance..

[Smkin85Turbo]

I tried to do this mod today and when I went dealer and they could not get the part. I went to a european auto parts place and they could not get the part. Does any one know where they could get the part online?

Is there any more consensus that this mod increase fuel mileage?

[rallydiesel]

Tapping the internal pressure adjustment pin into the body of the pump would be better if your pump is worn out. Or a better fix would be a new transfer rotor assembly.

[Smkin85Turbo]

Tapping the internal pressure adjustment pin into the body of the pump would be better if your pump is worn out. Or a better fix would be a new transfer rotor assembly.

Any more info on how to do this?

[Vincent Waldon]

Any more info on how to do this?

Yup... search for "internal pump pressure" here and www.vwdieselparts.com and you'll find tons.. how to measure, how to adjust, what to adjust to, why you need to adjust, etc...  great pictures as well.

[rabbitman]

Ok, I adjusted my pump pressure from 35psi to 43.5psi @1000rpm and it pinged too much so I retarded the timing. Smoke level went down, power is the same, or slightly more. I think my mileage went from 36 to 40? Still testing so I'll have more coming.

[zukgod1]

On some of our pumps we have the 12v solenoid that energizes @ a specified RPM or speed (anyone know what that is?) so if we were to energize it @ start up with key on power then do this mod would that be feasible?

Here's why I ask. I did this mod when I rebuild my pump, not ever driving the car before gives me no reference point. I have a rpm range when the IP delivers less fuel (or advance) and once past that point it hauls ass.
I dont have a tach so I cant give those #'s like I would like to do.
It pulls hard up to 20 psi then stays right there as the RPM's increase until what ever RPM it is when it takes off again and pulls up to 35 psi no problem. I let off as it reaches 30 psi new engine and all.

So I guess what I reachin for here is it feels like it advances up to a point then hold and advances more after a certain RPM is reached. I do not have my solenoid energized with keyed power and want to but I wanted to get some education before I did to see if I was heading down the correct path..?

[jimfoo]

On some of our pumps we have the 12v solenoid that energizes @ a specified RPM or speed (anyone know what that is?) so if we were to energize it @ start up with key on power then do this mod would that be feasible?

Here's why I ask. I did this mod when I rebuild my pump, not ever driving the car before gives me no reference point. I have a rpm range when the IP delivers less fuel (or advance) and once past that point it hauls ass.
I dont have a tach so I cant give those #'s like I would like to do.
It pulls hard up to 20 psi then stays right there as the RPM's increase until what ever RPM it is when it takes off again and pulls up to 35 psi no problem. I let off as it reaches 30 psi new engine and all.

So I guess what I reachin for here is it feels like it advances up to a point then hold and advances more after a certain RPM is reached. I do not have my solenoid energized with keyed power and want to but I wanted to get some education before I did to see if I was heading down the correct path..?

See the 3rd post down. http://vwdiesel.net/phpBB/viewtopic.php?t=12856

[zukgod1]

See the 3rd post down. http://vwdiesel.net/phpBB/viewtopic.php?t=12856

So it's a specific temp not a RPM?
And load sensing...?
So if energized at start up the advance will operate as it would in a pump without the ALFB, or the "load sensitive start of delivery with deactivation feature". maybe?

[jimfoo]

No temp, it depends on load. Just that once the engine warms up, it won't matter as far as HC. Generally, it is advised to just leave the terminal connected to power all the time.

So if energized at start up the advance will operate as it would in a pump without the ALFB, or the "load sensitive start of delivery with deactivation feature". maybe?

Yes.

[rabbitman]

Got some more numbers, I hooked a 1 gallon jug up for the fuel tank, it sits on the floor next to me so I can watch the fuel disappear, kinda depressing. :cry: Anyways, normal driving like 55-60mph uses 1 quart per 10 miles,(40mpg), I did one test going 45mph one direction 'till a quart was gone then I turned and went the way I came at 45mph 'till another quart was gone. Total for that test, 25.6 miles, works out to just over 50mpg.
Next I wanna see if going slow (less drag) caused the swell mileage or if it was the lower rpms. So I'll go 45mph in fourth gear instead of fifth and see what happens. 45mph in 5th is 1800rpms, in 4th it should be about 2200. BTW, this is a waste of fuel, :oops: but it's fun! :twisted:

[rabbitman]

Well, going 45 in 4th gear, 2320rpm, got me 'bout 10.5 miles per quart. That makes me think speed is not the main factor, but rpms :idea:  So I'm thinkin' lower rpms is the ticket, or a turbo would help mileage at higher rpm, maybe. Plus the extra HPs would be nice......

My next "trick" will be to put a weaker spring in the timing advance, I have red one layin' around, hopefully the one in the pump is a lot stronger than red, if not I'll just remove a shim.