Author Topic: 1.6 IDI Timing Advance Mod. (Read 52298 times)

DVST8R · « **on:** April 19, 2007, 01:17:54 am »

Now let me preface this by saying that this is not my work, it was lifted off the voertex and was posted by: TurboDieselTech So give the credit there. Here is a link to the post http://forums.vwvortex.com/zerothread?id=3190912

but this is what it says incase the link goes bad:

Quicker acceleration and better mileage... Change the injection timing advance curve...

This CAN be done on the car without removing the injection pump. On the side of the pump facing the front of the car, there's a round plate with two screws. This is where the advance mechanism lives. Before you begin, go to the dealer and get the seal kit for the advance piston housing. It'll consist of two large green o-rings, several smaller ones and an e-clip. Cost is about $5.

Loosen the cover, using a T30 Torx bit. Now you are going to remove the screws and cover. Be careful as there is a rather large spring behind the cover, as well as some spacer shims. Once the cover is off, you should find two shims between the spring and cover, and if you remove the spring, there will be one more shim. Take all of them out and look at them. Take the thickest one and set it aside... you won't be needing it. Now, smear some vaseline on both ends of the spring and stick a thin shim to each end. Insert the spring back in and put the cover back on, using a new o-ring. You must have a shim on each side of the spring, otherwise the spring will "machine" the aluminum cover and advance piston, filling your pump with fine metal filings... thus destroying the pump and injectors. Take a ride and feel the throttle response!

For those of you that have access to parts for these pumps (new or used), you can get even better throttle response and power by changing the advance spring too... Just replace the spring currently in your pump with a "lime green" colored spring. This spring has the softest spring rate and allows the pump to advance the timing MUCH sooner, with more overall advance. These springs are commonly found in early rabbits (pre 80) and Vanagon diesel pumps. Color codes from softest spring rate to hardest is as follows... Green, Red, yellow, silver, and blue. The hardest spring rates will give the LEAST timing advance.

malone · « **Reply #1 on:** April 19, 2007, 10:35:53 am »

Kick ass!

foxracer1 · « **Reply #2 on:** April 19, 2007, 05:24:03 pm »

I'm in the market for a green spring if any one has one!
haha

Thats some good info nice work.

foxracer1 · « **Reply #3 on:** April 19, 2007, 05:48:21 pm »

I just looked at the pump i have apart and it GREEN! So now i must go tear the one on the car apart.

Did we ever figure out if machineing the cover out would benefit any? I believe fspgtd had a thread about it a while back.

MaxHedrm · « **Reply #4 on:** April 19, 2007, 07:52:46 pm »

If removing a shim does, I would assume that machining the cover would have the same effect.

foxracer1 · « **Reply #5 on:** April 19, 2007, 09:57:18 pm »

fspgtd was talking about machining the cover where the piston would bottom out. Not where the spring rides. He was trying to achieve more overall advance not earlier advance.

But i will try this green spring removew a shim mod this weekend

nkb · « **Reply #6 on:** April 20, 2007, 04:19:01 am »

this work with 1.9s too right? i mean it should??? im a lucky guy with a blue spring

AdAm84 · « **Reply #7 on:** April 20, 2007, 09:09:53 am »

Nice! I think i might try this one. Sounds a little more simple than the governer mod.

Laurentian · « **Reply #8 on:** April 29, 2007, 03:11:53 pm »

So if I understood correctly this is for a 1.6D and not 1.6TD?
I just looked at my 1.6D pump and it does have the cover
with the two torx screws.
Let me know!
Thanks!!
Hugh

DVST8R · « **Reply #9 on:** April 29, 2007, 04:09:48 pm »

Quote from: "Laurentian"

So if I understood correctly this is for a 1.6D and not 1.6TD?

1.5D, 1.6D, 1.6TD, 1.7D, 1.7TD, 1.9D, 1.9TD, 2.4D, 2.4TD, and probably even the early cummins VE pumps. :wink:

Benjamin · « **Reply #10 on:** April 29, 2007, 04:53:33 pm »

i think this only can be done good with the right IP internal pressure!
though i cant say much about it becouse my knowledge and english is not good enough for it.
anyway, i think its not so simple to have the best timing set up without a dyno and monitoring

Greetz, Benjamin

jtanguay · « **Reply #11 on:** April 29, 2007, 05:13:21 pm »

does anyone have a source for these green springs?

jimfoo · « **Reply #12 on:** April 29, 2007, 08:52:58 pm »

Of course, if you do those mods, do you still want to change the initial advance, or will that advance your timing too much, and how do you know?

84Q · « **Reply #13 on:** May 12, 2007, 06:18:29 pm »

i just went out and did the mod (on my '84 quantum), and the car is now slower. so....? it has the silver spring, but shouldn't removing the largest washer still have had a positive effect? nothing ever seems to go smoothly with this car...but i love it nonetheless.

saurkraut · « **Reply #14 on:** May 14, 2007, 08:33:12 am »

There seems to be a general consensus that more advance is always good. When I temporarly used non-TD injectors (which essentially gave me more advance) in my 1.6TD, I noticed a decrease in top end power too.

So by doing this spring mod, you might be putting yourself out in the long grass and actually decrease your HP.

Author Topic: 1.6 IDI Timing Advance Mod. (Read 52298 times)

AdAm84

Laurentian

84Q