VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: Brian Rages on December 08, 2007, 07:30:01 pm
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Hi,
I'm doing a re-seal on my injection pump and thought it would be a good time to do a little hot-rodding.
I've read a lot on the "governor mod", but it seems like the method outlined in the FAQ is not the correct method for the N/A.
For the N/A, I want to shim the main spring? Is this right?
Has anyone done this mod with good results? Thanks!
In other news, I just ordered a GERMAN timing belt and tensioner...
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main spring for the n/a worked good on my 1.9 n/a it was very close to 90hp + a few other tweeks 8)
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Yeah shim the main, I mod alot of the NA pumps because they are so damn slow :lol:
I shim them about .055".
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the following process is the correct procedure for gov mod in NA pumps?
http://forums.vwvortex.com/zerothread?id=3107325 (http://forums.vwvortex.com/zerothread?id=3107325)
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giles has commented on this forum about the na pump before maybe i can find it
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this is what i have found for you... because i am so awesome (http://www.vwdiesel.net/forum/index.php?topic=2928.msg24712#msg24712)
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Jimfoo told me NOT to shim/remove the intermediate spring. He put a solid piece in there and it hurt drivability. I shimmed the Main spring about 1/4" or .250.... Maybe closer to .3" Anyway, I had perfect results and wouldn't do it any other way. You try and let us know.
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There's absolutely no reason to shim the intermediate spring - it's total movement is like 2mm, you can easily overcome it with the throttle. What it does is make the engine a whole heck of a lot more driveable. People mistakenly think they're gaining something by shimming it since it seems like it can reduce fueling, but it's such a small amount just pressing the pedal down further takes care of that and then some.
The big long main spring is all you need to mess with.
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Jimfoo told me NOT to shim/remove the intermediate spring. He put a solid piece in there and it hurt drivability. I shimmed the Main spring about 1/4" or .250.... Maybe closer to .3" Anyway, I had perfect results and wouldn't do it any other way. You try and let us know.
i used 2 1/8 inch thick stainless nuts. fit perfect over the shaft. worked like a dream. and like him ^, i too wouldnt do it any other way, not with how good it works doing this.
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this is what i have found for you... because i am so awesome (http://www.vwdiesel.net/forum/index.php?topic=2928.msg24712#msg24712)
;D
Clown...
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this is what i have found for you... because i am so awesome (http://www.vwdiesel.net/forum/index.php?topic=2928.msg24712#msg24712)
thks ;D ;) you're so awesome :P :P
Jimfoo told me NOT to shim/remove the intermediate spring. He put a solid piece in there and it hurt drivability. I shimmed the Main spring about 1/4" or .250.... Maybe closer to .3" Anyway, I had perfect results and wouldn't do it any other way. You try and let us know.
I don't know what's mean "hurt drivability". Could u help me? thks
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I believe that it is turning the pump into a on/off switch. Or at least there will be a varying dead spot in your pedal. It has been awhile but I think that is what Jimfoo said to me. I just know putting probably .300" of shim in the main spring made it go like a scalded goose with no problems otherwise.
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I just remembered!
The spot in the middle was bad because he couldn't keep a steady speed. That was the biggest concern with the intermediate spring shim.
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I believe that it is turning the pump into a on/off switch. Or at least there will be a varying dead spot in your pedal. It has been awhile but I think that is what Jimfoo said to me. I just know putting probably .300" of shim in the main spring made it go like a scalded goose with no problems otherwise.
I just remembered!
The spot in the middle was bad because he couldn't keep a steady speed. That was the biggest concern with the intermediate spring shim.
thks man ;)
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There's absolutely no reason to shim the intermediate spring - it's total movement is like 2mm, you can easily overcome it with the throttle. What it does is make the engine a whole heck of a lot more driveable. People mistakenly think they're gaining something by shimming it since it seems like it can reduce fueling, but it's such a small amount just pressing the pedal down further takes care of that and then some.
The big long main spring is all you need to mess with.
thanks
I will shim the main spring. 1 more question: for 1/4mile in NA diesel cathegory the better is shim the intermediate spring and the main or only the main?
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NA or TD, don't shim the intermediate spring. It isn't going to gain you anything other than a car that's a PITA to drive. The main spring is the RPM limit.
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you only want to shim the main spring. period. end of story. never shim the intermediate. it makes your throttle hang and makes it hard to hold a steady rpm cruising down the road.
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thanks for all :)