VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: shakakan on October 05, 2004, 05:01:44 pm
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Hey guys, I am an experienced mechanic, but never tuned anything that doesn't use an ignition coil(except for tractors). My question is What would be the most effective, cost and otherwise, way of improving a 1.6 NA without forced induction? Could someone please point me to a step-by-step how-to for injection pump adjustments, govenor mods, etc.
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do a search on Superior Fuel Inection. :D
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Check out my post at http://vwdiesel.net/phpBB/viewtopic.php?t=490#3369.
There is a link there for a timing procedure that helps a bit. I wish I had a picture of the back of the pump to show the full load fueling adjustment, but I don't. That's a simple screwdriver adjustment on the outside of the pump.
Governor mods and timing advance mods involve opening the pump and making internal modifications. This is not recommended for a beginner (though everyone who does it had to do it a first time).
The other suggestions in my post on that other thread are all fairly simple as well. They won't make the thing as powerful as a turbodiesel, but they will make the car less slow and more fun to drive.
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I am not scared of taking the pump apart. I'm sure I could get it back together right, just don't know what I need to change to make it more powerfull.
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I am not scared of taking the pump apart. I'm sure I could get it back together right, just don't know what I need to change to make it more powerfull.
Well, personally I recommend changing the full load fueling and the injection timing first. Those mods are pretty simple and will give you a feel for what you are working with.
If you want to rebuild the pump or moidify the internals, go for it. The mods inside the pump are more involved. There's a couple of books about the Bosch diesel injection pumps and I would highly recommend finding one and reading it thoroughly before you dive into rebuilding or modifying one of these pumps.
I think there's a thread on this site somewhere about doing the governor mod. And I think modifying the timing advance curves is somewhat similar to recurving a distributor for a gasser. But I've never actually taken a Bosch pump apart and done the internal mods myself, so I don't know much about how to do those mods.