Thread: 300TDI boost pin upgrade

Interesting. This looks exactly what my 300 VNT needs. I'm willing to give one a wizz and report back

you dont need it

Just an observation, but wouldnt this give you LESS fine tuning capacity as its basically a one off setting, as opposed to the conical whereby you can turn it to fine tune fueling, or am i missing something?

Also why the reference to the starwheel? This is another setting that is independent of the pin taper...

Again just my thoughts, im not a pump expert

Found this on another forum .....
"The stock pin at its most aggressive setting adds fuel with no boost. In other words the pin is partially out at the no boost position. This one does not. If you have the correct maximum fuel set at full boost, especially at elevated boost levels, the fuelling off boost is too high and you will get smoke off boost. With the wider range pin, you can run more or less smoke free off boost with optimal maximum fueling at peak boost above stock values"

...hence why you drop the star wheel - I did all the 4 mods (stop screw, diaphragm, startwheel and main fuel screw) and now I hardly get any smoke (except for starts) and got power. By droppping the star wheel you lean out the offboost mix... again just my experimentation

Originally Posted by Discomark

Found this on another forum .....
"The stock pin at its most aggressive setting adds fuel with no boost. In other words the pin is partially out at the no boost position. This one does not. If you have the correct maximum fuel set at full boost, especially at elevated boost levels, the fuelling off boost is too high and you will get smoke off boost. With the wider range pin, you can run more or less smoke free off boost with optimal maximum fueling at peak boost above stock values"

Then whoever was doing that should not be allowed near the injector pump other than removing the lines for maintenance of other parts. Even then I have my doubts.

From memory There's 7 adjustments you can get to without dismantling the pump, 3 more you have to measure and shim inside and a handful of different springs you can fit.

That pin removes the ability to adjust the way the compensator "shapes" the fuel delivery as boost increases, leaving you with only the start point which is how much fuel you get at no boost and the spring pressure which sets how agressively the fuel rate ramps up.

I'd hope that the image of the one on the site is an unfinished or returned defected one, if you can see machining marks at internet resolution it's probably not something you want to fit in a precision environment like a fuel injector pump controller.