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Thread: rotating the diaphragm wheel

  1. 4th November 2013, 07:24 PM #1
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    rotating the diaphragm wheel

    So, I was reading about rotating the diaphragm wheel to get a bit more fuel.

    mine is a 97 300tdi auto with the boost upped to 18-20psi at the turbo (roughly 16-18psi at the manifold)

    I pulled out the diaphragm plunger and rotated it to the longest travel (ie "full fuel) and took it for run... it felt better, but not a huge increase and only tiny bit of greyish smoke.

    Then put it back to stock and took it for another run... again, I'm not if there was a difference!

    I need another opinion, so I got the mrs to come for a run. we timed 80-100 in 14.6 secs with the wheel in stock position. Then swap to the "full fuel" setting and did the same run on the same piece of road... 80-100 in 10.4 secs!

    So why isn't there a heap of black smoke at "full fuel"? is it because of the extra boost?

    I have an EGT on order to make sure I'm not running anything too hot, but with the lack of black smoke I doubt it's getting too hot unless I hold it at full throttle for a long period of time.
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  2. 4th November 2013, 07:44 PM #2
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    have a look here :
    TDI Fuel Pump Tweaking - with pictures
    cheers
    If you can't fix it with a hammer , you got an electrical problem .......
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  3. 4th November 2013, 07:55 PM #3
    rhlushak Guest
    I turned mine from the stock setting to the "steepest" and noticed a difference in HP, with only a tiny bit of black when she's floored. Any more is just a waste of fuel. Get rid of the middle silencer, and add a K&N air filter to the mix, you will hear the turbo spool up faster, definately feel the difference....
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  4. 4th November 2013, 08:03 PM #4
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    Quote Originally Posted by manchild21000 View Post
    have a look here :
    TDI Fuel Pump Tweaking - with pictures
    cheers
    Thanks, I'll have a read. I was using that PDF that's been floating around.

    Quote Originally Posted by rhlushak View Post
    I turned mine from the stock setting to the "steepest" and noticed a difference in HP, with only a tiny bit of black when she's floored. Any more is just a waste of fuel. Get rid of the middle silencer, and add a K&N air filter to the mix, you will hear the turbo spool up faster, definately feel the difference....
    I've already deleted the middle muffler, but I'm considering going to a 3". Still no K&N, but I'm thinking of using an early Disco round airbox, if I can find one.
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  5. 4th November 2013, 08:18 PM #5
    redrovertdi Guest
    I tried all the above myself, my diaphram was originally on the leanest side of the cam so turning that made a huge difference but in the end paying a pro to tune the injector pump was the best money i spent and the only times my car has gone to a shop[MR auto], mine was tuned when i fitted a full front intercooler and then again after i fitted an mtq water cooled turbo and 3 inch exhaust. I built my engine[300tdi] and converted it to auto[110] on the driveway at home but when it comes to tuning that pump it was well worth paying an expert
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  6. 4th November 2013, 09:20 PM #6
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    Quote Originally Posted by redrovertdi View Post
    I tried all the above myself, my diaphram was originally on the leanest side of the cam so turning that made a huge difference but in the end paying a pro to tune the injector pump was the best money i spent and the only times my car has gone to a shop[MR auto], mine was tuned when i fitted a full front intercooler and then again after i fitted an mtq water cooled turbo and 3 inch exhaust. I built my engine[300tdi] and converted it to auto[110] on the driveway at home but when it comes to tuning that pump it was well worth paying an expert
    I did notice that mine was not on the leanest setting. Being an auto, I expected it would have been turned up slightly from stock.

    I will go to a full front mount intercooler and 3" exhaust, then I might consider getting a pro to tune it.

    Who does good diesel tuning in Vic?
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  7. 4th November 2013, 09:55 PM #7
    redrovertdi Guest
    full front intercooler will make no difference at all until the pump is tuned to suit, same with the 3 inch pipe,
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