SOI tuning for VP37 pump and bigger nozzles

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SOI tuning for VP37 pump and bigger nozzles

Postby arwolc » Thu May 23, 2019 9:59 pm

Hello. I have Audi with AFN 1.9TDI. Some time ago was remaped for 0,21 injectors and VNT17 turbo. Car was fine. Now I change 0,24 nozzles and 1,6bar boost, but car is now slower than before. I changed the pump voltage map a little(low mg - higher voltage and opposite), with this I get lower EGT, but performance is worse than before with 0,21 injectors. I think, there is need to be changed SOI.
My 0,24 injectors is set to 210bar. Could someone help with SOI explanation a little bit?

Audi B4 1.9TDI AFN, 11mm, 0.24mm, VNT17, FMIC S3, Front brakes Girling 60, poly bushings
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Re: SOI tuning for VP37 pump and bigger nozzles

Postby paquillo » Thu Jul 11, 2019 12:33 am

Hello friend, to see if I can help you. Have you tried first to adjust the fuel transfer pump mechanically ?. This serves to give more flow mechanically to the pump by moving its body. Here I leave a YouTube link.

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