I modded the fuel injection on my 1986 1.6 IDI VW diesel - pretty easy to do - just advanced the timing, modified the Fuel injection governor so that it no longer limits the fuel over 3000 RPM, installed new, more precise Bosio fuel injectors- Also wrapped electrical heating element around injection lines- preheats fuel to abt 180F -hot fuel atomizes better, runs better esp when engine is warming up. Also inflated the tires to max sidewall PSI, dropped the suspension by 1 1/2 inches w some GTI springs and Bilstein shocks to improve handling and reduce air resistance over 55mph. Bumped my MPG from 44 to 60. (at a steady60MPH), bumped my top speed from 82 to 107MPH, improved my acceleration-still not quick, but at least I can keep up with traffic now.
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