Pump Mods/Gov Mod? - page 2 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• #15 by jimfoo on 06 Jun, 2007 09:45
• I believe you should only shim the main spring. I did just the intermediate spring, and although I haven't driven it yet, I don't like the way that you give it a little pedal and the rpm's start creeping up, then all of a sudden go way up.
• #16 by Bean on 06 Jun, 2007 10:03
• Is that on an N/A engine?
  
  Can anybody else confirm this?
• #17 by jimfoo on 06 Jun, 2007 19:12
• It is on either engine. This is also what Named TinTin stated in another post, unfortunately after I did the intermediate mod.
• #18 by Bean on 07 Jun, 2007 01:20
• It can't be on either engine, because the gov mod guide for the turbo'd engines say to do both intermediate and main spring mods. And giles mentioned to only do one of the mods on the N/A engine. (If I understand correctly)
   :?:  :?:
  
  I just wanted to confirm if you were having these problems with an N/A or not.
  
  So, how much am I shimming the main spring by, if that's the right one to do?
• #19 by foxracer1 on 07 Jun, 2007 04:15
• The reason you should only do one spring on a NA is the fact that it has no turbo and can't use all of the fuel. It just over fuels because the lack of boost.
• #20 by jimfoo on 07 Jun, 2007 05:43
• Correct. And the reason Named TinTin states to not do it on the turbo is because it can cause driveability issues.