Pump Mods/Gov Mod? - page 1 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Pump Mods/Gov Mod? by foxracer1 on 16 Nov, 2006 14:28
• So i did the Gov mod. I used a piece of 1/4" stainless tube to eliminate the intermediate spring and to preload the main spring 1/4". Now it idles fine crusies fine. But when i mat it the it doesn't pull as hard as say 85% throttle. I feel it is over fueling way to much cuz i'll get what looks like white smoke. I backed the full load fuel off but it just took away from the first 50% of the throttle then it was the same as before throught the rest of the travel.
  
  The EGTs never went above 1100 but was around 700 just cruising at 45mph. I installed a SCed Corrado manifold with a modified dual downpipe. I put my probe in the port on the manifold that is in between the two ports. What are the usual temps to expect out of the egts?
  
  I haven't had much road testing so next week when i do more i'll post more but if anyone has delt with the similar please let me know.
• #1 by foxracer1 on 20 Nov, 2006 11:28
• anyone???
• #2 by AdAm84 on 21 Nov, 2006 17:17
• white smoke isn't good.
• #3 by Giles@PerformanceDiesel on 23 Nov, 2006 19:06
• hi
  u didn't mentionif it's a turbo or not?
  
  if u have the non turbo then don't do the gov mod
  
  Giles
• #4 by foxracer1 on 23 Nov, 2006 20:39
• Yup its a non turbo. Whats the problem with doing it to a N/A?  I have a Pyro, and all its doing is continuing to add fuel until the higher rpms. If there is more to know please let me know. I redid it with a shorter piece and it seems to run good really strong in the low to mid rpm, combined with the corrado manifold and downpipe. I just need to work on the intake.
• #5 by Hillshy on 26 Nov, 2006 04:08
• Hi all,
  
  i'd also like to know why the Gov mod shouldn't be done on a N/A motor?
  
  
  Hillshy
• #6 by Giles@PerformanceDiesel on 26 Nov, 2006 06:36
• u shouldn't do the part load gov mod since it changes the fuel
  delivery the wrong way for a NA engine.
  
  but do the max rpm gov mod though
  
  Giles
• #7 by Benjamin on 26 Nov, 2006 09:04
• Quote

  u shouldn't do the part load gov mod since it changes the fuel
  delivery the wrong way for a NA engine.
  
  but do the max rpm gov mod though
  
  Giles

  
  
  so, only a stronger preload for the main spring, and not shimming the intermediate spring?!?
  
  Greetz, Benjamin
• #8 by foxracer1 on 14 Dec, 2006 13:31
• Quote from: Giles@superiorFuelInj

  u shouldn't do the part load gov mod since it changes the fuel
  delivery the wrong way for a NA engine.
  
  but do the max rpm gov mod though
  
  Giles

  
  
  That would make sense on the way the ole N/A is runnin. gonna switch it out this weekend. So the max rpm spring is the longer one?
• #9 by hipifreq on 14 Dec, 2006 15:24
• Quote

  Sounds like your timing is retarded.
  
  Andrew

  
  
  *COUGH*
  
  Don't you mean "your timing has an intellectual disability?"
  
   :wink:
• #10 by dover on 18 Dec, 2006 17:04
• Quote from: Giles@superiorFuelInj

  u shouldn't do the part load gov mod since it changes the fuel
  delivery the wrong way for a NA engine.
  
  but do the max rpm gov mod though
  
  Giles

  
  
  OK... I'm a newb with an '85 Golf NA (with 1 leaking pump installed and several old "spares")
  BUT: I have a seal kit  (local Bosh service center), the Bosch IP pdf (open... can't re-find the link), the "Governor Mod" and the "Governor Mod - Clarified" open and
  
  I'm a little confused. The first one looks like a TD IP (I got no diaphragm on mine). Am I going for the second one?
  Just the intermediate spring or just the shims on the big spring?
  
  Is this the figure I need to fully grasp:
  
  
  I don't want to race but I hate it when they show up in the rear view on long climbs.
  
  If I do manage to up the power will methanol/water injection make any difference in an N/A?
• #11 by rabbitman on 19 Dec, 2006 00:31
• what is the dif between a part load gov mod and a max rpm gov mod? or did I miss a simple thing? :?
• #12 by Bean on 25 May, 2007 04:28
• Anybody cleared this up yet?
  Does giles mean that you should only pre-load the main spring and leave the intermediate in tact for a N/A diesel?
• #13 by Baxter on 25 May, 2007 11:58
• I tried this.
  
  I have a NA caddy, I did both mods, it was okay, but as stated it didn't feel as quick when booted.
  
  So, I undid one of the mods and it worked a teat.
  
  Caddy now pulls harder all the way up the rev range.
• #14 by Bean on 06 Jun, 2007 09:03
• Which mod did you undo? Shimming/replacing the intermediate spring, or shimming the main spring?
  
  My pump is leaking and I think the O ring is probably shot, so I want to do this when I replace that but I need to be sure which mod to do before I pull things apart.
  
  Cheers   :wink: