Safe RPM - page 1 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

• Safe RPM by T-hane on 06 Dec, 2005 20:47
• In my car i have the a gear box code of AGS and i find the gear ratio to be great for driving in town.  But on the hi-way at 120km the car is at 3000rpm is that kind of rpm safe for long periods of time?
• #1 by QuickTD on 06 Dec, 2005 21:04
• 3000rpm is fine. I routinely cruise for hours at 3200rpm (135km/h) on the highway. My car now has 285000km on it, consumes no oil and starts instantly at -25ºC.
  
  VW industrial engines are often set up to run 3600rpm on 2 pole generators, they run at this speed under full load for years, not fun to listen to but it doesn't appear to harm them... I wouldn't sweat it.
• #2 by Black Smokin' Diesel on 07 Dec, 2005 03:28
• It's actually more harmful to an engine to leave it idling for hours than driving it on the highway. Unless you're scared that the timing belt won't survive or you have cooling problems, there's really no problem.
• #3 by T-hane on 07 Dec, 2005 17:21
• at that rpm what should i be seeing for fuel millage im  only gettng about 550 to a tank right now running 3000rpm on the hi-way.
• #4 by NOTORIOUS VR on 08 Dec, 2005 02:10
• Hmmm... I'd like to know as well.. I have the 4S tranny in my car (or so it says on the housing of the tranny), and @ 120 km/h i'm at 3200 rpm... which I thought is a little high...
  
  Anyone else here with a 4S tranny that can confirm?
• #5 by carrizog60 on 08 Dec, 2005 10:38
• i also have a 4S but at the moment the car is being rebuited and i never drive it before...
  120km/h at 3200 it´s kind high...
   :cry:
• #6 by Mark(The Miser)UK on 08 Dec, 2005 11:28
• Why not lift one front wheel and put it into 5th gear and check for one crank revolution whilst turning wheel...
• #7 by Dr. Diesel on 09 Dec, 2005 13:47
• i put the 3.67:1 ring and pinion in, and an .71 fifth gear. 2450 rpm at 100km/h.
• #8 by BlackTieTD on 09 Dec, 2005 14:10
• about time! we should go for another hwy drive now.  
• #9 by jtanguay on 09 Dec, 2005 14:55
• Wouldn't it be nice to have a 6 speed tranny?
  
  http://www.autoshoppingcenter.com/Volkswagen/transmissions_rearend/trans_6speed.html
  
  these would fit pretty much all mkII right? $$$$$$$$$$ though
  
  btw, I used to drive a 3 speed automatic golf gas...  3500 rpm at 100km/h very low mpg
• #10 by Maarten on 09 Dec, 2005 14:58
• Quote

  
  6-Speed Race transmission
  Race transmission for 4 Cylinder applications.
  Custom 1st through 6th gears
  limited slip differential installed

  
  
  I'll take this one, take away please  :roll:
• #11 by djteam on 10 Dec, 2005 00:31
• Hi,
  
  I took an Tranny of an 90HP TDI Engine, now i´m at about 150km/h@3200.
  
  It´s a cheap way to get RPM down.
  
  christian
• #12 by VWRacer on 10 Dec, 2005 09:38
• Just a note to those enchanted with the idea of a 6-sp manual trans...the only real advantage of 6 gears over 4 or 5 is in racing where more gears allows for better acceleration. For maximum economy the primary factors are the r&p ratio (lower number is better), the top gear ratio (lower number is better) and the drive-wheel diameter (higher number is better). Dr Diesel's solution above will yield the best fuel economy, no matter the allowed top speed.
• #13 by jtanguay on 11 Dec, 2005 12:18
• Quote from: "djteam"

  Hi,
  
  I took an Tranny of an 90HP TDI Engine, now i´m at about 150km/h@3200.
  
  It´s a cheap way to get RPM down.
  
  christian

  
  
  How much did that cost you?  Which TDI trans will fit a MKII IDI engine???  Sounds like it could be a simple swap
• #14 by NOTORIOUS VR on 12 Dec, 2005 01:49
• Any 4cyl VW tranny will fit another 4cyl VW engine... the only thing I could see that you'd have to change is the pedals for the newer hyrdo tranny.