Page 2 of 2 FirstFirst 12
Results 11 to 16 of 16

Thread: 300tdi auto gearing optiins

  1. 4th February 2019, 10:57 PM #11
    AK83
    AK83 is offline TopicToaster Supporter
    Join Date
    Apr 2016
    Location
    Melbourne
    Posts
    4,217
    Total Downloaded
    0
    245/75's on a std auto tdi, you should be getting something like what Verne calculated .. 2150-ish .. (give to take some).
    Actual tyres will make a slight difference of a few rpms at 100.

    I went from smaller 255/70's to 245/75's and revs bumped up a teeny smidge(maybe 50 rpms) .. I'm putting it down to the brand of tyres being slightly different.
    But at 100 now with the 245/75s, I get closer to 2200, than the 2150-ish with the 255/70s.

    top gear at 1750 should be right on lockup at ~80k/hr.

    Have you changed your alternator at any time? Can you see that it's been changed from what would be an old looking original.
    Alternator pulley size determines RPM at the tacho.

    So at 80k/hr, what RPMs are you getting?

    Another possible reason for such low readings at 100k/h could be slipping pulleys(either alternator or harmonic balancer)!!!

    Or as Manic said. . someone's fitted a 1:1 transfer case at some point.
    Arthur.

    '99 D1 300Tdi Auto
    '03 D2 Td5 Auto
    Reply With Quote Reply With Quote
  2. 5th February 2019, 10:29 AM #12
    Rick1970's Avatar
    Rick1970
    Rick1970 is offline Master Subscriber
    Join Date
    Apr 2011
    Location
    Dungowan
    Posts
    916
    Total Downloaded
    0
    Running a 1.4 tc in mine, 200tdi manual on 265/75’s. personally wouldn’t consider it on any smaller tyres (had 31x10.5’s for a bit). 33’s would work well with a 1.4 tc in a disco I think.
    '93 D1 V8 auto
    '93 D1 200Tdi 2-door, ARB's, MD transfer, sill tanks, winch, 2"lift.......
    '95 D1 V8 auto......gone
    '86 V8 RRC.....gone
    Reply With Quote Reply With Quote
  3. 5th February 2019, 11:05 AM #13
    manic's Avatar
    manic
    manic is offline Wizard
    Join Date
    Jan 2010
    Location
    Melbourne
    Posts
    1,801
    Total Downloaded
    0
    4th on the auto is a taller than 5th on an lt77

    Revs at 100kph:

    245/75 on zfauto+1.4tc = 2490

    265/75 on lt77manual+1.4tc = 2542
    Reply With Quote Reply With Quote
  4. 6th February 2019, 01:36 PM #14
    Fausto79's Avatar
    Fausto79
    Fausto79 is offline Wizard
    Join Date
    Nov 2012
    Location
    Kingsley, Perth
    Posts
    1,045
    Total Downloaded
    0
    FWIW i have standard gearing 5 speed manual tdi on 245/75 and my speedo reads ~2250rpm at 100kmh road speed (95kmh on speedo) in 5th gear. when i had std 235/70 it was more up around the 2500rpm mark.
    Reply With Quote Reply With Quote
  5. 10th February 2019, 02:55 AM #15
    mateusz
    mateusz is offline Master
    Join Date
    Feb 2009
    Posts
    143
    Total Downloaded
    0
    Seems like a have a 1.003 rrc transfer case. Ill have to grab the serial number as it prob be a roller bearing transfer case. Cruising is not bad when empty. After all which cars cruise at 1750 rpm. On the open high way its not bad. By changing to 4.37 cwp i would be sitting at around 2200rpm. Is it going to chem more fuel? Would you feel inprovement take off in high range? Better downhill braking offroad-inprovement for vhc?
    Reply With Quote Reply With Quote
  6. 10th February 2019, 09:54 AM #16
    Vern's Avatar
    Vern
    Vern is offline OldBushie
    Join Date
    May 2006
    Location
    Woolgoolga
    Posts
    7,870
    Total Downloaded
    0
    You would have much better low range if you leave the tcase and swap your diff gears
    Reply With Quote Reply With Quote
Page 2 of 2 FirstFirst 12
« Should I replace a badly leaking (oil) vacuum pump? | Oil leak inside front disk »

Tags for this Thread

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!