Author Topic: Does the Isuzu engine like revs?  (Read 563 times)

Online yerriyong

  • Newbie
  • *
  • Posts: 26
  • THANKS 3
  • Location: nsw sth coast
Re: Does the Isuzu engine like revs?
« Reply #15 on: September 28, 2018, 01:31:46 PM »
I would love the taller ratios on the bitumen, what diff centers are compatible with the 6x6 front diff.
97 6x6 arn 202 300
90 rfsv arn 51658

Offline 303Gunner

  • REMLR Inc
  • Veteran
  • *
  • Posts: 1067
  • THANKS 121
  • Location: Lithgow, NSW
  • REMLR No: 128
Re: Does the Isuzu engine like revs?
« Reply #16 on: September 28, 2018, 02:28:31 PM »
It's been covered before in a few different threads:

http://remlr.com/forum/index.php?topic=1260.msg12130#msg12130 , and

http://remlr.com/forum/index.php?topic=3607.msg35190#msg35190

Basically, you will need to change over the diff centres from those used with a 4.7 ring and pinion to ones with dimensions suited to 3.54 gears. And do all 3 diffs.

As a 6x6 owner, you're already splashing cash around like there's no tomorrow, and it's just as bad when considering lockers. You always have to spend more than a 4x4 owner.

Offline BEARMAN

  • Hero Member
  • *****
  • Posts: 570
  • THANKS 82
  • Location: Hay Point
  • REMLR No: 430
Re: Does the Isuzu engine like revs?
« Reply #17 on: October 01, 2018, 07:30:17 PM »
As said the majority of 6x6's already have the highest transfer ratio available (0.996) only the LRPV has a different one and is the same as the RFSV. Diff ratios available include 4.7, 4.11 and 3.54. I have opted to go the 3.54 as they were readily available to me and so far am pretty happy with them - only downside is I am getting slightly higher egt's and have to back off on some long steep climbs and am looking at intercooling to overcome this. I was considering going 4.11 but decided to go 3.54 and can then change the transfer gearing to the 1.123 RFSV/LRPV gearing if I want to but haven't decided to go this way as of yet. I do have some 4.11 gears for sale if anyone is looking for some including a MD reverse cut front one and 1 Salisbury one.
09/1998 Perentie 6X6 ARN202516 - BRUTUS

Online yerriyong

  • Newbie
  • *
  • Posts: 26
  • THANKS 3
  • Location: nsw sth coast
Re: Does the Isuzu engine like revs?
« Reply #18 on: October 26, 2018, 09:26:51 AM »
I am interested in what 3.54 diff center is compatible with the 6x6 front diff.
97 6x6 arn 202 300
90 rfsv arn 51658

Offline BEARMAN

  • Hero Member
  • *****
  • Posts: 570
  • THANKS 82
  • Location: Hay Point
  • REMLR No: 430
Re: Does the Isuzu engine like revs?
« Reply #19 on: October 26, 2018, 10:04:18 AM »
Any front rover type diff with fine splines. D1, RRC etc. Good time to fit an ATB like a trutrac or Ashcroft type.
09/1998 Perentie 6X6 ARN202516 - BRUTUS

Online yerriyong

  • Newbie
  • *
  • Posts: 26
  • THANKS 3
  • Location: nsw sth coast
Re: Does the Isuzu engine like revs?
« Reply #20 on: October 26, 2018, 10:31:17 AM »
Thanks, my understanding was that the rover diff was not as strong as the salisbury or the front 6x6 diff.
97 6x6 arn 202 300
90 rfsv arn 51658

Offline 303Gunner

  • REMLR Inc
  • Veteran
  • *
  • Posts: 1067
  • THANKS 121
  • Location: Lithgow, NSW
  • REMLR No: 128
Re: Does the Isuzu engine like revs?
« Reply #21 on: October 26, 2018, 12:38:48 PM »
The 6x6 front diff IS a "Rover" diff. The housing is cast instead of the fabricated design usually seen, and the centre has 4 pinions instead of the usual 2 pinion, but these are just "beef up" options for the Rover unit. In all other respects it is a Rover diff.

If you want to change the front diff ratio to 3.54 and keep it the same design as now, you will have to source a 4 pinion 3.54 centre from a 4x4 RFSV or Survey to get the right offset for the 3.54 gears (but a 2 pinion centre from a 4x4, or Disco, RRC, etc will fit too) . Failing that, any of the replacement centres for traction aids for a Rover diff will work, ie Ashcroft ATB or Air Locker, Detroit Truetrac, ARB Air Locker. 

Online yerriyong

  • Newbie
  • *
  • Posts: 26
  • THANKS 3
  • Location: nsw sth coast
Re: Does the Isuzu engine like revs?
« Reply #22 on: October 26, 2018, 01:19:39 PM »
Thanks for that information, I will ponder now if it is worth the hassle.
97 6x6 arn 202 300
90 rfsv arn 51658

Offline BEARMAN

  • Hero Member
  • *****
  • Posts: 570
  • THANKS 82
  • Location: Hay Point
  • REMLR No: 430
Re: Does the Isuzu engine like revs?
« Reply #23 on: October 26, 2018, 01:20:51 PM »
The 6x6 front diff IS a "Rover" diff. The housing is cast instead of the fabricated design usually seen, and the centre has 4 pinions instead of the usual 2 pinion, but these are just "beef up" options for the Rover unit. In all other respects it is a Rover diff.

If you want to change the front diff ratio to 3.54 and keep it the same design as now, you will have to source a 4 pinion 3.54 centre from a 4x4 RFSV or Survey to get the right offset for the 3.54 gears (but a 2 pinion centre from a 4x4, or Disco, RRC, etc will fit too) . Failing that, any of the replacement centres for traction aids for a Rover diff will work, ie Ashcroft ATB or Air Locker, Detroit Truetrac, ARB Air Locker.

What gunner said. The rear diff from a P38 is a 4 pinion fine spline which will also fit if you machine a bit off the crownwheel carrier where the crownwheel sits ( the lip is too wide)
09/1998 Perentie 6X6 ARN202516 - BRUTUS

Online yerriyong

  • Newbie
  • *
  • Posts: 26
  • THANKS 3
  • Location: nsw sth coast
Re: Does the Isuzu engine like revs?
« Reply #24 on: October 26, 2018, 02:24:51 PM »
thanks
97 6x6 arn 202 300
90 rfsv arn 51658