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I'd think somewhere between 2000-2500rpm at 100km would be good for a 6x6. You will need a better turbo than factory (especially if factory was no turbo) to give you more low down boost and torque.
As Brian said, the gear split and making sure you have a suitable gear for each forseeable occasion is the most important thing.
Bloody Microsoft re-booted my machine overnight and excel didn't autorecover the spreadsheet, now I have to do it again! :mad: :mad: :mad:
At least I have the image files.
Here's a spreadsheet I made some time back.
Change the orange cells and it should fill out the rpm's for you.
There are three tables to compare the LT95, LT85 and Isuzu/LT230 combo.
I think I got the ratios from ashcroft.
My gearing calculator is in the spreadsheets thread - in zip format.
It has a summary sheet that compares many options using the popular/useful combinations of gearboxes and transfer cases for the 4BD1/T, which are on individual sheets.
Thanks guys.
In following up on Ben's comments about the Q box, I wend to Graeme Cooper's on the way to work. They looked up one of their training manuals which specifies the Discovery 1 had 28D (? LT230T)So perhaps I'll be lucky. :(
- suffix up to "F" 1.222:1 26 tooth input gear.
- suffix "F" 1.214:1 28 tooth input gear.
- suffix "G" 1.211:1 38 tooth input gear.
Quote:
Originally Posted by Lotz-A-Landies
I can't see how that could be correct and it conflicts with Ashcroft's info.
38 tooth input gear should be the Q case. You cannot make a 38-tooth input gear with T-size teeth.
My broken Q case posted above was a 36D from a late model Disco 1.
The case I replaced it with was a 28D 1.222
If you already have a t-case, just pull the pan off and you can see instantly if it is a Q-case or not.Quote:
28D = 1.222
29D = 1.192
32D = 1.222
36D = 1.211
38D = 1.211
40D = 1.211
41D= 1.211
43D = 1.410
47D = 1.667
57D = 1.410
59D = 1.211
61D = 1.211
62D = 1.211
68D = 1.211
69D = 1.211
70D = 1.211
Q gears are on the right of the equivalent gears in a T transfer case in this pic.
https://www.aulro.com/afvb/
Hi Ben
Only suggesting that is the information sheet from Jaguar Rover Australia's training manual. It also talks about the currrent Defender at that time being a 22D.
The text states: " ... In its original form it was designated as LT230R. With the replacement of the radial intermediate bearings with tapered roller bearings the designation was changed to LT230T. This specification is still being ustilised in present versions of Discovery and Defender and also for Pre-3.9 litre Range Rovers. ... This makes the information early 1990's and not necessarily contradictory to Ashcroft's or your information on later boxes or the ones in the 3.9 litre RRc.
It is possible the LT230 I have will be one of the earlier 1.222 or 1.214 boxes, but I'm still not convinced (given the 3.9 and R380 in the D1).
Is your case a 28D or 36D prefix?Quote:
Originally Posted by Lotz-A-Landies
Don't know yet, it is located at Leppington 40 Km from home and 50 from work.Quote:
Originally Posted by isuzurover
I can only get out there on weekends.
JohnQuote:
Originally Posted by Bush65
Do the Speed/RPM graphs update when you change the data? Not seeing it happen.
Diana