Thread: Database on Isuzu engine/Landrover gearbox combos

Looks like I get to start.

Vehicle: 85 Rangerover. 2300kg empty
Engine is a factory 4BD1T, ran 220,000km at mostly stock power levels, last 8,000km at +50% torque.
Boost is 20psi, no intercooler (yet) and fueled enough to hit 750C EGT's when asked.
Gearbox for the first 220,000km was Isuzu MSA-5P from an Isuzu NPR. Bearings feel rough when turned by hand due to running without oil. Not noticable while driving.
8,000km ago an MSA-5G gearbox was installed to get more suitable ratios, this gearbox is secondhand with approx 250,000km use. Still tight, smooth and quiet.

The MSA-5P was run with a 1.2:1 ratio LT230, this was swapped for a 1:1.003 ratio LT230 shortly before the MSA-5G gearbox was installed.
Dropping the cruising rpm from 2500 to 2000rpm made a huge difference in noise and comfort. Fuel economy improved too.

No failures, but they get loud when out of oil.

Thanks for getting this going Chris!


Vehicle and weight: County 110, 1987, 1.9T (as usually driven)
Engine: 4BD1 (currently na, but not for much longer)
Gearbox: Factory LT85
Kms without problems: 240 000 (rebuild) / 100 000 (since rebuild)
Failure: Failure (loss of drive) at 240k km. PO sent box to MD for rebuild. Believe the problem was stripped mainshaft splines. New mainshaft, 5th gear, and many new internals fitted.
Transfer case ratio 1.003:1

Can I suggest we each post our own vehicle (rather than a mate's we don't have complete info for). Though I will try and call the mate of mine who has killed 6 or 7 R380's - to get full info - as he doesn't do forums.

Veh - Defender 90
Weight - Hard to say.........
Engine -4BD1, was a N/A but have converted to non-gated garrett
Tweaks - Manderal custom 3" exhaust
Tweaks to come - T25 turbo, custom intercooler, custom grind cam
Gearbox - R380, suffix "J" 7k old now
Km's / Probs -snapped the original mainshaft at 3k, I personaly think it
was an existing problem with the old shaft an the suzi found it!

Nature of G/box work - I built the car for it's towing capasity, in the top end I need to be able to tow a big boat all day and then launch it. The Isuzu was the only choice. I originaly had the LT95, just got sick of the ratios!!! I could take off with a boat in second. Needless to say I tow in fith..............

Transfer case - I now have a LT230 with the 1:1 ratios, cruise on 100 @ 2000rpm.

Fuel econ - I get around the 10Lt/100km, although lately a bit better @ around 9lt/100km

My turn...

1992 RRC, 520,000km old N/A 4BD1 ex 1988 110 county. Now turboed and intercooled, air to air front mounted. Using Garret TB25 watercooled unit on centre mount exhaust manifold. Broken 3 ZF 4HP22's, fitted a LT95, transfer case thrust washers wore out 3 times in 20K, now fittted ex perentie 6X6 LT 95 with all the taper roller conversion etc. Now not concerned abou the transmission at all All this with the fuel wound up to give me 640deg up hills in 4th converter lockup. No wonder the lock up clutch material was stripped off it...

I am now running conservative fuelling due to fuel $$$, up a long hill towing a 1000kg camper trailer in top gear I can exceed 520deg JUST. Without a load, I run out of hill before it gets that high. I can easily pull up hills in top gear with 33" tyres all day, and will easily see the fuel governor in 4th on the flat or any light gradient. My fuel consumption is in the region of 11 to 14 litres / 100km, and I have 15psi at the manifold max boost, wastegate disconnected.

I only have 1 weakpoint now. The clutch. Not slipping yet, but I can see myself upgrading to the 6X6 spec pressure plate soon.

I haven't dynoed the thing yet, but as I drive plenty of chipped Defenders and Disco Td5's, I would say mine is at least 20% more torquier and must be in the region of 450 to 500Nm. Especially due to the fact I am also on average 2" taller in tyres....

JC

Now for my vehicle:

Vehicle: 99 Defender ex 300 Tdi 3.1 tonnes loaded for a trip
Engine: Factory 4BD1T running 12 psi boost with small increase in fuelling
Gearbox: Late suffix large layshaft bearing R380
Circa 21000 kms with no problems
Trannsfer Case Ratio: 1.2:1

Have towed up to about 2.8 tonnes without any difficulties - easily cruising at highway speeds.

Fuel consumption between 11.9lts/100ks (8.4kms/lt 23.68mpg) and 15.7lts/100ks (6.38 Kms/lt 18mpg) towing average about 19mpg (6.74kms/lt 14.8lts/100ks)

Christopher

Vehicle 85 Range Rover 510hours both engine and box

Engine
Isuzu 4BD1 with factory turbo rebuild kit, TD5 turbo custom manifold 2 1/2'' straight thru exhaust. Top mount I/Cooler with ''Mad max'' style bonnet scoop, running 15psi boost at manifold, refuelled pulling 600 deg full load up hill.

G/box & Trans
Suffix J R380 running through LT230 1.22.1 high range, Maxidrive 57:1 low range

Diffs
4:11 spanish reverse helix running on 35'' Creepys Maxidrive shafts and lockers + CV anti exploder rings

Weight
2440kg unladin

No problems on road other than the spigot bearing is getting worn I think.
Off road have twisted a couple of rear tailshafts, destroyed 1 rear CWP. Sheared 1 front outer shaft.

Cruises happily on 100km/h at about 2000 - 2100
Torque is unknown but has ample supplies of it. Towing is no problem, but I am very gentle on the gearbox. Fuel economy unknown but is fairly good for the vehicles performance.

Justin

88 110 4BD1 (post factory Turboed, 2 owners ago) with taper roller bearing conversion to the original LT85
35*12.5's cooper STT's
4.11's front and rear

approx 320k on the drive train - nothing broken since I got it...

not sure what the clutch is as I haven't had it apart since purchase

Plans: I/C, and use the blardy thing a lot more than currently!!

you want the military stuff I get to see fubared or just pers stuff?