4bd1t fuel economy

[chire]

what fuel economy can you expect from a 4bdit and where would i look for conversion parts for a 5 speed 85 Rangie ???

[def90]

i think i get around 14/14.5L / 100km but my fuel is up a bit high, & run 14Psi, and sometimes i have a heavy foot on road, i think depending on set up they should be around 12L/100km

[Bush65]

An 85 rangie would have an LT77, which is far too weak to use behind a 4BD1.

Even the LT85's don't stand up the 4BD1 unless modified.

[def90]

i let you know how long a LT 77 lasts behind a 4BD1T, only a weekend warrior though....

got a bit more torque now then the original 200tdi...

[def90]

LT95 is the go isn't it?...

[Maggot4x4]

Non Turbo 4DB1 and I regulary see better than 9L/100km

[cloughy]

An 85 rangie would have an LT77, which is far too weak to use behind a 4BD1.

Even the LT85's don't stand up the 4BD1 unless modified.

Got one behind a 6.2 chev diesel thats done 100k since new bearings and synchro's and its fine, N/A but still??

[ISUZUROVER]

An 85 rangie would have an LT77, which is far too weak to use behind a 4BD1.

Even the LT85's don't stand up the 4BD1 unless modified.

I disagree John, IME they seem to hold up reasonably well, the one in my truck lasted 300000km before needing a rebuild (done by Mal Story at po's expense), and the one in a mate's 110 outlasted the engine!!! (but admittedly the engine died prematurely at about 300k km). This gearbox is still going strong, (50k km after engine rebuild) only problem is some play in 3rd.

Back on to fuel consumption, my 4BD1 uses 9-11L/100km, depending on how hard I am puhing it on the highway.

[1103.9TD]

12-13ltrs/100 without trying, could do better without an AUW of 3500kg, run up to 12.8 PSI in a 110 County LT85, with a standard Isuzu NA 2.25in exhaust - soon to be 3in Mandrel side exit. Cheers... Gerry.

[def90]

gerry let us know how the 3" goes and sounds when you get it done, cheers...

[1103.9TD]

Already sounds a bit like a racing truck, 'cause I removed all mufflers on the standard exhaust, but I reckon it'll go really well, especially having the outlet just tucked up in front of the left rear wheel/tyre.
Tweaking the fuel pump begins in two weeks time, when I get back to FNQ. I expect the consuption to go up in a big way. Cheers...

[justinC]

I'm getting 19 mpg towing a 1.2 ton poptop van at highway speeds. uphill and into headwinds, it seems to stay the same.
Without the van, about 24 mpg driven sensibly.(My wife says I can't drive sensibly...)

If I wound the fuel back I would be getting about 28 mpg, but it wouldn't be as much fun...

BTW, I'm on holidays and the RR is still at home waiting for its Allison auto conversion.

LS400 is nice to drive though...

JC

[Marty1]

Check here

http://www.outerlimits4x4.com/PHP_Modul ... el+economy

[chire]

thanx for all of your input has been very informative will keep a eye open for a cheap 4bdi as it beats what im getting out of my v8 (30-35 l/km off road )cheers.

[KiwiBacon]

I will soon be selling an Isuzu MSA-5P gearbox which has been modified to fit an 85 Rangie.

It's had an extended shifter grafted onto it to protrude in the same place as your factory box. WIll come with an adaptor shaft to an LT230 gearbox.

To fit and work it will need:
1. An Isuzu 4B series engine.
2. The back housing off an LT77 box.
3. A 75mm aluminium adaptor plate which I can provide all the dimensions for.

I may be able to sell part #3 as well, depending on how my plans proceed.

New bearings before installation would be a good idea. No noise when driven but it's not as tight as the MSA-5G I'm replacing it with.

I recently installed a 1:1 ratio LT230, I now get 11km/l on a flat level run. That's a hair over 30MPG.
Was getting approx 9.5 km/l with the 1.2:1 ratio LT230.

[1103.9TD]

Got the 3 inch mandrel bent side exit fitted just before I left for work, sorry no photo's till I get back. It goes much better off the mark, taking far less time to spool, and expelling heat much more efficiently, the bulkhead is cool after a decent run, missus delighted. Even better, it sounds like a military tank, obsolutely wicked!. Oddly enough with the side windows up, the vehicle is much quieter than with the old standard exhaust!. Initial fuel figures look promising, as yet I have not adjusted the pump, on a run across to Einsleigh Pub, via Georgetown, and back via The Lynd, consumption was just under 12ltrs/100k, and we had the vehicle fully loaded - not bad...can't wait to get back & head back up the Cape for a spot of fishing ....