Thread: Isuzu into D1/RRC

What is there to do to a 85 RRC so one could fit the 4bd1 as i have both here and would love to put the whole shebang together just for the sake of having a good long distance truck ....

Ive got a 85 RRC and a rusty old 84 mod S3 stage 1 the RRC is in good shape tho has the 3.5 with the 5spd and the stage 1 has the 4bd1 with lt95 and has only done 160k with religious 5k services so it should make a good combo ...

Also what sorta aftermarket turbo is the go for this engin and what sorta mods dose it need to the fuel pump and will an inter cooler and large exhaust help gain the sorta grunt of the 3.5 ...

Cheers

Chris

Originally Posted by justinc

Hi Dan,
I would give the R380 a try, I wanted the LT95 because I wanted to tow campers to remote areas etc and my motor pumps out a fair bit of torque etc, there is no reason why a rebuilt R380 with a sensible boost and fuel setting shouldn't last driven normally.
At least it will keep the $$$$ down.

JC

JC is renowned as being hard on gearboxes, esp autos

There are a few 4BD1 Rangies in southern QLD, some turbo, some not. I am sure you could get a drive of one somewhere.

Originally Posted by 100I

...
Shame about the R380, a complete replacement driveline is a bummer. Wonder how many R380 rebuilds could be justified versus swapping out the lot. Would it break in spectacular fashion or does it just chew bearings etc. I like to think I'm nice to gearbags, I've never broken one yet.

The R380 was beefed up from the LT77, but the early models, suffix 'J' are known for braking mainshafts because of a bad stress raiser. This was fixed with suffix 'k'. Suffix 'L' (current model) is stronger again.

It is the torsional vibration at low revs that causes the transmission problems. The 4BD1 is a big 4 cyl diesel that produces a lot of torque from each cylinder at idle. As a 4 cyl, the torque is delivered as 2 impulses per rev.

The less you allow it to pull a load at near idle speed (and it will), then the more life you will get from the gearbox.

Originally Posted by lokka

....
Also what sorta aftermarket turbo is the go for this engin and what sorta mods dose it need to the fuel pump and will an inter cooler and large exhaust help gain the sorta grunt of the 3.5 ...

Cheers

Chris

GT25 turbo (or equal) - particulars depend how much boost you want (and how far you turn up the fuel).

Exhaust manifold from either, a 4BD2-T, or you have the capability of making you own manifold.

Adjust the injection timing as for the turbo engine.

To increase fuel, screw out, the full load fuel screw on the right side of the govenor housing.

Intercooler and large exhaust will allow more grunt than the 3.5

Originally Posted by Bush65

GT25 turbo (or equal) - particulars depend how much boost you want (and how far you turn up the fuel).

Exhaust manifold from either, a 4BD2-T, or you have the capability of making you own manifold.

Adjust the injection timing as for the turbo engine.

To increase fuel, screw out, the full load fuel screw on the right side of the govenor housing.

Intercooler and large exhaust will allow more grunt than the 3.5

Sounds like sum good advice there john maby il have to come see you again one day and have a bit more of a yarn hay

As for the fabed exhaust manifold that sure is a do'er
and i need to get some other bits profiled so mite as well get a bunch of stuf done at once

Originally Posted by Bush65

The R380 was beefed up from the LT77, but the early models, suffix 'J' are known for braking mainshafts because of a bad stress raiser. This was fixed with suffix 'k'. Suffix 'L' (current model) is stronger again.

It is the torsional vibration at low revs that causes the transmission problems. The 4BD1 is a big 4 cyl diesel that produces a lot of torque from each cylinder at idle. As a 4 cyl, the torque is delivered as 2 impulses per rev.

The less you allow it to pull a load at near idle speed (and it will), then the more life you will get from the gearbox.

Hmmm yep and this is just the type of driver I am, a habitual short shifter.

Originally Posted by justinc

5).... You need to be about 2200Rpm at 100kmh for good fuel economy etc. ( That is for a turbo engine, and personally I wouldn't fit anything else)
6)My 4BD1 turbo with intercooler produces about 20% of the smoke of a tweaked 300Tdi, and will pull heaps harder from 1000rpm. I would say it would pass an emissions test, but check that you are allowed to fit an earlier engine to your Disco, as some states now won't let you go backwards in manufacturing years.(Stupid, as some early diesels have less harmful emissions than equivalent petrol...)
JC

With the bit looking around I've been doing, my biggest problem is likely #6, the emmisions laws. The 4BD1 appears to have been phased out around 94 with the move to the indirect 4BD2/T (whereas I thought they were still in the trucks till late 90's). So I won't get an engine of the same age as the car. 4BD1 are still marinised it seems but they don't meet modern ADR.

Maybe I need to find a schmick RRC and go from there?
Trouble with that is finding one.
No, trouble with that is SWMBO actually prefers the look of the Disco over a Rangie.
Hear that? About 2000 Rangie owners just choked on their Martini

I also paid more attention to my tacho and the R380, at 100k, spins at 2150 in 5th, 3000 in 4th, 4100 in 3rd.
Bit of a jump for an oiler from 4th to 5th so a turbo is not negotiable.

Originally Posted by lokka

Sounds like sum good advice there john maby il have to come see you again one day and have a bit more of a yarn hay

As for the fabed exhaust manifold that sure is a do'er
and i need to get some other bits profiled so mite as well get a bunch of stuf done at once

No problem Chris, might be able to help you with a turbo (but not the manifold).

Here is a pic of a manifold someone made for a Cummins 4BT (very similar to the 4BD1-T). He reported gave about 5psi increase in boost and exhaust gas temp 100*F lower.

I'm getting ready to swap my 4BD1-T from the bushie into the rangie. While it is out, I plan to do some mods - aiming for over 200 HP.

Originally Posted by Bush65

No problem Chris, might be able to help you with a turbo (but not the manifold).

Here is a pic of a manifold someone made for a Cummins 4BT (very similar to the 4BD1-T). He reported gave about 5psi increase in boost and exhaust gas temp 100*F lower.

I'm getting ready to swap my 4BD1-T from the bushie into the rangie. While it is out, I plan to do some mods - aiming for over 200 HP.

Shyte 200 ponies sounds great il defiately have to have a yarn to ya now

That exhaust looks sweet ive always thought a good set of pipes for a deso turbo would reap some nice benifits