Thread: Mod 300tdi vs isuzi 4bd1t

All ready planned om extra ventilation in the engine bay.

Cheers Mickey.

Originally Posted by PAT303

I agree with Rick,with tall transfer gears and tyres you are going to struggle.

I wouldn't think so.

Run the Isuzu box (I have an MSA-5G), they have a decent ratio spread (1st = 5.8:1) and you'll never break them.
I run a 1:1.003 LT230R behind my 4BD1T and Isuzu box, it spins wheels in second on dry tarseal.
When I had a 1.2:1 transfer box I towed a dead toyota Dyna over a mountain pass in second without issues.
First gear is only needed for slow work, like launching boats. Same for low range.

The 1.2 transferbox in 4th with those tyres will give you about 2300rpm at 100km/h. That's ideal for towing IMO.
5th with the isuzu box I've got would give 1750rpm at 100km/h.

The only time my rangie ever gets hot is rallying up skifield access roads. That's low speed and full load combined with 2000m of altitude and engine intake temps of 130 deg C. I'm using a rover V8 radiator and no intercooler.

Dougal, Pat's talking about the 300tdi.

Oh, and I wouldn't use EBC pads, they tend to vary too much, batch to batch. Either Ferodo 4WD or if you are really going to cane them, Formula Ferodo (DT2000) compound.
Castrol Response Super DOT 4 is also adequate as a brake fluid. Much, much cheaper than SRF.

The Isuzu 4BD1-T is the better option for towing, but if you only have short distances a tweaked 300Tdi may be acceptable.

In addition to what others have said, you should add:

• an oil cooler to the R380 if 130's don't already have one
• a decent intercooler upgrade
• an EGT gauge

The VNT turbo from an International 2.8HS (contact Jase on this forum) will be much better than the MTQ turbo.

OK so if I go Isuzu what do I have to do and purchase to do the conversion.

Cheers Mickey.

If your going to go the turbo upgrade that will set you back a few $k. Why not got the VNT with the 2.8 motor I expect that it should be up around $12K - $14K but you will get a new motor that has had all the 300 Tdi issues sorted.

But if it comes down to 300 Tdi vs 4BD1T if you can put up with the NV then there is no replacement for displacement.

If you are going down the 4BD1T path, here is a link for a V8 to 4BD1T conversion. There should be a lot of similaraties.


http://www.aulro.com/afvb/isuzu-land...onversion.html

Originally Posted by Bush65

<snip>
In addition to what others have said, you should add:

• an oil cooler to the R380 if 130's don't already have one

<snip>

Thank's John, forgot about that.

If you don't have an oil cooler, you'll be changing Syntrans every 20,000km, if not sooner. Even most 75w-90's can't cope with the heat. The only one that stands a chance is Motul Gear 300, and I haven't tried it to see how it works yet (15.2 cSt @ 100°C and a VI of 222 !!)
It's more fluid than Syntrans at 0° too ! and doesn't thin out near as badly at high temps, and being a (buffered) GL5, gives much better gear/bearing protection if the temps get excessive

Syntrans Visc @ 0°C = 480 cSt
Gear 300 Visc @ 0°C = 425 cSt

I'm currently running Torco RTF, and while a touch slower change when cold, it's really no better than Syntrans when warm/hot.