Thread: Mod 300tdi vs isuzi 4bd1t

Originally Posted by rick130

even with a 235/85 and stock fuelling on a 300Tdi you'll need second low for starting when towing. (speaking from experience towing horses)
It's been years since I've been in an Isuzu Defender, but from what everyone tells me that has/has had them, the off idle torque with the Isuzu is fantastic.
Increasing the fuelling in a 300tdi is well worth it in my experience, although even with a 3"exhaust, it's still doughy on 255/85's starting off.
Small displacement does that.
I'd love a VNT as I'd reckon it'd help a lot, as does the MTQ kit.
Wait for JustinC to chime in, as he's recently converted a 300Tdi CC 130 to an Isuzu turbo, and he's fitted quite a few MTQ kits to 300tdi's, but I know what he'll say (hint, he loves the 4BD1T )

Here I am!!

The 130 we recently converted to turbo/intercooled 4BD1 broke the LT85. The vehicle would pull 2 tons at 100km/hr in 5th easily, so he did, and he broke 5th gear, and damaged the mainshaft. Big $$$.
MTQ kits to Tdi's. I rate them as a good thing, BUT not really making full use without a bigger intercooler.
The 4BD1T. What can I say...Mine is fitted to a 1992 RR. It is running .996:1 High range in an Ex perentie LT95, 33" tyres, 2.5" exhaust, Garrett TB25 watercooled turbo, a large front mount I/C. With this set up and with 15PSI max boost at the manifold, I get around 490Degrees in top gear towing a camper trailer hard up a long steep hill. I just got around 12L/100KM for the whole trip, which included mud and slop low range driving, about 700KM of hilly and twisty bitumen driving(300 of it towing a camper) and I was loaded with the family and all our stuff.
I can't praise these engines enough, but get the gearing right, use a LT95 4 speed, and use a County 110 4BD1, as these are a lot smoother than the truck fitted versions.

JC

If I were to put a 4BD1-T into a 130, I would seriously consider using the Isuzu 5 speed. I'm assuming the extra wheel base of the 130 would allow the t/case to be divorced - don't know if there are cross members or floor in the way though.

Devorcing simplifies adapting the gearbox to the LT230.

The Isuzu gearshift is cable operated.

I used a 6 speed gearbox behind mine, but that involves a bit more work to adapt to the 4BD1-T. For a gearshift I used a gearlever assy from an old Toyota Corolla.

Originally Posted by Bush65

If I were to put a 4BD1-T into a 130, I would seriously consider using the Isuzu 5 speed. I'm assuming the extra wheel base of the 130 would allow the t/case to be divorced - don't know if there are cross members or floor in the way though.

Devorcing simplifies adapting the gearbox to the LT230.

The Isuzu gearshift is cable operated.

I used a 6 speed gearbox behind mine, but that involves a bit more work to adapt to the 4BD1-T. For a gearshift I used a gearlever assy from an old Toyota Corolla.

The Isuzu gearbox is short enough that you wouldn't have to move the Tcase with a clever divorced setup.
A rigid setup can be significantly shorter than an R380/LT77. Here's a rough picture of mine, the last piece of LT77 gearbox shown there is used as a hollow spacer.

Got on the phone today to price Garrett VNT turbo,no help from anyone in brissy,in fact one place said there more trouble than their worth due to the fact they need a vacumm and no bits for a manifold and he said the original turbo is probably the best one for that motor.
So at the moment no joy on sourcing a VNT and other bits needed to do the change over.

Originally Posted by xrayxray

Got on the phone today to price Garrett VNT turbo,no help from anyone in brissy,in fact one place said there more trouble than their worth due to the fact they need a vacumm and no bits for a manifold and he said the original turbo is probably the best one for that motor.
So at the moment no joy on sourcing a VNT and other bits needed to do the change over.

Someone in the UK supplies them. I thought it was Allard, but I can't find anything relevant on their website.

*edit* it was Allard, this page mentioned 675 pounds.
Allard Turbo Sport

The peope in the UK are ALLiSPORT.They are showing them as a new product and don't have them on their website yet. Pat

Originally Posted by PAT303

The peope in the UK are ALLiSPORT.They are showing them as a new product and don't have them on their website yet. Pat

Allard have been doing them for at least two years.

Originally Posted by Dougal

Someone in the UK supplies them. I thought it was Allard, but I can't find anything relevant on their website.

*edit* it was Allard, this page mentioned 675 pounds.
Allard Turbo Sport

Many people think that all VNT's have vacuum actuators, because the VNT's on modern computer controlled diesels have vacuum actuators.

But they are wrong to assume that the actuator on the VNT from the International 2.8HS is like the others. The fact is the 2.8HS does not have a computer and the actuator is powered by the boost pressure. See pic below of mine - it is clear that the hose to the actuator gets boost pressure from the compressor outlet. The other leg of the tee fitting provide pressure to the boost compensator on the fuel injection pump.

You need to contact Jase on this forum. He was the importer of the 2.8HS engine and he was able to get the manifold and turbo.