Nissan Patrol 4x4 (Africa)

hugejp wrote: ↑16 Dec 2020 12:23

Well said Peter.

Both my TB48 & TD42 have been slightly modified. They both have pro's and con's, but again I couldn't choose a favourite.

Michael wrote: ↑17 Dec 2020 06:48

hugejp wrote: ↑16 Dec 2020 12:23

Well said Peter.

Both my TB48 & TD42 have been slightly modified. They both have pro's and con's, but again I couldn't choose a favourite.

Slightly modified.........

Michael wrote: ↑17 Dec 2020 06:57 This really comes down to personal prefrence I think. If like Graham you enjoy the very smooth and quiet engine with a AT then the 4.8 will always be your pick.
If you like a manual box, loud exhaust's and more torque then the TD42 might be higher on the rankings.

I would actually like to be at another dyno day to compare more midified engines. There are allot more TB48 turbos on the road now and lots of new development have been done on the TD42.

As Peter also mentioned, the TB48 is a great out of the vehicle to tackle the dunes, but on the last Goerapan trip I was on, the standard TB48 was no match to the TD42T on both the 1/4 mile and the dunes....... but then again, the turbo TB48 had the upper hand on the TD42T

Peter Connan wrote: ↑16 Dec 2020 12:15 This is like asking whether an lion or a hyena is the best predator.

Hyenas have a much better kill ratio, but they cannot take care of buffalo. Nothing but lion can do that.

If you compare the engines in their original guise (IE both non-turbo), the TB48 will be more powerful and have more torque at any speed, but it will use more fuel. The TD may last longer, but I think that has more to do with how they are likely be used than with the engines themselves. The TD will require more maintenance but that maintenance will be slightly easier to perform, and for small problems it will probably be easier to find a mechanic that will be able to fix it.

If you compare a normally aspirated TB48 with a turbo-charged TD42, then the exact specification of the TD becomes the determining factor. If we are looking at the TD42T as sold in South Africa (it was only ever sold locally with a very low pressure turbo, really more an altitude compensator) and not modified, then I think the same applies. The TB48 will still have more torque at all RPM's.

If the TD42 has the high-pressure Australian spec, the UD40 lorry spec or an aftermarket/modified turbo setup (which I think is the most common basis for comparison, although it is to my mind an unfair comparison), then it depends very much on what has been done to the TD. Let's assume a fairly typical setup comprising standard compression ratio, a 10mm pump and boost of around 1 bar, then the TD will have considerably more torque between about 1600 and 2500rpm, which is exactly the rev range you are likely to cruise in. That means you get a more relaxed cruise, with fewer gear changes and better towing ability but still better fuel consumption and little change in reliability, assuming you control the engine based on temperatures. A TD42 with anything over about 0.5-0.8 bar boost becomes an engine that you need to drive with an eye on the temperatures, and if you don't you WILL break it before very long.
However, it will also still be more economical. The TB48 will probably still have a bit more maximum power at high RPM's and will have a flatter torque curve.

If you compare a boosted TD42 to a boosted TB48, the TB48 is once again in the lead with regard to both torque and power, potentially by a massive margin, but it will also be more expensive to get there.