Thread: TD5 - safe increase in power and torque

Didn't I read on here the other day, that the D2a 2003 model has a larger intercooler than the original D2?

Or is that just wishful thinking?


As far as power mods go, before you get the chip done, do the EGR mod, and the centre muffler. Oh, what a feeling - Land Rover

The D2a's bellows-type exhaust flex joint is very restictive as it has only just over 50% of the cross-sectional area of the pipe either side due to its internal length limiter. It makes a mockery of the rest of the 2.5" exhaust.

Originally Posted by Basil135

Didn't I read on here the other day, that the D2a 2003 model has a larger intercooler than the original D2?

Or is that just wishful thinking?


As far as power mods go, before you get the chip done, do the EGR mod, and the centre muffler. Oh, what a feeling - Land Rover

It's a thicker intercooler than the early type.

Originally Posted by Redback

Sorry no mine is a manual.

I'm pretty sure someone on here has fitted an extra cooler after he was having overheating transmission problems when towing.



JC what about another cooler added in the system, as I mentioned above I'm sure someone has done it.
Baz.

Baz,

Technically a good idea, provided the plumbing is spot on. The LR 4HP22EH has some high pressures and therefore high volumes of fluid flow, and in order not to create a critical pressure/ flow drop in the cooling system, pipework and bends/ joiners etc etc need to be kept to a minimum, and as few sharp bends etc as possible. I have no doubt it is possible, like the P38a cooler, but needs to be carefully fitted/ plumbed.

JC

Originally Posted by justinc

Mike, I recently went to fit a P38a tranny cooler to a D2, only to discover the same problem. There is very little room, and the plumbing would want to be pretty carefully routed. I would give it a go with my own vehicle though nothing is impossible, the customer didn't want to pay for the extra R&D time, which is fair enough

JC

Theres not really room where the OE one is, I guess unless you thicken one up. The prob in that spot is tha they clog with mud and you cant clean them.

I've got an additional cooler, so the ATF passes through 2 coolers in sequence. All fittings absolutely must be hgh pressure fittings and likewise with the cooler core. Low pressure stuff doesn't cut it on the 4HP22EH at least and I would expect the 4HP24EH to be same. Cant comment on the non EH autos. The additional cooler sits in front of the radiator pack and behind the grill. My one is from Davis Performance Landys and has made a world of difference to the autos longevity.

This is how the OE ones come out despite radiator cleaning



I tried a tube ATF cooler. This one doesn't handle the pressure and failed quite a few times in the fittings. Great for most autos, but not the ZF which runs up to 125psi in the lines instead of 25psi.



The DPL one has been in for ages now and never ever indicated that it even might give probs. full high pressure setup with pressure fittings

Simon, Had a Defender 130 Tdi and 4HP22 recently where they had fitted the cooler behind the 12,000lb winch drum...needless to say the box didn't last very long

Yours looks like it'd get some cool air though

JC

Originally Posted by justinc

Simon, Had a Defender 130 Tdi and 4HP22 recently where they had fitted the cooler behind the 12,000lb winch drum...needless to say the box didn't last very long

Yours looks like it'd get some cool air though

JC

Thats a really interesting point JC. Expecially considering that the OE ATF cooler sits behind a bull bar, winch and AC condensor and then that air is still restricted by the engine radiator. It must make a huge difference when the ATF cooler isn't operating at notably high temps, but is temp sensitive.

This one made the world of difference. I can plug through soft sand all day long or tow laden trailers up through winding mountain roads etc and the auto has indicated that its warmed through the shift pattern, but never brought on the "too late" light.

Originally Posted by Slunnie

Thats a really interesting point JC. Expecially considering that the OE ATF cooler sits behind a bull bar, winch and AC condensor and then that air is still restricted by the engine radiator. It must make a huge difference when the ATF cooler isn't operating at notably high temps, but is temp sensitive.

This one made the world of difference. I can plug through soft sand all day long or tow laden trailers up through winding mountain roads etc and the auto has indicated that its warmed through the shift pattern, but never brought on the "too late" light.

I knew I'd seen something on this those pics are from your web gallery tech section aren't they Simon

Baz