Thread: Thunderbolts Way & TD5 lack of power on hills.

I have no idea how a TD5 Defender converted to auto would perform but the Discovery the only auto TD5 ran more boost than the Defender.
You could up the boost as it sounds you are only running 1.2 bar but if you go too far you will end up with an overboost situation.
I guess the other question is what transfer case ratios you are running?

Id check it out and make sure there is nothing wrong (no errors in the ECU) and maybe invest in a remap. But as the car is a 2001 it would of originally had a MSB ecu that couldn't be programmed without physical intervention.
BUT the question is what did they do when they did the conversion maybe it has an NNN ECU

Not sure what Jose (TD5inside) could do for you he may be able to send you another ECU if it is an MSB or a remap if it is a NNN the next step would be another intercooler and if you want to spend a bit more try one of his hybrid turbos.

Don't know anything about the road you mentioned but either its hideous or the car is a lot worse than any TD5 I have driven

A bit out of left field, but have you had the auto, and more particularly, the torque convertor checked? I can't speak for a Defender, but there is no way my Disco would be doing what you describe. Thunderbolt's can be steep, but not that steep, and TD5s go well when on boost.

Transfer case is a Disco one-No errors on Nanocom and the ECU is original with the 4HP22 being rebuilt 1 year ago and cable operated.
Fuel pump isnt noisy but is another thing im thinking about.
Mooney Mooney bridge and the Orimba hill on the Newcastle/Sydney freeway are also terrible with speeds down to 75 or 80 if i dont hit them at about 120.
Typical for me is to be in the right lane over the bridge at 120+ then cut across 3 lanes to the slow lane part way up the hill.
Im a bit over doing that and would love to just sit at 110 no matter what. This is next to no load also

What size tyres?

Originally Posted by timax

Transfer case is a Disco one-No errors on Nanocom and the ECU is original with the 4HP22 being rebuilt 1 year ago and cable operated.
Fuel pump isnt noisy but is another thing im thinking about.
Mooney Mooney bridge and the Orimba hill on the Newcastle/Sydney freeway are also terrible with speeds down to 75 or 80 if i dont hit them at about 120.
Typical for me is to be in the right lane over the bridge at 120+ then cut across 3 lanes to the slow lane part way up the hill.
Im a bit over doing that and would love to just sit at 110 no matter what. This is next to no load also

Strewth. I could almost beat you up there in the Scania.. Definitely something wrong IMO. Still, at least you don't have to worry about the wet weather speed cameras.

Stock engine and 235/85's?

It's overgeared with the 1.2:1 t/case IMO.

IIRC I was able to maintain 105km/h coming south up out of Mooney Mooney with an absolutely bog stock D2 fully loaded up from three weeks out west and a roof top tent as a parachute!

Yep something's def wrong. The first time I drove a td5 was about 10 years ago. A mate of mine, who is horrible to any car he drives, had a 130 td5 with an old Telstra steel work back full of tools on it, weighing in at 1.4t. We surfed at Myponga (in SA) and I drove it back to Goolwa - pulled 110km/hr up that dirt track which is really steep. Kept going like a train on the rest of the hills but I backed off a bit when I realised the 'tail wagging' wasn't due to the loose dirt road but was actually very worn rear suspension/yoke components

Originally Posted by rick130

Stock engine and 235/85's?

It's overgeared with the 1.2:1 t/case IMO.

IIRC I was able to maintain 105km/h coming south up out of Mooney Mooney with an absolutely bog stock D2 fully loaded up from three weeks out west and a roof top tent as a parachute!

Interesting , i thought the Disco transfer case was the thing to have? Oh and yes stock wheels and tyres. I cant remember the rpm at 100kph but might check back with that info.
Changing down a gear though just makes more noise not a surge of power