Thread: What happened to your Discovery 2 today?

Originally Posted by Slunnie

Oh wow, are they hitting 300hp now! What Nm comes with that. Awesome development!

I've not seen one dyno 300, but I guess if you can pump enough air in it could be done.

You would also need to use larger injector nozzles to be able to deliver the fuel quickly enough otherwise EOI will be too late.

They are available though, so it could be done.

Originally Posted by Slunnie

Oh wow, are they hitting 300hp now! What Nm comes with that. Awesome development!

Just did a bit of a search of 300hp (220kw) diesels under 3.0 litres and they are all upward of 600Nm which is serious twist I would suggest. Makes the standard 340Nm a little ho hum.

Thinking more of the cooling aspect with the restricted size of the radiator being a limiting factor though, power does create heat and it must be gotten rid of.

Originally Posted by shack

I've not seen one dyno 300, but I guess if you can pump enough air in it could be done.

You would also need to use larger injector nozzles to be able to deliver the fuel quickly enough otherwise EOI will be too late.

They are available though, so it could be done.

Darkside Developments (where I got my turbo and manifold) have a set of injectors for the TD5 which have higher flow rates - Firad Race Injector Nozzles for Land Rover TD5 Engines (Denso)

Go and look at alive tuning on Facebook they have Dynos of the lastest run 319bhp and 736nm

All verified and legit with standard bottom end they are pushing the boundaries

Originally Posted by RRT

Thinking more of the cooling aspect with the restricted size of the radiator being a limiting factor though, power does create heat and it must be gotten rid of.

If you could increase the number of cores would you consider relocating the intercooler, to a top mount for example?

Originally Posted by Tins

If you could increase the number of cores would you consider relocating the intercooler, to a top mount for example?

the standard radiator is fine I run 580nm and 250hp tune from
alive with 35psi of boost and doesn’t go over 88c in summer

I got a full size manual intercooler which helps but allisport sell a bigger radiator

Originally Posted by Kaaaiju

the standard radiator is fine I run 580nm and 250hp tune from
alive with 35psi of boost and doesn’t go over 88c in summer

I got a full size manual intercooler which helps but allisport sell a bigger radiator

I have the bigger Allisport radiator in my TD5 - made a significant difference, and in normal running I now can't get higher than 90 degrees C. I originally bought the radiator for heavy towing, but circumstances have changed and the old girl is now semi retired/living the quiet life. I do have a remap and about 430 Nm in a 1999 10P model.

Originally Posted by RRT

Thinking more of the cooling aspect with the restricted size of the radiator being a limiting factor though, power does create heat and it must be gotten rid of.

Heat would be the least of your problems.

In the interest of dissecting the dyno run that was posted, and keeping expectations realistic, I did some quick calculations...

At first look they are impressive figures, but if you actually look again you will realise that the torque curve is AWFUL, output under 2200 RPM is actually LOWER than a stock TD5 with stock everything.

Also of interest is that peak torque has been shifted upwards in the rev range by about 600 RPM, why would that be?

It's pretty simple, a few quick calcs tells us that approximately 35-38 lb/min of air flow is needed to make 319 hp on a TD5.

Thats if you want to stay anywhere near stoichiometric values... Which you need to.

The only way to get that much air into a 2.5 litre engine at 4000 RPM (peak power on the dyno run) is to run a pressure ratio of approx 4-4.5 @ sea level.

That's without any restrictions on the intake AT ALL, which is impossible of course.

In a perfect scenario that leaves us needing a turbo that can push 38 lb/min of air at a pressure ratio of at least 4... That's about 45psi boost.

If you go looking for a turbo that can do that, you will see that it's massively oversized for a 2.5 litre diesel, and miles out of the efficiency island, which gives you the trade off of no power until about 2400 RPM then BAM.

It would be almost undriveable as a manual and no good off road, and you'll be doing head gaskets like there's no tomorrow.

To make it driveable you would need to go a compound setup

But yeah... Impressive figures... if you don't look at the chart.