Thread: Sluggish at low revs - TD5

Originally Posted by V8Ian

You might be onto something Roger. The boost gets to .72 bar, under heavy acceleration then instantly drops back to 60.

You should be seeing at least 1.2 bar.

There should be about 11-
12 threads visible on the actuator rod, if it's more than that it needs shortening.

I adjusted it about 12 months ago, got to a max of 1.2.

You can change to 1.5 Bar with a standard TD5. I haven’t done this mod but would be interested in having a go.

See here toward the bottom of this page here: Tech Note No.1: MAP sensor recalibration and replacement | DiscoTD5.com

I was under the impression that the Disco had a waste gate modulator and the Defender just had a boost operated wastegate. If that is the case I am not sure how you would compare one to the other.

Originally Posted by slug_burner

I was under the impression that the Disco had a waste gate modulator and the Defender just had a boost operated wastegate. If that is the case I am not sure how you would compare one to the other.

They both have a wastegate actuator that is operated on by boost pressure and ambient pressure.

The D2 auto has an electric modulator (controlled by the engine ECU) in-between the boost supply , ambient supply and the actuator.

This allows turbo surge to be actively mapped out, whilst also allowing max boost levels to be achieved without compromise elsewhere.

Originally Posted by V8Ian

You might be onto something Roger. The boost gets to .72 bar, under heavy acceleration then instantly drops back to 60.

I've had the modulator go and that was the symptoms pretty well, it would surge, go ok then gutless then ok etc

Originally Posted by simonmelb

You can change to 1.5 Bar with a standard TD5. I haven’t done this mod but would be interested in having a go.

See here toward the bottom of this page here: Tech Note No.1: MAP sensor recalibration and replacement | DiscoTD5.com

If you download and put Tunerpro RT on your computer (if you haven't already, it is free) and get the XDF files from his website after you get a login (he deserves a donation for his efforts) it is a piece of cake to start playing around with adding those settings in, you just follow by the numbers as you can see those entries in plain english and change the numbers in the table to suit.

The extra boost even with stock fueling gives a seat of pants improvement. Well, it felt like it to my arse anyway.

I'm going to bite the bullet, replacing the modulator and vacuum hoses. Question, is the vacuum hose metric or imperial and what total length is required?
TIA.