DEFENDER2.NET - View topic

↓ Advertise on Defender2 ↓

Home · FAQ · New Posts · My Posts · PMs · Search · Members · Map · Calendar · Profile · Donate · Register · Log In

Home > Puma (Tdci) > "idle jack"

Page 2 of 2

Print this entire topic ·

nickhodgson

Member Since: 08 Dec 2009
Location: Zambia
Posts: 174

Hi Blackwolf

For all the situations you describe I agree the anti stall is great. I especially like it towing my trailer or driving up my ramp in low range at idle as well.

My point was about the Puma engine "making a fuss" (increased vibrations) as it tries to increase the revs when you are in the wrong gear for the puma when in the older 300tdi you can get away with it and the engine still runs smoothly. It definitely feels not good for the engine or car in the Puma when you are in the wrong gear but the 300tdi seems pretty happy at very low revs - no power but does run smoothly.

Cheers
Nick 1995 300tdi Defender 90 P/UP
2011 Puma Defender 130 D/C
2000 300tdi Defender 110 P/UP
2015 Discovery 4 SDV6 HSE

20th Jan 2016 5:18am

lohr500

Member Since: 14 Sep 2014
Location: Skipton
Posts: 1316

2013 Defender 110 Puma 2.2 XS CSW Santorini Black

Thanks for the explanation Blackwolf

20th Jan 2016 6:10am

Smurph

Member Since: 29 May 2013
Location: Zimbabwe
Posts: 27

2012 Defender 110 Puma 2.2 SW Keswick Green

I agree with nickhodgson 100%. The Puma wants to drive itself in certain situations . I disconnected the idle jack and much prefer its behaviour in low range.....but still prefer the Tdi in the bush. On road different story.

20th Jan 2016 8:22am

Cupboard

Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971

2011 Defender 110 Puma 2.4 HT Corris Grey

One thing that I don't think has been mentioned about Idle Jack is how it knows to use it.
There isn't a switch telling the ECU that you're in 1st or reverse, it guesses based on wheel speed and whether you're in low range. As a result it sometimes accidentally engages Idle Jack if you're in low and not in 1st.

20th Jan 2016 1:29pm

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17363

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

That has been discussed in other similar threads in the past - I know, because I have questioned this very question (if that makes sense).

You are right, Idle Jack will quite often activate in ANY low range gear .

As you say, all the ECU knows is that low range is selected, the engine speed, and the aggregate wheel speed (which equates to road speed assuming no loss of traction). You may not like the feature (or indeed you may), but you can't deny it's clever!

20th Jan 2016 2:09pm

Page 2 of 2

All times are GMT

Jump to

< Previous Topic | Next Topic >

Posting Rules

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum