 | Home > Puma (Tdci) > Switchable low range map - anybody done this? |
 
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389   
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On the TDCi the tune/throttle map is different for low range and high range and the switch between the two appears to be controlled by a sensor on the transfer box.
The standard low range map is hopeless in certain off road conditions, far too unresponsive with the result that you have to anticipate a need for more revs sometimes seconds ahead, or the damping in the throttle map means that power delivery is too slow and you get stuck. Dropping the front end into a soft ditch is the classic example, where you drop gently into a ditch and then as the wheels hit the bottom, add revs to push through it. Suddenly hitting an unexpected soft patch in wet peaty ground is another, you boot the throttle and nothing happens for a second, which sometimes is too long and momentum is lost. I've now got the BAS remap and I have yet to try low range in proper off road conditions to see whether it's different, but the fix that some have applied to standard vehicles here is just to disconnect the sensor which reverts the ECU map to the high range tune, which is much better for most of our off road conditions. The logical extension of this is to divert the ECU input that normally comes from the t/box sensor to a switch, and have them selectable on demand, as there could be times when the high range map is a bit too sensitive. I can't immediately think of a reason why low range mapping would be used in high range, but the option would be there. I was thinking of doing this simply by finding another plug that would fit and running a pair of wires back up to a latching on/off switch on the dash somewhere. Has anybody done this, if so did it work, and what type of plug is it / any pointers to suppliers? I imagine somewhere like VWP may sell something suitable, the sensor plug looks rather like the plug on the back of an indicator light, though I haven't compared them side by side. I presume it's a normally open connection, given that disconnecting the switch defaults to high range tune, and that it isn't necessary for the wiring or the switch to carry any significant current. I can't see why it would not work but just wondered if anybody could confirm from having done it? --- 2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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29th Nov 2018 10:58am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6479  
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https://www.defender2.net/forum/topic54410...nsfer+plug
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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29th Nov 2018 11:07am |
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| edo Member Since: 20 Aug 2018 Location: Surrey Posts: 359
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Have the Bas remap (in 170 mode), will be off road on Saturday and will report back!
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29th Nov 2018 11:30am |
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389
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Thanks
£60 for the switch  ---
2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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29th Nov 2018 11:32am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6479
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If you want a manual switch, you need your choice of switch and a male plug.
1988 90 Td5 NAS soft top
2015 D90 XS SW |
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29th Nov 2018 12:05pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2069 
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Just wondering but I dont really understand the point of this?
In low my throttle is sharp and super responsive and in high its smooth but still very responsive (TD5 btw, TD5inside tuned) Instagram @defender_ventures Empire Tuning - Agent |
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30th Nov 2018 9:00pm |
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| AndrewS Member Since: 10 Apr 2007 Location: Hereford Posts: 3707 
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If you drove a Puma you would understand
 130's have feeling's as well you know  |
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30th Nov 2018 9:07pm |
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| BogMonster Member Since: 05 Feb 2008 Location: Stanley Posts: 389
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Indeed
I had a bit of a run over some bumpy ground the evening before last and the BAS low range tune is much better than the standard low range so I am in two minds, but my first port of call is a query to BAS to see if a lightly tweaked version is possible. I had tried disconnecting the clutch switch (used to do that on Td5s a few years ago) but it was awful, I hadn't tried bridging it though. --- 2006 Defender 110 SW 300Tdi • 2011 Ford Ranger XLT crewcab • 2015 Defender 110 Station Wagon Utility TDCi |
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1st Dec 2018 11:50am |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19560
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Yes, you need to bridge it on a Puma. They cannot be just unplugged without issues.
On a TD5 as you mentioned it I should fine just to un-plug. Just a suggestion to toy with anyway. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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1st Dec 2018 6:09pm |
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