 | Home > Puma (Tdci) > High/low range switch on Puma LT230 |
 
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530   
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Hi all, looking for some insights...
On the TD5, some people would shunt or disconnect (depending on... MY?) the high/low range switch on the transfer box, as this changes the throttle response. On the Puma, I think it also changes the anti-stall logic and keeps the EGR closed (is that actually true?), so I wondered if anyone has done that on the Puma and what has been the outcome/benefits. If I was to do it, I'd rather do it "properly" by fitting a switch in the cabin, so I'd need the right connector to plug the wire from the ECU, i.e the one found on IGM500011. Do you know where I could find the connector alone without the whole assy (not that it's very expensive either, but it's a bit of a waste to purchase the assy for just that little piece of plastic)? “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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10th May 2017 8:54am |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6478  
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IGM500011 is the difflock switch, despite what the parts catalogue and online suppliers state.
IGM100000 is the high/low switch. Way more expensive! It's a Sumitomo HW090 series connector which may help you track it down.  1988 90 Td5 NAS soft top
2015 D90 XS SW |
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10th May 2017 11:21am |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530
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From the look of it, it looks like the 3-way variant (3P090WP-HW) from this page:
http://www.easternbeaver.com/Main/Elec__Pr.../smhw.html Am I right? Anyone ordered from these guys before? Looks like they're from Japan. “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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10th May 2017 1:22pm |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2586  
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but why?
in low range, the throttle response is smoother so that you can have more control over the vehicle, so why would you want remove that!?  --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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11th May 2017 9:05am |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530
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It's the opposite actually, the goal is to have the smooth throttle response on high range, fooling the ECU into thinking it's in low range even in high range. “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
-- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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11th May 2017 9:39am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2586
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Oh, I misunderstood, sorry.
Good luck, and let us know how it works out  --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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11th May 2017 9:42am |
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| Phil VM2.5 Member Since: 28 Mar 2012 Location: Limelette Posts: 196  
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Hi,
I have disconnect it. The reason is not a question of throtle response but because no power in low range. I lose the antistal so the best will be a switch Phil current : defender 110 sw 2.2 puma 2012 and 230.000km today and again my Range Rover VM2.5 engine from 1992 and 528.000km today. One ten 1988 to 1992 1987 BMW GS80 One Ten from 1984 to 1987 One Ten from 1983 to 1984 Serie 3 109 from 1980 to 1983 from 1974 Jeep CJ3B and CJ6 |
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12th May 2017 1:52am |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530
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So I ordered the HW090 connectors, received within a couple of days (from Japan, amazing service!)
Unpacked the bits and pieces:
A high-tech electronic design: 
So that I have a male and female plug that I can put between the two original connectors:
Installing the cable takes 2 minutes at most, it's very easy from under the car, so I didn't bother with running a cable back into the dash and installing a switch, partly because I'm lazy and partly because I wanted to try first and see how it affects drivability... Took it for quick test drive, it feels different, throttle seems more responsive, as if there were fewer electronic gizmos playing behind the throttle, a bit like an old fashioned cable throttle. Anti-stall clearly uses a different strategy and kicks in a lot earlier. EGR is unaffected (according to the scanguage) and plays its role just as before. I'll keep it like that for a few days to see if I like it or not... “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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19th May 2017 4:52pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19531
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Remember you can disable the clutch switch too, but still keep antistall.
It'll prevent the rev overrun especially in low. Diesels Lives Matter. ⛽️🛢️👨🔧🧰⚙️ And if You Love the Country, then we’re on the same side ~ I got’ love for Britain, I got’ British pride’. 🇬🇧 |
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19th May 2017 5:36pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16857 
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Can you elaborate on this since I don't understand what you're getting at? Anti-stall only operates when there's no throttle input, how can you get "earlier" than this? |
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19th May 2017 5:36pm |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530
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What I mean is anti-stall increase in low range, it seems it pulls harder when the ECU "believes" it's in low range. “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique.
-- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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19th May 2017 6:24pm |
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| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530
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By unplugging the switch, or shunting it? I tried shunting the clutch switch some years ago, with mixed results... “A Land Rover immobilized is a moral defeat for the driver and bad publicity for the vehicle, […] it's up to you to do justice to your Land Rover!” - Land Rover Driving Technique. -- 2009 2.4 Puma Defender 90 SW 1979 Land Rover Series 3 88" |
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19th May 2017 6:31pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19531
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I've just used a J.P.T. Connector and a wire loop to effectively join the clutch switch wires together. To create a closed circuit. The TD5 can just be unplugged and left open. Everything the same pretty much except for revving in low range. Diesels Lives Matter. ⛽️🛢️👨🔧🧰⚙️
And if You Love the Country, then we’re on the same side ~ I got’ love for Britain, I got’ British pride’. 🇬🇧 |
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19th May 2017 7:17pm |
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