 | Home > Technical > Defender Hand Throttle for utility applications |
 
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| Skeggy 90 Member Since: 07 Oct 2013 Location: Skeg Vegas Posts: 231   
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2 throttle pedals will not work as the engine ecu reads 2 resistances from the pedal one is half the other, this is for safety in case of a wiring fault. It would only work if you switched between the two pedals, but this would need to be seamless or the engine will go in to limp mode. Or you could switch pedals with the engine turned off. My old 110 had an engine driven 110 volt generator and that used a little box to increase engine revs. Or you might be able to use a cruise control. Or make up something to push the throttle pedal down mechanically. 90 300 TDI SW (sold)
130 TD5 Utility (Foley SV) (sold) 110 TD5 Hardtop (sold) 110 TDCI Utility (sold) 1st Edition Range Rover Sport Supercharged Velar P380 HSE Discovery 1 V8 auto Puma 130 Double Cab (sold) R35 GTR Defender 110 300 TDI CSW (sold) 2010 110 XS Utility |
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22nd Jan 2015 10:38pm |
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| big steve Member Since: 24 Dec 2009 Location: hertfordshire Posts: 2456  
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If it's something people want I will talk to someone and get it done ? 2015 2.2 tdci hardtop xs
3.2 conversion DONE 238bhp and 707nm torque and thats just the start ;-P hybrid turbo in build -done ready to fit ashcroft atb in transfer box 6 speed auto in build |
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22nd Jan 2015 10:41pm |
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| AndrewS Member Since: 10 Apr 2007 Location: Hereford Posts: 3707 
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22nd Jan 2015 10:54pm |
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| Martin Site Admin Member Since: 02 Apr 2007 Location: Hook Norton Posts: 6482 
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Somewhere I have a circuit diagram for a hand throttle, pretty sure it was German in origin
 1988 90 Td5 NAS soft top
2015 D90 XS SW |
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22nd Jan 2015 10:54pm |
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| uncas Member Since: 22 Nov 2012 Location: Wentworth near Rotherham Posts: 340
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It's not impossible to do I'm just not smart enough to do it.
Uncas |
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22nd Jan 2015 11:03pm |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5422 
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I think two pedals assemblies would work, but you would need to switch one off whilst using the other, so system did not know there were two controllers. I don't know if that could be done by just switching the neg from to the other, or as which on all wires.
If any body wants a play I've got a spare peddal assembly. Andy |
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22nd Jan 2015 11:12pm |
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| big steve Member Since: 24 Dec 2009 Location: hertfordshire Posts: 2456
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I'd do it but I need a transit pedal
 2015 2.2 tdci hardtop xs
3.2 conversion DONE 238bhp and 707nm torque and thats just the start ;-P hybrid turbo in build -done ready to fit ashcroft atb in transfer box 6 speed auto in build |
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22nd Jan 2015 11:15pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16879 
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I think there's another flaw with the approach of using a modified pedal. With my 2.4, if I rev the engine with the vehice stationary and hold the pedal stationary, after a short time the revs drop right back down again. If I manipulate the pedal I can keep them constant-ish, but it takes a fair bit of manipulation.
I am forced to the conclusion that the throttle management strategy assumes a fault if the pedal remains pressed with the clutch and the vehicle stationary, and this would scupper completely any throttle-pedal-based hand throttle adaptation. |
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11th Mar 2015 12:44am |
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| Supacat Member Since: 16 Oct 2012 Location: West Yorkshire Posts: 11018 
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I wonder whether the clutch pedal position switch may come into play as well.
"The clutch pedal position switch is a pressure transducer type. When the clutch is pressed the switch disconnects a ground connection to the ECM, which reduces engine torque. In the event of a clutch pedal switch failure, there may be some loss of driveability in the form of poor acceleration and reduced power." |
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11th Mar 2015 10:42am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16879
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I am sure that the clutch pedal switch is a factor.
In all, we have an engine management strategy which takes into account road speed, engine speed, transfer gear selection. clutch position, throttle pedal position, brake application, and engine load (and possibly other things) and figure out from all these what to do with the fuelling. The strategy includes fault management including a reduction in engine speed in the event of throttle application when not moving, or in the event of simultaneous brake and throttle application (try drying the brakes off after fording and see what happens!) etc. A simple brick-on-the-pedal approach to hand throttling simply isn't going to cut it! Perhaps the high cost of the factory fit solution is becoming more understandable! |
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11th Mar 2015 2:57pm |
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| Sticky Member Since: 07 Dec 2008 Location: Derbyshire Posts: 245 
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I've got a factory fitted hand throttle on my 300 TDi.
It's just a ratcheting handle similar to an old choke cable system. Clearly the 300TDi is a more simple engine but I wouldn't be surprised if the factory option is the same, even now. |
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12th Mar 2015 12:20am |
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| Andy80 Member Since: 31 May 2013 Location: Essex Posts: 484 
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Hi Sticky,
Have you a picture of the factory fit setup? Thanks Andy Working towards Carry on camping! |
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12th Mar 2015 9:26am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16879
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Pre-TD5, a hand throttle is easy. On the TD5 it's not (as far as I know) too diificult, since the engine management strategy is less sophisticated than the TDCi.
The TDCi is almost impossible without the factory modified ECU. |
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12th Mar 2015 9:34am |
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| JWL Member Since: 26 Oct 2011 Location: Hereford Posts: 3443 
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Most of us have probably come across the difficulty of trying to maintain a fast tickover when jump starting another vehicle. you just have to bite the bullet and just leave the throttle alone, if your alternator is in good condition it will pump out a good charge on tickover anyway.
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12th Mar 2015 9:35am |
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