 | Home > Td5 > Hand Throttle |
 
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16927   
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There don't seem to be, other than the factory fitted option (which cost well over £2k) plus one or two aftermarket options used on utility vehicles.
The Puma, and I think the TD5, also don't allow the engine to run at a sustained fast idle by means of the throttle pedal alone. On the Puma you can demonstrate this by raising the engine speed with the vehicle stationary by pressing the pedal, whereupon you will find that after a few seconds it drops back to tickover as part of its "faulty pedal management strategy". This means that bumping up the tickover speed by spoofing a pedal input won't work. I can't remember if the Td5 is the same, I think it is. If you do build something I'd be interested to know how you get on. |
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26th Jan 2021 2:12pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10 
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Hi Blackwolf,
Thank you for your input, I know of the factory option, but as far as I can see it was only ever an option on a new TD5, the aftermarket on the utilities I have not seen one for sale in a long time and usually have parts and wiring missing! As far as I can tell the TD5 does not have the same issue as the Puma with regards to the Rickover limit, I have sat holding my TD5 on higher revs for quite some time testing this very thing. I think I will make a start on this, not too complicated on the TD5 I’m hoping. Thanks again, Mike |
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26th Jan 2021 2:38pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2201 
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I had a think about this a little while ago for my own TD5. I believe that you could implement it fairly simply as a static raised rev point (rather than a variable hand throttle). It would simply require a switchover between the original throttle pedal and a fairly simple voltage divider set which provides the ECU with the three voltages corresponding to a chosen throttle position.
It shouldn't be too hard to implement a variable 'hand' throttle with a microcontroller and DACs though. Cheers, Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale |
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26th Jan 2021 3:01pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16927
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That would certainly make it much easier. I have always had a suspicion that the factory option included an ECU with different programming, but I have no evidence to support this. |
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26th Jan 2021 3:12pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10
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If you apply the throttle on a Puma and rather than hold a set revs you allow them to increase and fall slightly, does the ecu still override this?
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26th Jan 2021 3:27pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10
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Yes Steve I think this needs to be done with a Microcontroller, I have most of the parts in my kit so I will put together a prototype. |
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26th Jan 2021 3:31pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16927
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On my Defender at least it is hard to answer this question definitively. If you release the pedal and press it again, you can increase the revs until the next time the ECU shuts them down again. If you jiggle the pedal very slightly, for example increase the pressure as the revs autonomously drop off, you seem to get some very strange and totally unpredictable results with significant fluctuations. The "faulty pedal management strategy" is quite intrusive on the Puma. Another tiresome effect is that if you press the brake pedal whilst driving, ie you have both the throttle and brake pedals pressed, the ECU will again determine that you are trying to stop with a faulty throttle pedal. I can see the sense in this and have no doubt that it is normal for drive-by-wire throttles, but it's a nuisance if you're trying to dry your brakes. |
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26th Jan 2021 4:11pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10
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A brake drying override sounds like an entirely different project lol.
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26th Jan 2021 4:24pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6043 
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Keep us posted on you project for the Td5 high idle.... would be interested in a kit for mine
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27th Jan 2021 2:34pm |
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| A.Rubio Member Since: 04 Mar 2017 Location: Rocafort -Valencia Posts: 27 
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 Click image to enlarge Hello there is a mechanical way to make a hand throttle for the Td5 only for winch use or other occasions but never for use as a cruise control I put photos, this is done as if it were a change of bicycle sprockets and with the same elements. Or I leave some pictures Click image to enlarge Click image to enlarge Click image to enlarge |
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27th Jan 2021 7:57pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10
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, I will indeed, awaiting the arrival of the black ECU connectors so starting to get the coding started. |
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27th Jan 2021 11:11pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10
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Thank you for the pictures, I have heard of this method but never seen pictures before, so thank you very much. I really need a system that deactivates with either the Brake or Clutch being pressed as I'm not sure of the legalities without this. |
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27th Jan 2021 11:16pm |
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| TheLastMaverick Member Since: 16 Apr 2017 Location: Nottingham Posts: 10
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Can anyone please advise the voltage to the ECU from the Brake and Clutch switches, I'm assuming it's 12v but not totally sure.
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2nd Feb 2021 1:56pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Genius, I did something very similar in my 200tdi many years ago, worked a treat for winching. Simple ideas are often the most reliable   |
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2nd Feb 2021 4:24pm |
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