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  #1213  
Old 01-20-2015, 04:25 PM
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Re: The Towing thread

Quote:
Originally Posted by HorseyGirlsMum View Post
I've been towing about 2250Kg Horse and float in Sports mode. I've found the braking etc smoother with it. Any views on whether to or not to use it in Sports? Thanks. HGM.
HGM,

Sports mode may alter the percentage of drive difference between the front and back wheels. But I'm not sure whether that is correct. Just putting it here hoping that someones with the facts will reply.

nrb1748

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  #1214  
Old 01-20-2015, 10:17 PM
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Re: The Towing thread

Quote:
Originally Posted by nrb1748 View Post
HGM,

Sports mode may alter the percentage of drive difference between the front and back wheels. But I'm not sure whether that is correct. Just putting it here hoping that someones with the facts will reply.

nrb1748
I don't know about braking but steering is better in Sport mode. In Auto mode the Jeep steers like any fourbie, drifting at speed. In Sport mode most of the drive goes to the rear so it feels more like a RWD sedan with lighter and more precise steering.
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  #1215  
Old 01-20-2015, 10:28 PM
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Re: The Towing thread

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Originally Posted by Sandjones View Post
Jeep GC WK2 in to service due to flat battery (4th Time needed Jeep assist) Service recently fitted new engine management module which they claim has been responsible for some electrical issues. Appears they are looking at battery drain overnight form an after market add on such as brake controller or replacement towing mirrors. Say that the engine management system is looking to shut down but can't and therefore draining the battery (my terminology) Anyone experienced dead flat battery when trying to start and whether or not related to an after market electronic product?
I've had no problem at all with the Tekonsha P3 even after left parked for about a week. Check the wiring! I've seen some after market wiring so sloppy that it was just a matter of time before the insulation wore through and shorted. Some sparkies don't give a damn provided the item works when handed over.
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  #1216  
Old 01-20-2015, 11:39 PM
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Re: The Towing thread

Re the P3. Same experiences as BobT.
I have left the GC standing for close to a month, without any battery issues.
Why not remove a battery terminal lead and connect a multimeter to see if any current is flowing? Connect the meter leads before disconnecting, so as to avoid a reset. i.e. connect the leads to the terminal base and the connector, slowly dislodge the terminal lead while maintaining the multimeter leads to maintain the circuit.
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  #1217  
Old 01-21-2015, 08:31 AM
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Re: The Towing thread

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Originally Posted by 67HR View Post
I had a HR unit fitted just before Xmas, I'll do some pics in the morning,

But prob looks like Snukes. i notice he has some edge trim around the cutout, nice touch.
As promised
Exterior view looks identical to Snukes so didn't post.
Only issue I dont like is electrical plug hangs lower than I'd like.

Hope it helps.
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  #1218  
Old 01-21-2015, 06:13 PM
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Re: The Towing thread

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Originally Posted by 67HR View Post
As promised
Exterior view looks identical to Snukes so didn't post.
Only issue I dont like is electrical plug hangs lower than I'd like.

Hope it helps.
Nice pics. So so clean!
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  #1219  
Old 01-21-2015, 07:28 PM
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Re: The Towing thread

Quote:
Originally Posted by HorseyGirlsMum View Post
I've been towing about 2250Kg Horse and float in Sports mode. I've found the braking etc smoother with it. Any views on whether to or not to use it in Sports? Thanks. HGM.
Hi HGM,

I too have been employing the same 'technique/method' as you, by towing in Sport mode.

I offer the following info with respect to the use of Sport mode whilst towing. This information only applies if you have an Overland spec vehicle or have had air suspension (Quadralift) optioned on your vehicle.
  1. In Sport mode the air suspension will lower the car to Aero height (lowers vehicle by 13mm) irrespective of the vehicle speed.
    • This will have some influence on the 'action/effort' of the Weight Distribution Hitch (WDH) if you are using one. [I note that you state that you're towing 2250Kg, which is right on the limit (2268Kg) that Jeep recommends the use of a WDH.]
    • If you are using a WDH, then you may want to set it up with this in mind.
  2. The transmission shift points will change to points higher in the rev range than when in normal.
    • That is, the engine will rev higher (hold the lower gear longer) before changing up to the next higher gear when accelerating, and conversely will change into a lower gear earlier when decelerating.
    • This will lesson the load on the engine when accelerating and increase the effect of engine braking when decelerating. An outcome which you have already noted.
  3. This one I'm not sure about, it may only apply to V8/SRT vehicle specs. The use of Sport mode may also alter the function of the Electronic Stability Control (Traction Control System [TCS] part only) by apportioning more engine power to the rear wheels and also allowing more wheel (rear only?) spin before limiting engine power to stop the spinning wheel.
    • I believe you have a 3.0 diesel (like me) so this does not probably apply.
    • This is important to note though, as the functionality I describe above (allowing more wheel spin before TCS intervention, not the apportioning of power part) can also be invoked by partially turning off ESC (by use of the ESC button located in the centre console, on the lowest row of switches). This can be useful when a little bit of wheel spin is beneficial, like sand driving or starting off in snow or on gravel (perhaps with a horse-float on the back in a wet grassy paddock?)
I provide this info to inform but not to offer a recommendation. I think people can make up there own minds as they are best positioned to know what is right for them given their own circumstances. (I'm not a lawyer, just don't want to ill advise someone when I don't have all the facts/expertise)

Hope this post is beneficial.

Gr8Ness.
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  #1220  
Old 01-23-2015, 03:17 AM
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Re: The Towing thread

Quote:
Originally Posted by Gr8Ness View Post
2. The transmission shift points will change to points higher in the rev range than when in normal.
  • That is, the engine will rev higher (hold the lower gear longer) before changing up to the next higher gear when accelerating, and conversely will change into a lower gear earlier when decelerating.
  • This will lesson the load on the engine when accelerating and increase the effect of engine braking when decelerating. An outcome which you have already noted.
Gr8Ness,
I'm not sure your point #2 is accurate at least not for 2011-2013 JGC's. It is true that shift points change instantly when selecting the sporty mode of other makes particularly older cars. However, I haven't seen this specifically mentioned anywhere in the Jeep literature. I had expected sport mode to change the shift points but was unable to feel any change other than in the handling. However, having said that, the Jeep has an adaptive box, that is to say, the gearbox learns the driving style and gradually adapts the sift points and shift rates to suite. So driving briskly will gradually give quicker and lower shifts regardless of the mode selected. Likewise when going from normal diving to towing, the gearbox senses the additional load and gradually adjusts accordingly without the diver switching anything. You will have noticed that when first starting to tow, the gearbox feels clunky but after about 10km that goes away and the car feels quite normal albeit heavier. So I suspect that regardless of the mode, as the box adapts, the gearing will become the same. So there really isn't any benefit in using sport mode when towing other than it might give a better steering feel.

Quote:
Originally Posted by nrb1748 View Post
HGM,

Sports mode may alter the percentage of drive difference between the front and back wheels. But I'm not sure whether that is correct. Just putting it here hoping that someones with the facts will reply.

nrb1748
See http://www.wk2jeeps.com/wk2_selec-terrain.htm . Auto mode provides a front/rear torque split of 40/60 whereas in sport mode it is 20/80 to give that rear wheel drive sedan feel.
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  #1221  
Old 01-23-2015, 06:20 PM
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Re: The Towing thread

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Originally Posted by BobT View Post
Gr8Ness,
I'm not sure your point #2 is accurate at least not for 2011-2013 JGC's.(Sorry, I should have alerted readers to the fact that I was talking about the 8 speed transmission) It is true that shift points change instantly when selecting the sporty mode of other makes particularly older cars. However, I haven't seen this specifically mentioned anywhere in the Jeep literature. (Since reading your post BobT, I have pulled out my Owners Manual [MY14 only]. Page 208, under the Sport heading: Quote .."This mode alters the transmission's automatic shift schedule for sportier driving. Upshift speeds are increased to make full use of available engine power" End quote.) It goes on to say the Quadralift fitted vehicles adapt the Aero height) I had expected sport mode to change the shift points but was unable to feel any change other than in the handling. However, having said that, the Jeep has an adaptive box, that is to say, the gearbox learns the driving style and gradually adapts the sift points and shift rates to suite. (Whether attributable to adaptive shift learning or not I cannot say, but I can definitely attest that my car upshifts later/higher in the rev range when in Sport. How much later/higher is related to how, uhm, 'assertive' I am on the throttle. I proved this this morning (NOT towing). So driving briskly will gradually give quicker and lower shifts regardless of the mode selected. Likewise when going from normal diving to towing, the gearbox senses the additional load and gradually adjusts accordingly without the diver switching anything. You will have noticed that when first starting to tow, the gearbox feels clunky but after about 10km that goes away and the car feels quite normal albeit heavier. (No, I have not noticed this. Either because I wasn't paying attention, or it does not apply to the 8 speed) So I suspect that regardless of the mode, as the box adapts, the gearing will become the same. So there really isn't any benefit in using sport mode when towing other than it might give a better steering feel. (As to steering feel, no, I have not noticed this. Again, probably because I wasn't paying attention)


See Jeep Grand Cherokee WK2 - Selec-Terrain . Auto mode provides a front/rear torque split of 40/60 whereas in sport mode it is 20/80 to give that rear wheel drive sedan feel. (Thanks for finding this reference, which confirms point 3 in my original post, does apply to the diesel. That is, more power to rear wheels and a less aggressive Traction Control System intervention for spinning wheels.)
Thanks for your post BobT. I apologise for not making it clear that I was referring to the 8 speed only in my post.

Gr8Ness
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  #1222  
Old 01-23-2015, 09:31 PM
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Re: The Towing thread

I just did a very simple test in my my14 diesel overland. Full throttle from stopped gives change up points for the first couple of up shifts (80k zone) at about 3800 rpm in "normal Eco" mode. In sport mode, exactly the same - 3800 rpm up shift points.
Russell
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  #1223  
Old 03-02-2015, 12:28 AM
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Re: The Towing thread

Is there any DIY in here for a towbar install?
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  #1224  
Old 03-02-2015, 02:05 AM
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Re: The Towing thread

The document which accompanies the towbar isn't bad from a mechanical perspective, though there is an obvious error regarding the position of the fish plates. If you don't pick it up, maybe you need a hand.

https://www.dropbox.com/s/39m5kg3q7d...0MY13.pdf?dl=0

I have done a reasonably detailed wiring "how to".

MY14 DIY Trailer Socket Wiring

Cheers,
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