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Author Topic: AT-DCT Suspension Tuning  (Read 952 times)

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Offline Leftless

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AT-DCT Suspension Tuning
« on: May 11, 2018, 04:32:10 pm »
So I spent a bit of time tuning my suspension.  It seems that the springs in the DCT are quite soft and cannot get the correct static or rider sag in the front and the rear.   The front seems to be worse, probably due to the extra weight of the gearbox.  I will run the bike like this for a bit, probably add some oil to the front forks, but will replace the front springs soon.

Below a tuning chart, I created (summary of a bigger doc) to help with the settings.  this is a work in progress.  this shows the factory settings as well as my current settings with the resulting sag measurements.





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Offline THROTTLE JOCKEY

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Re: AT-DCT Suspension Tuning
« Reply #1 on: May 11, 2018, 04:39:57 pm »
 :sip:
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Offline Leftless

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Re: AT-DCT Suspension Tuning
« Reply #2 on: May 12, 2018, 06:39:35 pm »
Went for a 300km run in and around Malmesbury and Piketberg.  I left the tyre pressure at 1.8 and 2.0 for the time being.  This helps with rocks that you inevitably find in the road.  There is a VAST improvement over the standard settings.

The front is still a bit soft and low leaving the rake angle very steep.  The only way to fix this is to replace the springs and will have to wait a bit.  in the meantime, ill be increasing the oil level 5mm. 

I also found that wider pegs will be on the immediate short list.  it is a bit difficult to balance or force wight on the narrow pegs. 

More testing next weekend.
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Offline DavidMorrisXp

Re: AT-DCT Suspension Tuning
« Reply #3 on: May 12, 2018, 07:48:45 pm »
cheers Leftless

Can you post the ABS/TC model settings
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Offline Leftless

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Re: AT-DCT Suspension Tuning
« Reply #4 on: May 13, 2018, 07:52:07 pm »
Just to reiterate, I generally do not commute with the AT, this is purely weekend riding.  Anything listed here is my personal preference.

When on tar I leave the ABS and TC settings at their default (moffie mode) as I do believe they add value on tar roads.  However, the dynamics of how a motorcycle behaves (steers, turns and brakes) on dirt is vastly different to tar.  On dirt ABS = OFF, TC = OFF.  The bike will NOT stop in the same distance on dirt with ABS ON.  I rely on the wheels to skid and slide on dirt - opposed to tar

This is a personal choice and specific to MY riding style.  In most cases, I would consider ABS = ON, on dirt to be irresponsible and dangerous!  I've been in ONE, and that was ONE too many incidents where I crested a blind hill on a high mountain pass at speed just to find a sharp turn and barely able to stop due to ABS thinking it a good plan to release the brakes as it thought I was skidding.  In fact, I was skidding, deliberately, cause that's how you stop a bike on dirt.    TC just does not make sense in the dirt - any time the system detects the two wheels turning at different speeds it removes power from the back - now try that in sand or a proper climb.   You'll just end up not going anywhere and in some cases where you think you want to "blip" over a bump, the TC just goes "nope" and you fall on your bum.

i
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Offline Kaboef

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Re: AT-DCT Suspension Tuning
« Reply #5 on: May 13, 2018, 09:04:15 pm »
Its good to hear from you again here

I fully agree on what you saud about Abs and tc

On dirt I need to be fully in control of the bike. No electronic stuff please.

I hope you get the suspension sorted.
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Offline Leftless

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Re: AT-DCT Suspension Tuning
« Reply #6 on: May 14, 2018, 07:49:54 am »
Thanks Kaboef, took a while but was inevitable   ;)

Yea.  The suspension is not that far out at the moment.  It's just annoying that I cannot set it the way I want it.  My assumption is that they have the same springs in both the manual and the DCT.  The DCT is around 10Kg heavier with all the wight right in front of the engine (clever gearbox) but they did not change the front springs to accommodate this.

Currently, the rear rider sag is 34% instead of 33% with the front at 36%.  these are both tuned to max preload.  The rear static sag 35mm (16%), that is spot-on.  The front static sag, on the other hand, is 60mm (26%).  In my opinion, this should be stiffened a bit.  These are all small variances and should not bother most riders.  I'm just picky. 

With the suspension set as it is currently, one could live with this if you have to.  It is a vast improvement over the stock settings.  I must admit it is hard and not great for town riding.  This is however great for moderate to bad gravel tracks.  If the front is stiffened up a bit more, it will be more better.
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Offline Grunder

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Re: AT-DCT Suspension Tuning
« Reply #7 on: May 14, 2018, 09:36:15 am »
 :sip:
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Offline Boerbok

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Re: AT-DCT Suspension Tuning
« Reply #8 on: May 15, 2018, 01:03:57 am »
Thanks Leftless, how much do you weigh all kitted up?
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Re: AT-DCT Suspension Tuning
« Reply #9 on: May 15, 2018, 06:03:48 am »
 

Offline Leftless

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Re: AT-DCT Suspension Tuning
« Reply #10 on: May 15, 2018, 07:45:44 pm »
That's open for discussion.  I would like to say 85kg but my wife seems to differ.  I also don't wear a size 28 jean either...  All my riding gear seem to have shrunk in the past 5 years.  It must be the heat in attack where I stored it.  Realistically I would need to guess around 100 to 105kgs all kit on.  We don't own a scale (my wife banned it from the house - bearer of bad news and all) so it's difficult to say - definitely not 85  :eek7:

You should do the measurements for rider sag.  This will give you the correct setting.   Setting the preload to an estimated weight is not that accurate as your riding position might differ from mine placing the moment of your mass different to mine.  Also, if you have an AT-D or AT-A will influence the shock loading.  Currently, both the front and rear preloads are set to max with the rebound and compression damping set to fairly slow both ends.

Then remember this is purely for solo off-road riding.  I even removed the rear pegs and would prefer to fit a narrow rally style one-piece seat, but all in due time. 

I picked up fork oil earlier and will be adding 5mm to the front and run that for a while to how this helps before replacing the front springs.



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Offline BlingKing

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Re: AT-DCT Suspension Tuning
« Reply #11 on: May 18, 2018, 09:36:48 am »
It is probably the best money you will spend on the AT judging by the feedback I have had from the customers I have helped.

Fit a set of WILBERS Progressive front fork springs - they are better weighted in nM strength and of course the progressive side of the springs take care of the high speed compression that causes handling head-aches such as corrugations in the road etc.
This coupled with the better grade fork oil and the corrected air gap will end the front end woes.
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Re: AT-DCT Suspension Tuning
« Reply #12 on: May 18, 2018, 09:40:49 am »
I did the Wilburs conversion, front and back, and am extremely happy with the way the bike handling has improved. Service from Blingking is also first class.
 

Offline Leftless

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Re: AT-DCT Suspension Tuning
« Reply #13 on: June 03, 2018, 08:56:26 pm »
Thanks, will definitely keep that in mind.  For now, I will need to live with what I have.  I'll look for a distributor in Cape Town. Rivonia is a bit far :)

One's ability lies in what you let yourself to believe is possible, and not the perceived limitations your body might have.

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