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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Sat Oct 04, 2014 12:48 pm 
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Joined: Sun Nov 24, 2013 9:47 pm
Posts: 75
Location: Oakland, California
SanDiego wrote:
Congratulations on installing the Avid Ascends. We now have 7,000 miles on the ones we installed on the front. Every time I throw the Spark around a tight corner or freeway ramp, I smile :D and thank them.


I'm due for the first rotation, so instead of that, I'll replace the fronts with the Avid Ascends. Can you please post the exact model name and number as there seem to be a couple of flavors of Ascend that could fit. Thanks!

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If simplicity worked, the world would be overrun with insects
-----
2016 White Spark EV with DCFC (used to have 2014 Spark EV)


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Sun Oct 05, 2014 1:16 am 
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Joined: Sun Aug 11, 2013 4:36 pm
Posts: 40
Quote:
I'm due for the first rotation, so instead of that, I'll replace the fronts with the Avid Ascends. Can you please post the exact model name and number as there seem to be a couple of flavors of Ascend that could fit. Thanks!

The tires we installed are "Yokohama Avid Ascend 185/55R15 82V" (V is the speed rating = 149 mph).

Base cost was $109 each from Discount Tire. I had to special-order them through the local store, and they wanted payment when I ordered them.

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2014 Spark EV 2LT - leased on July 24, 2013


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Wed Aug 23, 2017 10:40 am 
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Joined: Wed Aug 23, 2017 10:10 am
Posts: 7
Bump!

HI! So, I have a 2015 spark EV, and the stock front tires are BALD at 25,000 miles.
I gather I might be a record holder for getting this far with them.

Having read a lot of threads on this fine site, I decided to do some experimentation.
I pulled the left front wheel,and unscrewed the mounting screw for the ABS sensor.
I tied it back, replaced the wheel, and went for a drive. Well, this was a mistake. :oops:

It reduced propulsion power, and threw a bunch of codes. Now that I've reinstalled the sensor, the codes remain.
I have "reduced power" plus no regen, and no cruise control.

I was going to wire the rear sensors to the front, but now there's no point until I figure out how to read out and reset the codes.
I'm due in the tire store tomorrow for a new set of 195-50 s-drive on the front, but I was hoping to burn these stockers ( they deserve it ) a little before that.

Any advice? Can I reset the code(s) or do I need to take it to the stealer? I was hoping to get a bluetooth ODB/CAN dongle anyway, might be time to pull that trigger and display interesting stuff on my iPad.

Thanks!
Chris


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Wed Aug 23, 2017 8:38 pm 
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Joined: Tue Mar 31, 2015 12:05 pm
Posts: 37
Try this: With the car off pull the negative off the 12v for a few minutes.


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Thu Aug 24, 2017 2:02 pm 
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Joined: Mon Aug 15, 2016 3:27 pm
Posts: 65
beez wrote:
Bump!

HI! So, I have a 2015 spark EV, and the stock front tires are BALD at 25,000 miles.
I gather I might be a record holder for getting this far with them.


I don't know about that, I'm over 25k and have quite a bit of tire left until the tread wear bars.


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Thu Aug 24, 2017 8:34 pm 
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Joined: Wed Aug 23, 2017 10:10 am
Posts: 7
Follow up: on my second drive after the test, the car returned all functions to normal, except the yellow car with exclamation point icon was still illuminated. On the third drive that went away too. So all is back to normal. I assume there may still be stored codes. I got exactly 25000 miles from the stock tires. I'm not an autocrosser but I do enjoy some sporty driving from time to time. This car is way too fun not to flog. :mrgreen:

Today I got new front tires, Yokohama s drive 195 50 15. They transform the car! Can use instantaneous full pedal from stock with no chirping, no torque steer (smooth pavement) , and no electronic nanny intervention!

I still have the stockers with tons of tread on the back. Please don't tell me some hogwash about how I'm going to die from oversteer. :lol:

I'm still looking for a wireless odb-can dongle and software. Recommendations?

Peace!
Chris


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Thu Aug 31, 2017 8:42 am 
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Joined: Fri May 01, 2015 5:52 am
Posts: 1096
Location: KC,MO
beez wrote:
...
Today I got new front tires, Yokohama s drive 195 50 15. They transform the car! ..., and no electronic nanny intervention!

I still have the stockers with tons of tread on the back. Please don't tell me some hogwash about how I'm going to die from oversteer. :lol:

....

I agree! I believe you can mix and match tires on this car and be fine.
Only I think it is Because the 'nanny' Stab Control is saving your bacon if you do start to get sideways,,, and you don't even know it. :!:

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Used '14 2LT w/ DCFC.
+56k miles.


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Tue Sep 05, 2017 12:33 pm 
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Joined: Wed Aug 23, 2017 10:10 am
Posts: 7
That could be true. With the rears still on, the stab control still gets active in strange situations.
It's really weird, sometimes i'm pulling about 0.01g lateral and it starts pumping a brake...

Other times I can be attempting to slide it around an on ramp and it does nothing.
Even the same ramp at different speeds, it usually is most obvious for intervening when there's truly nothing happening.

Korean software? :ugeek:


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Fri Sep 08, 2017 1:24 am 
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Joined: Wed May 29, 2013 12:00 am
Posts: 536
Location: Portland, OR
The software for the stability control and braking system was developed in the US. That has nothing to do with this, but just FYI.

TLDR: There should be a way to disable the ESC because a human is better than a machine at detecting what is going on with the shitty rear suspension on the Spark EV. Unfortunately, there isn't.

The "inconsistency" you're perceiving is actually just because you're not perceiving all of the tiny details. The stability control is most invasive when one of the rear wheels lifts and any braking (at all) is applied. With the beam rear axle and relatively soft springs, it's quite easy to lift the inside rear tire during cornering, especially if there is any uneven pavement. That's normal behavior for a beam rear axle. Also, if any braking at all is applied while the wheel is up or extremely lightly loaded, then the wheel will stop. My hypothesis is that this extreme deceleration of the wheel is seen as safety-relevant, because the car doesn't know if that is caused by a lifted axle or by an icy patch or gravel in the road. As a result, the car cuts power, puts the stability control into effect to help keep the car on course, and nannies are in full effect.

The result is that some corners that seem minor might cause the ESC to go off if you have a small dip in the road. If the road is smooth or you're at a low speed, the system will seem much less invasive.

Bryce


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 Post subject: Re: Stabilitrak seems over-sensitive? Any way to disable?
PostPosted: Mon Sep 10, 2018 9:59 am 
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Joined: Wed Jan 10, 2018 1:51 pm
Posts: 1
Nashco wrote:
The software for the stability control and braking system was developed in the US. That has nothing to do with this, but just FYI.

TLDR: There should be a way to disable the ESC because a human is better than a machine at detecting what is going on with the shitty rear suspension on the Spark EV. Unfortunately, there isn't.

The "inconsistency" you're perceiving is actually just because you're not perceiving all of the tiny details. The stability control is most invasive when one of the rear wheels lifts and any braking (at all) is applied. With the beam rear axle and relatively soft springs, it's quite easy to lift the inside rear tire during cornering, especially if there is any uneven pavement. That's normal behavior for a beam rear axle. Also, if any braking at all is applied while the wheel is up or extremely lightly loaded, then the wheel will stop. My hypothesis is that this extreme deceleration of the wheel is seen as safety-relevant, because the car doesn't know if that is caused by a lifted axle or by an icy patch or gravel in the road. As a result, the car cuts power, puts the stability control into effect to help keep the car on course, and nannies are in full effect.

The result is that some corners that seem minor might cause the ESC to go off if you have a small dip in the road. If the road is smooth or you're at a low speed, the system will seem much less invasive.

Bryce


To all you thinkers and tinkerers out there: would driving the signal for the rear wheel speed sensor with the front wheel speed sensor adequately fake out the Stabilitrack? What would you lose in the process? ABS?


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