Sudden surging after downshifting - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
DL1000A - 2014-2016 DL1000A - 2014-2016 (L4-L6)

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post #1 of 17 Old 06-13-2018, 02:13 PM Thread Starter
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Sudden surging after downshifting

I hope I can get some help on this.

2014 Suzuki V Strom 1000 DL, ECU update and in Traction Control setting 1 (TC1)

I've noticed on downshifting my bike say, 5th down through the gears to either 2nd or first, combined with braking, that I sometimes get a bad surge of power, almost like the throttle is goosed. It's noticeable and concerning on a 90 degree turn, which is where I experience it. In a straight line, like stopping at a light, no problem. It's on a 90 degree turn, slowing down from 55+ mph with braking, downshifting, getting down to a safe speed (say 15-22 mph), and setting up for the turn that this brief surge kicks in. It throws me back in the seat.

I'd almost think it's software . . or I'm doing something that confuses it, or the ABS is interacting with traction control . . . local roads are clear, dry, hard pavement. And it's in the turn too. This would not be a good track day bike (I realize that track days are not its main purpose anyway, but you'd feel it acting up in those circumstances.)

Is it me (bad braking/downshifting technique), software, I'm in wrong traction setting . . . I will say, I don't probably always use both rear and front brakes prior to a 90 deg turn . . . mostly rear. Would that do it? I gotta get a handle on this issue.

Any thoughts?

Thanks.

Kevin
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post #2 of 17 Old 06-13-2018, 02:53 PM
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Check your throttle play adjustment. When you turn your bars from lock to lock does it cause an increase in rpm?

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post #3 of 17 Old 06-13-2018, 05:13 PM
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Quote:
Originally Posted by 2thDr View Post
Check your throttle play adjustment. When you turn your bars from lock to lock does it cause an increase in rpm?

...
Yes as above and also throttle cable routing; especially since you seem to notice it most on tight turns.

Another thing is if you have a throttle rocker and aren't used to it you might be hitting the rocker under braking.

..Tom

2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 195,000+ km, 121,000 miles.

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post #4 of 17 Old 06-13-2018, 05:14 PM
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Suzuki clutch assist system (SCAS) ??

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post #5 of 17 Old 06-13-2018, 06:12 PM
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Quote:
Originally Posted by Rolex View Post
Suzuki clutch assist system (SCAS) ??
Not on a 2014 DL1000.

..Tom

2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 195,000+ km, 121,000 miles.

This can help preventing from cars pulling out in front of you (SMIDSY)
SMIDSY detailed report.


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post #6 of 17 Old 06-13-2018, 06:29 PM
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So it is fine with TC off?

2014 Suzuki V-Strom 1000 ABS (Candy Daring Red)
2017 Kawasaki Versys-X 300 ABS (Graphite Grey)
2013 Suzuki V-Strom 650 ABS Adventure (sold)
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post #7 of 17 Old 06-13-2018, 10:34 PM Thread Starter
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Appreciate the comments. A few more datapoints:

The bike has 11.5K miles on it. I bought it used about 3 months ago. I've put about 1700 miles on it, so other than this issue, bike is running fine. I've mostly gotten the hang of it by now. I found the new ECU works great about 98% of the time.

Rear tire is a Bridgestone Trail Wing, probably about 2-3K miles left on it. The front is a Battle Wing.

I didn't think about checking if a cable issue. Don't think it's this as I've not sensed any binding when new full lock, but I'll double check.

Haven't tried another Traction Control setting. I run it in TC1 . . . is that what others use?

If I disconnect the battery cable for 30 seconds, will the ECU relearn settings or reboot itself?

I've noticed a similar surge on a BMW 1200GS while test riding it (worse though). An owner of another one confirmed his acts a bit more mildly but explained it as the FI responding in some way to a closed throttle (as one brakes/downshifts) and then all of a sudden, a brief surge once given throttle.
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post #8 of 17 Old 06-14-2018, 12:52 AM
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According to this the 2014 has SCAS.

https://motorbikewriter.com/suzuki-v...rcycle-review/

Some of the 19 rides in my shed
2014 V2, Snoopy
2009 Wee, Pumbaa the pig
WR450F, The Blue Postie Bike
YZ250N smoker with rego, Stinky.
Yamaha MT09 (FZ09), The Scud missile.
Club Lead not Club Med.
He with the most toys wins.
Out of my depth in a puddle.
Live life on the edge you will see more that way.
Ridding a motorcycle keeps things in balance.
At the end of each trail and at the end of each day history is made.
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post #9 of 17 Old 06-14-2018, 03:29 AM
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1) How long have you owned this bike? Buy it new?
2) Did it always do this?
3) You mentioned the ECU update--did it have this issue prior to the update?
4) Any mods on the bike pertinent to engine performance or control operation?
5) Any recent work done to the bike?

ABS and TC are inter-related in that both rely on the wheel speed sensors. The ECU uses this info for TC, the HMCU uses the info for ABS. The ABS is only activated during an ABS stop as the HMCU detects a difference in difference between front and rear wheel speeds under braking, just as the ECU activated TC as it detects a difference between front and rear wheel speeds under acceleration.

I leave my '14 DL1K is in TC1 at all times, to date ( Bought new/leftover 1/17) has never activated in what I consider normal street riding. Nor have I had the TC activate. Yet.
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post #10 of 17 Old 06-14-2018, 09:07 AM
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Quote:
Originally Posted by Rolex View Post
According to this the 2014 has SCAS.

https://motorbikewriter.com/suzuki-v...rcycle-review/
" Suzuki Clutch Assist System (SCAS) which is a slipper clutch for downshifts."

Yes.. when the poster above mentioned SCAS I thought they were talking about the Low RPM assist, the system that gives gas as you let out the clutch.

I can't see how the slipper clutch (SCAS) would have any effect on causing the engine to rev apart from the normal increase in revs that happen when you let out a clutch. (Which I doubt the OP is talking about.)

..Tom

2006 DL650: 202,000 km 125,500 miles, Sold
2012 DL650 139,500+ km, 86,700+ miles. Sold
2015 DL1000 New July 2015 195,000+ km, 121,000 miles.

This can help preventing from cars pulling out in front of you (SMIDSY)
SMIDSY detailed report.


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