Smaller front sprocket + Traction Control question - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 43 Old 08-02-2016, 01:01 AM Thread Starter
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Question Smaller front sprocket + Traction Control question

Looking for some serious knowledge here about how Traction Control works.

Last Saturday, we replaced my brother's V2 (2016) front sprocket from the stock 17 to a smaller 16 teeth. The bike feels smoother on low speeds, plus acceleration feels stronger. So far, we are happy with the results.
However, when the bike is set to Traction Control 2 (most sensitive setting) the TC light will turn on frequently, with the smallest of bump in a paved road.

Trying to explain this issue, I've considered this:
- Speed sensor is in the front wheel.
- The computer is always monitoring speed + RPM and current gear.

Let's say the bike with the OEM 17t sprocket in 2nd gear at 3000 RPM is supposed to move at 50 km/h. (example figures only).
With a smaller front sprocket, (16t) the engine must be at 3200 RPM to match the 50 km/h.
(The same would happen if you installed a smaller rear wheel)

My guess is that the computer might consider the higher RPM as a rear wheel spin and TC is activated.

Your thoughts will be very appreciated.

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post #2 of 43 Old 08-02-2016, 08:04 AM
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That is interesting? A couple of points tho, the TC monitors both front and rear wheel and compares them continuously. The computor knows which gear the bike is in based on revs vs speed (measured from both monitored wheels?) whereas in the previous model the speed was read from the gearbox output shaft.
So it might be struggling to be adaptive to the smaller sprocket?

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post #3 of 43 Old 08-02-2016, 09:28 AM
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I didn't notice any difference in TC on mine. 4000 km's done on 16t sprocket.

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post #4 of 43 Old 08-02-2016, 09:39 AM
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The explanation sound reasonable. And not to hijack, but what are the advantages of going smaller on the front sprocket on a 1000cc bike? Are you guys trying to get more top end out of it? Better fuel mileage? Just curious.

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post #5 of 43 Old 08-02-2016, 10:29 AM
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Quote:
Originally Posted by John V Strom, Jr. View Post
The explanation sound reasonable. And not to hijack, but what are the advantages of going smaller on the front sprocket on a 1000cc bike? Are you guys trying to get more top end out of it? Better fuel mileage? Just curious.
Going lower on the front lowers gearing. So, low speed maneuvering is the main advantage. Also, you get to make use of 6th gear more. Previously, the only time I got into 6th was when on the interstate. Now, I can cruise secondary highways at 60-65 mph in 6th.
There's no noticeable change in mpg unless you're frequently cruising at >85 mph, where you might see a slight decline.

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post #6 of 43 Old 08-02-2016, 11:54 AM
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The vid below is why I wanted lower gearing. Fast forward to 12:00 minutes. At 12:10, in the steep loose rocks with TC at 1, you can hear the motor cutting out. The TC was turned off soon after that. Several places thereafter, like at about 15:40, you can hear the engine rev up when the back wheel spins. Having TC on was a complete detriment when trying to climb up steep loose stuff.

I noticed the TC kick in more with the smaller front sprocket, particularly in mode 2. Then even more so after switching from stock tire to the Mitas E-07.


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post #7 of 43 Old 08-02-2016, 06:42 PM
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Originally Posted by mcrag View Post
Going lower on the front lowers gearing. So, low speed maneuvering is the main advantage. Also, you get to make use of 6th gear more. Previously, the only time I got into 6th was when on the interstate. Now, I can cruise secondary highways at 60-65 mph in 6th.
There's no noticeable change in mpg unless you're frequently cruising at >85 mph, where you might see a slight decline.
Wow,

I am forgetting simple things. I was thinking it was raising the gear ratio, hence my question. I even did this on my Triumph a few years ago and didn't remember that I went down a tooth, not up. Thanks.

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post #8 of 43 Old 08-02-2016, 11:21 PM Thread Starter
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Guys - guys - guys

Any other thought on the traction control issue?

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post #9 of 43 Old 08-02-2016, 11:27 PM
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There was a few people reporting similar things on the already existing thread about going down one tooth on the front sprocket.

Thread title is: " V2 + 16t = true love"

It is contrary to what I understand of how Traction Control but if that is what is happening I'd like to understand why Suzuki did it that way. It seems way too complicated and unnecessary.

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post #10 of 43 Old 08-03-2016, 04:06 AM
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Really obvious. Torque at the rear wheel is up ~6% and that's ripping the rear loose.

Fixes.
Gentler on the throttle.
Run a gear higher
Run at lower rpm
Find a tire that's at least 6% more grippy

There's nothing wrong with the TC, you are simply slipping more. I've ridden with GS's, KTM's DL 1000's on my 650, on anything like a decent surface the DL has better acceleration simply because it isn't continually spinning up the rear.
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