Speed difference from Gen 1 to Gen 2

[raven6116]

Hi All,
I have a general question: On my Gen 1 I would get 20MPH / 1000 rpm so at 3000rpm I got 60MPH and 4000rpm produced 80MPH. On my new 2022 I only get 70MPH @ 4000rpm. Is this something you've noticed too? The new bike is Californian the old bike was not, so I', wondering if the California Canister is having an effect. I'll get the canister off and reflash the bike as soon as I can, but I'm curious if there is a difference Gen1 - Gen 2

thanks in advance, Be safe

 

[Sierra1]

. . . . On my new 2022 I only get 70MPH @ 4000rpm. . . .

My '17 does about 73mph at 4k. Some days it's 3900, some days it's 4k. 74mph is always 4k. Since I've noticed this while on cruise, I've assumed that it has to do with environmental conditions. Like if I have a tail wind, are the rpms lower than if I have a headwind? Slight grade up or down?

But yes, other have noted that the Gen 1 speedo is not as accurate as the Gen 2. I wouldn't worry about it though.

 

[raven6116]

Thanks @Sierra1.

 

[Boris]

I agree that speedo error between gen models likely play a part. Mine shows a little under 80mph at 4K, however I know from two sat navs that it’s about 5-6 mph optimistic.

 

[Sierra1]

I agree that speedo error between gen models likely play a part. Mine shows a little under 80mph at 4K, however I know from two sat navs that it’s about 5-6 mph optimistic.

Which mine, for whatever reason(s), is pretty much right on? See? The one perfect Super Tenere.

 

[gapmtn1]

On my Gen 1 I would get 20MPH / 1000 rpm so at 3000rpm I got 60MPH and 4000rpm produced 80MPH. On my new 2022 I only get 70MPH @ 4000rpm. Is this something you've noticed too? The new bike is Californian the old bike was not, so I', wondering if the California Canister is having an effect. I'll get the canister off and reflash the bike as soon as I can

Aside from a slipping clutch, the only thing that would affect these numbers is gearing. No canister version or reflash will change what speed your bike travels at for a given RPM.

Edit: Tire size (actual circumference) will also change speed:RPM ratio.

 

[magic]

Aside from a slipping clutch, the only thing that would affect these numbers is gearing. No canister version or reflash will change what speed your bike travels at for a given RPM.

Edit: Tire size (actual circumference) will also change speed:RPM ratio.

Also hills or wind will not affect speed at a given rpm.

 

[Jlq1969]

Tire size (actual circumference) will also change speed:RPM ratio.

The tire diameter affects the RPM/true speed (GPS) relationship……but he refers to the RPM/speedometer relationship…..that is not affected by the diameter of the tire

 

[gapmtn1]

The tire diameter affects the RPM/true speed (GPS) relationship……but he refers to the RPM/speedometer relationship…..that is not affected by the diameter of the tire

Raven never mentions speedometer. Nor did I.
But thanks.

 

[Sierra1]

Also hills or wind will not affect speed at a given rpm.

I will respectfully have to disagree with that. I can't prove/show it on paper, but I know what I see my bike doing. It a very small amount, and there's no way to know how many rpms different because each tick is 100rpms. But, on cruise, my tach will change from 3,900 - 4,000rpm depending on grade and wind. Speed might change by 1mph, or not.

 

[gapmtn1]

Also hills or wind will not affect speed at a given rpm.

I will respectfully have to disagree with that.

With a properly working standard manual transmission and clutch, no tire slippage, etc.... this is just not true. There is no slop in the system. This is not your cage with automatic transmission and torque converter. Hard unforgiving manual transmission gears aren't going to flex and give with hills. The shaft drive (same is true for chain drive), u-joints, splines, even the black rubber blocks in your wheels aren't going to allow the loss or gain of speed at a given RPM. It's a mathematical consistency. With your history, Sierra, you should know that.

My '17 does about 73mph at 4k. Some days it's 3900, some days it's 4k

Now, Sierra, you do bring up the gauges. I suggest that the differences you see are a result of the limits of the gauges' accuracy. As you mention, the tachometer display is accurate +- 100 RPMs. The speedometer display is accurate +- 1 MPH. Assuming the speedometer does normal rounding, perhaps on an incline you go from 73.4 MPH (73 indicated) and 4000 RPMs down to 72.5 MPH (still 73 indicated) and this brings the revs down enough for the tachometer to visually tick down to 3900. Same displayed speed but different RPMs. Mechanically your speed:RPM ratio will (and must) stay the same, but the gauges are telling partial truths.

I have yet to own a Japanese with an accurate speedometer; using them for comparisons sake is pointless. I wouldn't really put a ton of stock in the tachometer, either, if I were a real tuner.

 

[Sierra1]

Yup, that's what I said.