Cheapest 4 mph gain....?

[oldskool]

Do the Australian bikes have this much better performance than the US bikes. I know the epa standards hurt but this much. This fella is getting 108 KPH on a stock CT, 67mph....? Then by adding a simple home made windshield he was able to go 115, 71 mph. Is this possible

 

[quinnsd13]

That's awesome! I do get 2-3mph more when I try tucking behind my tiny windshield. Nothing like that though! I think with my weight and setup I've capped out at 58mph. Hitting 70 would be amazing as I'm surrounded by 55-70mph roads.

 

[m in sc]

id bet its just gearing changes and an inaccurate reading speedometer due to that.

 

[oldskool]

id bet its just gearing changes and an inaccurate reading speedometer due to that.

I don't know, he says the bike is stock except the little shield. He passed a truck in the video, something I've never done on the CT

 

[Clancy oto]

Hmmm I have a fairly stock Australian Ct. I’ll check with gps this week.


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[vintagegarage]

If you read his replies in his comment section, you will find that that video is just a clickbait joke he was making. You guys are pretty easy..

 

[m in sc]

i didn't bother watching the video. I usually don't watch most as they tend to drone on and on 0.02

 

[oldskool]

i didn't bother watching the video. I usually don't watch most as they tend to drone on and on 0.02

Actually was thinking about what you have said, the main issue holding the CT back on a little more speed is ecm, when I saw this. Quasimotard, a reputable fella, has had his Super Cub to 70+ MPH gps by only changing the front sprocket to 15T. So it seemed possible that the CTs down under might have a better ecm making it possible to pick up some speed.

 

[m in sc]

some early models use the old protocol ecms. they stopped that after the 1st year though.

 

[Clancy oto]

If you read his replies in his comment section, you will find that that video is just a clickbait joke he was making. You guys are pretty easy..

What is the clickbait/joke?


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[vintagegarage]

Oh good grief.. you guys must have been sitting in the back row in Physics class. Here is one of his quotes from his reply to a comment:
"I could check it with the GPS but that would spoil the fun.

But it does do the 80km an hour that is on most of our local roads easily and that is a lot better than the CT90 or CT110 ever did."

80km an hour is 50 mph...

 

[Clancy oto]

Ah got ya. Thanks.


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[Clancy oto]

some early models use the old protocol ecms. they stopped that after the 1st year though.

I’ll get back to you on that. I have a 2021 in Australia. See 111kph (67mph) on the speedometer but questionable accuracy. And probably a slight decline.
Best was an indicated 116kmh (72mph) on the way home from buying the bike. Again, probably on a slight downhill and not gps.
Full tuck. Stock as a rock back then.


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[FizzBuzz3000]

Considering that from the waist up, the body acts like a massive sail to the bike, as there is no aerodynamics to speak of. The windshield however is curved and can "break up" the wind as the bike is moving along, avoiding the body almost entirely. While I doubt the bike would go faster... I think it'd be a bit easier on the throttle. You'll get a bit better fuel economy than speed. This is just my opinion, I don't have any backing data for this.

 

[m in sc]

ive seen over 70 on a downhill before i did all the work to the bike.

 

[dmonkey]

Reducing drag can increase top speed, but I doubt adding *that* wind deflector would outperform simply making yourself small by tucking your head and torso.

Regarding emissions, the USA and Thailand have less strict motorcycle emissions requirements than Europe and countries that use the Euro standard such as Japan, but as far as I can tell Australian Design Rules don't yet have noxious emissions requirements for motorcycles. Correct me if I'm wrong there, but it makes sense considering Aussies get new road-legal 2-stroke Enduros.... Yeah, I'm jealous. Most ECMs have region specific part numbers which could enable a different tune for each region. I wouldn't be surprised if the Australian model does have a different tune and makes more power. I also wouldn't be surprised if the USA model has a tune that makes less power than the Japanese model even though Japan has stricter emissions... the USA sometimes gets hosed on vehicles like that.

 

[m in sc]

overcoming wind drag is a big deal w top speed for sure if your HP is lacking. I'll give this example: this is a 71 G3SS i built with a CR85 motor, which was a relatively stock motor that would put down 20 RWHP. (I did have it dynoed). It was just over 180 lbs wet, and even w the kreidler race fairing, tucked, it would just hit 80-81 mph w a 190-200 lb rider, flatland, AND SUSTAIN IT. power wasn't the issue, aero wasn't really an issue, that's just what the bike was able to overcome. it wasn't hitting the rev limiter in 6th gear either. Did the fairing help a bit? yes, but not much, it gained maybe 2-3 mph with it on vs off. (and it does have an on board gps speedometer)

 

[SneakyDingo]

On stock bike? Stock gearing and tires means 71 mph is close to 9000 RPM in 4th. Pretty sure the only way my bike is hitting 9000 RPM in 4th while going 71 mph is if I throttle lock it in WOT and throw it off a cliff (and probably not even then).

 

[m in sc]

^ exactly. never going to happen.

 

[oldskool]

Interesting laws in what is acceptable for a speedo error in Australia. The speedo cannot read under the actual speed at all. It can however read over the actual speed by as much as 10% plus 4km/h. So if the fella in the video's speedo is off by the maximum allowed his 115 KM/H would be 101/ 62 MPH and 108 would be 93KM/H/ ,58 MPH.......