Ninja H2 SX Top Speed

[DeRox]

Maybe they have limited it at 250kmh (156mph)? Hope not. Means I've got to spend more to remove the limiters

[cOoTeR]

Maybe they have limited it at 250kmh (156mph)? Hope not. Means I've got to spend more to remove the limiters

The pic I posted looks like 161 and the one jonthechon posted looks like 153. I don't know for sure but I hope there's something off with the imagery and the actual speed is actually faster.

[JonTheChron]

Looks to be around 10,500 on the tach if you look at the spacing distance between say 7 to 8 and 9 to 10K RPM.

The tach is only in even numbers after 4k rpms. 10,500 would be just barely above it.

I'm really puzzeled myself.. I wish one of us would of have snatched the Original video..

One frame I got looks like 153 and the other looks like 163, I also caught your 161mph frame.. which was only a few milliseconds away from mine. I'm sure this is 163mph, but then again it's hard to tell..

[JonTheChron]

Image

That one looks even worse. 153 and at about 11k rpms with it at full throttle.

I reviewed the video and I can tell you that the frame I took (the one that looks like 153) is only about 150ms away fro m the frame that looks like 161.. and if I follow the sound of the engine in the video.. I really would think that the speed is actually 163mph @ 10800 rmp

[Kubasaki]

Horse crap 150 I bet I can get it to 200+ once Brock's Does his magic and Re flashes my Ecu and full exhaust I'll do a video show what it really can do. Better beat my zx10R cause I'm pushing 190'S with 204 Hp

[Ninja H2SX]

Horse crap 150 I bet I can get it to 200+ once Brock's Does his magic and Re flashes my Ecu and full exhaust I'll do a video show what it really can do. Better beat my zx10R cause I'm pushing 190'S with 204 Hp

The drag coefficient will be a bit higher on the SX due to a bigger faring and windshield, so will take more HP to achieve the same top end than if it was a more "aerodynamic bike. HP required is a cubic function of speed, so to go from say 195 to 200 MPH takes a lot of added HP.

[Ninja H2SX]

Could be enough lag in the speedo that when accelerating hard the tach and speedo don't keep up with each other very well. Would have to get a snip-it from a video where someone is cruising at a pretty steady speed to get a good read on the tach and speedo to compare to the gearing spreadsheet.

The gearing spreadsheet is going to be pretty accurate IMO since it's all based on the mechanicals involved between crankshaft and rear wheel. Only variable in the spreadsheet is the circumference of the rear tire if based solely on the size of the tire. Best way to do it more accurately is to measure the actual rolling circumference of the rear tire and use that number in the spreadsheet.

[Ninja H2SX]

So here's my investigation results. This snapshot was from the Kawasaki ride in the mountains video. Speed is in Km/h.

3rd gear at 6,000 RPM (blurry, but 6K based on speedo markings posted earlier) shows 97 Km/h, which is equal to 60.3 MPH.

The spreadsheet shows 60.9 MPH in 3rd gear at 6,000 RPM. So to me looks like the spreadsheet is pretty accurate.

[UFO]

Could be enough lag in the speedo that when accelerating hard the tach and speedo don't keep up with each other very well.

Yep, think there's a definite hysteresis, maybe not between the speedo and tach, but just with the sampling rate(s) involved. The speedo updates at a certain frequency, and if you are accelerating hard it will just skip numbers. Watch the official video starting at 59s. As he's accelerating the speedo is jumping 4-5 kph at a time. You probably won't see a true speed unless you are at steady RPM/throttle for a second or two.

And trying to correlate a blurry video with a bike under hard acceleration to gearing calculation is probably not very accurate.

[Ninja H2SX]

I think the speedo has an actual needle (not a LCD needle graphics, but still electronically controlled), so I'd think the tach is more responsive than the digital speedo depending on the update frequency of the speedo. So yeah, the tach probably "outruns" the speedo when the bike is accelerating really hard.