[Juls]

I assume we are talking speeds with the 10% speedo error corrected.

 

[estallings15]

I assume we are talking speeds with the 10% speedo error corrected.

10%? My stock speedo was dead nuts.

 

[Strokd_GE]

10%? My stock speedo was dead nuts.

When mine was stock the speedo was also perfect, it would show +1mph over the GPS at the most

 

[Pigman]

I assume we are talking speeds with the 10% speedo error corrected.

Mine are on GPS......no spedo

 

[Old Goat Ninja]

I assume we are talking speeds with the 10% speedo error corrected.

Not sure why you would assume that. Have you checked yours to GPS? I've never had a stock bike with stock gearing be that much off, however I did expect 5-7% off, so I recently did a top speed run with GPS just so I'd know since I'm always writing (indicated) after my top speed posts. I was less than 2% off on mine stock speedo with stock gearing.

 

[Soccerstud_2009]

Any risk of damaging the engine when running the dcr cam at 9600 rpm?

 

[hootie233]

I have hit the rev limiter and can hit 72mph. Kitaco, dcr cam, intake, exhaust, EjK tuner. I have been considering a wind screen to help on aero. I KNOW this is a huge factor because if I ride with my jacket unzipped my bike is significantly slower.

 

[Juls]

Not sure why you would assume that. Have you checked yours to GPS? I've never had a stock bike with stock gearing be that much off, however I did expect 5-7% off, so I recently did a top speed run with GPS just so I'd know since I'm always writing (indicated) after my top speed posts. I was less than 2% off on mine stock speedo with stock gearing.

My SF is 10% off according to the GPS unit, and the GPS Speed app on my phone.
Stock gearing I have not adjusted it, it is in KM/H thought not MPH but really that should make no difference.

 

[Reeny]

The UK and European speedometers are 9-10% optimistic.
The US speedos appear to be more accurate.

A 16t front sprocket and 140 rear tyre was enough to correct my 10% error.

 

[MSX UD ITA]

When mine was stock the speedo was also perfect, it would show +1mph over the GPS at the most

My 2015 Reads speed correctly

Approx 115 kmph without longer transmission gears

 

[MSX UD ITA]

The UK and European speedometers are 9-10% optimistic.
The US speedos appear to be more accurate.

A 16t front sprocket and 140 rear tyre was enough to correct my 10% error.

No.



Im any case, uk uses same us measuiring unit so.. Maybe old groms has shitty speedos.

Its same Engine!

 

[keit29]

No.



Im any case, uk uses same us measuiring unit so.. Maybe old groms has shitty speedos.

Its same Engine!

No. This has been discussed many times. Euro spec speedos are very optimistic. They read about 5-7 mph too high. They do this so that Honda does not got dinged by the Euro governments that have strict laws about accurate speedometers. If they are found to read lower than the actual speed, they can get in trouble. So to prevent this they just make them read a little higher so they have a safety net. The US does not have such a strict law, so they don't add the speed "cushion" and actually read much more accurate. If you don't believe me, get a GPS and take a pic of it next to you Euro speedo.

 

[keit29]

My 2015 Reads speed correctly

Approx 115 kmph without longer transmission gears

At what rpm and gearing. Simple math will tell you the truth.

 

[Strokd_GE]

Keit is accurate about the speedo reading over on euro bikes. A lot of UK guys post "intake and exhaust only, my bike does 80mph now" when in reality it's only 73 or so

Im not sure if ALL euro bikes read over but some certainly do. Easiest way to tell of course is to GPS yourself

 

[Reeny]

This is after the 16t front and 140/70 Metzeller rear tyre had been fitted.
Gear commander calculates those changes to be a 9% difference.
GPS v speedo readings are spot on now (+ or - 1mph).

 

[MSX UD ITA]

115 kmph stock gearing

At what rpm and gearing. Simple math will tell you the truth.

lol guess !!!!


at fucking max !

 

[m in sc]

with my own stuff I always wait at least 15-20 seconds at a maintained constant speed on both to verify due to refresh rate. otherwise it can be misleading. just my .02

 

[MSX UD ITA]

yeah but all the other factors (air, asphalt grain, tyre pressure) are not constant so any test is technically irrelevant (metrology lab here)

squeezing 77 mph with stock gearing means that engine revolutions are over the red line and this will just rape the engine

I used a physical wind shield to reduce any air friction (zx10r at 2 meters in front of me while running) and at 120 kmph (approx 75 mph) the engine is clearly start to scream for excessive rotations (stock gearing)

so I'm pretty confused about the "5-7 mph difference" that means i should do read 130 kmph... I'm sincerely not intended to push my beloved bike at that insane speed '^^

 

[m in sc]

He has 500+ on the rev extend. Will bounce off limiter at 74 stock gearing/redline with a 140 rear tire.

 

[Soccerstud_2009]

Still curious if there are any risk of running the dcr cam at 9600 rpm. I know crower says he made it to work with the stock rev limit of 9100.