black shark
Parking Attendant
Posts: 8
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posted June 02, 2008 03:21 AM
GPS Speed vs Rpm measurements on my stock ZZR 1400. Check the big error !!!
4500 rpm = 139@Speedo = 131@GPS 6,1% Error
9000 rpm = 275@Speedo = 253@GPS 8,7% Error
10400 rpm >300@Speedo = 295@GPS
10550 rpm >300@Speedo = 300@GPS 9,6% Error ?!?
I set the shift light to 10.600rpm and it never came on in 6th.
The Ratio RPM vs Speedo is constant, and they both diverge from the real values at the same rate.
The error at high Rpm/Speed is enormous, close to 10% at max engine speed ! So the actual engine RPM at 300km/h is about 9600rpm.
I've never seen such a big tachometer optimism in any of the bikes I had before, nor in the hudred cars I modified so far ! Is this typical from Kawasaki bikes ?
Keep it flying !
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Bye bye K1200, Hello ZZR 1400 :-)
  
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BobC
Pro
Posts: 1736
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posted June 02, 2008 04:54 AM
 Edited By: BobC on 2 Jun 2008 06:49
Have you noticed that while both the Speedo and Tacho are optimistic by several percent the ECU's 300km/h (186mph) 6th gear speed limiter is spot on when the speed is accurately measured with GPS or speed trap?
What I'm getting at is that they obviously can measure the speed accurately but the dashboard instruments are calibrated with a big optimistic error.
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Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles
2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)
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davej
Expert Class
Posts: 451
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posted June 02, 2008 05:28 AM
Ran up to 10500 in 6th, speedo was buried, figured had to be some error. motor was trying to wimp out or bog. Will remap this week on the dyno.
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Triumph guy
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BobC
Pro
Posts: 1736
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posted June 02, 2008 05:52 AM
quote:
Ran up to 10500 in 6th, speedo was buried, figured had to be some error. motor was trying to wimp out or bog. Will remap this week on the dyno.
You hit the top speed limiter. A remap won't do it, you need a Speedo Healer.
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Candy Thunder Blue 2006 ZZR1400
Stock wheelbase
Max: 205.4 mph in 1.25 miles
2012 ZZR1400 in Golden Blazed Green
Brock CT Full System. etc
Max: 203.1 in 1 mile (so far)
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Sticks_n_Stones
Needs a job
Posts: 3930
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posted June 02, 2008 07:28 AM
You are running it on a dyno arent you? No wind drag to push the bike back and cause the tire to slip. On the road, you will see an even bigger % loss at high speeds, right Bob? Just guessing here, but Bob has mentioned it in the past.
What speed does that start to come into play Bob?
____________
'06 zx14
Muzzy M10/M14
PCIII w/ Muzzy map
Flies out K&N in!
bits n pieces...
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billeason
Zone Head
Posts: 711
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posted June 02, 2008 07:29 AM
I have my shift light set at 10,000rpm's and the bike will it limiter if i'm not quick on the shifter. The tach is showing 11200 or so i'd say the gauges are little off!! Bill.....
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bill eason
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jeff martin
Pro (closed)
jamming
Posts: 1168
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posted June 02, 2008 07:29 AM
How many miles on the back tire. New tire, proper pressure my Garmin 2720 is dead on.
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i play with boats my wife plays with my dingy.
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davej
Expert Class
Posts: 451
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posted June 02, 2008 07:37 AM
Checking the map to make sure not leaning out. The Ely road is 12 miles from the salt flats and is used by the Rally car guys. Motorcycles are banned this year according to the taxi people. Rick has a couple of vettes he races in the rally so I'll find out for sure. Nice thing is, can hit top end within a mile which means I can run taller gear.
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Triumph guy
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BlackMagic14
Needs a job
Posts: 2058
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posted June 02, 2008 10:24 AM
Bill that 10000 actual or indicated??
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted June 02, 2008 02:14 PM
the tach is 500-700 rpm optomistic!
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natural selection.....
destiny will overcome intervention.
Some are not worthy of the effort.
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billeason
Zone Head
Posts: 711
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posted June 02, 2008 04:41 PM
gps
quote:
Bill that 10000 actual or indicated??
Thats what i have my steidmans shift light dip switchs set at 10.000rpm. I had it set at 10600 when i first installed it but every time i adjust it i have to lower the setting to stay out off the rev limiter! My point was the tach is not very accurite. I think the light is getting bad but at first i still saw 11200 on the tach with the light set at 10600 so i'd say the factory tach is not that good!!
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bill eason
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