lietoome
Needs a job
Posts: 2033
|
posted February 03, 2007 07:33 AM
16/42 top speed?
Could someone help me out with theoretical top speed? Could it still hit 186?
  
|
Xtremespeed
Expert Class
Posts: 415
|
posted February 03, 2007 07:56 AM
Or 16/41?
|
1badzx12r
Needs a life
Posts: 8321
|
posted February 03, 2007 08:19 AM
quote:
Or 16/41?
i had my on gps to 174mph on 16/41 and it was in redline
____________
http://www.youtube.com/watch?v=S06nIz4scvI
|
Xtremespeed
Expert Class
Posts: 415
|
posted February 03, 2007 11:05 AM
So much for that idea.
Thanks
|
kspz3
Expert Class
Posts: 334
|
posted February 03, 2007 11:22 AM
quote:
Could someone help me out with theoretical top speed? Could it still hit 186?
No - 171MPH and the 186 MPH speed limiter will kick in unless you have a speedo healer inplace. With Sppedo Healer the top rev limiter will hit at 184MPH and that will be all she has got with that gearing.
KSP
|
lietoome
Needs a job
Posts: 2033
|
posted February 03, 2007 11:42 AM
thank you.
|
RICH CRAFT 1
Zone Head
Posts: 681
|
posted February 03, 2007 03:36 PM
16-42 = 4.19 Gear Rtio @ 76.5 Tire Circ @ 11000 RPM =189.75 MPH. A Stok zx12 is 4.21 G-R
|
ninja14
Pro
Posts: 1136
|
posted February 03, 2007 05:44 PM
I can't get to the limiter w/ my 16/43 :-)
|
kspz3
Expert Class
Posts: 334
|
posted February 03, 2007 08:08 PM
quote:
16-42 = 4.19 Gear Rtio @ 76.5 Tire Circ @ 11000 RPM =189.75 MPH. A Stok zx12 is 4.21 G-R
Rich so what is the diameter of the tire with 200lb rider with 0 miles on the tire, to 4,000 or 5,000 miles on the tire? Then how do you calculate for tire expansion and any spiing or slippage?
KSP
|
Jim K
Expert Class
Posts: 141
|
posted February 03, 2007 10:58 PM
Try This....
http://www.xs4all.nl/~ator0437/gc/
____________
Never did get the whole "Harley" thing!
|
Halvefast
Zone Head
Posts: 806
|
posted February 04, 2007 05:33 AM
All things entered, obviously minus wind resistance, it shows that gearing capable of 191mph
____________
Texas Mile 200.256mph - Oct. 2007 (Update 202.577mph Oct 2008) NOS assisted
ECTA Ohio Mile 195.132mph
TexasMile 2012 199.9 mph all motor!
Streetriders Shootout 2008 series Pro/ET Champ!
Streetriders Shootout 2007 Series Pro/ET Runner-up!
|
Xtremespeed
Expert Class
Posts: 415
|
posted February 04, 2007 02:08 PM
Has anyone tested the 16/41 with gps?
|
kspz3
Expert Class
Posts: 334
|
posted February 04, 2007 02:58 PM
 Edited By: kspz3 on 4 Feb 2007 17:56
I have watched everything from the math to the trap speed - the major issues relate to tire wear, tire deformation at speed and tire slippage - My best estimates are stock (17/41) will do 200.xxMPH at redline in 6th gear as confirmed in Brock diaries 3.0 as he was cliipping the revlimiter in the traps. Top speed for my gearing (18/40)is 195.xx in 5th and 217.xx in 6th. Mine caught rev limiter about 125 feet befor the trap - and was clocked at 193.9MPH. - which is reduced from the hitting into rev limiter. These number would put 16/42 at 184.xx. on the rev limiter in 6th These numbers also align with drag strip trap spedes predicting stock to do 155.xx MPH in 4th when you catch the rev limiter. I think you should be able to correlate others' actuals at the track with these reference points.
Kevin
|
Xtremespeed
Expert Class
Posts: 415
|
posted February 04, 2007 04:20 PM
Thanks Kevin.
Thats quite thorough.
I want to put the 16 on, but I dont want the bike to top out before the speed limiter. I really
don't care much to run over the limiter, but right at it would be nice.
|
kspz3
Expert Class
Posts: 334
|
posted February 04, 2007 06:06 PM
16/41 should do 188.xxMPH on the rev limiter assuming a speedo corrector to get past the normal factory speed limiter which will kick in around 175MPH.
|
Xtremespeed
Expert Class
Posts: 415
|
posted February 04, 2007 07:41 PM
Cool! Already ordered a speedohealer. I hate the optimistic, factory speedo .
|
ninja14
Pro
Posts: 1136
|
posted February 04, 2007 07:48 PM
quote:
Cool! Already ordered a speedohealer. I hate the optimistic, factory speedo .
What you will gain in speedo accuracy you will lose in ODO accuracy......
|
flyboy
Pro
Posts: 1536
|
posted February 04, 2007 08:30 PM
Edited By: flyboy on 4 Feb 2007 20:31
Do you want a top speed or top accerlaration? You can't have both. For top speed go to an 18/41 at seal level or maybe a 17/41 or 17/39 at higher altitudes. It will depend on your density altitude.
____________
'There's more living in five minutes flat-out on a bike than some men have in an entire life'.
"The World's Fastest Indian"
One fast red ZX-14,
Three World and four National Land Speed Records,
One faster red and white Cessna Turbo 210
|
BobC
Pro
Posts: 1736
|
posted February 05, 2007 01:05 AM
16/42 gearing will give you 17.38mph per 1000rpm.
____________
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)
|
kspz3
Expert Class
Posts: 334
|
posted February 05, 2007 06:32 AM
Edited By: kspz3 on 5 Feb 2007 06:33
Bob - what set-up (e.g 18/41) were you and your friends using on your timed runs with clocked speed - your numbers are still 3% optomistic from my perspective. Also how much tire pressure and tire wear? Flyboy - what gearing were you running at Bonneville and what top speeds did you achieve? Did you have any runs that you stayed in 5th gear or was everything in 6th?
PS - Any of you using data acqusition units that records during runs?
KSP
|
BobC
Pro
Posts: 1736
|
posted February 05, 2007 07:16 AM
Edited By: BobC on 5 Feb 2007 07:30
quote:
Bob - what set-up (e.g 18/41) were you and your friends using on your timed runs with clocked speed - your numbers are still 3% optomistic from my perspective. Also how much tire pressure and tire wear? Flyboy - what gearing were you running at Bonneville and what top speeds did you achieve? Did you have any runs that you stayed in 5th gear or was everything in 6th?
PS - Any of you using data acqusition units that records during runs?
KSP
Firstly I use 76.92 inches as the tire circumference in the spreadsheet I developed to play with gear ratios.
Last year I was geared 18/41 for the 205mph run. I thought a tad over-geared but then a nice tail wind came to assist, pure luck. It was the first time out after modifying the bike so it was all theory up to that time. Now I have some real data to go forward from.
18/41 would give 216mph at 10800rpm which is why I said over-geared. 17/40 would be good for 209mph at the same 10800rpm. (That's spreadsheet rpm not tacho' rpm). I will probably gear 17/40 next time because with 190bhp or thereabouts it's unlikely to pull max rpm with a higher ratio. I don't have any data logging or acquisition, the speeds at our meeting are measured by Trevor Duckworth's Straightliners organisation, they are used for Records meetings here in the UK and are accurate.
I didn't do any runs in 5th but the same rpm that gave me 205 in 6th would give 184 in 5th. Tyre wear ? I don't do quarters, just top speed runs, but still with a pretty hard launch. The bike has done around 40 top speed runs and 2000 miles. The rear is just about ready for a change. I have kept to standard pressures and OEM Bridgestones.
____________
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)
|
flyboy
Pro
Posts: 1536
|
posted February 05, 2007 09:04 AM
At Bonneville, with the density altitude, I had around 158 hp and went 195.1 mph. Two of my runs were in fifth gear and I couldn't get it into 6th.
____________
'There's more living in five minutes flat-out on a bike than some men have in an entire life'.
"The World's Fastest Indian"
One fast red ZX-14,
Three World and four National Land Speed Records,
One faster red and white Cessna Turbo 210
|
kspz3
Expert Class
Posts: 334
|
posted February 05, 2007 11:01 AM
Edited By: kspz3 on 5 Feb 2007 11:02
Flyboy - do you recall the speed that you attained on those 2 runs - and were you running stock gears or did you change either the front or rear sprockets?
also what were your class designations? for AMA and FIM
Kevin
|
flyboy
Pro
Posts: 1536
|
posted February 05, 2007 04:45 PM
Edited By: flyboy on 5 Feb 2007 16:47
I don't recall the classes, either PP or MPS. Fifth gear runs got me around 186 mph. I started 18/41, then went to 17/41, then to 17/39. Highest RPM achived was only 10,200 which was not optimum so I will be experimenting again this Sep. You can read about the week at--
http://www.bikeland.org/board/viewthread.php?FID=23&TID=26696
____________
'There's more living in five minutes flat-out on a bike than some men have in an entire life'.
"The World's Fastest Indian"
One fast red ZX-14,
Three World and four National Land Speed Records,
One faster red and white Cessna Turbo 210
|
Xtremespeed
Expert Class
Posts: 415
|
posted February 06, 2007 06:24 PM
quote:
What you will gain in speedo accuracy you will lose in ODO accuracy......
Yes, I'm aware of that. Damn the ODO, I want to know how fast I'm going without
doing the math constantly. I know, I'm lazy. lol!
|
|
|
HOME
NEW TOPIC