posted October 21, 2001 03:39 AM
Doug Meyer/swft - 200mph+ gearing?? Doug,
could you share what sprockets you used on the salt???
Swft - what gearing are you planning on?
My 1361 seems to be running VERY well although i'm still breaking it in. Sooooooo, before I take it back to the 1/4 I am going to see how fast it'll go and want optimum gearing. Any comments would be appreciated.
Thanks
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posted October 21, 2001 07:53 AM
On a dynojet dyno the stock gearing hit rev-limiter at 194-195 mph. With 44/18 combo the dyno shuts down at 200 mph. I figure it to be a 203-204 mph at the rev-limiter line. This would be approx 11,500 rpm for 200 mph.
posted October 21, 2001 10:26 AM
Okay Doug, I'll Bite what gearing will it take to get to 200mph. If you are running 44/18 and for arguments sake, a 11,700 rev-limiter, what is the actual MPH????
I know I should visit the dyno first, figure gears from there but I'd like to do some before & after dyno top end tests. See if the dyno translates into real world performance. ____________
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posted October 21, 2001 12:08 PM
Edited By: fish_antlers on 21 Oct 2001 13:10
To figure that out.. Go to our home page : http://www.zx-12rzone.com or http://www.bikeland.org and then go to the download section of this site... under the ZX12R Downloads section is a utility called "Cool little RPM calculator" donated by one of our members.. .should help you calculate yer gearing.
posted October 21, 2001 12:54 PM
Stock gearing is good for WHAT MPH at 11,700 or 11,750 rpm???
All dyno runs that I have seen puts it at 194-195 mph when the limiter cuts in. I know of 3 Zx-12r that I have personally tested. With 44 or 43 tooth a mph can not be "measured" as all Dynojet Dynos shut off if 200 mph is exceeded. Be aware that slippage on the roll is NOT a facture-I've pulled the bike to the limiter with less than 1/2 throttle and no apparent difference in MPH readings.
So I ask you Doug, on a piece of pavement/concrete with a 30 mph exact tail wind - what would be the MPH when the rev-limiter kicks lets say at 11,750 rpm in 6th gear with a final drive of 18 front and 46 rear.
I find this question to be as old as the existance of the Zx-12r. It has never been properly answered. Again I am looking for MPH at 11,750 with stock gearing in 6th.
This would become the yard stick that all other gearing etc would be measured.
Looking forward to your reply Doug. BTW, thanks for your help back in 1995-96 with the zx-11 cam timing etc. - Frank
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posted October 21, 2001 02:38 PM
I put a 43t on the red 1270 bike. That corrected the speedo error to where it was pretty much dead nuts on. As far as top end goes, it was pretty hard to find enough room riding around to open it up. Still, I did see over 190 on SIR, down the front straight. On the dyno, a 43t will get you a 'dyno overspeed shutdown' before you hit the limiter, so you can definately say it will do over 200 with the 43t. ____________
82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted October 21, 2001 02:55 PM
Edited By: entropy on 21 Oct 2001 15:57
Fish - I have that cool little calculater and it has been 100% useful for gearing my hot rod for the 1/4. However, at max speed in 6th the numbers don't seem to be as good. I have pushed a 17/46 combo into the limiter MANY times and the calcluator say this is 192-ish (depending upon tire diameter assumption), but the Busas I rode with (worked) left me and they say they were doing 194 max????? Tire radius growth? rev limiter variations? who knows.
I, like Zx23rr above, wonder what gearing is needed to hit say 202 (just to be sure) at say 11600 in 6th.
Swft - it seems like the 18/43 will do it, but I wonder if my 1361 with an un-optimized PC3 map will pull it as well as a 18/44.???
I am going to order sprockets tomorrow and am leaning towards a 18/44 combo, but will get 43,44, 45 if trials are needed. This afternoon i got my mileage on the 1361 to just over 400, so next weekend will be "show time, phase 1". I HATE waiting till next weekend; goddamn jobs sure get in the way.
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posted October 21, 2001 05:15 PM
Go with with a 43 or 44 tooth. 44 will get you to 200 IMHO. I am running a 2000 with Muzzy, 3r, K+N's, Dymags. Will lift front on throttle only at 3500. 8000 in second with a very little pull and no throttle or clutch action!! I am not a bring it up to the balance point wheelie kind of guy, but throttle pinned kind.
But I still how that we will get that responce from Doug Meyer.
posted October 21, 2001 07:32 PM
I'm not sure your big motor will need to turn 11,600 to achieve it's top speed although there's only one way to find out. Then again if the tach reads high you may be right. Ken
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posted October 21, 2001 07:42 PM
Entropy - Why don't you have a good map for the 1361?? Are you waiting on dyno time for a custom map? And I don't think there would be anything wrong with going with a 44t, you would certainly be able to pull 200. For Bonneville, I've got everything from a 46t to a 39t, and both a 18t and 17t countershaft sprocket. The idea is that you want to be able to pull peak power regardless of where in the rpm range you need to be, and still meet your target speed for the salt. Depending on the temp/humidity, that might be 11750, might be 10500...So you gotta be able to gear for it!
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted October 22, 2001 12:38 AM
Swft - I have a map from Muzzy which seems to work great, but want to get one made with a DJ250 w//tuning link. This is planned for 1st week in Nov cause I have to get my bike up to Dallas, 4-5 hr drive.
Ken - I need a good dyno pull to see where the power is, and like youu say, 11500 or maybe even less may be where the 1361 lives. I'll take my bike to the guuy who built it in Katy and have him do a pull next Sat. He has an old dependable DJ150.
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Needs a life
Full throttle!
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posted October 22, 2001 04:40 AM
Man, I love running my DJ250 with the Tuning Link software! Mucho reduco in dyno time! And as always, 4 cyl bikes are easier to tune than V twin sportbikes, but cruisers are easiest of all. Something bout that 6000 rpm redline. ____________
82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted October 22, 2001 12:34 PM
Err, I don't mean to be rude but I think Entropy posted on another site asking about gearing for the 12R to hit 200mph+ so I have joined here to answer his question or maybe help if I can (and I am sure I can't but what the hell).
As I remember FK's 12R was running 2 teeth down on the rear from standard at Elvington. This posted 195.9mph genuine through the flyer traps. I think it was about 800-900 rpm away from the redline. FK's bike was lowered with a quickshifter, PCIII and Akro exhaust. It also had the biggest carbon airscoop on it I have ever seen. Mirrors were removed. With this setup it ran a 9.59 quarter too, so perhaps it wasn't such a bad comprimise. I suspect with just a tad more power it would have hit the double ton without bouncing the limiter.
I hope this helps chaps.
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Steely Eyed Missile Man...
posted October 22, 2001 02:47 PM
It ALL depends on how much room you have.
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
posted October 22, 2001 03:03 PM
I think we had about a mile and a half from a standing start then about a third of a mile braking space.
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Steely Eyed Missile Man...
posted October 22, 2001 08:46 PM
1.5 miles? I think I might try an 18/43 or 44.
Doug
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It's not that I think you're dumb, it's just that so much of what you know isn't true....
I KNOW that FK has said that he has a Yosh RS-3 Duplex Race system, but he didn't list it as one of the mods to his bike on those last "flyers". So.... what's the deal, FK - did you have the Yosh exhaust on the bike during your most recent runs??
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