RE: top speed?
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RE: top speed? - 9/13/2006 3:35:34 PM
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tdgroup
Posts: 112
Joined: 8/16/2006
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got a 1995 900rr with 99 plastics.. micron pipe. i got to about 145 before i got scared....lmao
< Message edited by tdgroup -- 9/13/2006 4:29:26 PM >
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RE: top speed? - 9/13/2006 4:21:28 PM
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Lance
Posts: 6
Joined: 7/14/2006
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98 900rr all stock except full yosh exhaust and jets. 140 is the fastest I've gone, lost my nerve and slowed down at that point but I know it will do much more. All I kept thinking about is how it would feel hitting the pavement at that speed, which was more than enough to persaude me to cut the throttle. Call me a wuss, I admit I am afraid of it sometimes but I'm too young to die now, having too much fun;)
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RE: top speed? - 9/13/2006 4:34:23 PM
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JAYS900RR
Posts: 97
Joined: 7/28/2006
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I've gone 180 with no problem on my 99 with 95 motor.. But the motor has alot of work done to it.. Yes it was a track bike I switch the frame to make it street legal.. The plastic I bought from a salvage yard in ct for a great price..
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RE: top speed? - 9/13/2006 10:26:40 PM
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ducatijay
Posts: 57
Joined: 2/15/2006
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[/quote]
Negative. Sort of. The stock bike is not gear limited, it is redline limited. Chopping the gearing a bit will, possibly, bump the engine up into the powerband when it matters, say 150mph, rather than the engine lagging below its peak power if it had the stock gearing.
With 15/45, what rpm was 151mph?
[/quote]
what do you mean "redline limited?"
yes, some under powered bikes(like my ducatis, ) do run out of motor before before they run out of gear. but this isn't the case with CBRs. when my '93 RR was stock it was still able to run out of gear.
like i said, my bike topped out at 151mph on GPS. that's about as accurate as you're going to get. my speedo read 161-163mph. my '93 has the speedo off the front wheel. '95 & up speedo is off the tranny. so anyone with a '95 up RR with different gearing means they would be even more inaccurate.
anyway, all i'm saying is i doubt anyone has seen 180mph on a 900RR............
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RE: top speed? - 9/14/2006 2:29:16 AM
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66droptop
Posts: 127
Joined: 4/17/2006
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quote:
ORIGINAL: ducatijay
what do you mean "redline limited?"
yes, some under powered bikes(like my ducatis,) do run out of motor before before they run out of gear. but this isn't the case with CBRs. when my '93 RR was stock it was still able to run out of gear.
like i said, my bike topped out at 151mph on GPS. that's about as accurate as you're going to get. my speedo read 161-163mph. my '93 has the speedo off the front wheel. '95 & up speedo is off the tranny. so anyone with a '95 up RR with different gearing means they would be even more inaccurate.
anyway, all i'm saying is i doubt anyone has seen 180mph on a 900RR............
I was under the impression that the bike is limited by aerodynamic drag and not gearing. Meaning that it'll run out of power before it runs out of gear. So 161mph or whatever, but with another 3000rpm left. If the bike had 3grand left, and we're going all the way to the ignition cut off at 12,000rpm, then the bike would only be at 9000rpm. With the maximum power (stock) at 10,800rpm (something in that ballpark, it was 10,000something), then if you cut the gearing down a bit you could get the engine into a more powerful portion of the power band and therefore eek out a couple more mph.
Now if 15/45 is too much of a gearing chop on actual 900RRs instead of the theoretical world, I don't know. That's why I was wondering what rpm you were at when the bike was at 151mph with the 15/45. I could then figure out what true mph 12,000rpm translates too. I wonder if the earlier 900RRs have different gearboxes than the later ones. I know the ratios in the 29/54 are different than the '98/'99 9.
Now I've got 17/43 gearing and should have 200+whp in a couple weeks. I want to go to Bonneville and join the 200mph club SO BADLY. Might need a smaller rear gear.
< Message edited by 66droptop -- 9/14/2006 2:31:51 AM >
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-Rob
'66 Ford Galaxie 500XL convertible, baby blue
'98 900RR turbo, yellow
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RE: top speed? - 9/14/2006 12:12:33 PM
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JSTATL
Posts: 161
Joined: 5/18/2006
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66 what have you done to your ride to get that much power out of it?
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RE: top speed? - 9/14/2006 4:33:10 PM
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1badeg
Posts: 79
Joined: 5/1/2006
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quote:
ORIGINAL: JSTATL
66 what have you done to your ride to get that much power out of it?
Read the sig. Turbo.
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RE: top speed? - 9/14/2006 11:02:11 PM
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woody900rr
Posts: 97
Joined: 4/18/2006
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Ok Ok Im with ducatijay on this one guys. It is impossible for a bike that has been gear differently than stock to run a faster top speed than a stock geared bike. All the previous posts all say bikes have dropped teeth on front and raised teeth on rear, this only improves the tourque the bike has under acceleration... nothing to do with top end speed. Bike wike will actually loose top end speed when the gear ratio has been dropped to a "quarter mile" gear set up. The bikes will feel faster and get to the final speed they will travel at a faster pace with the lower gear ratio but will not reach the same top speed as a stock geared bike.
The reason they run top speed tests at the salt flats is because it takes longer to get the vechiles upto speed due to the gearing being set for a top speed, have you ever watched those 200+ mph guys? They accelerate like turtles but once they get moving they FLY!
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WOODY CBR 900RR 98
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RE: top speed? - 10/20/2006 2:37:18 AM
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chrisb62186
Posts: 5
Joined: 10/20/2006
From: fort campbell, ky
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i've got a 93 900rr full exhaust haven't looked at everything else yet but i hit 165 - 170 on the way back from the dealership with only a month riding.
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RE: top speed? - 10/20/2006 11:52:22 PM
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Thor
Posts: 75
Joined: 4/16/2005
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my fastest is 160ish registered on an 'o6 R6s. Not tapped, and not my speedo.
x
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'99 900rr
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RE: top speed? - 10/21/2006 7:05:46 PM
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vaggabon
Posts: 49
Joined: 8/19/2006
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I will have to admit that I chickened out at 155 cause my 93 RR was bouncing too much on these wisconcin country roads.
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RE: top speed? - 11/1/2006 9:47:51 PM
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Skater
Posts: 44
Joined: 4/8/2006
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Hey woody, if the bike has reached it's top speed in top gear AND the bike is not at the peak horsepower rpm, then regearing the bike, whether it be up or down, so that the bike is at the peak horsepower rpm, will increase it's speed. Think of it this way, say a bike has infinite gears and you keep upshifting. Eventually, the bike will not have enough horsepower to turn over a big gear, because it will be trying to turn at 1000rpm at 150mph. So you drop a gear, then another, until you top out on speed. Every time someone goes for a top speed run, they will always calculate for the horsepower to be in the peak at the speed they want, taking into acount the horsepower. Remember it's horsepower that you need for top speed, so you better get in the peak power. I read a car magazine once where a mustang went faster in 5th rather than 6th because 6th was too tall.
< Message edited by Skater -- 11/1/2006 9:50:07 PM >
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UB6 IB9
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RE: top speed? - 11/2/2006 3:26:43 AM
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tank35
Posts: 4
Joined: 11/2/2006
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my 99's dynoed top speed in 4th gear is 163.3mph i my self have hit 185 in 6th with 1200rpm to go i have also climbed to red line with the speed o pegged what that translates to in real life i don't know but i can say that when the dyno showed 163 my bike said 155 you guys to the math
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99 900RR full 2bros,factorypro pressurized airbox titanium jets,factorypro shiftkit, factorypro ignition advancer,barrnett racing clutch,erion racing valves,did gold 520conversion,flo commander,bt014,ebc brakes
rwhp134.27rwtq97.86top speed 4th gear 163
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RE: top speed? - 11/2/2006 9:19:59 AM
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woody900rr
Posts: 97
Joined: 4/18/2006
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I seem to be corrected, sorry about the misleading info. It just doesnt make any type of sense if a bike is geared down to get better acceleration than it should lose to end, thats all I was trying to say. The post skater left makes prefect sense. <~~ guess I'm the idiot again!
< Message edited by woody900rr -- 11/2/2006 9:22:05 AM >
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WOODY CBR 900RR 98
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