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Post by denmark on Mar 1, 2013 21:28:27 GMT
hello how fast is it from 0-100kmh and top speed
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Post by testarossa on Mar 3, 2013 19:41:42 GMT
0-100km/u in 3.9 sec, top speed of 225km/u with stock power. www.roadtrackrace.co.uk/mevabusa_specification.htmlThe Hayabusa engine can easily be tuned though and the sprocket driven differential gives you the option to alter the final gear ratio to your liking with little effort/cost.
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Post by marshabusa on Mar 5, 2013 17:35:47 GMT
I am also itching to find this out myself, final drive ratios and wheel diameters also impact these figures a lot though and I am actually busy trying to decide what final drive ratio I want to achieve. The busa engine runs standard a 16T sprocket I believe, I've had my rear diff delivered now but I've no idea what sprocket it was supplied with (won't know til April). It is either a 46, 47, 48, 49 or a 50T sprocket. So am presently having a lot of fun theoretically figuring out what speed should be achievable with different ratios (cheating using online calculators). My thoughts so far are leaning more towards sacrificing top speed for better acceleration. When can top speeds be achieved anyway. Other peoples thoughts on this will be interesting, 15T and 17T sprockets for the engine are easily available and i will be running 15inch wheels, I was guessing 19inch diameter with tyre.
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Post by Paul (madeye) on Mar 5, 2013 17:39:16 GMT
i used gear commander to work out ratio for my racing. i can also lay my hands on 4 brand new custom cut front sprockets if you need them. from a guy running a gsxr 1000 powered speeds racer. i think he only wanted 15 each for them
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Post by airforceone on Mar 5, 2013 17:44:11 GMT
I would second sacrificing top speed for acceleration. I'm looking at this myself, I've got a rolling road sorted for First week in April to tweak the engine with it's new BUSA TB's. I was asked by the guy at the tuning centre what I preferred, top speed or acceleration. Had never thought about it before but definitely acceleration. I don't intend doing over 100+ MPH anyway. I will however be restricted by my bog standard IB5 box.
Ned
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Post by Paul (madeye) on Mar 5, 2013 17:56:52 GMT
without a doubt, thats why i chose a supercharger over a turbo, so i had linear predictable power, i would imagine a rocket will become unstable and twitchy around 120mph, but getting there should be immense fun and always sideways..lol
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olberj
Full
SC Rocketeer
Posts: 150
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Post by olberj on Mar 5, 2013 18:29:47 GMT
The way i like to work it out is my max speed i think i will do plus 15-20mph (unless that's too much)
Doing 120 in a car that can do 140 is a lot better than doing 120 in a car that can do 125mph as you tend to get up to that speed and hold it for a while.
it's certainly that way up here when we go hooning.
Sacrifice a little acceleration for top speed and you'll find it's better on the road. You'll possibly never do the ultimate top speed but 85% will be so much nicer than 99% over more than 500yards.
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Post by slugshot on Mar 5, 2013 21:56:49 GMT
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Post by testarossa on Mar 6, 2013 0:02:01 GMT
I'm not sure how accessible the sprockets are on a Mevabusa but if they are reasonibly accesible I reckon you could switch the final gear ratio in under 15 minutes (not having a swingarm in the way).
If so I would definitely go for a top speed of about 120mph and an extra pair of sprockets (with gearing compared to the original bike gearing) for the 4 times or so your gonna use it for long distance on the motorway.
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Post by marshabusa on Mar 6, 2013 7:52:02 GMT
Morning Guys, The input and experience is very much appreciated. Thanks for the wheel diameter information Kevin. I am currently away at sea so unable to measure and count things, so I guessed a little just to get some figures down. The rear diff gear is a split gear (two halves) and quite accessible, the idea of having different gears depending on usage I like a lot. Like you say, majority of the time I’d probably have it geared for low top speed. Paul do you know what tooth count the gears are?
Dean
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Post by Paul (madeye) on Mar 6, 2013 11:04:39 GMT
i think 14,15,16&17 but i will confirm i think they were on a 530 pitch
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Deleted
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Post by Deleted on Mar 6, 2013 11:13:26 GMT
without a doubt, thats why i chose a supercharger over a turbo, so i had linear predictable power, i would imagine a rocket will become unstable and twitchy around 120mph, but getting there should be immense fun and always sideways..lol True, but please note this is also determined by turbo size, manifold design, compression ratio etc. Hence my choice for turbo power. And yes, i have been tempted by rotrex superchargers lol.. especially when the turbo route was daftly hard due to engine bay size lol... F1 cars are supposed to be using turbos next year, 1.6 litres in size.. Its all in the desigb
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Post by roadtrackrace on Mar 6, 2013 20:34:08 GMT
I am also itching to find this out myself, final drive ratios and wheel diameters also impact these figures a lot though and I am actually busy trying to decide what final drive ratio I want to achieve. The busa engine runs standard a 16T sprocket I believe, I've had my rear diff delivered now but I've no idea what sprocket it was supplied with (won't know til April). It is either a 46, 47, 48, 49 or a 50T sprocket. So am presently having a lot of fun theoretically figuring out what speed should be achievable with different ratios (cheating using online calculators). My thoughts so far are leaning more towards sacrificing top speed for better acceleration. When can top speeds be achieved anyway. Other peoples thoughts on this will be interesting, 15T and 17T sprockets for the engine are easily available and i will be running 15inch wheels, I was guessing 19inch diameter with tyre. A lot of thought went into choosing the correct diff ratio for the Mevabusa. We sought the advice of West Garage who modify the diffs for us. We supply the 15" wheels with 195-50/15 tyres and this combined with a stock Hayabusa front sprocket gives a theoretical top speed of 162mph at 12,500rpm in 6th gear. What this realistically means is that it will cruise at 81mph at 6250rpm or 12.96mph per 1000rpm if you prefer. If you go for lower ratios than this, cruising anywhere (read driving in normal traffic) becomes very, very tiresome. On the original Atomic we had 9.5 mph per 1000rpm which gave a top speed of 123mph at 13,000 rpm. Great you would think but, a bike engine doing 9000rpm for half an hour while you are sat at an 85mph fast lane cruise getting to your fave track for a track day is not a very nice thing to drive. There is a balance of course and a tall first gear on a bike engined vehicle can be pain for hill starts, but the Busa engine is torquey, and our demo vehicle is absolutely spot on. It's been well tested on both road and track and if a mix of both road and track use are intended, then I reckon you'll hard the Busa's current choice of ratios hard to beat. RTR
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Post by Paul (madeye) on Mar 6, 2013 20:44:09 GMT
i think 14,15,16&17 but i will confirm i think they were on a 530 pitch this info was correct, were made for a k5 powered speads car. but suzuki is suzuki. he said he will take 15 each or 50 for all 4
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Post by roadtrackrace on Mar 6, 2013 20:52:23 GMT
without a doubt, thats why i chose a supercharger over a turbo, so i had linear predictable power, i would imagine a rocket will become unstable and twitchy around 120mph, but getting there should be immense fun and always sideways..lol No need to imagine, the facts are available. Pete Dove did a recorded 140mph in his 220bhp Rocket at Eagle Canyon Raceway in the States. Positive toe all round (slightly more on the rear than the front) ride height set low and dollop of negative camber made the Rocket very stable although head wobble was an issue due to the wind blast. As for sideways, you may well be very disappointed. The Rocket just digs in a goes due to the fact that the engine is situated perfectly for this. Just look at the wet race footage of the Rocket at Brands, whilst everything else was very sideways the Rocket was always stable and always fast. Of course oversteer can be provoked at will with enough power, but sideways is not a characteristic you would normally associate with the Rocket. Incidentally, Pete does have both front and rear spoilers fitted although one has to wonder if it would have been faster without the drag that they inevitably create. Ah yes, the great drag-v-downforce issue... We all remember the Top Gear Koenigsegg with and without the rear spoiler...
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