carnut
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| posted on 22/4/03 at 08:47 PM |
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top speed
As ive nearly finished my build and am very close to getting on the road i keep wondering what kind of acceleration and top speed i will expect to
get.
Could some of you who have bec's on the road tell me what there top speed and 0-60 times are. If you couls also include engine spec and car
weight i would be most greatful.
thanks
Carnut
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Jon Ison
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| posted on 22/4/03 at 10:31 PM |
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A lot is down to gearing/diff ratios but ive seen over 130mph and timed at sub 4 secs 0-60.............
higher top speed = slower 0-60.
158bhp, around 450kg, without my slim belly on board of course.
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chrisg
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| posted on 22/4/03 at 11:04 PM |
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Mines faster than Jon's
Whatever he says, and mine does Jon's top speed +1 infinity so there.
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Simon
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| posted on 23/4/03 at 09:00 AM |
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Carnut,
As Jon says, it's all down to gearing (lets assume you have a reasonable about of power).
My R V8 engined effort, with the current 3.82:1 diff has a theoretical (coz I haven't started it yet:-) ) top speed of 120.16mph (5500rpm) which
I reckon it'll do.
If I put in a 3.08 diff, that becomes 149.03, which it probably won't do - not without another 100 horses.
For acceleration the 3.82:1 should be quicker to 60 starting in 2nd gear, changing to 3rd. However, with the lower ratio, I could do the whole sprint
in 2nd, so I may lose enough time with the higher ratio, just cos I've got to change gear.
So, not knowing what engine etc you are using your acceleration could be 0-60 in 3.5 ish like Mr Ison to 10 (ish) if you're using a standard 1.3
crossflow and a top of between 80 and 150.
ATB
Simon
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Simon
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| posted on 23/4/03 at 09:02 AM |
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Carnut,
Just read your profile and am guessing that you are using a Blackbird engine in an Indy.
I reckon it'll be quite quick!!
ATB
Simon
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andyd
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 posted on 23/4/03 at 10:56 AM |
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Excel spreadsheet
You may like to try my spreadsheet. Just adjust the figures highlighted in yellow to give you theoretical speed in each gear and revs in each gear at
a certain speed.
You'll have to find out the actual gearbox ratios for the Blackbird lump though as the ones on there are for a '96 Fireblade.
Enjoy.
Andy
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Forcus
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| posted on 13/5/03 at 04:45 PM |
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Thanks for the spreadsheet!! Now that I have everything laid out, I know that a 4.11 rear is just not going to work.
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andyd
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| posted on 13/5/03 at 07:10 PM |
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quote:
Originally posted by Forcus
Thanks for the spreadsheet!! Now that I have everything laid out, I know that a 4.11 rear is just not going to work.
No worries, glad to be of help. After all that's what we frequent this forum for. 
Andy
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