stevec
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| posted on 1/6/06 at 09:42 PM |
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160 Mph, ???
Will this really do this speed ?
http://cgi.ebay.co.uk/mk-indy-fireblade_W0QQitemZ4644724688QQcategoryZ29750QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
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muzchap
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| posted on 1/6/06 at 09:45 PM |
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NEVER!!!
It's got the aerodynamicy of an old womans shopping trolley!!!
Theoritically it could probably attain that top speed with the correct gearing - but in reality it just cant...
Happy to be proven incorrect - but my estimation is about 120-130mph top-end...
And no chance with him sitting in it 
[Edited on 1/6/06 by muzchap]
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If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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flak monkey
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| posted on 1/6/06 at 09:45 PM |
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Not a chance
Sera
http://www.motosera.com
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Deckman001
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| posted on 1/6/06 at 09:46 PM |
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The speedo might say that, but a gatso wouldn't comfirm it  Most blade engined Indy's top out at about 130 due to gearing, He might have
got round this with a special diff, but a blade lump wouldn't usualy give out the needed umph to go that fast
Nice car though
Jason
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stevec
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| posted on 1/6/06 at 09:46 PM |
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Thats what I thought, perhaps a tryping erior.
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JoelP
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| posted on 1/6/06 at 09:47 PM |
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dream on!
cant be too light either with a full cage, reverse box and lsd!
350 miles in 2 years seems a terrible shame, i did that in the first week!
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INDY BIRD
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| posted on 1/6/06 at 09:47 PM |
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i persume that a zonda or ultima is towing it to get to that speed???
Yeh wright!!!!!!!!!!!!!!!!!
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joneh
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| posted on 1/6/06 at 09:48 PM |
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Perhaps he has a JATO kit for it? 
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stevec
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| posted on 1/6/06 at 09:52 PM |
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Perhaps he lives near a cliff.
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welderman
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| posted on 1/6/06 at 09:57 PM |
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Have i to take a look at it, it's not far from me.
But i can get over 190 mph on my speedo. Thats why ive got myself a speedo healer now.
Thank's, Joe
I don't stalk people
http://www.locostbuilders.co.uk/forum/23/viewthread.php?tid=172301
Back on with the Fisher Fury R1
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ned
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| posted on 1/6/06 at 10:14 PM |
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even with a 3.14 dif i'd be suprised if it could pull that speed even on a rolling road without the aero problems to worry about.
highly unlikely on a rolling road - not a chance on the road.
Ned.
beware, I've got yellow skin
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Hellfire
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| posted on 1/6/06 at 10:20 PM |
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Who are you lot trying to kid. Everyone knows the Indy is the most aerodynamic of all the sevens. 160mph........... with a Blade engine? EASY. Ours
will do 220mph, the kid next door told me so..................
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stevec
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| posted on 1/6/06 at 10:41 PM |
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LOL.
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Peteff
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| posted on 1/6/06 at 11:55 PM |
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If it was red
it might be in with a chance, any kid knows red cars are faster.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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richijenkin
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| posted on 2/6/06 at 08:38 AM |
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Of course they are
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carnut
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| posted on 2/6/06 at 08:53 AM |
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I bet it wouldnt do a sub 4 sec 0-60 either!
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carnut
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| posted on 2/6/06 at 08:56 AM |
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richijenkin
I love your avatar!
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wildchild
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| posted on 2/6/06 at 09:40 AM |
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not a chance. even with perfect gear ratios. particularly not from a blade.
that's gut feeling. if anyone can give me a rough guess at drag coeff and frontal area of a seven type car I'll happily work out how much
power you would need to get to 160mph.
the 0-60 is vaguely believable.
http://www.wildchild.org.uk
Build photos on Flickr
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matt_claydon
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| posted on 2/6/06 at 09:56 AM |
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According to wikipedia, Cd for a caterham is 0.7. And I found a site listing frontal area as 1.47 m^2
I'd guess an MK has more frontal area with a pretty similar Cd.
I'd do the maths myself but in the 11 months since I finished studying Mech Eng I've forgotton everything
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matt_claydon
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| posted on 2/6/06 at 10:06 AM |
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Nothing better to do!
Drag = 0.5 * Cd * Area *Air Density * Velocity^2
160mph = 72 m/s
Drag = 0.5 * 0.7 * 1.47 * 1.3 * 72^2
Drag = 3467N
Power = Force * Velocity = 3467 * 72 = 250kW
250kW = 335 BHP
For those who can't be arsed with the formulae and conversion factors, this is what it boils down to for a seven in BHP and MPH.
Approximately:
Power Required = 0.00008 * Velocity^3
And
Max Velocity = Cube root of (12500*Power)
Remember this is power at wheels, not engine power.
For my car (137bhp engine) this would give 120mph. I've managed about 105-110 so taking account of drivetrain losses this sounds about right.
[Edited on 2/6/06 by matt_claydon]
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wilkingj
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| posted on 2/6/06 at 10:25 AM |
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quote:
Originally posted by JoelP
dream on!
350 miles in 2 years seems a terrible shame, i did that in the first week!
350 miles... I did that just getting to and from the SVA centre
As for 160Mph.. in theory maybe, in reality, no way!.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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wildchild
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| posted on 2/6/06 at 11:17 AM |
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I make it about 360bhp, but my calc includes a few more losses, such as:
- rolling resistance (I've borrowed values for a daewoo matiz)
- difference between engine test bed power (the 360bhp) and the power it produces under the bonnet with an exhaust on (estimated at 5% loss of
power)
- transmission losses (again estimated as 5% loss of power).
pretty highly tuned fireblade engine to put out 400bhp/litre! maybe he could teach some F1 teams how to build engines!
160mph on the rolling road is not the same!
[Edited on 2/6/06 by wildchild]
http://www.wildchild.org.uk
Build photos on Flickr
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cossey
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| posted on 2/6/06 at 11:56 AM |
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losses from crank to wheels are about 17-22% probably at the lower end for a bec. so 335rwhp means more like 405bhp at the crank.
and fireblade indy would be nearer to 115mph.
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dilley
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| posted on 2/6/06 at 04:47 PM |
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youd need at least a busa turbo running 580 at wheels to hit 160, holeshot racing have got one.
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