J666AYP
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| posted on 9/8/19 at 04:18 PM |
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Power to weight... again
Hi gents,
Just spinning some numbers in my head and trying to work out a game plan.
The project (when it's up and running) will be about 600kgs and have roughly 250-260hp until I shell out for the M90 upgrade and a decent diff.
Is this going to be too heavy for a serious road car with occasional track use? Or do I need to start shaving down bolts and brackets ect to get it
more towards the 550kg mark? Or..... do I just go down the easy route and just add more power?
I know lighter the better to some extent but there has to be a middle ground between weigh and power?
Any input appreciated as this will govern how I progress with the build.
Jay
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CosKev3
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| posted on 9/8/19 at 04:32 PM |
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No that will be a stupidly fast car!
Mines now 700kg with three quarters of a tank of fuel,286bhp so that makes it 408bhp per ton.
It goes very well!
Have a look at other cars that are in the low 400bhp per ton bracket and you'll have a good idea on how it goes.
260bhp and 600kgs gives you 433bhp per ton
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bi22le
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| posted on 9/8/19 at 05:03 PM |
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433bhp/ ton is a 500bhp tintop, and that's good power.
Lighter is faster, but power can help that alot.
I have "only" 280bhp/ ton and am always comparibly quick on a track day.
Your 433 punches well above its weight on a track as your brakes only have to do half the weight.
Track days ARE the best thing since sliced bread, until I get a supercharger that is!
Please read my ring story:
http://www.locostbuilders.co.uk/forum/13/viewthread.php?tid=139152&page=1
Me doing a sub 56sec lap around Brands Indy. I need a geo set up! http://www.youtube.com/watch?v=EHksfvIGB3I
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coyoteboy
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| posted on 9/8/19 at 10:53 PM |
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quote:
Originally posted by bi22le
433bhp/ ton is a 500bhp tintop, and that's good power.
Lighter is faster, but power can help that alot.
I have "only" 280bhp/ ton and am always comparibly quick on a track day.
Your 433 punches well above its weight on a track as your brakes only have to do half the weight.
Id say closer to a 600hp tintop, most 600hp cars are 1.3+ tons. And as you roughly say, adding power helps in the straights but losing weight helps
everywhere.
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fregis
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| posted on 10/8/19 at 10:54 AM |
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My opinion dont bother about weitght so much. It is 550, 600 or 650kg, will still be low weight and to use full that power on track need skills and
balls.
I sugest go for start with more weight, and later when start using full throttle go for lighter.
Never be afraid to do what you are insolvent, remember: amateurs built the ark - Professionals built the Titanic.
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J666AYP
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| posted on 10/8/19 at 11:58 AM |
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Thanks for the info gents. Think I will put off the M90 swap for now then and be a little more careful about putting any more weight into it.
I'm building it up with all the supporting engine mods incase more power is ever needed.
Jay
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jeffw
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| posted on 10/8/19 at 12:02 PM |
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The less it weighs, the less you have to stop and turn.
The Phoenix was 630Kg and 400BHP and was a reasonably rapid kitcar, the Zeus is 530Kg and 550BHP-600BHP and is a completely different level.
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J666AYP
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| posted on 10/8/19 at 01:21 PM |
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quote:
Originally posted by jeffw
The less it weighs, the less you have to stop and turn.
The Phoenix was 630Kg and 400BHP and was a reasonably rapid kitcar, the Zeus is 530Kg and 550BHP-600BHP and is a completely different level.
I would be happy with the 400BHP 
[Edited on 10/8/19 by J666AYP]
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snapper
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| posted on 10/8/19 at 03:00 PM |
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Depending on how much you weigh perhaps a tin or two of slim fast might make more of a difference 😆
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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J666AYP
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| posted on 10/8/19 at 03:24 PM |
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quote:
Originally posted by snapper
Depending on how much you weigh perhaps a tin or two of slim fast might make more of a difference 😆
I'm 6'1" and 14 stone so I cant shed too much body weight 
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