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Author: Subject: Power to weight... again
J666AYP

posted on 9/8/19 at 04:18 PM Reply With Quote
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

posted on 9/8/19 at 04:32 PM Reply With Quote
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

posted on 9/8/19 at 05:03 PM Reply With Quote
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.





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coyoteboy

posted on 9/8/19 at 10:53 PM Reply With Quote
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

posted on 10/8/19 at 10:54 AM Reply With Quote
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.





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J666AYP

posted on 10/8/19 at 11:58 AM Reply With Quote
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

posted on 10/8/19 at 12:02 PM Reply With Quote
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

posted on 10/8/19 at 01:21 PM Reply With Quote
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

posted on 10/8/19 at 03:00 PM Reply With Quote
Depending on how much you weigh perhaps a tin or two of slim fast might make more of a difference 😆





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J666AYP

posted on 10/8/19 at 03:24 PM Reply With Quote
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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