Weight and Horsepower

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07-18-2016, 05:05 PM

#16

Veloce Raptor

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Quote:

Originally Posted by winders

jdistefa,

What don't you post something useful instead of being a jerk?

Wow, dude.... Take 2 Chill Pills and call me in the morning

Quote:

Originally Posted by winders

Would it be somehow funny if I told you and Dave to "go to the gym and pump each other"?

And I'd laugh at that too

07-18-2016, 05:25 PM

#17

jdistefa

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Quote:

Originally Posted by winders

Would it be somehow funny if I told you and Dave to "go to the gym and pump each other"?

I don't see the humor in it.

Hell, we do that all the time!

Ok, without further ado, back to weight & horsepower.....

07-18-2016, 06:28 PM

#18

mark kibort

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So, lets see if" the comedians in our midst" has the answer for the follow-on racer tech question.

What is the effect of 5lbs of wheel weight as far as HP cost, for straight-line acceleration at any speed using Winders handy formuals?

https://getyarn.io/yarn-clip/b318236...0-1619177c7191

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I like bacon.

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Originally Posted by Veloce Raptor

LMMFAO one of the best movies ever

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Originally Posted by Quinlan

Lighten up...

Lighten Up Francis - YouTube

07-18-2016, 07:03 PM

#19

Dave 86 930 Fl

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I saw this thread ... Wow, Winders & Kibort, I just knew it was going to be good.

07-18-2016, 07:18 PM

#20

mglobe

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http://youtu.be/y2R3FvS4xr4

07-18-2016, 08:28 PM

#21

sbelles

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07-18-2016, 10:02 PM

#22

MSR Racer

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Kibort is actually an verb

07-18-2016, 11:02 PM

#23

mark kibort

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Interesting that the group that condemns the "Derailing" a thread", makes up more than 11 of the 21 posts so far, (more than 50%) with insults and attempts of humor.

Im curious; Is thread having to do with math similar to the effects of feeding the gremlins after midnight?

07-18-2016, 11:39 PM

#24

LuigiVampa

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Not to be crass but I always try to take a big dump before a race because it can be an extra 1HP. Put that into one of your formulas!

07-19-2016, 08:02 AM

#25

333pg333

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Scanning it quickly but I didn't see a reference between sprung and unsprung weight either.

07-19-2016, 08:38 AM

#26

Veloce Raptor

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Quote:

Originally Posted by LuigiVampa

Not to be crass but I always try to take a big dump before a race because it can be an extra 1HP. Put that into one of your formulas!

There is a great Kimi F1 interview where he discusses just that

07-19-2016, 09:17 AM

#27

Matt Romanowski

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Quote:

Originally Posted by Veloce Raptor

There is a great Kimi F1 interview where he discusses just that

I thought that was at the end to get out of the interview, but I could just be thinking wrong.

07-19-2016, 09:33 AM

#28

Veloce Raptor

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Quote:

Originally Posted by Matt Romanowski

I thought that was at the end to get out of the interview, but I could just be thinking wrong.

07-19-2016, 11:54 AM

#29

Matt Romanowski

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I'll stop thinking now.

07-19-2016, 12:09 PM

#30

Jabs1542

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While we are at it, what about changing wheel diameters. I used the app that ProCoach pointed to in the 'when to shift' thread (I think that's where he referenced it) and calculated my speed at shift points with 20" and 19" rims.

As an engineer it seems that if the same car has a lower top speed due to a smaller radius wheel then it is getting there quicker thus feeling like more HP. Is this correct? If so, then the resulting ratios change my 400HP to 415HP when I change from 20" rims to 19" rims (similar tire profile on each 295/30/R19 or R20).

20" rim (27" tire), 3rd gear max calculated to 112.8mph
19" rim (26" tire), 3rd gear max calculated to 108.7mph
(108.7 / 112.8) = 0.96365 (I got this same ratio regardless of the gear)
(400HP / 0.96365) = 415.087HP

Does this math work? Or is it the other way around and I get less horsepower (intuitively it seems like it should be more)? Less torque results in more HP.

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