winders

I am sorry I tried to post something that I thought might be interesting or useful......clearly it was not either.

mark kibort

Yes. often talked about, often misunderstood as well.

The next chapter of this topic is the effects of the mass if added to the car's rolling parts.
wheels and tires or Flywheels. Once we get a transnational (linear, non rotational) equivilance, then we just plug it into your formula above to see the effects as if the equivalent weight has been put IN the car.

you often hear, relative to what you have heard about Hp to weight equivilance, is that "1lb rotating is worth 15hp" or something odd like that. (rotating mass to HP equiv) it's the same mistake.... with rotational it depends on how fast the load is being accelerated , or if its flywheels engine rotating mass, it depends on the gear you are in..... or , if it is on the wheel or tire after the rear end gear, it can only be an absolute maximum as if 2x that weight was in the car.

Then, there is actual HP/weight ratio vs Aero to HP ratios as well.

Edit:

an even easier way to do this is to just take the new HP/weight ration and take the 1/x (inverse) and then just multiply the weigiht savings to get the HP saved (or equiv gains).

2750 -100lbs = 2650lbs/225hp = 11.77 (hp/weight ratio) .849 is the inverse of that ratio ( 1/11.77) and then you just multiply that times the weight you reduced by , or in this case 100lbs = 8.49HP..... a little easier.

so, in otherwords... just take the new HP/weight ratio and take the inverse, and multiply it by the weight you have lost.

LuigiVampa

You guys are seriously messing with my diet! 10lbs equals 1HP because racecar.

All your fancy words, formulas and heavy thinking will never change this!

mark kibort

if you race car has a 10:1 HP/weight ratio, then you are right.
But for me, (and seems for you too) 10lbs for 1hp is a good ball park ratio and it works in most cases, except for Winders 2200lb 911.

2200lbs -100lbs is 2100lbs /300hp = 7:1 ..... (INV) x 10lbs = where 10lbs is more like 1.4hp, or in this case, 14hp per 100lbs

(lets check my work.... 2200lbs/314hp = 7:1...... same as above ratio but 14hp more for same HP/weight. )

winders

Removed as it was not useful....

jdistefa

I like bacon.

mark kibort

didnt mean to add to give your diet unreasonable goals!

yep, and the short cut is just 8.63 (INV) x that weight.

.11587 x that weight = 11.59HP.... same result, just easier to think about and put in a calculator

winders

Easier to think about? You have to calculate the new power to mass ratio, inverse it, and then multiply that number by the weight removed. That is not any easier to think about nor is it any simpler to input into the calculator than the formula I provided. The formulas I provided are simpler to deal with in a spreadsheet too.

mark kibort

I think so, but it depends on what you think is easier. For me, just thinking about new HP/weight ratio and 1/x that and multiply by the weight reduction is easy to think about as well.
Both ways are pretty easy

Thanks for posting... this comes up a lot!

jdistefa

Veloce Raptor

LMMFAO one of the best movies ever

winders

jdistefa,

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

jdistefa

^ That's funny coming from you Scott!

It was just a joke, jesus.

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.

I tried to provide some useful information....

Quinlan

Lighten up...