NatsM

Status: Member
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Last seen: 2 months ago
Member since: 13.05.21
Country: United States
Posts: 118
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8 months ago 

I've made several different versions of equations, some with tire pressure in mind, different Cr or coefficient of rolling resistance ...

Well, at top speed, acceleration is supposed to be zero, or you're at constant velocity. With regards to your example ...

v= 0.00010472ERr/AG S= 0.00023425ERr/AG All I'm saying is these 2 equations cannot be cheated, much like 2 times 3, in ...

As I have said before sometime ago when I joined in, I'm more into or interested only in top speed, ...

Yup, @8,500 rpm, 362 mm radius, 3.45 ratio would result to a speed of 318 mph! Since I used 357 ...

LOL, I didn't mean to put you on the spot. Yeah, I read your post that you got it from ...

This is my calculation. Using 3.200 final drive ratio, in 5th gear, the engine produces 11,193 Newtons of force; 2,075 ...

Thank you.

Thank you.

Well, regarding the Cr or Crr — Coefficient of rolling resistance, if you've been to formal or informal articles, forums, ...

Also, what many don't realize is that aside from gearing, frontal area, drag coefficient, weight or mass, downforce, air density ...

Using your final drive ratio of 3.364 and 0.6566 9th gear ratio, 720 mm diameter or 360 mm radius of ...

Howdy? Yeah, at times things don't add up. We all know theoretical or projected is not the same as actual. ...

Hi there again! Thanks for the feedback. First off, this calculation here is from the 2022 Porsche 911 GT3, NOT ...

*Typo. There should be a / before 0.99988

https://www.automobile-catalog.com/make/koenigsegg/jesko/jesko/2021.html Isn't 1,602 mechanical horsepower equivalent to 1,624 metric horsepower or PS? Now, air density of 1.204 is used for ...

However, on second thought, had I used the SAE J1349 standard air density of 1.157 (77 F; 29.235 inHg; 0% ...

Look, either you haven't been reading my posts, or you weren't paying close attention. I HAVE been using the Crr ...

Oh, one more thing. As I posted before, I have a compilation of Crr formulas aside from the Engineering ToolBox ...

As I said, I'm not forcing anyone to trust and use it. Besides, I'm still experimenting, remember? To each his ...

https://ar-ar.facebook.com/notes/oj-performance/the-mathematics-of-horsepower-why-do-an-engines-power-and-torque-curves-always-c/10152623093145020/

I only used the 10% loss in the example as requested by Nimrod, by the way, and it's not the ...

Hi there again! I don't know why I have to explain this again for you since I've already posted and ...

Cr, Crr or Coefficient of Rolling Resistance Equation

As you requested, I recalculated using the 0.90 instead of my 1.04827, and using the same specs, location and weather ...

That's what it seems if you use my powertrain factor! But don't take my word for it.

Timeline

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Hoppelmoppel123 5m 

added data for Porsche 911 Carrera (996)

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Hoppelmoppel123 13m 

added data for Porsche 911 Turbo 3.6 (964), data for RUF BR2 EKS, data for Porsche 911 Turbo S (964), data for Porsche 911 Turbo 3.3 (964 320 PS) and data for Porsche 911 Carrera 4 Cabriolet (964)

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Hoppelmoppel123 42m 

added data for Porsche 911 Carrera RS 3.8 (964)