Design and Engineering Forum
[Home] [Design Resources] [Technology Store]
[Archive#1] [Archive #2] [Archive #3] [Calculators]

Moderators:

Tire traction Question
Post Reply   Forum
Posted by: whtsnake

09/26/2003, 14:56:23

Author Profile Mail author Edit
Are there other factors other than pavement friction and wheel torque (or force at the point of contact) that determine when traction is broken? e.g. A high performance car is running along in 1st gear and the driver decides to stomp on it. Are the tires more likely to break loose if he's at 15 mph, 2000 engine rpm, 200 ft-lbs (2100 at wheels) or 38 mph, 5000 rpm, 280 ft-lbs? Experience suggests the slower one is going the easier to break traction but yet the engine develops more torque at 4000 rpm and transfers more to the wheels. What am I missing?






Post Reply | Recommend | Alert Rate View All  

Replies to this message


Re: Tire traction Smile
Re: Tire traction -- whtsnake Post Reply Top of thread Forum
Posted by: mark

11/14/2003, 08:28:07

Author Profile Mail author Edit
There are so many factors that affect traction in a performance car/race car that books have been written on the subject. When a car gets traction off the starting line but breaks traction once the car is rolling usually the chassis supension setup is the problem. Maybe the car has settled down ( car levels out ) and the rear tires are unloaded. Front springs rates and front shock rates are factors here. Rear suspension set up can be very critical.Most factory stock cars don't have any rear suspension adjustability but, race car suspensions like 4 links and ladder bars are adjustable and can help you gain tration. Also, the engine torque curve may play a large factor in determining traction. But it all comes back to " can your suspension handle the power". I've seen , at the drag strip, pro street cars on 10" wide street tires pull wheelies and full on drag cars running 35 X 21 slicks loose traction with less motor.






Post Reply | Recommend | Alert Rate Where am I? Original Top of thread Previous |   |
Re: Tire traction
Re: Tire traction -- whtsnake Post Reply Top of thread Forum
Posted by: diemeister
Huckleberry
10/18/2003, 19:40:32

Author Profile Mail author Edit
inertia






Post Reply | Recommend | Alert Rate Where am I? Original Top of thread Previous | |
Re: Tire traction
Re: Re: Tire traction -- diemeister Post Reply Top of thread Forum
Posted by: whtsnake

10/21/2003, 13:34:24

Author Profile Mail author Edit
Could you elaborate more? I am working on an Excel spreadsheet that incrementally (say every 0.1 seconds) calculates the cars acceleration, speed, and distance based on wheel torque, weight, friction, etc. Where does the inertia figure in the calculation?






Post Reply | Recommend | Alert Rate Where am I? Original Top of thread Previous |   |
Re: Tire traction
Re: Re: Tire traction -- diemeister Post Reply Top of thread Forum
Posted by: whtsnake

10/21/2003, 13:33:56

Author Profile Mail author Edit
Could you elaborate more? I am working on an Excel spreadsheet that incrementally (say every 0.1 seconds) calculates the cars acceleration, speed, and distance based on wheel torque, weight, friction, etc. Where does the inertia figure in the calculation?






Post Reply | Recommend | Alert Rate Where am I? Original Top of thread Previous | |

Powered by Engineers Edge

© Copyright 2000 - 2018, by Engineers Edge, LLC All rights reserved.  Disclaimer