Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Lateral grip: Optimize for wheel bump travel or shock stroke?

Lateral grip: Optimize for wheel bump travel or shock stroke?

Lateral grip: Optimize for wheel bump travel or shock stroke?

Reverse trike on double-wishbone IFS with coilovers

Improve lateral grip
Decrease roll

Reduce load transfer
-decrease CG
--lower ride height
Current static ground clearance: 6"
Target static ground clearance: 5"

Current static ground clearance of 6" - target static ground clearance of 5" = 1" drop @ wheel * 0.84375 motion ratio = 0.8" @ shock
Current 16" extended shock rides at 15.5" - 0.8" = 14.7" new shock ride

Replacing with a threaded body shock of the same 16" extended length (11" collapsed / 15.87" extended) gives:
15.87" extended - 11" collapsed = 4.87" usable stroke
14.7" - 11" = 3.8" bump / 4.87" usable = 75% bump
15.87" - 14.7" ride target = 1.2" droop / 4.87" usable = 25% droop

Replacing with an 18" shock (12" collapsed / 17.87" extended), travel would be limited by packaging to 17 1/8". However,
17.125" packaging - 12" collapsed = 5.125" usable stroke
14.7" - 12" = 2.7" bump / 5.125" usable = 52% bump
17.125" - 14.7" ride target = 2.5" droop / 5.125" usable = 48% droop

Does that look right?

What would you do for a 100% street performance vehicle: 3.8" bump : 1.2" droop, or 2.7" bump : 2.5" droop?

RE: Lateral grip: Optimize for wheel bump travel or shock stroke?

Running out of travel in compression is a lot worse than running out of travel in extension ...

RE: Lateral grip: Optimize for wheel bump travel or shock stroke?

First thing I'd want is a set of tires with more grip. You can drop the c.g. with a rim change while you are at it.

Get a VBOX and measure some key performance indicators (understeer, steering gain, max lat) and run a constant radius or constant steer test. Results from this will help you gauge your changes even with the tire you have. You might even need more motor to get more grip.

RE: Lateral grip: Optimize for wheel bump travel or shock stroke?

Agree with Brian. Consider adding a soft bump stop as well.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Solutions Brief - Protecting and Rescuing On-Ground Personnel
Keeping our warfighters safe and delivering them a competitive advantage is a key goal of departments of defense around the world. It’s a goal shared by embedded computing manufacturers like Abaco: we never forget who we serve.This case study describes how a major international contractor integrated an Abaco single board computer at the heart of its CAS/CSAR solution. Download Now
Datasheet - Top Enhancements Creo 7.0
PTC's Creo 7.0 has breakthrough innovations in the areas of generative design, real-time simulation, multibody design, additive manufacturing, and more! With Creo 7.0, you will be able to design the most innovative products faster than ever before, keeping you on the cutting edge of product design and ahead of your competition. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close