Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-01-2022, 04:49 AM   #11 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 4,810

ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.26 mpg (US)

Work Vehicle - '17 Toyota RAV4
90 day: 31.42 mpg (US)
Thanks: 2,690
Thanked 2,369 Times in 1,467 Posts
The only piece I'd add to this is, I'm often taking corners at the very limit of grip. Having some negative camber likely evens out tire wear, but I don't have a baseline yet. I suppose if I lose some rear-end traction from having zero toe in at the back, I'll simply scale back the speed around corners slightly, and it'll be fine, but I'm a little wary of making the car too tail-happy. The compromise for being able to set the rear toe to zero might be a little more rear camber than front, and/or a stiffer front sway bar, so the rear is less likely to get out from under me.


Last edited by Ecky; 10-01-2022 at 04:58 AM..
  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-01-2022, 09:15 AM   #12 (permalink)
Tire Geek
 
CapriRacer's Avatar
 
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 775
Thanks: 3
Thanked 360 Times in 224 Posts
Quote:
Originally Posted by freebeard View Post
.... Farm tractors have massive positive front camber. I guess it makes for straighter furrows?
They do that so that the footprint of the front tires is small and can fit in a furrow. The alternative is to space out the front axle so each is in its own furrow.
__________________
CapriRacer

Visit my website: www.BarrysTireTech.com
  Reply With Quote
The Following User Says Thank You to CapriRacer For This Useful Post:
freebeard (10-01-2022)
Old 10-01-2022, 02:43 PM   #13 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 24,345
Thanks: 6,869
Thanked 7,743 Times in 6,332 Posts
So, like a slot racer then?
__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________

"Stuff just keeps on getting older...." -- Graham Hancock

____________________
  Reply With Quote
Old 10-01-2022, 03:42 PM   #14 (permalink)
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 4,810

ND Miata - '15 Mazda MX-5 Special Package
90 day: 39.26 mpg (US)

Work Vehicle - '17 Toyota RAV4
90 day: 31.42 mpg (US)
Thanks: 2,690
Thanked 2,369 Times in 1,467 Posts
Quote:
Originally Posted by CapriRacer View Post
Toe in is stable, toe out is unstable (the vehicle can't figure out which side to follow).

On solid rear axles, toe isn't a problem because it is very close to zero.

Camber tends to cause good cornering, but at the expensive of tire wear. So it is very important to get the toe very close to the target value if you want good tire wear.
And what would you say the target value should be, to keep tire wear low, accounting for dynamic loads and rubber bushings that deflect?
  Reply With Quote
Old 10-01-2022, 04:32 PM   #15 (permalink)
Master EcoModder
 
freebeard's Avatar
 
Join Date: Aug 2012
Location: northwest of normal
Posts: 24,345
Thanks: 6,869
Thanked 7,743 Times in 6,332 Posts
That wold be case dependent, varying with suspension geometry and [possibly] roll center height.

Solid vs trailing arms vs A-arms; anti-dive and anti-squat; and &tc.
__________________
.
.

Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
____________________

"Stuff just keeps on getting older...." -- Graham Hancock

____________________
  Reply With Quote
Old 10-02-2022, 11:04 AM   #16 (permalink)
Tire Geek
 
CapriRacer's Avatar
 
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 775
Thanks: 3
Thanked 360 Times in 224 Posts
Quote:
Originally Posted by Ecky View Post
And what would you say the target value should be, to keep tire wear low, accounting for dynamic loads and rubber bushings that deflect?
Go by the vehicle manufacturer's published target values for toe. Ignore the tolerance - or at least divide the range by half!

__________________
CapriRacer

Visit my website: www.BarrysTireTech.com
  Reply With Quote
Reply  Post New Thread


Thread Tools




Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2022, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com