Thread: tire diameter
View Single Post
Old 09-21-2008, 03:47 PM   #39 (permalink)
guitarterry
EcoModding Lurker
 
Join Date: Apr 2008
Location: Kampsville
Posts: 77

stinky - '97 geo metro lsi
90 day: 44.71 mpg (US)
Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by Blue Bomber Man View Post
Because only about 20% of a vehicles energy actually makes it to the wheels at highway speeds a lower RRC is still more valuable than improved gearing.

A 10% increase (in efficiency) at the engine only results in a 2% mpg gain.

However, like I said, the best tire I've seen so far is in fact a 14" wheel, so you would do well to work with that if you car's rims can take it, and then modifiy your transmission or final gear to gain any engine efficiencies through rpms
wow so u know the 14 inch out performs the 13 or 12. even if the engine effiencies are taken OUT of the equation thru gearing. (please, why are u going on a gearing tangent, the idea is the engine will be turning the same.) I thought u just said that aero was more important than LRR at speeds over 20 mph. Plus as right of right now i dont know the LRR of the 12 or 13.
  Reply With Quote