Going from 18's to 20's means.......
03-26-2008, 07:36 PM
#31
5th Gear Member
Join Date: Jul 2007
Location: TX
Posts: 4,897
RE: Going from 18's to 20's means.......
I can't exactly recall what I entered for rpms/mile but my dyno tuner DEFINITELY got it wrong. I was 2-5mph off. I had to recalibrate (hence a new tune) which really pissed me off.
I'll have to check what I have in my canned SCT tune for revolutions per mile...
I'll have to check what I have in my canned SCT tune for revolutions per mile...
03-26-2008, 07:37 PM
#32
2nd Gear Member
Join Date: Feb 2008
Location:
Posts: 246
RE: Going from 18's to 20's means.......
ORIGINAL: marcuskeeler
That's not whatI meant.If you drive at 60mph by the speedo you'll actually be travelling slower because you have smaller wheels !
Wrong. smaller tire= faster rotation= speedo will read faster. Your so concerned with everyones spelling that you overlooked common sense.
Lol too late Marcus your actual post will live forever in my post...
03-26-2008, 07:48 PM
#36
2nd Gear Member
Join Date: Feb 2008
Location:
Posts: 246
RE: Going from 18's to 20's means.......
ORIGINAL: marcuskeeler
shhh, my edit is timed 2 mins before your post
shhh, my edit is timed 2 mins before your post
03-26-2008, 07:51 PM
#37
5th Gear Member
Join Date: Aug 2006
Location: Near Wash. DC Posts: 13,541
Posts: 2,497
RE: Going from 18's to 20's means.......
a heavier wheel has more interia, and because of that more interia gets lost to wind resistance and road resistance as a percentage. If the wheel has more energy in it at speed, it will proprtionally lose that energy at speed, not gain it at all.
Also the distance the weight is from the center plays a huge part, really the little things add up here. 1mpg isn't bad.
Also the distance the weight is from the center plays a huge part, really the little things add up here. 1mpg isn't bad.
03-26-2008, 07:58 PM
#38
2nd Gear Member
Join Date: Feb 2008
Location:
Posts: 246
RE: Going from 18's to 20's means.......
http://www.blackstonetek.com/proudly_sa.htm
this kinda gives you the jist of inertias impact on a wheel.
this kinda gives you the jist of inertias impact on a wheel.
03-26-2008, 08:02 PM
#39
6th Gear Member
Join Date: Apr 2007
Location:
Posts: 6,414
RE: Going from 18's to 20's means.......
ORIGINAL: Legion5
a heavier wheel has more interia, and because of that more interia gets lost to wind resistance and road resistance as a percentage. If the wheel has more energy in it at speed, it will proprtionally lose that energy at speed, not gain it at all.
Also the distance the weight is from the center plays a huge part, really the little things add up here. 1mpg isn't bad.
a heavier wheel has more interia, and because of that more interia gets lost to wind resistance and road resistance as a percentage. If the wheel has more energy in it at speed, it will proprtionally lose that energy at speed, not gain it at all.
Also the distance the weight is from the center plays a huge part, really the little things add up here. 1mpg isn't bad.
