11-20-2011, 12:14 PM
|
#11 (permalink)
|
|
Master EcoModder
Join Date: Nov 2010
Location: Atlanta
Posts: 403
Thanks: 1
Thanked 37 Times in 28 Posts
|
It would interesting to do a city route then a highway route with the donuts at 70 psi vs the Stones at 51. I would be willing to bet that based on your previous experiences with donuts that they would shine bright on the highway route based on lower aero drag and the stones might, or not, shine on the city route.
Seems like a load rating/aero drag compromise is what we are looking at.
If so, then the skinniest tire (preferably tall) with a high load rating is what we are after for overall performance.
__________________
This ain't a war, anymore than a war between men and maggots. Or, dragons and wolves. Or, men riding dragons, throwing wolves at maggots!
|
|
|
|
 Today
|
|
|
|
Other popular topics in this forum...
|
|
|
|
|
11-20-2011, 02:57 PM
|
#12 (permalink)
|
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
|
FYI, I just happened to calculate the "real world" (ie. not scientific) impact of switching to the RE92 tires on the ForkenSwift:
- 345 Wh/mi ... 10 drive/charge cycles before switching tires
- 285 Wh/mi ... 10 drive/charge cycles since switching tires
That's a 21% increase in range. (Or a decrease in battery discharge for the same distance driven, with associated benefits to pack life.)
FYI, I'm not actually planning any more tire tests. I will just aim to use RE92's wherever I can on the Suzukiclone fleet.
Also, for a pile of reasons, I am DEFINITELY NOT suggesting that other people will see anything close to this efficiency increase if they switch to these tires. |
|
|
|
|
11-20-2011, 03:56 PM
|
#13 (permalink)
|
|
Master EcoModder
Join Date: Nov 2010
Location: Atlanta
Posts: 403
Thanks: 1
Thanked 37 Times in 28 Posts
|
What's the weight of that vehicle?
What's the load rating on the RE92's vs the donuts?
__________________
This ain't a war, anymore than a war between men and maggots. Or, dragons and wolves. Or, men riding dragons, throwing wolves at maggots!
|
|
|
|
|
11-20-2011, 06:38 PM
|
#14 (permalink)
|
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
|
ForkenSwift: 2070 lbs
RE92 Max Load: 937 lbs.
Donuts max load: 1025 lbs.
|
|
|
|
|
11-21-2011, 04:13 PM
|
#15 (permalink)
|
|
Master EcoModder
Join Date: Nov 2010
Location: Atlanta
Posts: 403
Thanks: 1
Thanked 37 Times in 28 Posts
|
I lost that bet. Could have swore the RE's would've had a better load rating.
So why are the RE's better? This is the burning question as we have been sold on load rating for RR (according to most test data) and your results lean away from that.
Or is it a case of psi (weight of each corner of car) acting upon the pavement?
__________________
This ain't a war, anymore than a war between men and maggots. Or, dragons and wolves. Or, men riding dragons, throwing wolves at maggots!
|
|
|
|
|
11-22-2011, 02:10 AM
|
#16 (permalink)
|
|
EcoModding Apprentice
Join Date: Oct 2011
Location: Sacramento, CA
Posts: 152
Thanks: 15
Thanked 34 Times in 25 Posts
|
Quote:
Originally Posted by BHarvey
I lost that bet. Could have swore the RE's would've had a better load rating.
So why are the RE's better? This is the burning question as we have been sold on load rating for RR (according to most test data) and your results lean away from that.
Or is it a case of psi (weight of each corner of car) acting upon the pavement?
|
Construction materials would be my first guess. Higher silica content, orange peel oil or what have you. Load is not the only factor that determines RR.  |
|
|
|
|
11-22-2011, 08:18 AM
|
#17 (permalink)
|
|
Tire Geek
Join Date: May 2008
Location: Let's just say I'm in the US
Posts: 796
Thanks: 4
Thanked 393 Times in 240 Posts
|
Quote:
Originally Posted by F8L
Construction materials would be my first guess. Higher silica content, orange peel oil or what have you. Load is not the only factor that determines RR. |
As a matter of fact, load rating is a minor player compared to the differences in tread compound - which, of course, varies considerably from tire to tire. |
|
|
|
|
The Following User Says Thank You to CapriRacer For This Useful Post:
|
|
|
12-27-2011, 11:15 AM
|
#18 (permalink)
|
|
EcoModding Lurker
Join Date: Dec 2011
Location: usa
Posts: 92
Thanks: 1
Thanked 2 Times in 1 Post
|
I did a search to see the availability of these bridgestone potenza RE92's. I see they are available everywhere, new and used. However I don't see this tire being advertized as a low RR. What's up with that? All they advertize about it is that its popular cuz it came stock with toyota camrys and other vehicles.
Could it be the bridgestone potenza RE92's that I see for sale at all these online tire places is not the same tire as the ones used in the OP's tests?
Just type "bridgestone potenza RE92" into google and u get a whole bunch of vendors advertizing these tires. Not one of them mentions low rr
What's up with that?
|
|
|
|
|
12-27-2011, 02:46 PM
|
#19 (permalink)
|
|
Batman Junior
Join Date: Nov 2007
Location: 1000 Islands, Ontario, Canada
Posts: 22,527
Thanks: 4,078
Thanked 6,976 Times in 3,612 Posts
|
Quote:
Originally Posted by mans
Could it be the bridgestone potenza RE92's that I see for sale at all these online tire places is not the same tire as the ones used in the OP's tests?
|
You are correct.
The size (165/65 R14) of RE92 made for the first gen. Insight is definitely LRR, and is unlike the other RE92 sizes available.
If you view the listing at Tire Rack for the Insight sized RE92, it identifies that size as Low Rolling Resistance.
But if you view the 185/60 R15 size of that tire (I picked that one at random), it does not list it as LRR. |
|
|
|
|
12-27-2011, 03:32 PM
|
#20 (permalink)
|
|
Master EcoModder
Join Date: Jan 2008
Location: Western Wisconsin
Posts: 3,903
Thanks: 867
Thanked 434 Times in 354 Posts
|
Quote:
Originally Posted by mans
Just type "bridgestone potenza RE92" into google and u get a whole bunch of vendors advertizing these tires. Not one of them mentions low rr
What's up with that?
|
The only size that is LRR is 165/65R14 that came stock on the 2000 to 2007 Honda Insight and from what I remember people claim a 4 to 7mpg affect from using these tires, in other sizes of tires there are brands that have LRR models as well but most of them span most if not all of their sizes in that model.
|
|
|
|
|
