Light weight wheel performance?
10-18-2004, 08:07 AM
#26
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Richard Paul wrote: Think about it this way. We hear all the praise for the effects of the light flywheels. The wheels have the same effect, after all they are attached to the crankshaft also.
10-18-2004, 08:10 AM
#27
Addtional information. He also did a comparison between rx7 FD rims (16x8) and the Rx8 rims (18x8) between two runs on the drag strip.
With the Rx8 rims [48 lbs] (225/45/18 Stock rubber) he ran a 17.2 in the 1/4 (6i ATX)
With the FD Rx7 rims [34 lbs] (225/50/16 Toyo Trampios (old tire)) he ran a 16.690 in the 1/4 (6i ATX).
Because this was an ATX, its a bit easier to see some consistency between runs. So there ya go, thats about 70 cases of evidence for lightweight tires/rims, with everything from braking performance, to handling, to acceleration benefits in 0-60, 1/4 mile, and track times.
With the Rx8 rims [48 lbs] (225/45/18 Stock rubber) he ran a 17.2 in the 1/4 (6i ATX)
With the FD Rx7 rims [34 lbs] (225/50/16 Toyo Trampios (old tire)) he ran a 16.690 in the 1/4 (6i ATX).
Because this was an ATX, its a bit easier to see some consistency between runs. So there ya go, thats about 70 cases of evidence for lightweight tires/rims, with everything from braking performance, to handling, to acceleration benefits in 0-60, 1/4 mile, and track times.
10-18-2004, 09:45 AM
#28
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Originally Posted by crossbow
That should keep you extremely busy for awhile. Honestly though, pile all the articles and facts in front of someone...and they'll still deny it. Let them drive the same car, with lighter wheels/tires then theirs, and they'll swap sides instantly. Its that big a difference. Do realize that starting a debate on this subject will result in a massive firestorm of flaming and yelling, as large diameter wheels carry a heavy financial and emotional burden for their owners, who will defend them to the last man.
Great info crossbow! Thanks for posting these, they are ALL very interesting reading.
10-19-2004, 04:00 PM
#29
Otaking posted his time slips with a detailed explanation of the testing for those interested. (The 1/4 mile times with rx8 18's (stock rubber), and FD rx7 16 rims).
http://forum.mazda6tech.com/viewtopi...762&highlight=
Whats most interesting about this comparison...is that the rx8 rubber has far superior grip to the tires on the FD rims.
http://forum.mazda6tech.com/viewtopi...762&highlight=
Whats most interesting about this comparison...is that the rx8 rubber has far superior grip to the tires on the FD rims.
Last edited by crossbow; 10-19-2004 at 04:23 PM.
10-19-2004, 06:36 PM
#30
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Originally Posted by crossbow
Otaking posted his time slips with a detailed explanation of the testing for those interested. (The 1/4 mile times with rx8 18's (stock rubber), and FD rx7 16 rims).
http://forum.mazda6tech.com/viewtopi...762&highlight=
Whats most interesting about this comparison...is that the rx8 rubber has far superior grip to the tires on the FD rims.
http://forum.mazda6tech.com/viewtopi...762&highlight=
Whats most interesting about this comparison...is that the rx8 rubber has far superior grip to the tires on the FD rims.
the tire diameters are different - thus effecting the gear ratios and giving better performance.
10-19-2004, 09:16 PM
#31
Of course...but 0.5 seconds in the 1/4 is a lifetime. I'd agree with you if the difference was only a tenth....but the overall diameter difference is only 4.3%...which points out that a large % of the gain is from the substaintal loss in unsprung weight.
Even if you said 0.3 of the seconds was from gearing, and 0.2 was from the wheel weight...thats still a rediculous amount.
0.2 in a 1/4 = loss of 200 lbs, or addition of 30 hp in a 3000 lb vehicle.
Even if you said 0.3 of the seconds was from gearing, and 0.2 was from the wheel weight...thats still a rediculous amount.
0.2 in a 1/4 = loss of 200 lbs, or addition of 30 hp in a 3000 lb vehicle.
Last edited by crossbow; 10-19-2004 at 09:22 PM.
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