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| Dodge Challenger R/T Specific This area is for discussion specific to the Dodge Challenger R/T model. |
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08-15-2008, 07:39 AM
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Re: Who's getting 20" Wheels?
Originally Posted by HOPHEAD
Thats what i thought. After some good research i found that performance wise the 20's netted you very little over the 18's in the Challengers case. I went with the 18's because the 20's looked TOO 21st century for this car. Probably ok for a new Camaro imo.
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08-15-2008, 01:38 PM
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Re: Who's getting 20" Wheels?
Originally Posted by HOPHEAD
The rim size is bigger, but not the overall tire diameter. It remains basically the same. So you will see some gain. They add the 3.91 gears to the added strain of the 20's off of the tranny and put it on the rear axle.
They did the same in the ram trucks
__________________
 SOLD  Car: 2006 Dodge Charger SRT8Performance Mods: SLP Long Tube Headers, Cat Deletes, Magnaflow Catback, PPP Stage 2 Heads, PPP Track Warrior Cam, Diablo Predator with a custom tune. 
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08-15-2008, 02:08 PM
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Re: Who's getting 20" Wheels?
The tire size used on the 20"s is about .58 inches taller than the tires they are using the on 18" wheels.
The 235/55-18's are about 28.1 inches high. The 245/45-20's are 28.68 inches high. That .58 inches in taller tire height negates the use of the shorter gears in the 20" application.
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08-15-2008, 10:26 PM
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Re: Who's getting 20" Wheels?
If i'm correct, you get the better/bigger brakes with the 20 inch wheels as well. It's nice to see a 3.91 available, kinda like old days...
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08-20-2008, 01:55 PM
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Re: Who's getting 20" Wheels?
I got the 20" because of the look of the rims, I do not like the look of the 18's. I prefer the heritage rims the best but as I didn't want to wait, I went with the 20's.
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08-20-2008, 02:01 PM
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Re: Who's getting 20" Wheels?
Originally Posted by HOPHEAD
i had an excell program written out to figure all of that up at some point. Ill have to find it again. But basically you can put in two gear sizes and wheel sizes, then it would ouput the difference in speed at a given rpm, or difference in rpms at a given speed. 1/2" isnt much coming off the line but at higher speeds it would definately show up on the speedometer
__________________
SOLD Car: 2006 Dodge Charger SRT8Performance Mods: SLP Long Tube Headers, Cat Deletes, Magnaflow Catback, PPP Stage 2 Heads, PPP Track Warrior Cam, Diablo Predator with a custom tune.
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08-20-2008, 02:03 PM
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Re: Who's getting 20" Wheels?
Originally Posted by stonewhiteRT
the bigger brakes would be worth it alone. what is the cost of the 20"s? $1200 or so?
__________________
SOLD Car: 2006 Dodge Charger SRT8Performance Mods: SLP Long Tube Headers, Cat Deletes, Magnaflow Catback, PPP Stage 2 Heads, PPP Track Warrior Cam, Diablo Predator with a custom tune.
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08-20-2008, 02:38 PM
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Re: Who's getting 20" Wheels?
Here is some information courtesy of a neat program called GearCalc. I punched in all the gear information available at allpar.com and used tire sizes from dodge.com and this is what came up.
Information for '09 R/T w/18" wheels (3.73) Code:
Gear Mph per 1000 RPM Mph @5800 RPM
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1 7.57 44
2 10.70 62
3 15.39 89
4 22.48 130
5 30.37 176
6 44.95 261
Mph RPM (in Gears)
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1 2 3 4 5 6
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5 661 467 325 222 165 111
10 1321 934 650 445 329 222
15 1982 1401 974 667 494 334
20 2643 1869 1299 890 658 445
25 3304 2336 1624 1112 823 556
30 3964 2803 1949 1335 988 667
35 4625 3270 2274 1557 1152 779
40 5286 3737 2598 1780 1317 890
45 4204 2923 2002 1482 1001
50 4672 3248 2225 1646 1112
55 5139 3573 2447 1811 1224
60 5606 3897 2670 1975 1335
65 4222 2892 2140 1446
70 4547 3114 2305 1557
75 4872 3337 2469 1668
80 5197 3559 2634 1780
85 5521 3782 2799 1891
90 4004 2963 2002
95 4227 3128 2113
100 4449 3292 2225
105 4672 3457 2336
110 4894 3622 2447
115 5117 3786 2558
120 5339 3951 2670
125 5561 4116 2781
130 5784 4280 2892
135 4445 3003
140 4609 3114
145 4774 3226
150 4939 3337
155 5103 3448
160 5268 3559
165 5432 3671
170 5597 3782
175 5762 3893
180 4004
185 4116
190 4227
195 4338
200 4449
205 4560
210 4672
215 4783
220 4894
225 5005
230 5117
235 5228
240 5339
245 5450
250 5561
255 5673
260 5784
Gear Change RPM drop (change @5800)
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1 -> 2 -1699 (to 4101)
2 -> 3 -1768 (to 4032)
3 -> 4 -1827 (to 3973)
4 -> 5 -1508 (to 4292)
5 -> 6 -1881 (to 3919)
Code:
Gear Mph per 1000 RPM Mph @5800 RPM
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1 7.35 43
2 10.39 60
3 14.95 87
4 21.82 127
5 29.49 171
6 43.64 253
Mph RPM (in Gears)
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1 2 3 4 5 6
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5 681 481 335 229 170 115
10 1361 962 669 458 339 229
15 2042 1444 1004 687 509 344
20 2722 1925 1338 917 678 458
25 3403 2406 1673 1146 848 573
30 4083 2887 2007 1375 1017 687
35 4764 3368 2342 1604 1187 802
40 5444 3849 2676 1833 1356 917
45 4331 3011 2062 1526 1031
50 4812 3345 2291 1696 1146
55 5293 3680 2520 1865 1260
60 5774 4014 2750 2035 1375
65 4349 2979 2204 1489
70 4683 3208 2374 1604
75 5018 3437 2543 1718
80 5352 3666 2713 1833
85 5687 3895 2882 1948
90 4124 3052 2062
95 4353 3222 2177
100 4583 3391 2291
105 4812 3561 2406
110 5041 3730 2520
115 5270 3900 2635
120 5499 4069 2750
125 5728 4239 2864
130 4408 2979
135 4578 3093
140 4748 3208
145 4917 3322
150 5087 3437
155 5256 3552
160 5426 3666
165 5595 3781
170 5765 3895
175 4010
180 4124
185 4239
190 4353
195 4468
200 4583
205 4697
210 4812
215 4926
220 5041
225 5155
230 5270
235 5385
240 5499
245 5614
250 5728
Gear Change RPM drop (change @5800)
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1 -> 2 -1699 (to 4101)
2 -> 3 -1768 (to 4032)
3 -> 4 -1827 (to 3973)
4 -> 5 -1508 (to 4292)
5 -> 6 -1881 (to 3919)
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08-20-2008, 10:53 PM
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Re: Who's getting 20" Wheels?
I personally plan on using the SRT8 wheels if I can find some second-hand. I don't want the R/T 20's. They look..exactly like the 18"s, plus 2 inches. :P No style.
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08-21-2008, 07:55 AM
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Re: Who's getting 20" Wheels?
I agree. I am not a big fan of the available wheels for the R/T and I am not usually one to put aftermarket wheels on my cars.
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