Re: First Autox with my Dart
[Re: Uhcoog1]
#1881777
07/30/15 09:55 PM
07/30/15 09:55 PM
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Joined: Nov 2004
Posts: 25,050 Texas
GoodysGotaCuda
5.7L Hemi, 6spd
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5.7L Hemi, 6spd
Joined: Nov 2004
Posts: 25,050
Texas
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Mine seems to like full stiff on both sway bars as well. I used 275 RE71R front and 315 Rival S rear last month. Then Switched to 275 RE71R F&R last Sunday. 275 RE71R all around was faster... 18x10.5 Front and rear. This- any speculation to why it was faster? Very interesting. Being able to retain and build more heat in the rear 275s might have contributed. Gotta keep the tire hot, but not too hot and over-saturate it. Also in autocross it is imperative to build heat in the tires as quickly as possible since the runs are so short. A big cold tire will usually not perform as well as a smaller, warmed up tire.
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Re: First Autox with my Dart
[Re: 72Swinger]
#1881802
07/30/15 10:26 PM
07/30/15 10:26 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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I would agree with this, my rears were not helping until the 4th run. Then it shat and gat...
Mopar to the bone!!!
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Re: First Autox with my Dart
[Re: 72Swinger]
#1881812
07/30/15 10:41 PM
07/30/15 10:41 PM
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Joined: Oct 2013
Posts: 380 Escondido CA USA
Tomswheels
enthusiast
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enthusiast
Joined: Oct 2013
Posts: 380
Escondido CA USA
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I think it was two main things, the feel of the 275 RE-71Rs , and this seems to be agreed upon by all who have tried them, is amazingly direct. No squirm like I experienced in both the Rival and the Falkens. Part of that feel may have been the 275 on a 10.5 inch rim vs the Rival 315 on a 10.5 inch rim, but it may also just be the tires personality. The other reason is compound. The RE71R is softer, even though both are rated at 200 TW. I see more wear on the RE71R than the Rival. Oh and both these tires felt pretty darn good hot or cold...
Last edited by Tomswheels; 07/30/15 10:44 PM.
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Re: First Autox with my Dart
[Re: 72Swinger]
#1882088
07/31/15 11:00 AM
07/31/15 11:00 AM
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Joined: May 2005
Posts: 723 Houston Tx
Uhcoog1
super stock
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super stock
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Houston Tx
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Makes sense.
Yeah I'm currently opening up the rear tubs 1.5" (on the outside) to fit wider tires. Just wondering if I'm wasting my time! Ha. 275's square have done well on the car, though looking forward to trying more tire. I should have some data from the road course come this fall.
-'02 Dodge Viper Ex-World Challenge racecar -'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: First Autox with my Dart
[Re: Tomswheels]
#1882135
07/31/15 12:12 PM
07/31/15 12:12 PM
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Joined: Jan 2010
Posts: 1,442 NW Chicago suburban area
Mopar Mitch
pro stock
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pro stock
Joined: Jan 2010
Posts: 1,442
NW Chicago suburban area
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Tom -- another reason why the difference in performance with the 315s in the rear... vs a square setup (275x4)... could be that the 315s are a touch taller in diameter.. thus shifting a bit of weight towards the front of the car (changing the balance that you're used to)... and actually changing the alignment slightly by reducing the positive caster (having taller rear tires lifting the rear).. from whatever/whenever you had it aligned at. When you had the alignment done, did it have a square tire setup? (all 4 tires the same size/diameter?)
Mopar Mitch
"Road racers and autocrossers go in deeper and come out harder!"... and rain never stops us from having fun with our cars... in fact, it makes us better drivers!
Check out MOPAR ACTION MAGAZINE, August 2006 issue for feature article and specs on my autocross T/A!
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Re: First Autox with my Dart
[Re: 72Swinger]
#1882167
07/31/15 01:06 PM
07/31/15 01:06 PM
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Joined: Oct 2013
Posts: 380 Escondido CA USA
Tomswheels
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enthusiast
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Posts: 380
Escondido CA USA
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Mitch, could be, although I lowered the rear an inch right when I tried these two sets. The 315 Rival S just didn't feel as glued down in the rear, the front felt good (with the Bridgestones). When I had the alignment done I actually had an even taller rear tire, the 305/30/19 Hankook. Wade I think right now with the current crop of 200TW tires you don't need wider than the 275 RE71R, but this tire war will do nothing but escalate. Someone is bound to bring out a wider super sticky tire. If I were to build a car from scratch I'd aim for a 18x11.5 315 front and a 18x13 335 rear, and I'd run the Rival S on it for now...
Last edited by Tomswheels; 07/31/15 01:11 PM.
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Re: First Autox with my Dart
[Re: 72Swinger]
#1882217
07/31/15 02:01 PM
07/31/15 02:01 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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The RE71R's must warm up in the first turn basically. Autox and Road course duty are different requirements for a tire, that is for sure. Rivals may be a better "overall" tire in that dept.
Mopar to the bone!!!
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Re: First Autox with my Dart
[Re: Tomswheels]
#1882367
07/31/15 05:41 PM
07/31/15 05:41 PM
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Joined: May 2005
Posts: 723 Houston Tx
Uhcoog1
super stock
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super stock
Joined: May 2005
Posts: 723
Houston Tx
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Wade I think right now with the current crop of 200TW tires you don't need wider than the 275 RE71R, but this tire war will do nothing but escalate. Someone is bound to bring out a wider super sticky tire. If I were to build a car from scratch I'd aim for a 18x11.5 315 front and a 18x13 335 rear, and I'd run the Rival S on it for now...
Any reports yet on how the RE71R hold up on the road course? Sounds like a great autocross tire, just curious how they hold up with more heat. The current tub work should clear 305/30/19's or maybe 315/30/18's, but no more. My 'goal' is to stay square (or as close to it as I can). We'll see what the front will do after I try your bottle jack mod . I need to sell some of these 18x9.5's and start looking for some 18x11's and 19x11's. You mentioned 18x11.5's for 315s- any specific reason? Looks like the 'measured width' wheel is 18x11 - just curious if you had a reason. Tom- what's your current 200+ tw tire ranking now? Guess: RE71R Rival S RS-3 Star Spec ... ... ... ... super sport ?
-'02 Dodge Viper Ex-World Challenge racecar -'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: First Autox with my Dart
[Re: 72Swinger]
#1882369
07/31/15 05:45 PM
07/31/15 05:45 PM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Wade send me some pics of you wheel stock, you can currently get a 285/35/18 in RS3 V2's. I could rock that as a square setup on 9.5's...
Mopar to the bone!!!
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Re: First Autox with my Dart
[Re: 72Swinger]
#1882547
07/31/15 11:12 PM
07/31/15 11:12 PM
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Joined: May 2005
Posts: 723 Houston Tx
Uhcoog1
super stock
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super stock
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Houston Tx
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Thanks for the info, Tom.
Emil- 2 sets of gt500 wheels. 18x9.5 +45mm 1 set of enkei pf01's. 18x9.5 +38mm
-'02 Dodge Viper Ex-World Challenge racecar -'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: First Autox with my Dart
[Re: buconine]
#1882693
08/01/15 02:57 AM
08/01/15 02:57 AM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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Wow, hyundai is proud of those kits. $242 seems like a lot to me for what it is. I've always put them on under warranty so i never looked at the price. .. zoiks! Thanks Chris for trying, I have an old Fram canister fuel filter I'm gonna rig up.
Mopar to the bone!!!
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Re: First Autox with my Dart
[Re: 72Swinger]
#1882753
08/01/15 10:04 AM
08/01/15 10:04 AM
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Joined: May 2005
Posts: 723 Houston Tx
Uhcoog1
super stock
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super stock
Joined: May 2005
Posts: 723
Houston Tx
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For a rear end breather? I run this one from Art Morrison. $45. http://www.artmorrison.com/layout.php?y=store/&x=new
Last edited by Uhcoog1; 08/01/15 10:04 AM.
-'02 Dodge Viper Ex-World Challenge racecar -'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course
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Re: First Autox with my Dart
[Re: 72Swinger]
#1889302
08/11/15 03:47 AM
08/11/15 03:47 AM
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Joined: Feb 2011
Posts: 4,302 Nebraska
72Swinger
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I would have but my rear tires are 100AA. My front are 300AA NT555's but 300-100 doesn't get you in a 200AA tire class lol. My times are what they are no matter the class anyway. I plan to have CAM legal rubber next year and I will be back. Plus I have a fueling problem that raised its head that day and comes and goes ever since, its either the pump,relay or both.
Mopar to the bone!!!
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