Rubi 32s on Sport S with 3.21 Axle-extra strain on Pentastar?
08-22-2012, 09:59 AM
#11
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I just did this exact same thing this very morning! Discount Tire hooked up the BFG MTs (like a stick Rubi) in place of my stock SRAs. I have 3.21s (settled b/c Jeep was on the lot and had half doors!).
Only driven it 25 miles, but doesn't feel any different other than what you'd expect between a road tire and an MT.
It looks killer! And just the right set up for my off road needs.
Only driven it 25 miles, but doesn't feel any different other than what you'd expect between a road tire and an MT.
It looks killer! And just the right set up for my off road needs.
I'm stoked about the rubi suspension and 32 inchers. Just wanted to make sure the 3.21 Gearing doesn't put extra strain on the engine, that's all!
I can't wait to shove this guy in the mud!
....and also can't wait to pull off those damn pipe running boards....so ugly lol!
08-22-2012, 10:24 AM
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33 Falken Wild Peaks
I just took off the 255/75/17 SRAs on my Sport S and put on 285/70/17 Falken wild peaks, with 3:21 gears only time I feel the difference is going up a long hill climb, nut with the Penstar theres plenty of power to keepem rollin
08-22-2012, 03:56 PM
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Originally Posted by SabFanInked84
I'm getting mine on Friday, they're prepping it up for me.
I'm stoked about the rubi suspension and 32 inchers. Just wanted to make sure the 3.21 Gearing doesn't put extra strain on the engine, that's all!
I can't wait to shove this guy in the mud!
....and also can't wait to pull off those damn pipe running boards....so ugly lol!
08-22-2012, 06:44 PM
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Ratios
I also upgraded my Sport (B) to a Rubi off take set. I knew I was going to so I up'd my gear ratio when I ordered it. So it is a little different setup from yours but the higher gear ratio with the tiny stock tires (before I swapped) did not feel right with my 6 sp manual. Shift points just didn't feel right. I was relieved everything felt great once I switched but it emphasized the importance of the right gearing for the tire size. It sounds from other comments like you're good fortunately...
JJ
JJ
08-22-2012, 06:54 PM
#17
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I bought the 2011 sport s 6 speed with 3.21 gears and 32' rubi take offs. Its fine, plenty of torque to move it around. Just feels kind of like your driving a tractor! Lol. I would love to test out the new pentastar engine though to see how much of a difference there is!
08-22-2012, 11:11 PM
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I may be totally retarded...but I'm wondering if this Rear Axle ratio would put a strain on the already "Touchy" Pentastar. Just wondering if it would be wise to re-gear to 3.73.
I bought the car from the dealer inventory, so I didn't have any say on the options. If I could, I would have gotten 3.73.
How much of an impact would this really have on the motor strain at lower gear, since the torque seems to peak at higher RPM on this engine?
Cheers!
I bought the car from the dealer inventory, so I didn't have any say on the options. If I could, I would have gotten 3.73.
How much of an impact would this really have on the motor strain at lower gear, since the torque seems to peak at higher RPM on this engine?
Cheers!
Dude you'll be fine i went through the same dilemma, I went ahead with 285/70/17's only to be pleasanty surprised with no change in performance. Still plenty of power to pass on the highway at 110 kms. The extra inch in height and width from factory 255/70/18 was barely noticeable in fuel consumption too.
Only suggestion is to find rims with proper backspace.
