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Much slower after 275/55R20

3K views 12 replies 6 participants last post by  Mininuke 
#1 · (Edited)
Hi all,

Just wondering if any of you with bigger tires, 275/55R20, experienced a significant difference in acceleration.

My 2013, 3.6 AWD, is now 3.3 seconds slower to 60 than stock. I am running Diablosport/hemifever 87 tune, AEM drop in filter and Gibson axle back (single side). Before this mods it felt slower than now. So they definitely helped.

On a previous post I commented on this and agreed that the bigger tires and higher altitude (4,000 ft.) affects power and speed but I'm not sure it can add 3.3 seconds to a 0 to 60 run.

What is your experience after installing 275/55R20 tires?

Thoughts?
 
#3 ·
I should have mentioned that I calibrated my speedometer with the Diablosport. Verified with GPS.
 
#5 ·
Own recorded times.

8.5 seconds, @ sea level, calm wind, 65 degrees, 2 years ago.
12.8 seconds, 4019 ft, elevation, 84 degrees, very strong wind, yesterday.
 
#9 · (Edited)
I know this doesn't really help the OP but before I bought my Hemi, I was wondering if the 3.45:1 gears in the 3.6L would work in the Hemi differential (Hemi 3.09:1)?

and I think the SRT has 3.70:1 gears, if you could get the SRT gears you might be able to recover some of your lost acceleration but at the expense for fuel economy and top speed.
 
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