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Old 04-15-2016, 04:49 PM   #1
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Wider tire question

Ok so this might be a super dumb question. However I just placed new tires and rims on 275/35/18 from my original 235/50/18. My question is will the new tires (wider) increase or decrease my launch time/ and 0-60.

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Old 04-15-2016, 05:37 PM   #2
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It depends on whether you were traction limited with your old tires. You will have much more rubber on the ground now. Are the new tires the same diameter? What is your axle ratio?
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Old 04-15-2016, 05:43 PM   #3
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Yes they are still 18's. I noticed if I'm doing 60mph I'm realistically going 56. I have no idea about the axle.


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Old 04-15-2016, 06:03 PM   #4
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Quote:
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Yes they are still 18's. I noticed if I'm doing 60mph I'm realistically going 56. I have no idea about the axle.

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You changed your "tire" diameter from approx. 27.25 to 25.6. A reduction of 6%., which equates to 3.6 MPH at 60 MPH. That's well beyond the maximum which is typically recommended.
Do you have a manual or auto?
The smaller dia tires does give you a little more torque, similar to "slightly" higher ratio gears.
If you have a base V6 with no gear change, you have 2.73 rear end gears.
Excluding the consideration for traction gains, the weight and diameter of the new rims and tires could make a difference in your 0-60.
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Old 04-15-2016, 06:25 PM   #5
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My 255/45-18 tires on my factory 8 inch wide wheels are almost too wide of a tire. I get more 'tire roll' on hard turns than i want. I might go back to the 235/50-18 size on my next set of tires.


275 width tires on an 8 inch wide wheel will handle very bad when pushed on tight curves.
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Old 04-15-2016, 06:44 PM   #6
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Wider tire question

It's an auto with 3.31 gear ratio


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Old 04-15-2016, 08:34 PM   #7
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It's an auto with 3.31 gear ratio

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As an auto, that's all the more reason you should correct your speedometer.
Not entirely sure how much of an impact it will have on your shifting, the fact that your cars computer thinks the car is traveling 6% faster then it actually is.
The cars computer relies on several sensors to decide when and how to shift.
• Input shaft speed sensor - Engine speed on the transmission side of the torque converter
Output shaft speed sensor - Road speed
• Throttle position - How far the accelerator is pressed
• MAP sensor - Engine intake vacuum, which is a function of throttle position and engine load.
• Temperature - Shift firmness varies based on transmission temperature to account for the fluid's properties over the wide range of operating temperatures.

All I know about your car so far is that it's the Pony Package, has 3.31 gears and some nice looking new wheels and tires.
Should seriously consider correcting your speedometer, either by a Speedometer/Odometer Recalibration Programmer or a Tuner. Of course you run the chance of warranty coverage on anything that the tuner could be blamed for causing.

EDIT: a tuner would definitely improve on your 0-60 time.
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Old 04-16-2016, 12:39 AM   #8
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Yes I have the update for my tunes coming on Monday


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Old 04-16-2016, 04:41 AM   #9
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I read the first post wrong. You got new wheels too . I would bet your 0 to 60 times will go down a tenth of a second or two.
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