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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Tire size vs power/torque



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      02-16-2012, 05:04 PM   #1
99three
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Tire size vs power/torque

Would having a 275/30 19 vs a 265/30 19 affect the torque/power so much to actually lose torque? I am having this discussion with a tire vendor who insists that a 275 will lose approximately 3%. On a 400whp that equates to 12whp. I always thought it was a good idea to go with a wider footprint but if it's that taxing I'd opt for more power to the ground. Thoughts?
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      02-16-2012, 05:09 PM   #2
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Negligible difference. On a motorcycle it would matter.
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      02-16-2012, 05:12 PM   #3
99three
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My thoughts exactly. My take is that LSD will also negate the loss of torque.
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      02-16-2012, 05:16 PM   #4
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What it comes down to is it does affect the torque applied to the ground thrpugh gear ratios and torque multiplication..if you look at the discussion on gear ratios where i eas thinking og swapping to a 2.56 final drive from a 3.08 (on the other forum) you'll see that tire diameter will indeed affect it ... hcant put a number on it right now as i'm typing this sitting in my car in rush hour but it can be calculated easily and you can also get the excel spreadsheet i posted on there and see for yourself
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      02-16-2012, 05:17 PM   #5
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Those above are also very good points..
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      02-16-2012, 05:51 PM   #6
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you're basically spreading out the gearing (increasing rpm window) a little with taller tires, which will reduce average hp/acceleration. But i would rather have taller gearing for the n54.
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      02-16-2012, 05:57 PM   #7
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Lol going with a taller wheel diameter would decrease my 60-130 times by a half second!
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