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Old 05-11-2015, 04:52 AM   #1
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New gears or new taller tires?

Right now I have 285/40 nitto nt555 with a diameter of 26.97 inches. On my OEM 3:31 gears, I'm essentially at a 3:28gear ratio. I noticed I had a decent amount of RPM left when crossing the quarter mile so what should I do to maximize the power I have. I could go with 3:55 or 3:73 gears with my tires and get a ration of 3:51/3:69 depending on which I go with or I could get a taller tire.

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Old 05-11-2015, 05:11 AM   #2
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Id say 3.73 and call it good


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Old 05-11-2015, 05:17 AM   #3
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Old 05-11-2015, 07:28 AM   #4
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There are plenty of sites that will calculate your RPM and speed based on trans gearing, tire size, and rear end gearing. I played around with the gearing numbers and tire sizes until I found my desired goal (135 @ about 7400rpm, 4th gear). Just do a quick google search of gear ratio speed calculator or something along those lines.
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Old 05-11-2015, 09:31 AM   #5
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I dont think your math is right. A stock tire is around 27.25" tall, so yours is slightly shorter. In my mind, a shorter tire is the equivalent of going to a higher number gear (>3.31), whereas a taller tire would be the same as a lower number gear (<3.31).

If you think about it, a smaller tire would need to turn more rpm to maintain the same speed, similar to a 3.73 vs a lower reving 3.31.



However, assuming i am completely off in my assumptions, tires are both cheaper and less permanent that gears so ... makes sense to start there.
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Old 05-11-2015, 09:44 AM   #6
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Quote:
Originally Posted by Voltwings View Post
I dont think your math is right. A stock tire is around 27.25" tall, so yours is slightly shorter. In my mind, a shorter tire is the equivalent of going to a higher number gear (>3.31), whereas a taller tire would be the same as a lower number gear (<3.31).

If you think about it, a smaller tire would need to turn more rpm to maintain the same speed, similar to a 3.73 vs a lower reving 3.31.
This is correct.
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Old 05-11-2015, 10:54 AM   #7
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New gears or new taller tires?

Quote:
Originally Posted by Jvibe92 View Post
Right now I have 285/40 nitto nt555 with a diameter of 26.97 inches. On my OEM 3:31 gears, I'm essentially at a 3:28gear ratio. I noticed I had a decent amount of RPM left when crossing the quarter mile so what should I do to maximize the power I have. I could go with 3:55 or 3:73 gears with my tires and get a ration of 3:51/3:69 depending on which I go with or I could get a taller tire.

Opinions?


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If you get taller tires than 26.97" then you'll have enough rpm in 4th to cross at 145-150 lol

Way too tall for 3.31 gears. Go with a shorter tire to effectively make your 3.31 into like a 3.55

I would change out the tire width and call it a day unless you absolutely need big fat meaty tires then you're forced to swap out 3.73.

I have essentially 28.43" tires on mine and with the stock 3.31 gears I could pull 115mph in third (too slow to cross the line else I'll bang on the limiter crossing the line) and 147mph in fourth (way too tall to optimize powerband).

Goal is to cross the line at the top of the gear you're currently in with maybe just a bit left for an extra 5-10mph for future mods.

I think you're 26.97" and 3.31 combo isn't a bad combo at all. You'll cross the line at a max 138mph in fourth gear. Plenty of potential for anything including spraying and forced induction.


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Old 05-11-2015, 11:01 AM   #8
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New gears or new taller tires?

Here's some calculations that I did when I considered tire and axle ratio options:

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My fastest 0-60 time was still on my stock tires 255/40/19 (4.2s)

Going with the 285/30/20 Nitto 555 I ran 0-60 (4.3-4.4s)

Going up to 305/35/20 I was barely cracking 4 seconds and consistently ran (4.9-5.1s)

Currently 305/35/20 MT Street Comp and swapped out with 3.73 gears I'm barely back to 4.4-4.5s range. Technically I'm shorter than the 285/30/20 and 3.31 gears combo but the added weight of the tires makes it less willing to get to speed.

Now I just need an extra 30whp that's all. Time for some cams lol

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Old 05-11-2015, 11:38 PM   #9
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I thought a shorter tire meant a higher ratio but on all the sites it says my gear ratio gets taller? That's why I wrote it like that.


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Old 05-12-2015, 08:31 AM   #10
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Always go with less rotational mass <------- ******

Quote:
Originally Posted by DallasStang77 View Post
Here's some calculations that I did when I considered tire and axle ratio options:

My fastest 0-60 time was still on my stock tires 255/40/19 (4.2s)

Going with the 285/30/20 Nitto 555 I ran 0-60 (4.3-4.4s)

Going up to 305/35/20 I was barely cracking 4 seconds and consistently ran (4.9-5.1s)

Currently 305/35/20 MT Street Comp and swapped out with 3.73 gears I'm barely back to 4.4-4.5s range. Technically I'm shorter than the 285/30/20 and 3.31 gears combo but the added weight of the tires makes it less willing to get to speed.

Now I just need an extra 30whp that's all. Time for some cams lol
I keep telling people to look at wheel & tire weights when shopping for new wheels, not just what looks good. People often "upgrade" to some 20's but don't realize they added 5-10 lbs per tire by going with cheap wheels and effectively made their car noticeably slower. It makes such a big difference...

I upgraded to some lightweight 19's and the acceleration difference from stock was huge.
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