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Looking for good gear choices

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Old Sep 17, 2017 | 10:25 AM
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02ws666's Avatar
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Default Looking for good gear choices

Trying to wrap up some final items for my build, hoping you guys can suggest a proper rear gear for my setup. I was originally thinking 323s but I honestly am not sure with boosted applications. The 410s were killer with a cam only but obviously would be **** with twins.

MLRE 5.3
Twin Turbo Stage I Cam 222/231 .602"/.598" 112+4
Twin Precision 5858s .58 a/r ball bearing
6 Speed.
100% street car.

Will be getting a 12 bolt from Jason at TDP.

Thanks again for all the help, Nick
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Old Sep 17, 2017 | 06:13 PM
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3.31 or 3.55 with 12 bolt. 28" tire.
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Old Sep 18, 2017 | 06:28 AM
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Gear it for whatever RPM you want to cross the trap at.
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Old Sep 18, 2017 | 07:23 AM
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Originally Posted by yenkomike
3.31 or 3.55 with 12 bolt. 28" tire.
Originally Posted by a05c
Gear it for whatever RPM you want to cross the trap at.
So this car will be a street car with no plans on bringing it to the strip other than a fun day at the 1/8 MAYBE. Is tire height as important to just roll around on the street?

Its a fun weekend project car.
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Old Sep 18, 2017 | 09:16 AM
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Tire size effects gear ratio by a lot. A car with 3.73 and 25 inch tall rears will feel like you lost major power off the line if you change to 28 inch tall tires. You need to know what tire size to make a decent guess what gear you will want.
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Old Sep 18, 2017 | 09:47 AM
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Use an online calculator to figure out what the RPM range is for the tire height and gear ratio that you want to have.
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Old Sep 18, 2017 | 09:56 AM
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OK, so to play the tire size game, I will likely just put an ET Street Rs on the stock rims for now. P275/40R17 26.1 Diameter tire.

I can always change the rear gear later when I put a new set of rims and tires on the car. But for now it will be on stock speedlines and 275 tires for at least the first set.
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