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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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02-09-2016, 07:56 PM | #1 |
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Final Drive + 18" Wheels?
Tax refund coming in, plan on getting FD and some new wheels/tires. Not sure if this question has been asked before SO here goes nothing.
Ideally 4.67 seems to be the FD most suited for my needs. Weir only sells 4.56 & 4.88, and I refuse to pay 2.5-3x the price for MFactory gears. If I were to get 18" wheels and the 4.88 FD, would that put me around 4.67 because of the wheels making the gear ratio longer? Or would the difference in diameter drop me below the 4.56?
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02-09-2016, 09:32 PM | #2 | |
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02-09-2016, 09:35 PM | #3 |
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4.88 with 235/40/18 or 225/40/18
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02-09-2016, 09:39 PM | #4 |
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Look on tire rack they give you the diameter. I have 245/35r18's all around and they are the same diameter as stock. Which is the primary reason I went with that size.
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02-09-2016, 09:44 PM | #5 |
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So what outer diameter should I be aiming for to drop the overall gearing of the car to a 4.67 range?
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02-09-2016, 09:56 PM | #6 |
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Something narrow and like 16" wheels. Not really feasible or cosmetic. Most tires decrease the final drive.
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02-10-2016, 12:28 AM | #7 | |
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The Following User Says Thank You to Hyper4mance2k For This Useful Post: | swarb (02-10-2016) |
02-10-2016, 01:22 AM | #8 |
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Why not 16s or 17s?
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02-10-2016, 02:22 AM | #9 | |
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Warning! MATHS inside
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02-10-2016, 08:00 AM | #10 | |
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Haha, ironically I am an engineer and graduated 1-2 courses short of a mathematics degree as well. EE's don't know anything about gearing is all!
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02-10-2016, 08:26 AM | #11 | |
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What wheel size are you planning on running? widths/offsets? How low do you plan to go? And how much power/grip do you have and want? 245/40-18 is a pretty good size, but would be slightly shorter(bigger number) than 4.67 gears. Just beware if you go too low, since you are planning to get a bigger diameter tire, there will be less room in the wheel wells. And how did you come to the conclusion that 4.67(or 4.88 with taller tires) is the setup you are after? |
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The Following User Says Thank You to swarb For This Useful Post: | Hyper4mance2k (02-10-2016) |
02-10-2016, 10:20 AM | #12 | |
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1" drop (Eibach Pros) Stg 2 OFT beta tune (~200whp 93oct) I looked at the RPMs I would be hitting in 70 on the highway at 4.56 and 4.88, and somewhere in the middle is a happy medium.
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02-10-2016, 10:44 AM | #13 | |
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As mentioned above, 4.88 to 4.67 is about 4.3% 215/45-17 compared to 245/40-18 is about 4.3% also. (Reconfirm yourself) So that IS the tire size you need. 245/40-18. Good luck and thank me. |
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02-10-2016, 11:19 AM | #14 |
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Interesting thread. I'm about to do the same exact thing but never really thought about how much the wider wheel/tire diameter would effect the aftermarket final drive.
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