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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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02-16-2021, 03:53 PM | #15 | |
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The Following User Says Thank You to norcalpb For This Useful Post: | why? (02-25-2021) |
02-25-2021, 01:12 AM | #16 | |
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02-25-2021, 01:14 AM | #17 | |
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02-25-2021, 06:28 AM | #18 | |
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When asked about faulty gear set they all said it was highly unlikely. |
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02-25-2021, 01:03 PM | #19 | |
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02-25-2021, 06:31 PM | #20 | |
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02-25-2021, 08:06 PM | #21 |
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I got the AF 4.5 3years ago from rhd was $650 shipped, arrived surprisingly quick too. Easy install, zero noise. No different than OEM besides ratio change obviously.
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02-25-2021, 08:55 PM | #22 |
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Do you know if the 4.8 on AF is 4.80 or the 4.875? I was thinking I might try the 5.1. The 20 miles I drove the 4.875 was really good, I dont think itll be a dramatic change going to 5.1
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02-25-2021, 09:03 PM | #23 | |
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There is no free lunch with a FD swap. The difference in acceleration from a roll is not what a lot of people think. Do you have a specific use for the car or reason for the swap, specifically 4.88 or now 5.1? With the 4.88 did you go WOT 1-5th? really a specific break in protocol that doesn’t involve any WOT for 200miles so i hope not. |
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02-25-2021, 10:13 PM | #24 | |
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02-25-2021, 10:32 PM | #25 | |
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It’s highly dependent on what you want, how you drive, what you’re doing it for etc... from a dig a numerically higher FD ratio is faster, from a roll it can be slower in just as many situations as it will be faster depending on the ratio and what speed you are starting at. This also is a big factor on the track as corner exit speed and/or top straight speed may be lined up exactly to what FD you chose or exactly opposite to your FD and you end up being slower as you choose the FD to match the track / situation. For a general DD / fun hwy puller I liked being able to hit 120, and be at optimal rpm / gear for starting a pull from 20 40 and 60 as those are typical roll speeds or daily situation speeds, or corner exit speeds to start from and the 4.56 is the most optimal/fastest for that with the 24.9” tire and 100rpm higher redline. With stock size tire and stock redline a 4.44 would be better In that situation. |
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02-25-2021, 11:12 PM | #26 | |
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02-25-2021, 11:34 PM | #27 | |
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Speed limit here is 60mph on freeway. 45-55 on hwy usually. My NA setup on 92 octane ran a verified dragy 0-60 in 6.6 or 6.4 1ft roll out. fastest I’ve seen an NA auto run especially not on E85. 4.8 / 4.6(1ft) on FI setup, swapped to a 4.3 FD with 25” tire once FI. |
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02-25-2021, 11:42 PM | #28 | |
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