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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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03-03-2017, 12:15 PM | #29 |
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thanks I was rather clueless to how the ratio changes in either direction. your explanation makes sense. ive seen it as an dealer option sometimes when building new makes over the web.
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03-03-2017, 12:23 PM | #30 | |
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Quote:
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02-11-2018, 07:47 AM | #31 | |
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02-11-2018, 11:21 AM | #32 |
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If I was pushing that much power I would probably want longer gears too.
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02-11-2018, 12:21 PM | #33 |
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Installed 3.91 rear diff from Lexus is300- amazing
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02-12-2018, 03:40 AM | #34 |
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So if I get it right, IF you have power levels that overwhelm your tires and thus traction, you can swap to a lower FD like this one. Meaning you'll have better traction, and possibly have better acceleration.
@OP : did you end up timing the difference between stock and this FD with your setup for something like 0-60 or 0-100? |
02-13-2018, 04:51 PM | #35 |
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Is this a pretty straight forward bolt on process? I'm actually thinking of doing this now my rear end loves to break loose.....I also miss flooring it on 1st-2nd gear
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02-13-2018, 10:58 PM | #36 | |
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Quote:
It's one of the reasons why a turbo manual transmission twin that makes the same amount of power as a turbo automatic transmission twin will lose in a roll race. While NA, the manual would destroy the automatic.
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02-14-2018, 10:19 AM | #37 |
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Yes, the IS300 rear diff is a direct swap. The OP has since swapped back to the stock diff.
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02-14-2018, 10:37 AM | #38 |
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why'd he swap back?
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02-14-2018, 07:04 PM | #39 |
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Curious to know this as well, I've been hunting for IS300 diffs now.
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02-15-2018, 02:26 PM | #40 |
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I would be curious also why he swapped 🧐
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02-16-2018, 09:46 AM | #41 |
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I can't remember exactly but IIRC he preferred the shorter gearing in the higher gears.
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08-30-2019, 10:13 AM | #42 |
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For those of you guys who drives a lot of freeways on their manual cars :-)
I daily drive my 86 (100-160 miles every day) and it's turbocharged. Since my 2017 86 MT comes with 4.3 FD from the factory long distance rides were pretty annoying. So I was looking for the way how to lower final drive in order to lower RPMs and increase freeway speeds and fuel economy. Did some research and figured out that 3.58 is the lowest possible gear ratio for our differential. So I bought ring and pinion gears and installation hardware from Nitro Gears. Done everything by myself in my own garage. It wasn't easy but youtube helped a lot. I also got a bit more comfortable tires - 225/45R17. As a result - freeway long distance rides are very comfortable, just like on automatic transmission cars. 70mph on 6th gear engine revs are 2700 rpm. Before it's been doing like 3000 rpm at 65mph. Here is the speed comparison chart for 4.3 and 3.58 final drive ratios: PS: 0-60 time is still decent :-) Last edited by Sonic86; 08-30-2019 at 10:38 AM. Reason: corrections |
The Following User Says Thank You to Sonic86 For This Useful Post: | StraightOuttaCanadaEh (08-30-2019) |
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