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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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11-25-2019, 07:06 PM | #1 |
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Replacing/Upgrading Transmission
Hey guys, I'm new here and I got this car back in March (2015 FR-S). This is the first car that I've owned where I want to do modifications. I've owned bikes and done quite a bit of mechanical work on those, but this is another monster entirely.
I'm looking to install a supercharger in the near future (year or so), but I want to make sure my transmission is where it needs to be before I do that. I've heard a lot of good things about Jack's Transmission. I was told that if I'm going to be doing any kind of boost, that I may want to look into a performance rebuild as well as WPC treatment and CF synchros. I plan on buying a used transmission from eBay and shipping it to Jack's so I'm not without my car while I wait on the transmission to be rebuild. Is there a specific year that I should be looking for? And obviously I should try and find low mileage/undamaged. I'll be pulling the transmission myself with the oversight of an experienced mechanic. I want to make sure I don't miss anything. Can you guys give me suggestions on what other parts I may want to replace/look into while I have the transmission pulled? |
11-25-2019, 08:35 PM | #2 |
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You definitely don't need to do anything to your transmission for a supercharger
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11-26-2019, 11:10 AM | #3 | |
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Quote:
I think the previous owner either didn't know how to shift or was terribly rough because I am starting to have issues with 4th and 5th gear. I was told that it's a synchro issue and would require a rebuild. I figure if I'm going to rebuild it, I might as well make it bulletproof while I'm at it. Especially since I plan on adding more power. |
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11-26-2019, 11:47 AM | #4 |
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Understandable if you need a rebuild, but you're not going to improve the torque capacity or make the trans bulletproof with your current plans. Excessive power tends to destroy the actual gears, which is expensive to remedy and most end up converting to a different trans. As noted, you "should" be fine with a typical supercharger build though.
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11-26-2019, 11:57 AM | #5 | |
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I would try changing the transmission fluid a few times with something like the Motul fluid. I used to have a persistent 4th gear grind if I shifted into it at high RPM. Changing the fluid every 500 miles 3-4 times ( expensive, I know) fixed this completely. $170 in fluid is cheaper than a trans rebuilt though! If it makes you feel better, my car is turbo and my transmission has been perfect. |
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The Following User Says Thank You to DarkPira7e For This Useful Post: | jeepmor (09-13-2021) |
11-26-2019, 01:52 PM | #6 | ||
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Also, if I'm fine with a typical SC build, and I just need the trans rebuilt, what will the performance rebuild with the options listed above (WPC treatement, CF synchros) do for me? Quote:
I seriously appreciate you guys' help and guidance and look forward to any further suggestions/input. |
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11-26-2019, 06:20 PM | #7 | |
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11-26-2019, 07:10 PM | #8 | |
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Also it looks like the 4th gear thrust issue is resolved per this rebuild breakdown from Jack's: https://www.jackstransmissions.com/i...product_id=483 1st - 6th Gear Synchros Reverse Gear Synchro 3-4 Shift Fork 1-2 Gear Slider 3-4 Gear Slider 3-4 Gear Slider (Includes Over-Extension Modifications) 4th Gear Thrust Fix (Includes Custom Clips and Shaft Modifications) 5-Reverse Gear Slider Input / Output Oil Seals |
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11-26-2019, 07:51 PM | #9 |
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Dont worry. I bought a used 2013 with 58K miles and I am super charged with Flex Fuel. Really the main thing you need to worry about is the TOB if its original and slip on OEM clutch . Trans is good for much more power. not till you approach 325-350WTQ will you need to worry about certain gears in the trans
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11-26-2019, 09:34 PM | #10 | |
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11-26-2019, 10:02 PM | #11 |
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https://www.mazworx.com/mazworx-favq...t-frs/brz.aspx
I like this, if its a bolt in option, and not just parts I need to weld and bolt on to an existing gearbox.
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11-27-2019, 01:41 PM | #12 | ||
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11-27-2019, 03:53 PM | #13 |
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11-29-2019, 12:21 AM | #14 |
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