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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 03-10-2024, 11:41 AM   #15
Grady
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Originally Posted by blsfrs View Post
Several months ago (in a galaxy far, far away) Didn't someone post about a CF driveshaft failure on their rally car.
Yep, probably took a rock hit. CF is strong, until it get damaged then it is shit. I have the center tunnel covered to protect it from getting hit.
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Old 03-10-2024, 04:07 PM   #16
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Just ask Stockton Rush.


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Old 03-11-2024, 01:17 PM   #17
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I would say get the gr86 driveshaft but I’m not 100% sure they fit the first gen.
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Old 03-11-2024, 06:52 PM   #18
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It fits and it's 1,5 kgs lighter. I would like to know is the diameter is the same, and how they achieved more lightness.
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Old 03-12-2024, 12:55 PM   #19
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It fits and it's 1,5 kgs lighter. I would like to know is the diameter is the same, and how they achieved more lightness.
I’m down to order one and measure it for you, but do you remember if the automatic and manual driveshafts are the same?
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Old 03-12-2024, 01:01 PM   #20
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I’m down to order one and measure it for you, but do you remember if the automatic and manual driveshafts are the same?
Or you could check some documents that somebody has.
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Old 03-12-2024, 01:03 PM   #21
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Or you could check some documents that somebody has.
I know I was going to do my usual parts.subaru.com research but wanted to see if someone knew top of mind first lol.

Edit: it appears auto and 6mt have different part numbers, makes my eBay shopping slightly more complicated
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Old 03-12-2024, 02:42 PM   #22
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I know I was going to do my usual parts.subaru.com research but wanted to see if someone knew top of mind first lol.

Edit: it appears auto and 6mt have different part numbers, makes my eBay shopping slightly more complicated
I meant the stuff in my signature. Specificlly for the shaft diameters.
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Old 03-12-2024, 05:38 PM   #23
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Thank you for your help. I confirm that both the propeller shafts have the same diameter, 70 in the first part and 57 in the second part.
Now we'd need to understand why the second gen is lighter, less material (so more flexible) or just different material?

Last edited by gpvecchi; 03-12-2024 at 05:59 PM.
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Old 03-12-2024, 06:43 PM   #24
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I’ll take some comparison photos later this month when my GR86 driveshaft arrives!

Last edited by norcalpb; 04-07-2024 at 11:44 PM.
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Old 04-07-2024, 11:48 PM   #25
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Thank you for your help. I confirm that both the propeller shafts have the same diameter, 70 in the first part and 57 in the second part.
Now we'd need to understand why the second gen is lighter, less material (so more flexible) or just different material?


They are pretty identical but this section was different. Looks like they replaced the main U joint with a CV joint?
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Old 04-08-2024, 01:59 AM   #26
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Thank you very much. Are you able to weight them?
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Old 04-08-2024, 05:07 PM   #27
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Thank you very much. Are you able to weight them?
Didn’t have anything to weight them with by unfortunately the gr86 is already on the car.
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Old 04-09-2024, 01:53 AM   #28
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Any difference in driving?
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