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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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04-29-2017, 09:49 AM | #1 |
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Whining noise at highway speed- Cause?
I am getting a high pitch whining noise that i notice around 60mph and it gets more noticeable at higher speeds. The pitch changes at speed, and when I lift the throttle, it disappears. I suspect it may be a rear end ring and pinion that has developed a wear pattern that makes noise with torque from throttle and disappears without the torque. Seems to make noise in 5th and 6th gears. Thoughts? Anyone else get this noise?
I had an 1st gen RX7 that made similar noise that was the ring and pinion wear, so that was where my speculation came from. Thanks |
04-29-2017, 10:08 AM | #2 |
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You can always start with a rear diff fluid flush and replacement. at 27k Miles when I did my AMSOIL everything, my rear diff fluid was black, black, black...
The Subaru transmission fluid looked healthly but I had 1st and 2nd gear notching issues that needed to be resolved with better fluid. That has since been resolved.
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2014 Subaru BRZ
FBM Turbokit: GTX3076R - ECUTEK HRI FlexFuel tune - FBM 3" Turboback Exhaust - 550cc Injectors - Walbro 485 Fuel Pump - 4bar Map Sensor - FBM Oil Pan - ACT SB7-XTSS - AMSOIL all fluids - Forester XT Oil Cooler - Cusco engine, trans mounts - Whiteline rear differential bushings - Perrin shifter bushing - Firehawk 235/45/17 - AEM Failsafe |
04-30-2017, 05:59 PM | #3 | |
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I've had that noise for the past 40K miles.
Here's the thread where other owners have experienced it: http://www.ft86club.com/forums/showt...h+pitch&page=3 For the duration that I've had it, it hasn't gotten louder. To me it doesn't seem mechanical but electrical in nature. Especially how sharp the border between the noise/ no-noise occurrence is. I mean you only barely touch the gas pedal to make it appear and then it doesn't chance the tone no matter how much load you put on the engine. Same with lifting the throttle - it's a sharp transition into no-noise when the foot is almost coming off the pedal. Quote:
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