Quite rare I believe.... reverse gear is helicoidal - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Harvey · 05-29-2014, 05:17 PM

I believe most MT have a straight toothed reverse gear. The GT86 has helical gears. That's why our cars reverse relatively quietly....

PS: no question here... just noticed this while browsing the repair manual....

CarzCarzCarz · 05-29-2014, 05:46 PM

Interesting, I never thought about it, but is quite while reversing. Where did you find that in the manual?

86-tundra · 05-29-2014, 05:55 PM

It all makes sense now!! Never thought about the fact that we get no reverse whine..

Lawn_Mower · 05-29-2014, 06:05 PM

My GTI is like that, I think it's a lot less common in Japanese cars.

Jyn · 05-29-2014, 06:19 PM

lol I actually was kinda sad when I first put the car in reverse and didn't hear (what I call) the Honda whine...

dem00n · 05-29-2014, 10:57 PM

Why?

gtfapollo · 05-29-2014, 11:53 PM

Pretty interesting stuff. Generally straight cut gears are tougher than helical or spiral toothed gears but are noisier and less costly to manufacture (on average). Reversed hardly gets used and is geared the lowest so in most cases it makes sense. Race cars have straight cut gears for the heavy demands or track and what not and noise really is not an issue ;-)

Harvey · 05-30-2014, 05:03 AM

Quote:

Originally Posted by CarzCarzCarz

Interesting, I never thought about it, but is quite while reversing. Where did you find that in the manual?

Can see it here (in the manual transaxle components section of the repair manual) :

paulca · 05-30-2014, 09:33 AM

Am I missing something or does that diagram omit the actual reverser gear?

Harvey · 05-30-2014, 05:49 PM

no, the Arrow points to it, unless I'm wrong!,

Jaxx · 05-31-2014, 05:39 PM

.. straight cut gears because they are stronger and thus can be skinnier in size which was a huge deal in the subaru 5 speed. not so much with the 6

n0thing · 05-31-2014, 05:54 PM

humfrz · 06-01-2014, 03:50 AM

Quote:

Originally Posted by Harvey

I believe most MT have a straight toothed reverse gear. The GT86 has helical gears. That's why our cars reverse relatively quietly....

PS: no question here... just noticed this while browsing the repair manual....

Thanks for the information.

I've often wondered why my neighbor's honda sounds like an old model model A when it is backing up ....

humfrz

paulca · 06-01-2014, 04:32 AM

Quote:

Originally Posted by Harvey

no, the Arrow points to it, unless I'm wrong!,

You need a third gear to reverse the direction. Usually goes in between the input shaft reverse gear and an output shaft gear.

05-29-2014, 05:17 PM	#1
Harvey Senior Member Join Date: May 2014 Drives: Celica 5th Gen, Tiburon 04, GT86 Location: France Posts: 135 Thanks: 2 Thanked 58 Times in 16 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Quite rare I believe.... reverse gear is helicoidal I believe most MT have a straight toothed reverse gear. The GT86 has helical gears. That's why our cars reverse relatively quietly.... PS: no question here... just noticed this while browsing the repair manual....

05-29-2014, 05:55 PM	#3
86-tundra Troll Hunter Join Date: Aug 2013 Drives: fr-s, tundra Location: Somewhere Posts: 1,424 Thanks: 1,695 Thanked 922 Times in 470 Posts Mentioned: 39 Post(s) Tagged: 0 Thread(s)	It all makes sense now!! Never thought about the fact that we get no reverse whine.. __________________ DIY Winjet Retrofit

05-29-2014, 06:19 PM	#5
Jyn Noob Join Date: Jan 2014 Drives: FR-S Mammogram Location: Austin Posts: 1,594 Thanks: 577 Thanked 888 Times in 485 Posts Mentioned: 24 Post(s) Tagged: 2 Thread(s)	lol I actually was kinda sad when I first put the car in reverse and didn't hear (what I call) the Honda whine... __________________ :@ChaoyD

05-29-2014, 10:57 PM	#6
dem00n Member of the year - 2016 Join Date: Jul 2012 Drives: Scion FRS Location: New York Posts: 3,575 Thanks: 788 Thanked 2,427 Times in 1,111 Posts Mentioned: 23 Post(s) Tagged: 0 Thread(s)	Why? __________________ Friends don't let friends Plastidip

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05-29-2014, 05:46 PM	#2
CarzCarzCarz Senior Member Join Date: Mar 2014 Drives: 2014 WRB BRZ Location: Texas Posts: 294 Thanks: 240 Thanked 76 Times in 63 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Interesting, I never thought about it, but is quite while reversing. Where did you find that in the manual?

05-29-2014, 06:05 PM	#4
Lawn_Mower Senior Member Join Date: May 2014 Drives: GTI, BRZ Location: Mooresville, NC Posts: 120 Thanks: 13 Thanked 49 Times in 26 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My GTI is like that, I think it's a lot less common in Japanese cars.

05-29-2014, 11:53 PM	#7
gtfapollo Member Join Date: May 2014 Drives: Velocity Orange Location: Melbourne Posts: 59 Thanks: 30 Thanked 26 Times in 15 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Pretty interesting stuff. Generally straight cut gears are tougher than helical or spiral toothed gears but are noisier and less costly to manufacture (on average). Reversed hardly gets used and is geared the lowest so in most cases it makes sense. Race cars have straight cut gears for the heavy demands or track and what not and noise really is not an issue ;-)

05-30-2014, 09:33 AM	#9
paulca Senior Member Join Date: May 2014 Drives: Toyota GT86 Coupe Red (UK) Location: United Kingdom Posts: 554 Thanks: 20 Thanked 291 Times in 171 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Am I missing something or does that diagram omit the actual reverser gear?

05-30-2014, 05:49 PM	#10
Harvey Senior Member Join Date: May 2014 Drives: Celica 5th Gen, Tiburon 04, GT86 Location: France Posts: 135 Thanks: 2 Thanked 58 Times in 16 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	no, the Arrow points to it, unless I'm wrong!,

05-31-2014, 05:39 PM	#11
Jaxx Junior Member Join Date: Apr 2014 Drives: 93 wrx Location: United States Posts: 3 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	.. straight cut gears because they are stronger and thus can be skinnier in size which was a huge deal in the subaru 5 speed. not so much with the 6

05-31-2014, 05:54 PM	#12
n0thing Senior Member Join Date: Jan 2014 Drives: Subaru BRZ Location: Markham Posts: 394 Thanks: 48 Thanked 90 Times in 53 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)

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