Who wants a TALLER MFactory 6th gear - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

toast · 10-17-2017, 09:39 AM

I contacted MFactory about producing a taller (.687) 6th gear. For those with the OEM rear end this will put you at 78 mph in 6th gear at 3000 rpm. For those with shorter rear ends, do the math

They responded that due to their forging process it is only economical if they do a batch of 30 units. Same price as their shorter 6th, $360, and they will make it so it slides right on to the shaft without any case modifications.

I would like to get a head count of those interested. Replies of 'I might be' are not helpful...

JazzleSAURUS · 10-17-2017, 09:44 AM

Sounds awesome for guys with a lot of highways and long straights in their area, or big power folks trying to keep the RPM's down.

nav · 10-18-2017, 09:14 PM

Hey Toast, that is an awesome idea - especially for those who decide to run a shorter final drive. I'll use my car with some back of the napkin numbers:

Original: 4.1 Final Drive
Gearing Torque Increase: 0%
Highway Crusing @ 70mph: 3000rpm

Current: 4.8 Final Drive
Gearing Torque Increase: 17% (all gears)
Highway Crusing @ 70mph: 3500rpm

Proposed: 4.8 Final Drive (with 0.687 / 6th Gear)
Gearing Torque Increase: 17% (gear 1-5)
Highway Crusing @ 70mph: 3150rpm

Given the usage of my car, I do like the idea of sacrificing the final gear of the vehicle as an 'overdrive' gear. Great initiative Toast!

Spawn_Of_Creation · 10-18-2017, 11:12 PM

I posted my few cents and interest in another thread (http://www.ft86club.com/forums/showt...php?p=2984138#) about a month ago. I'll commit to this.

some numbers for those who are curious ~

Final Drive 3.73:1 @ 3000 rpm:
Custom 0.687 ratio 6th gear = 86mph
Stock 6th gear = 77mph
MFactory short 6th gear = 68mph

(Stock) Final Drive 4.1:1 @ 3000 rpm:
Custom 0.687 ratio 6th gear = 78mph
Stock 6th gear = 70mph
MFactory short 6th gear = 62mph

Final Drive 4.44:1 @ 3000 rpm:
Custom 0.687 ratio 6th gear = 72mph
Stock 6th gear= 65mph
MFactory short 6th gear= 58mph

Final Drive 4.55:1 @ 3000 rpm:
Custom 0.687 ratio 6th gear = 70mph
Stock 6th gear = 63mph
MFactory short 6th gear = 56mph

Final Drive 4.67:1 @ 3000 rpm:
Custom 0.687 ratio 6th gear = 68mph
Stock 6th gear = 61mph
MFactory short 6th gear = 55mph

Final Drive 4.8:1 @ 3000 rpm:
Custom 0.687 ratio 6th gear = 67mph
Stock 6th gear = 60mph
MFactory short 6th gear = 53mph

why? · 10-24-2017, 06:39 AM

what would be the speed at 2500 rpm or 2000 rpm with the stock final drive? I've been thinking about this, 6th gear seems all wrong for US speeds. And with the final drive mods it makes it even worse.

Spuds · 10-24-2017, 07:05 AM

I wished 6th, and maybe even 5th, was a bit taller for a while as my commute is mostly highway. Though I'm not sure the install time/cost is worth it to me.

tshrey · 10-24-2017, 11:12 AM

Quote:

Originally Posted by why?

what would be the speed at 2500 rpm or 2000 rpm with the stock final drive? I've been thinking about this, 6th gear seems all wrong for US speeds. And with the final drive mods it makes it even worse.

78/3000=x/your target rpm. solve for x.

At 2000 rpm you would be going 52, etc

BRX · 10-24-2017, 02:19 PM

I posted on the other thread somehow but anyway, I'm interested in a taller 6th gear or even a whole gear set. But I doubt we'll get 28 other people committed.

Sent from my Pixel XL using Tapatalk

why? · 10-24-2017, 03:43 PM

Quote:

Originally Posted by tshrey

78/3000=x/your target rpm. solve for x.

At 2000 rpm you would be going 52, etc

oh ouch, I remember those. I guess there is a reason I have a worthless non-math degree and not something actually useful.

racer1600 · 11-09-2018, 05:41 PM

Was there any other movement on this product? It would be awesome to get a taller 6th gear.

Sent from my Moto Z (2) using Tapatalk

MrDinkleman · 11-09-2018, 06:30 PM

Hmmm... first time I've seen this thread.

How is the quality/durability (based on experiences with shorter gears)?

I've been casually looking for an M85, IS300 LSD rear end to lower my highway RPMs. But this would affect all gears and the speedo.

A taller 6th gear is better approach. For $360, I'm in.

x808drifter · 11-09-2018, 06:51 PM

Quote:

Originally Posted by MrDinkleman

Hmmm... first time I've seen this thread.

How is the quality/durability (based on experiences with shorter gears)?

I've been casually looking for an M85, IS300 LSD rear end to lower my highway RPMs. But this would affect all gears and the speedo.

A taller 6th gear is better approach. For $360, I'm in.

The speedo is off the wheel sensor. The only thing that affects it is tire size.

MrDinkleman · 11-09-2018, 08:13 PM

Quote:

Originally Posted by x808drifter

The speedo is off the wheel sensor. The only thing that affects it is tire size.

Oh, okay. So if this final gear thing dies, I can still go the M85 route although I would still prefer just a taller OD...

Thanks

x808drifter · 11-09-2018, 08:26 PM

Yep.
Change all the gears you want.
The speedo should read correct if the tire size is the same.

10-17-2017, 09:39 AM	#1
toast Senior Member Join Date: Jul 2014 Drives: 14 BSP Edelbrock BRZ Location: Lon Gisland Posts: 806 Thanks: 113 Thanked 450 Times in 256 Posts Mentioned: 12 Post(s) Tagged: 0 Thread(s)	Who wants a TALLER MFactory 6th gear I contacted MFactory about producing a taller (.687) 6th gear. For those with the OEM rear end this will put you at 78 mph in 6th gear at 3000 rpm. For those with shorter rear ends, do the math They responded that due to their forging process it is only economical if they do a batch of 30 units. Same price as their shorter 6th, $360, and they will make it so it slides right on to the shaft without any case modifications. I would like to get a head count of those interested. Replies of 'I might be' are not helpful...

10-17-2017, 09:44 AM	#2
JazzleSAURUS Senior Member Join Date: May 2015 Drives: 15 BRZ LTD, 05 FXT Location: Western MA Posts: 1,032 Thanks: 561 Thanked 558 Times in 351 Posts Mentioned: 9 Post(s) Tagged: 0 Thread(s)	Sounds awesome for guys with a lot of highways and long straights in their area, or big power folks trying to keep the RPM's down. __________________ SOLD: 2015 WRB BRZ Limited ('02 WRX BBS, S-04's, Stoptech Sport pads, MXP SP, AVO drop in filter, Mishimoto Intake tube, decatted header, OFT 93 Stage 2 EL Tune, Kartboy rear shifter bushing, Whiteline transmission and subframe lockout bushings, ST Coilovers, SPC Camber bolts w/smaller crash bolt, SPC LCA's & SPC Toe Arm bushings, Red TOMs, TRD Wing.)

10-18-2017, 11:12 PM	#4
Spawn_Of_Creation Human Join Date: Jan 2016 Drives: 2015 BRZ Black Location: Dallas, TX Posts: 207 Thanks: 105 Thanked 102 Times in 67 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I posted my few cents and interest in another thread (http://www.ft86club.com/forums/showt...php?p=2984138#) about a month ago. I'll commit to this. some numbers for those who are curious ~ Final Drive 3.73:1 @ 3000 rpm: Custom 0.687 ratio 6th gear = 86mph Stock 6th gear = 77mph MFactory short 6th gear = 68mph (Stock) Final Drive 4.1:1 @ 3000 rpm: Custom 0.687 ratio 6th gear = 78mph Stock 6th gear = 70mph MFactory short 6th gear = 62mph Final Drive 4.44:1 @ 3000 rpm: Custom 0.687 ratio 6th gear = 72mph Stock 6th gear= 65mph MFactory short 6th gear= 58mph Final Drive 4.55:1 @ 3000 rpm: Custom 0.687 ratio 6th gear = 70mph Stock 6th gear = 63mph MFactory short 6th gear = 56mph Final Drive 4.67:1 @ 3000 rpm: Custom 0.687 ratio 6th gear = 68mph Stock 6th gear = 61mph MFactory short 6th gear = 55mph Final Drive 4.8:1 @ 3000 rpm: Custom 0.687 ratio 6th gear = 67mph Stock 6th gear = 60mph MFactory short 6th gear = 53mph __________________ "Always listen to experts. They'll tell you what can't be done, and why. Then do it." - The Notebooks of Lazarus Long Last edited by Spawn_Of_Creation; 10-24-2017 at 05:10 AM.

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10-18-2017, 09:14 PM	#3
nav Member Join Date: Aug 2017 Drives: Toyota 86 Location: Singapore Posts: 20 Thanks: 14 Thanked 18 Times in 5 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hey Toast, that is an awesome idea - especially for those who decide to run a shorter final drive. I'll use my car with some back of the napkin numbers: Original: 4.1 Final Drive Gearing Torque Increase: 0% Highway Crusing @ 70mph: 3000rpm Current: 4.8 Final Drive Gearing Torque Increase: 17% (all gears) Highway Crusing @ 70mph: 3500rpm Proposed: 4.8 Final Drive (with 0.687 / 6th Gear) Gearing Torque Increase: 17% (gear 1-5) Highway Crusing @ 70mph: 3150rpm Given the usage of my car, I do like the idea of sacrificing the final gear of the vehicle as an 'overdrive' gear. Great initiative Toast!

10-24-2017, 06:39 AM	#5
why? Only happy when it rains. Join Date: Feb 2013 Drives: series.blue Location: Harnett county NC Posts: 1,995 Thanks: 5,698 Thanked 1,263 Times in 749 Posts Mentioned: 25 Post(s) Tagged: 0 Thread(s)	what would be the speed at 2500 rpm or 2000 rpm with the stock final drive? I've been thinking about this, 6th gear seems all wrong for US speeds. And with the final drive mods it makes it even worse.

10-24-2017, 07:05 AM	#6
Spuds The Dictater Join Date: Apr 2017 Drives: '13 Red Scion FRS Location: MD, USA Posts: 9,428 Thanks: 26,110 Thanked 12,430 Times in 6,146 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	I wished 6th, and maybe even 5th, was a bit taller for a while as my commute is mostly highway. Though I'm not sure the install time/cost is worth it to me.

10-24-2017, 02:19 PM	#8
BRX Senior Member Join Date: Jul 2015 Drives: Toyota GT86 Location: Abu Dhabi, UAE Posts: 168 Thanks: 42 Thanked 111 Times in 64 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I posted on the other thread somehow but anyway, I'm interested in a taller 6th gear or even a whole gear set. But I doubt we'll get 28 other people committed. Sent from my Pixel XL using Tapatalk

11-09-2018, 05:41 PM	#10
racer1600 Member Join Date: Jul 2018 Drives: 2013 FRS Location: Lancaster Califronia Posts: 27 Thanks: 0 Thanked 0 Times in 0 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Was there any other movement on this product? It would be awesome to get a taller 6th gear. Sent from my Moto Z (2) using Tapatalk

11-09-2018, 06:30 PM	#11
MrDinkleman Senior Member Join Date: Oct 2015 Drives: 2016 Oceanic, "base" model Location: Gardena, CA Posts: 398 Thanks: 129 Thanked 179 Times in 128 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Hmmm... first time I've seen this thread. How is the quality/durability (based on experiences with shorter gears)? I've been casually looking for an M85, IS300 LSD rear end to lower my highway RPMs. But this would affect all gears and the speedo. A taller 6th gear is better approach. For $360, I'm in.

11-09-2018, 08:26 PM	#14
x808drifter LMGTFY Join Date: Mar 2016 Drives: 13 FRS, 91 Miata Location: Lava Town, HI Posts: 2,776 Thanks: 5,561 Thanked 3,646 Times in 1,625 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	Yep. Change all the gears you want. The speedo should read correct if the tire size is the same.

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