Final Drive: 4.56 vs. 4.88 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

mcbrawr · 12-09-2015, 01:07 PM

I've ordered all the extras needed to make the swap (seals, bearings) but have yet to order a ring and pinion due to not knowing which would fit my needs better.

I use the car as my DD, work commute is around 5 miles to/from. The closest freeway is the DC beltway an hour and a half north of me. My goals are to have a noticeable increase in acceleration without sacrificing the driving experience. We usually take my wifes car on longer trips during holidays but I do enjoy the 5+ hour drive to WV occasionally.

What are the top speed limitations to each?
Does 4.88 make it basically torture to drive 80mph for hours on end?
Which would be the better choice?

Freeman · 12-09-2015, 01:18 PM

What transmission do you have?

nikitopo · 12-09-2015, 01:33 PM

You can calculate top speeds per gear here: http://www.apexgarage.com/tech/gear_ratios.shtml

mcbrawr · 12-09-2015, 01:35 PM

manual transmission.

swarb · 12-09-2015, 02:57 PM

4.10 to 4.56 is pretty much 11%
So if you are at 3k rpm at a given speed, 4.56 would be about 3,300rpm. Maybe that will help you imagine what rpm you would be at with a higher final drive.
4.88 is is about 18% Let me know if you find out the rpms at 80mph for all the different final drives. I am too lazy to check right now.

Foulsmell · 12-09-2015, 03:27 PM

I went for 4.67 Mfactory on my DD M/T. It's perfect. Easier to drive than before due to the extra torque and comfortable cruising at higher speeds.

mcbrawr · 12-09-2015, 03:43 PM

Quote:

Originally Posted by Foulsmell

I went for 4.67 Mfactory on my DD M/T. It's perfect. Easier to drive than before due to the extra torque and comfortable cruising at higher speeds.

I don't think Weir sells a 4.67, or I would be very tempted to take that route myself!

Foulsmell · 12-09-2015, 03:44 PM

Quote:

Originally Posted by mcbrawr

I don't think Weir sells a 4.67, or I would be very tempted to take that route myself!

No it's an Mfactory one. I'm in the uk.

Foulsmell · 12-09-2015, 03:46 PM

It also depends on other mods. You won't need the 4.88 if you've got header exhaust etc for a DD I would say.

mrk1 · 12-09-2015, 03:52 PM

4.56 is very streetable and daily driveable, 4.88 is a bit more aggressive and maybe a little rough on a +5hr drive.

Sargy · 12-09-2015, 04:54 PM

Your at around 113 MPH when topping 5th gear.

crusing speeds in 6th gear at 70-75mph is around 4K rpm.

I drove to Toronto from Northern VA without any complaints. My Girlfriend was happily asleep. it all depends on the drivers needs and how loud the exhaust can be because the RPM will be higher most of the time.

stevesnj · 12-09-2015, 08:55 PM

Use this handy little calculator to get a more precise idea of the final ratio at the wheels with tire size.

https://tiresize.com/gear-ratio-calculator/

M1K3 · 12-10-2015, 08:00 AM

MFactory has a really good gear ratio calculator with a line graph for each gear:
http://calc.teammfactory.com/index.php

Here is a 4.56 vs 4.88 with 245/40/17 tires and stock 86 gears:
4.56vs4.88

mcbrawr · 12-10-2015, 09:11 AM

I guess my next question would be this:

Looking at the MFactory gearing calculator, I will have to be in 5th gear to hit 100mph. With 4.88 gears how will 5th feel? Like 4th currently?

12-09-2015, 01:07 PM	#1
mcbrawr Member Join Date: Jun 2015 Drives: 2014 BRZ Limited Location: Southern Maryland Posts: 64 Thanks: 3 Thanked 12 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 2 Thread(s)	Final Drive: 4.56 vs. 4.88 I've ordered all the extras needed to make the swap (seals, bearings) but have yet to order a ring and pinion due to not knowing which would fit my needs better. I use the car as my DD, work commute is around 5 miles to/from. The closest freeway is the DC beltway an hour and a half north of me. My goals are to have a noticeable increase in acceleration without sacrificing the driving experience. We usually take my wifes car on longer trips during holidays but I do enjoy the 5+ hour drive to WV occasionally. What are the top speed limitations to each? Does 4.88 make it basically torture to drive 80mph for hours on end? Which would be the better choice? __________________ '14 BRZ Limited \| SBD500X + HRI Tuning \| Tanabe Concept G Exhaust \| XXR 527 18x8.75 \| Hankook Ventus V12 EVO2 245/40/18

12-09-2015, 01:35 PM	#4
mcbrawr Member Join Date: Jun 2015 Drives: 2014 BRZ Limited Location: Southern Maryland Posts: 64 Thanks: 3 Thanked 12 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 2 Thread(s)	manual transmission. __________________ '14 BRZ Limited \| SBD500X + HRI Tuning \| Tanabe Concept G Exhaust \| XXR 527 18x8.75 \| Hankook Ventus V12 EVO2 245/40/18

12-09-2015, 03:52 PM	#10
mrk1 Senior Member Join Date: Mar 2013 Drives: Sterling BRZ Ltd Location: New England Posts: 1,702 Thanks: 403 Thanked 1,389 Times in 671 Posts Mentioned: 20 Post(s) Tagged: 2 Thread(s)	4.56 is very streetable and daily driveable, 4.88 is a bit more aggressive and maybe a little rough on a +5hr drive. __________________ The Build Thread GT28RS - eBoost2 - 3.91 Final Drive - Supra LSD

12-09-2015, 04:54 PM	#11
Sargy Long Distance Driver Join Date: Aug 2012 Drives: 2013 Scion FR-S Location: Northern VA Posts: 779 Thanks: 565 Thanked 312 Times in 207 Posts Mentioned: 43 Post(s) Tagged: 3 Thread(s)	Your at around 113 MPH when topping 5th gear. crusing speeds in 6th gear at 70-75mph is around 4K rpm. I drove to Toronto from Northern VA without any complaints. My Girlfriend was happily asleep. it all depends on the drivers needs and how loud the exhaust can be because the RPM will be higher most of the time. __________________ My TRD transformation build: http://www.ft86club.com/forums/showthread.php?t=38648

12-09-2015, 08:55 PM	#12
stevesnj Senior Member Join Date: May 2013 Drives: 2016 FR-S Oceanic Blue Location: Southern NJ Posts: 2,958 Thanks: 2,158 Thanked 1,601 Times in 923 Posts Mentioned: 30 Post(s) Tagged: 2 Thread(s)	Use this handy little calculator to get a more precise idea of the final ratio at the wheels with tire size. https://tiresize.com/gear-ratio-calculator/ __________________ My 2016 Build thread TRD Exhaust with custom quad tips, TRD Lowering Springs,TRD Quick shifter,LED;DRL, Projectors, and turn signals. Re-badge, 86 Nanny, WinmaxW2 Pads, K&N Drop In, Antenna delete

12-09-2015, 01:33 PM	#3
nikitopo Senior Member Join Date: Mar 2014 Drives: '15 BRZ RA Location: Greece Posts: 3,787 Thanks: 2,416 Thanked 1,944 Times in 1,261 Posts Mentioned: 29 Post(s) Tagged: 0 Thread(s)	You can calculate top speeds per gear here: http://www.apexgarage.com/tech/gear_ratios.shtml

12-09-2015, 02:57 PM	#5
swarb Senior Member Join Date: Sep 2014 Drives: BRZ Location: Los Angeles Posts: 3,053 Thanks: 1,773 Thanked 2,451 Times in 1,271 Posts Mentioned: 79 Post(s) Tagged: 0 Thread(s)	4.10 to 4.56 is pretty much 11% So if you are at 3k rpm at a given speed, 4.56 would be about 3,300rpm. Maybe that will help you imagine what rpm you would be at with a higher final drive. 4.88 is is about 18% Let me know if you find out the rpms at 80mph for all the different final drives. I am too lazy to check right now.

12-09-2015, 03:27 PM	#6
Foulsmell Member Join Date: Dec 2014 Drives: Gt86 Location: Great Britain Posts: 27 Thanks: 8 Thanked 15 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I went for 4.67 Mfactory on my DD M/T. It's perfect. Easier to drive than before due to the extra torque and comfortable cruising at higher speeds.

12-09-2015, 03:46 PM	#9
Foulsmell Member Join Date: Dec 2014 Drives: Gt86 Location: Great Britain Posts: 27 Thanks: 8 Thanked 15 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	It also depends on other mods. You won't need the 4.88 if you've got header exhaust etc for a DD I would say.

12-10-2015, 08:00 AM	#13
M1K3 Senior Member Join Date: Jun 2012 Drives: vrooom... Location: NOVA Posts: 260 Thanks: 287 Thanked 209 Times in 115 Posts Mentioned: 0 Post(s) Tagged: 3 Thread(s)	MFactory has a really good gear ratio calculator with a line graph for each gear: http://calc.teammfactory.com/index.php Here is a 4.56 vs 4.88 with 245/40/17 tires and stock 86 gears: 4.56vs4.88

12-10-2015, 09:11 AM	#14
mcbrawr Member Join Date: Jun 2015 Drives: 2014 BRZ Limited Location: Southern Maryland Posts: 64 Thanks: 3 Thanked 12 Times in 7 Posts Mentioned: 1 Post(s) Tagged: 2 Thread(s)	I guess my next question would be this: Looking at the MFactory gearing calculator, I will have to be in 5th gear to hit 100mph. With 4.88 gears how will 5th feel? Like 4th currently? __________________ '14 BRZ Limited \| SBD500X + HRI Tuning \| Tanabe Concept G Exhaust \| XXR 527 18x8.75 \| Hankook Ventus V12 EVO2 245/40/18

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