My final gear swap project - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

qoncept · 08-28-2013, 01:11 PM

Quote:

Originally Posted by TouchMyHonda

WOW! the 5.71 would literally kill drivability 1-3.... it would be SOOO annoying.

Literally.

Captain Insano · 08-28-2013, 05:32 PM

Thanks 37... yeah that pretty much made up my mind. 4.9 is about as high as I want to go. Er short mean.

8686 · 08-28-2013, 05:50 PM

Just drove my car around the block. Difinitly accelerate better. Mostly in 1-3 the gears are shorter than before. My guess, is gears became like MT from 1-3. Need to drive it on the high way to test 4-6 gears. I am very satisfied with this change.

Sent from my iPhone using Tapatalk - now Free

Jeff Lange · 08-28-2013, 06:44 PM

Quote:

Originally Posted by PantsDants

It's odd that 41110-30A03 is even listed as a part for the FR-S; I saw it on a few different sites. All I was really getting at was this is further evidence of cross-compatibility between the cars.

The parts catalog for the ZN6 that includes the North American FR-S is not exclusively for the FR-S, it includes some GT-86 models as well.

It has things listed like auto-leveling HID headlights, factory rear spoilers, Toyota emblems, etc. all listed in the catalog even though none of those parts apply specifically to the FR-S.

There are various grade levels in the FR-S catalog (ZN6 Catalog No. 264410), BASE and HIGH are GT86 models, STD is the FR-S and LIMD is the FR-S 10-Series.

Knowing how to read the catalogs is important if you're going to try to use them.

41110-18020 and 18021 are the 4.10:1 with Torsen LSD
41110-30A02 and 30A03 are the 4.10:1 with preload non-LSD
41110-53203 and 53204 are the 3.73:1 with preload non-LSD

The non-LSD models actually have a preload mechanism to provide a small amount of limited slip at low speeds. Toyota/Lexus usually refer to these as Semi-LSD. They are not used on any North American FR-S models.

EDIT: If you're looking for complete pumpkins that will bolt-in complete for the FR-S, here's a list of part numbers if you're interested, these are all the newest change-up part numbers:

41110-53163 - 3.58:1 Open
41110-53192 - 3.58:1 Semi-LSD
41110-53143 - 3.58:1 Torsen LSD
41110-3A144 - 3.73:1 Open
41110-53204 - 3.73:1 Semi-LSD
41110-53151 - 3.73:1 Torsen LSD
41110-30863 - 3.91:1 Open
41110-53224 - 3.91:1 Semi-LSD
41110-53102 - 3.91:1 Torsen LSD
41110-30A03 - 4.10:1 Semi-LSD
41110-18021 - 4.10:1 Torsen LSD

Jeff

PantsDants · 08-28-2013, 11:36 PM

41110-53102 is the one I bought for this project.

PantsDants · 09-03-2013, 08:36 PM

Alright I'm back. The car performed beautifully through the mountain passes at high speeds. Nothing too irresponsible but I did scare the girlfriend a couple times.

Now for business: Half my install parts and my gear oil (went with Redline 75w90) are here! The rest should be here by the end of the week. I'll be placing an order with Spence tomorrow after I finally nail down exactly what ratio I want; I need to play with the calculator some more.

Nightbringer · 09-03-2013, 09:17 PM

Torn between 4.88's and 5.29's here as well. Definitely comment on your impressions after you decide. I'm pretty comfortable turning 3000 rpm on the highway

37 · 09-03-2013, 09:25 PM

Judging purely by the math, the 4.88 gets my vote without hesitation.

FirestormFRS · 09-03-2013, 10:56 PM

Quote:

Originally Posted by PantsDants

Any guesses as to why the part numbers are different between AT and MT? They both have the same final gear ratio...

In general any Toyota part with a letter in the number is North American sourced part. So those without a letter are Japanese sourced.

Porsche · 09-03-2013, 11:13 PM

Quote:

Originally Posted by PantsDants

I'll be placing an order with Spence tomorrow after I finally nail down exactly what ratio I want; I need to play with the calculator some more.

Your speeds at 3000 rpm are a couple mph too high. The calculator "computes" the nominal wheel/tire diameter.

OEM Michelin Primacy tire diameter = 23.896"

Plug in the above number to compute more accurate speeds for a given rpm.

For any tire the actual rolling diameter will be less because the car squishes the tire down, which makes it effectively smaller in diameter. Go to the manufacturer's website and/or Tire Rack and check the tire specs. You want the revolutions per mile, which for the OEM Primacy tire = 844. From that you can compute the rolling diameter, which will be a lot closer to reality when it's mounted on your car.

63,360/844/pi=23.89589"

π=3.14159

PantsDants · 09-03-2013, 11:18 PM

I think I've completely decided on 4.88. It essentially makes the A/T in gears 1-3 the same as the M/T with a 4.67 (thanks @37), and allows for cruising on the freeway (~65 mph) at 2500 rpm.

I'll be placing my order tomorrow. Thanks again for all of the great information guys! Updates will come when I have everything together and schedule with the diff shop.

Nightbringer · 09-03-2013, 11:34 PM

Second the thanks to 37, sad I can only hit the button once. :P I had a gear calculator, but it's slick being able to do the side by side graphs.

Also I know it's been answered in one of these threads, but I'm OCD and just wanted to reaffirm from the people who've already gotten this installed: No issues with speedo or anything else? Or will this alteration require a tweak in the map?

37 · 09-04-2013, 12:59 AM

Quote:

Originally Posted by PantsDants

I think I've completely decided on 4.88. It essentially makes the A/T in gears 1-3 the same as the M/T with a 4.67 (thanks @37), and allows for cruising on the freeway (~65 mph) at 2500 rpm.

Sure thing. I hope the 4.88 works and am curious to see how things turn out. The math is definitely there. Hopefully your results match.

Quote:

Originally Posted by Nightbringer

Also I know it's been answered in one of these threads, but I'm OCD and just wanted to reaffirm from the people who've already gotten this installed: No issues with speedo or anything else? Or will this alteration require a tweak in the map?

np. The speedo works off of a wheel speed sensor and isn't affected by the final drive. Mine didn't change at all. I confirmed speeds before and after using GPS as I too was concerned they might change. Nope!

.

PantsDants · 09-05-2013, 04:41 AM

I placed an order with Spence today for the 4.88 ring and pinion. He wasn't sure if he had it on the shelf, but could get it in a couple days if not. I also bought his shim kit because it was only $15 and takes another aspect of uncertainty out of the equation.

I should have the rest of my installation bits by Friday, and I'm guessing the ring and pinion will be here sometime next week, so hopefully I can really get the project started soon!

08-28-2013, 05:50 PM	#59
8686 Senior Member Join Date: Apr 2013 Drives: 86 Location: SA Posts: 364 Thanks: 395 Thanked 116 Times in 81 Posts Mentioned: 5 Post(s)	Just drove my car around the block. Difinitly accelerate better. Mostly in 1-3 the gears are shorter than before. My guess, is gears became like MT from 1-3. Need to drive it on the high way to test 4-6 gears. I am very satisfied with this change. Sent from my iPhone using Tapatalk - now Free __________________ VOLK LE37 17X7.5, SWIFT Springs, Bilstein B8, HKS intake duct, Cosworth Air Filter, HKS headers, PLM Over Pipe, EVS Down Pipe & Exhaust, FD 4.55, GFB pulleys, Axle-Exchange Drive Shaft, Mishimoto oil cooler, Cusco F&R strut bar, TRD door stabilizer, Innovate SC, Delicious Tuned

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08-28-2013, 05:32 PM	#58
Captain Insano Senior Member Join Date: Sep 2012 Drives: 2014 Jeep Wrangler RubiconX Location: Midwest, USA Posts: 1,282 Thanks: 110 Thanked 292 Times in 224 Posts Mentioned: 7 Post(s)	Thanks 37... yeah that pretty much made up my mind. 4.9 is about as high as I want to go. Er short mean.

08-28-2013, 11:36 PM	#61
PantsDants Senior Member Join Date: Jul 2013 Drives: Scion FR-S A/T, Whiteout Location: Seattle Posts: 334 Thanks: 57 Thanked 221 Times in 90 Posts Mentioned: 16 Post(s)	41110-53102 is the one I bought for this project.

09-03-2013, 08:36 PM	#62
PantsDants Senior Member Join Date: Jul 2013 Drives: Scion FR-S A/T, Whiteout Location: Seattle Posts: 334 Thanks: 57 Thanked 221 Times in 90 Posts Mentioned: 16 Post(s)	Alright I'm back. The car performed beautifully through the mountain passes at high speeds. Nothing too irresponsible but I did scare the girlfriend a couple times. Now for business: Half my install parts and my gear oil (went with Redline 75w90) are here! The rest should be here by the end of the week. I'll be placing an order with Spence tomorrow after I finally nail down exactly what ratio I want; I need to play with the calculator some more.

09-03-2013, 09:17 PM	#63
Nightbringer Senior Member Join Date: Apr 2013 Drives: Scion FR-S Location: Nowhere Posts: 346 Thanks: 175 Thanked 211 Times in 120 Posts Mentioned: 2 Post(s)	Torn between 4.88's and 5.29's here as well. Definitely comment on your impressions after you decide. I'm pretty comfortable turning 3000 rpm on the highway

09-03-2013, 09:25 PM	#64
37 degrees Join Date: Mar 2013 Drives: 6MT BRZ Location: Shifting Posts: 157 Thanks: 132 Thanked 141 Times in 72 Posts Mentioned: 10 Post(s)	Judging purely by the math, the 4.88 gets my vote without hesitation.

09-03-2013, 11:18 PM	#67
PantsDants Senior Member Join Date: Jul 2013 Drives: Scion FR-S A/T, Whiteout Location: Seattle Posts: 334 Thanks: 57 Thanked 221 Times in 90 Posts Mentioned: 16 Post(s)	I think I've completely decided on 4.88. It essentially makes the A/T in gears 1-3 the same as the M/T with a 4.67 (thanks @37), and allows for cruising on the freeway (~65 mph) at 2500 rpm. I'll be placing my order tomorrow. Thanks again for all of the great information guys! Updates will come when I have everything together and schedule with the diff shop.

09-03-2013, 11:34 PM	#68
Nightbringer Senior Member Join Date: Apr 2013 Drives: Scion FR-S Location: Nowhere Posts: 346 Thanks: 175 Thanked 211 Times in 120 Posts Mentioned: 2 Post(s)	Second the thanks to 37, sad I can only hit the button once. :P I had a gear calculator, but it's slick being able to do the side by side graphs. Also I know it's been answered in one of these threads, but I'm OCD and just wanted to reaffirm from the people who've already gotten this installed: No issues with speedo or anything else? Or will this alteration require a tweak in the map?

09-05-2013, 04:41 AM	#70
PantsDants Senior Member Join Date: Jul 2013 Drives: Scion FR-S A/T, Whiteout Location: Seattle Posts: 334 Thanks: 57 Thanked 221 Times in 90 Posts Mentioned: 16 Post(s)	I placed an order with Spence today for the 4.88 ring and pinion. He wasn't sure if he had it on the shelf, but could get it in a couple days if not. I also bought his shim kit because it was only $15 and takes another aspect of uncertainty out of the equation. I should have the rest of my installation bits by Friday, and I'm guessing the ring and pinion will be here sometime next week, so hopefully I can really get the project started soon!

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