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Does anyone know what would be involved in swapping the 15-19 differential ratio to the newer 2020 3.13 ratio? Lexus part number for the “3.13 final gear kit” is 41201-59285.
Part number for the stiffer engine mount is 12371-38180. Description says it’s a “rear engine mount”. I wonder how much of a difference this would make paired with RR or FIGS engine mounts.
Couldn’t find part numbers for the other things listed. If you know the part numbers, lmk and I’ll update this post.
If all of the things listed could be swapped into older RCF’s that would make for awesome OEM upgrades
It is the same car with small updates. All parts are 100% swappable. The aftermarket parts like RR racing are most likely stiffer so if someone wants aftermarket bushings/mounts, RR racing would give a more noticeable difference.
Personally, PSS tires were the biggest gripe when I bought my RCF. I solved it by getting more aggressive XL Pilot Sport 4S tires and it improved everything. Steering feel, road feel, sidewall rigidity etc. Initially I was planning on getting the RR racing ultimate steering response bushings (USRS) as my next mod, but recently with the new tires I am having second thoughts as the tires have improved the feel/response of the steering quite significantly. I might still end up getting RR racing USRS bushings next year, but I am less determined than I was when I had the OEM Pilot Super Sport.
Does anyone know what would be involved in swapping the 15-19 differential ratio to the newer 2020 3.13 ratio? Lexus part number for the “3.13 final gear kit” is 41201-59285.
Part number for the stiffer engine mount is 12371-38180. Description says it’s a “rear engine mount”. I wonder how much of a difference this would make paired with RR or FIGS engine mounts.
Couldn’t find part numbers for the other things listed. If you know the part numbers, lmk and I’ll update this post.
If all of the things listed could be swapped into older RCF’s that would make for awesome OEM upgrades
Im not sure the rear diff part number is correct.
I think this is what you are looking for.
I don’t think you need the whole diff assembly, the part number I listed was the “gear kit” which I assume is just taking apart the 2.93 gears and installing the 3.13 gears. Not sure though but if it requires spending 4k to get just a little better acceleration then I’ll pass lol
I was going to say as well...when you re-gear an offload vehicle for larger tires, it is only about
$3000.00 and all that is put in the differential is a new gear and pinion.
Not sure what all is needed but I would just think your need 1 new gear sprocket I can't imagine is will run over $4,000. bucks..
airlaird
I was going to say as well...when you re-gear an offload vehicle for larger tires, it is only about
$3000.00 and all that is put in the differential is a new gear and pinion.
Not sure what all is needed but I would just think your need 1 new gear sprocket I can't imagine is will run over $4,000. bucks..
airlaird
yeah I figured the $800 gear kit was just a new gear and pinion and would just need to be swapped over. I wanted to ask just to be sure and share the info to anyone else wondering
The acceleration is similar based on the tests. C&D did 4.1 seconds 0-60 mph with the 2020, which is similar to what the best in 2015 - 2019 was achieved. 1/4 mile was the same. A shorter final drive will help the car get off the line a bit quicker and get to redline a bit quicker. However, once you are rolling, the differences will be negligible since with shorter gearing comes shorter speed range/gear.
A shorter final drive also helps on the track where there is less need to downshift in the slower turns. For example, one can use 3rd gear more effectively with shorter gearing in a 25 - 30 mph turn where the 2015 - 2019 will have to be in 2nd gear to make sure it can power out of turn as quickly as possible.
One can achieve similar effect by two other much cheaper ways. One is by slightly reducing overall rear wheel/tire circumference or get a throttle controller like sprint booster etc., which allows earlier access to all of the throttle in the first few inches of the throttle pedal by opening the full 100% throttle body with a slight press of the pedal.
The acceleration is similar based on the tests. C&D did 4.1 seconds 0-60 mph with the 2020, which is similar to what the best in 2015 - 2019 was achieved. 1/4 mile was the same. A shorter final drive will help the car get off the line a bit quicker and get to redline a bit quicker. However, once you are rolling, the differences will be negligible since with shorter gearing comes shorter speed range/gear.
A shorter final drive also helps on the track where there is less need to downshift in the slower turns. For example, one can use 3rd gear more effectively with shorter gearing in a 25 - 30 mph turn where the 2015 - 2019 will have to be in 2nd gear to make sure it can power out of turn as quickly as possible.
One can achieve similar effect by two other much cheaper ways. One is by slightly reducing overall rear wheel/tire circumference or get a throttle controller like sprint booster etc., which allows earlier access to all of the throttle in the first few inches of the throttle pedal by opening the full 100% throttle body with a slight press of the pedal.
Yes they are similar of course, and the difference could be rather negligible but I wanted to bring up the topic because there’s no aftermarket way to shorten TVD final drive. This oem upgrade gives TVD owners a way to keep TVD and get through first gear quicker than most other RCF’s and gives a slightly better advantage against other lighter cars. Non TVD owners can choose to swap over to the 2IS/4GS differential that I think is a 4.083/3.769 ratio. The two other options you mention are not that cheap either and would not be even upgrading anything. The smaller diameter wheel/tire combo would throw off your speedometer and would not make much difference unless you downsize a lot and run tires that are too small to be used for daily use and spirited driving. The throttle controller is merely a gimmick that could otherwise mess up your throttle position sensor. I know you mean well and I appreciate your thoughts but the right way to do things is almost always the better way.
10-06-20, 04:45 PM
2020 RCF parts compatible with 15-19
