LSD from a Scion FRS into IS250 RWD automatic
#1
Driver School Candidate
Thread Starter
LSD from a Scion FRS into IS250 RWD automatic
Yes it works.
Tight corner exit much improved. No more flashing traction control light.
I am have IS300, Scion FRS, and IS250. They share the same pumpkin. final drive from FRS is 4.1
Tight corner exit much improved. No more flashing traction control light.
I am have IS300, Scion FRS, and IS250. They share the same pumpkin. final drive from FRS is 4.1
The following users liked this post:
EDUSAN (12-15-19)
The following users liked this post:
Yodog (02-08-24)
#4
It's great to see more IS250 clublexus owners taking advantage of the compatible IS300 or FR-S/BRZ differentials for their LSD performance upgrade. With the IS350, the options are more limited and significantly more expensive.
There's definitely a night and day difference between an open differential and a LSD and it's a shame a LSD isn't offered as an option for the 2IS or 3IS like it was for the IS300. Supposedly, the upcoming RC350 F-Sport will have a torsen LSD available as either an option or standard equipment so if that rumor is true, Lexus is moving in the right direction.
There's definitely a night and day difference between an open differential and a LSD and it's a shame a LSD isn't offered as an option for the 2IS or 3IS like it was for the IS300. Supposedly, the upcoming RC350 F-Sport will have a torsen LSD available as either an option or standard equipment so if that rumor is true, Lexus is moving in the right direction.
#5
Lexus Test Driver
What are all the benefits exactly from putting in a FRS/BRZ LSD?
Sorry for the "noob" question but I've always wondered what all the talk about LSD's were about
and also, what are the downfalls if any? lower MPG?
Sorry for the "noob" question but I've always wondered what all the talk about LSD's were about
and also, what are the downfalls if any? lower MPG?
#6
LSD will assist in ensuring that a wheel that has less grip or none at all doesn't receive the bulk of the power. This happens with open diffs and you lose some control and acceleration on spinning tires. LSD will take that power and apply it to the wheels with more grip, and an open diff will often waste power on wheels without grip. Helps a lot in acceleration and cornering.
#7
Moderator
iTrader: (10)
Downfalls? Tendency to push the envelope in the corners I guess.
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#13
I thought the final drive ratio was determined by the differential. At least in a car. No?
So I would have thought using this LSD in an IS350 would move the ratio from 4.083 to 4.1
Is that not correct? If it is correct, isn't that a pretty small change?
Actually, isn't that less change than you would get by changing the rear tires from
255/40/18 to 265/40/18? (which I quickly calculated to be a change of
tires 1.012 vs.
gears 1.0042 , but I may have done that incorrectly)
So I would have thought using this LSD in an IS350 would move the ratio from 4.083 to 4.1
Is that not correct? If it is correct, isn't that a pretty small change?
Actually, isn't that less change than you would get by changing the rear tires from
255/40/18 to 265/40/18? (which I quickly calculated to be a change of
tires 1.012 vs.
gears 1.0042 , but I may have done that incorrectly)
#14
I thought the final drive ratio was determined by the differential. At least in a car. No?
So I would have thought using this LSD in an IS350 would move the ratio from 4.083 to 4.1
Is that not correct? If it is correct, isn't that a pretty small change?
Actually, isn't that less change than you would get by changing the rear tires from
255/40/18 to 265/40/18? (which I quickly calculated to be a change of
tires 1.012 vs.
gears 1.0042 , but I may have done that incorrectly)
So I would have thought using this LSD in an IS350 would move the ratio from 4.083 to 4.1
Is that not correct? If it is correct, isn't that a pretty small change?
Actually, isn't that less change than you would get by changing the rear tires from
255/40/18 to 265/40/18? (which I quickly calculated to be a change of
tires 1.012 vs.
gears 1.0042 , but I may have done that incorrectly)
IS250 MT Final Drive = 3.91
IS250 AT Final Drive = 3.73
The 4.1 FD of the FRS differential will make a more noticable acceleration difference in the IS250 AT version.
#15
Thanks.
Some of this is my confusion. I thought
was aimed at the question on whether this would be suitable for the is350, but that was actually 2 questions posed by 2 people about 2 different things.
And here I was hoping I had another option to explore for an LSD.
Some of this is my confusion. I thought
Was this question aimed at the LSD or the FD (final drive)?
And here I was hoping I had another option to explore for an LSD.