Question about manual lsd in auto IS300 - Page 2 - Lexus IS Forum
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post #16 of 28 (permalink) Old 10-12-2010, 10:41 AM
Yay! Old stuff!
 
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Nice. Thanks Gregski

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post #17 of 28 (permalink) Old 10-18-2010, 09:00 PM
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Any other opinions on this?? I'm also looking to stick a manual LSD into my open diff auto. How significant was the effect, performance and mileage? Does anyone one have real before after data to back this up, i.e dyno and evaluated mileage?
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post #18 of 28 (permalink) Old 10-19-2010, 12:49 AM
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I've been running a manual LSD as a replacement for my open auto diff. There doesn't seem to be much of a difference in acceleration. The benefits of the LSD are probably enough to offset any loss in torque. Plus you do have the torque converter to help off the line.
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post #19 of 28 (permalink) Old 10-19-2010, 06:24 AM
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Could always make up for the taller gear with a power adder! Turbos will love the taller gears, more time in boost. I did this on my old 240sx, went from a 4.10 rear end to a 3.69. If it was stock it would have sucked! but if you have extra power, it will more than make up for it. I enjoyed my other car much more with the taller gearing paired with boost. Its less about ":will this one mod offset my slowness and/or short comings", its more "will this mod compliment where i am going with this build and support my other done and future modifications." ask that to yourself and then decide of you want to swap the rear end for another. If you are n/a you will need the shorter gears.

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post #20 of 28 (permalink) Old 10-22-2010, 03:24 PM
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A shorter gear will also hurt your wallet at the pump. No point in it really.
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post #21 of 28 (permalink) Old 07-10-2014, 09:21 PM
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I think it's been asked before but I can't find a clear, exact answer. Is the only thing I need to swap a manual lsd into an open diff e shift the differential itself? What about if I manage to find an auto lsd?
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post #22 of 28 (permalink) Old 07-10-2014, 09:32 PM
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I know I need the whole carrier but what exactly does that mean can someone post a picture.
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post #23 of 28 (permalink) Old 07-10-2014, 11:40 PM
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All you NEED is the ring gear if you are trying to change your gear ratio.

But whenever you change the ring gear, you need to get your backlash checked and set.

The carrier is also refered to as the pumpkin.

This is a complete one.


I just removed my manual lsd in favor of an auto diff. I'm interested to see how it performs.
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post #24 of 28 (permalink) Old 07-11-2014, 10:46 AM
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thanks a lot. let me know if the auto diff gearing makes a huge difference. I haven't been able to find those for sale since they're rare so i don't want to make my gear ratio noticeably longer.
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post #25 of 28 (permalink) Old 07-16-2014, 08:52 PM
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Took the car for a test drive, and the final drive change was noticeable. I'm definitely happy with the change. I haven't driven it on the freeway other than for a mile, and I forgot to pay attention to cruising speeds. But it certainly didn't catch my attention. I'll post up more later on once I get the chance.
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post #26 of 28 (permalink) Old 07-16-2014, 11:23 PM
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Quote:
Originally Posted by BlvckMoon View Post
Took the car for a test drive, and the final drive change was noticeable. I'm definitely happy with the change. I haven't driven it on the freeway other than for a mile, and I forgot to pay attention to cruising speeds. But it certainly didn't catch my attention. I'll post up more later on once I get the chance.
Nice, so your car is a 5MT that came with the M85 (Manual)
LSD and you swapped it for an M98 (Auto) LSD?

Please share your further findings

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Originally Posted by RUCKER52 View Post
Although I saw the automatic gearbox, you should definitely be putting those paddle shifters to use. As long as you're strictly driving around and shifting with the paddle shifters you can tell everyone it's a manual, it'll increase the value of the car too.
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post #27 of 28 (permalink) Old 07-17-2014, 10:29 AM
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I also switched to the auto 3.91 ratio last year when I installed my TRD LSD. It's a noticeable if you know your car/gearing well, but its not like day and night huge difference.

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post #28 of 28 (permalink) Old 07-26-2014, 02:45 AM
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Nice, so your car is a 5MT that came with the M85 (Manual)
LSD and you swapped it for an M98 (Auto) LSD?

Please share your further findings
Yes, came with the m85 lsd, and I swapped it for the ring and pinion off of an M96 (open auto).

Finally got a chance to drive the car for more than a couple minutes after an alignment.

Acceleration is peppier, and at 65mph, cruising rpm is 3k.

So by no means is the car louder or feeling as if it is geared like a jack rabbit while on the freeway. Plus passing power is a little bit better thanks to the higher gearing and sitting closer to the powerband.
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