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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain.


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Old 05-27-2015, 04:48 PM   #57
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so its just cheaper to go with the is300 then?
It's more convenient.. I doubt you would need new bearings if you used your stock pumpkin. Most people will get the IS300 pumpkin because it's nice to work on it nice and slow. Especially when it comes time to shim and measure and shim and measure and shim and measure and...

Did you read what @Dustin has done? http://www.ft86club.com/forums/showthread.php?t=54054
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Old 05-27-2015, 08:49 PM   #58
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so its just cheaper to go with the is300 then?
Nope. I think he is thinking that you buy the IS300 pumpkin and direct swap it. However, IS300 final drive ratios for both LSD options are lower than ours, great for FI, terrible for NA. Going to a higher final drive ratio in NA will give you an acceleration boost (at least it will feel that way). You'll have to shift quicker, but it won't feel too bad and likely worth it. Obviously a turboed car would also benefit from the boost in acceleration, but again, you may hit the top end of your shift really quickly. This is something a lot of turboed people experience on even the stock 4.10 final drive, so they will go with a 3.7/3.9 that the IS300 has.

So if you are staying NA, taking your current car/pumpkin to a shop would be cheaper than buying a new pumpkin and having them rebuild it for you. Especially if they reuse the bearings on the current setup, which they should be able to.
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Old 05-28-2015, 02:38 PM   #59
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So if you are staying NA, taking your current car/pumpkin to a shop would be
cheaper than buying a new pumpkin and having them rebuild it for you. Especially
if they reuse the bearings on the current setup, which they should be able to.
this is what i was looking for. car only has 10xxxK so everything is realitivly new still
im NA and just wanted to know 'WHEN CHANGING THE FD' which route is cheaper because everyone seems to buy a new pumpkin first regardless of the FD they pick
INSTEAD of just putting it in the 86 pumpkin
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Old 05-28-2015, 02:43 PM   #60
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Originally Posted by fika84 View Post
It's more convenient.. I doubt you would need new bearings if you used your stock pumpkin. Most people will get the IS300 pumpkin because it's nice to work on it nice and slow. Especially when it comes time to shim and measure and shim and measure and shim and measure and...

Did you read what @Dustin has done? http://www.ft86club.com/forums/showthread.php?t=54054
i did see this yes. my only concern was will it 100% fit
i know the IS300 and 86 pumpkin are the same part #
so yes it should fit no problem, but because everyone seems to be doing it in a new carrier it just has me a little concerned that for some reason it might not work
or i was missing something as to why its better to get a new carrier
i would be taking it to a shop and have another vehicle to get around so down time was never an issue for me
i just didnt want to spend the extra time and $300+ looking for pumpkin if i didnt have to
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Old 05-28-2015, 03:39 PM   #61
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Quote:
Originally Posted by Top-Secret View Post
this is what i was looking for. car only has 10xxxK so everything is realitivly new still
im NA and just wanted to know 'WHEN CHANGING THE FD' which route is cheaper because everyone seems to buy a new pumpkin first regardless of the FD they pick
INSTEAD of just putting it in the 86 pumpkin
You absolutely can have the gears swapped into your existing carrier. I got the IS300 carrier as insurance against something going wrong with the installation, as well as to minimize my car's downtime while the shop was installing the gears, and I'm glad I did because that took a while.

Now if you're just looking to go taller for FI, simply swapping a whole IS300 carrier in is the most cost effective way to do it. There's no need to modify it at all; it's a straight swap. Keep in mind a junkyard unit may need a rebuild depending on its condition though.
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Old 05-28-2015, 07:17 PM   #62
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i live on a tiny little island in canada, getting a new carrier would not be cheap or easy
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Old 08-08-2015, 10:02 AM   #63
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I have an AT, and I really would like to add the 4.88's.!!


I was wondering if you are able to calibrate the speedometer after this?


I know after changing gears the speedometer can be really off. I have contacted some reputable (3 competent) shops in my area and they weren't able to fix this. I was quite surprised.


Any recommendations on how to fix the speedometer problem? This was one of the biggest issues I had that prevented me from doing the swap.
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Old 08-08-2015, 11:58 AM   #64
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I have an AT, and I really would like to add the 4.88's.!!


I was wondering if you are able to calibrate the speedometer after this?


I know after changing gears the speedometer can be really off. I have contacted some reputable (3 competent) shops in my area and they weren't able to fix this. I was quite surprised.


Any recommendations on how to fix the speedometer problem? This was one of the biggest issues I had that prevented me from doing the swap.
There is no speedometer problem. These cars use the ABS (wheel speed) sensors to determine vehicle speed, not a dedicated sensor in the transmission. Since changing the final drive doesn't change wheel diameter, the speedometer is not affected.
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Old 08-08-2015, 09:22 PM   #65
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Yup, no speedometer problems changing FD. Only issue I've ever heard of is gear number indicator no longer accurate for MT.
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Old 08-08-2015, 09:53 PM   #66
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There was gear number indicator of MT? :/
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Old 08-08-2015, 11:04 PM   #67
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There is no speedometer problem. These cars use the ABS (wheel speed) sensors to determine vehicle speed, not a dedicated sensor in the transmission. Since changing the final drive doesn't change wheel diameter, the speedometer is not affected.


Thanks for that!!! Looks like I got something new on the list. Thanks!


I was actually quite surprised to hear reputable companies not have this answer.


I like the idea 0f a 4.88
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Old 08-09-2015, 12:35 PM   #68
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There was gear number indicator of MT? :/
Yup, have it enabled on mine
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Old 08-09-2015, 12:57 PM   #69
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I recently picked up a entire 3.91 open diff from a IS300 for $99. I'm going to swap it in as is to try out the ratio. If I like it I'll pull it apart and swap the ring and pinion into one of my brz diffs. I already have one I rebuilt with the Weir Rebuild kit.

Shelling out for a shim kit is paying off given how often I change and tinker with my car.
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Old 11-24-2015, 03:46 PM   #70
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Does anyone have a link to the part # for the pinion bearings?
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