IS F (2008-2014) Discussion topics related to the IS F model

RC-F Differential into IS-F?

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Old 09-28-16, 02:12 PM
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Supraman16
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Default RC-F Differential into IS-F?

Curious if the RC-F differential/carrier with LSD (non-torque vectoring version) fits into a ISF, specially the 2008/09 F's that don't have a LSD. Any thoughts...
Old 09-28-16, 02:29 PM
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idoke1
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I am very curious as well. Maybe someone can help us
Old 09-28-16, 02:51 PM
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I8ABMR
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Why not just get the correct one. The LSD is not a part that evolves very quickly unless it's some fancy system like TVD.
Old 09-28-16, 03:40 PM
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liquidtek
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Originally Posted by I8ABMR
Why not just get the correct one. The LSD is not a part that evolves very quickly unless it's some fancy system like TVD.
I'd be interested in knowing as well. It would be nice to have more options as its very rare to find a wrecked 10+ ISF with a LSD available.
Old 09-28-16, 07:38 PM
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j3ff
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I'd say there's more 2010+ isf diffs available than rcf's..but if it does fit I guess it would increase your chances of finding an OEM diff.

that being said, I'd be interested to know if the tvd could possibly fit? The rear of the rc does come from the IS chassis but it'll take a lot more to know if it fits.
Old 09-28-16, 08:34 PM
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yardie876
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Originally Posted by j3ff
I'd say there's more 2010+ isf diffs available than rcf's..but if it does fit I guess it would increase your chances of finding an OEM diff.

that being said, I'd be interested to know if the tvd could possibly fit? The rear of the rc does come from the IS chassis but it'll take a lot more to know if it fits.
Getting it to fit would be the easy part. Handling the electronic side would be near impossible IMO. Integrating it into the ISF VDIM system would not work and I highly doubt the computer from the RCF would integrate into the ISF effectively.
Old 09-28-16, 10:05 PM
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autoz4me
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If I owned a pre 2010 model I'd have a good look at a Drexler/TRD diff option.

I know Green-line Performance parts in Japan sell them.

There about $4300 odd USD expensive but I'm pretty sure they might be a bit better than the Torsen you all after though.
Old 09-29-16, 08:23 AM
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lobuxracer
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Originally Posted by autoz4me
If I owned a pre 2010 model I'd have a good look at a Drexler/TRD diff option.

I know Green-line Performance parts in Japan sell them.

There about $4300 odd USD expensive but I'm pretty sure they might be a bit better than the Torsen you all after though.
OS Giken Super Lock is cheaper and one of the best available. No idea why you would spend more money for a TRD branded item.

The Torsen spool inside the housing, 41301-53051, is identical - that spool is used on the ISF, RCx, and LS460 F Sport - but the differential assemblies all have different part numbers. This means it might fit and it might not. Even if it doesn't fit, if you got the diff from any of these models, you would be able to swap spools into your ISF differential case successfully.

Last edited by lobuxracer; 09-29-16 at 11:13 AM.
Old 09-29-16, 11:14 AM
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autoz4me
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Originally Posted by lobuxracer
OS Giken Super Lock is cheaper and one of the best available. No idea why you would spend more money for a TRD branded item.

The Torsen spool inside the housing is identical - that spool is used on the ISF, RCx, and LS460 - but the differential assemblies all have different part numbers. This means it might fit and it might not. Even if it doesn't fit, if you got the diff from any of these models, you would be able to swap spools into your ISF differential case successfully.
Personally because I know the TRD/Drexler item will be a really good product.

I know for sure with previous experience using this brand that all there product works really well and is built for the car.

Drexler the German crowd who built this diff for the IS-F are a very respected maker of this product and make diffs for many different models of car and have a respected name in the race industry also.

Just a few things why some F owners may want to try this option.
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Old 09-29-16, 12:03 PM
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Jerry_Supra
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Why anyone would be willing to pay almost double for the LSD is beyond me. OS Giken is a well respected brand in the Japanese car scene. And I would trust Lobuxracer's knowledge because he has one, installed one and also trackday one.
Old 09-29-16, 12:43 PM
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autoz4me
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Originally Posted by Jerry_Supra
Why anyone would be willing to pay almost double for the LSD is beyond me. OS Giken is a well respected brand in the Japanese car scene. And I would trust Lobuxracer's knowledge because he has one, installed one and also trackday one.
I'm sure it is.

All I'm saying is as mentioned it's another option to look at is all.
Old 09-29-16, 12:46 PM
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Gearbangin
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Maybe good luck finding one. I picked up an 2011 ISF Carrier from the wreckers and it took forever to find. Now it was the best 1500 I spent on the car so well worth it!
Old 09-29-16, 01:10 PM
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Jerry_Supra
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Out of curiosity, how much would a used stock 2012 LSD go for?
Old 09-29-16, 07:31 PM
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flowrider
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^^^^Did you not read the post just above yours

Lou
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Old 09-30-16, 01:59 PM
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Max16
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ATS Carbon is even cheaper than OS Giken,
I'm running one since 4k miles and super happy with it.


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