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Interesting. Its nice to know this option is a available. I was surprised to see the adapter pushes the caliper outward laterally. I just “assumed” RCF/GSF calipers didnt work because of the diameter, so would have thought they would need to be pushed out posteriorly.
-R
I wonder if leaving the stock rear size and going from the 360mm front to the 380mm rotors and gsf caliper would create in imbalance issue as far as braking goes. To bad the rear gsf caliper doesn’t work on the ISF.
Our IS-F rear brake caliper upgrade kit for the IS-F utilizes the awesome Wilwood Forged Superlite 4 piston Caliper. This caliper upgrade allows for a huge variety of low-cost rear brake pad options for the ISF. Standard 2 piston rear Brembos are highly limited in costly brake pad options. Additionally, our kit increases rear brake bias which we have found to be effective at the track, especially when coupled with a rear wing/spoiler for down force.
This kit includes the calipers, optional stainless steel brake lines, Wilwood pads, and adopter brackets. This kit DOES NOT include rotors. Please note that this kit requires ISF or RCF rear rotors.
If I didn't already have RB rotors, the GS F/RC F rotors would be nice. Swapping calipers is a waste of time IMHO, unless you go with the Wilwood setup simply because it's definitely lighter. There is no reason to believe the Brembo OEM calipers are inadequate for the car unless you force VDIM to rein in your bad driving (AMHIK) on the track. You'll never, ever need what the later model caliper offer on an IS F even with heavy track use. Every instructor at the track who rode in my car was very impressed with the braking from the factory (with full race pads). The only thing you can do is lower the unsprung weight and maintain the capability of the OEM setup for an improvement.
If you want the RC/GS F calipers because they look cool, go for it. Don't believe for a second you need what they offer even on a very brake intensive course, and you might actually be unhappy with the unsprung weight increase.
If I didn't already have RB rotors, the GS F/RC F rotors would be nice. Swapping calipers is a waste of time IMHO...
Totally agree, solely for bling factor, which is probably 99% of us here (myself included), youd be better off investing in good tires if stopping is your concern.
-R
If I didn't already have RB rotors, the GS F/RC F rotors would be nice. Swapping calipers is a waste of time IMHO, unless you go with the Wilwood setup simply because it's definitely lighter. There is no reason to believe the Brembo OEM calipers are inadequate for the car unless you force VDIM to rein in your bad driving (AMHIK) on the track. You'll never, ever need what the later model caliper offer on an IS F even with heavy track use. Every instructor at the track who rode in my car was very impressed with the braking from the factory (with full race pads). The only thing you can do is lower the unsprung weight and maintain the capability of the OEM setup for an improvement.
If you want the RC/GS F calipers because they look cool, go for it. Don't believe for a second you need what they offer even on a very brake intensive course, and you might actually be unhappy with the unsprung weight increase.
Are GSF/RCF rotors swappable with the stock calipers?
Every instructor at the track who rode in my car was very impressed with the braking from the factory (with full race pads). The only thing you can do is lower the unsprung weight and maintain the capability of the OEM setup for an improvement.
If you want the RC/GS F calipers because they look cool, go for it. Don't believe for a second you need what they offer even on a very brake intensive course, and you might actually be unhappy with the unsprung weight increase.
110% agree... FWIW, riding along w/Rafi in RR Racing's IS-F at CoTA (just as Covid started) showed me the most incredible braking I've ever experienced, a close second only to my buddy's P1 that held the road car lap record there for a while... super psyched to finally have wing/slicks on for a similar feel in my own car soon.
Are you staying with the PMu's and RB rotors after seeing them destroyed so quickly like mine did? I already had a backup set of HC800's, so I'm giving them another shot with the rotors swapped to their "correct" L/R orientation. Time will tell...
... the Ferodo DS2500 front and Project Mu HC+800 rear package strikes a very nice balance of price for performance and street manners. We were doing so many orders for Ferodo fronts with the Project Mu rears that we just put a package deal together: FERODO DS2500 FRONT & PROJECT MU HC+800 REAR LEXUS IS-F PACKAGE SPECIAL
Placed an order for the @flowrider pad recipe this afternoon. Replacing EBC Yellow pads with rears @ 20% remaining and rotors near the service limit. I have had two good experiences with EBC Yellows on lighter FWD cars, but I am starting to wonder if they do not do as well on heavier cars with full monoblock/fixed caliper systems.
07-27-20, 04:23 PM
