bgoetz

I have the SBG rear BBK, but am using the URGE rear rotors. I purchased the rotors then came across the BBK. I feel like the SBG kit definitely increased front bias and am investigating options to increase rear bias as inexpensivelyas possible and one thing that came to mind is a different rear caliper that might easily bolt up. I am figuring it would need to come from another Honda/Acura, possibly an NSX rear?? I just didn't know if anyone knew of a good resource to investigate this more without going out and buying a bunch of various calipers.

i know SBG makes an option but the bias change isn't terribly noticeable and I spent $700 on the dang URGE rears, so I kinda want to try to make those work.

bgoetz

Disregard, I am thinking that I am jumping the gun a bit and need to work with this setup and perhaps a different pad selection (I used DS2500s which are not true track pads). From there if I still feel the need for rear bias then maybe I can revisit this idea. The more I am reading though the more it seems front bias isn't necessarily a bad thing, especially with a square setup. Currently I am staggered, so maybe even trying a square setup before making a decision isn't a bad idea.

Bullwings

You answered your own question, but yes, I agree with you. Play with pad compounds first. I'd suggest going same compound F/R with a true track pad. The DS2500 would still fall under the aggressive street category that is trackable.

What pad are you running up front?

bgoetz

I was running the DS2500 all around, only because they came with the BBK and I wanted to see if they would work given the better cooling, they didn't. I am going to run the Cobalt XR2 front and rear this time around and the DS2500 on the street.

DanielB

IIRC, the SBG rear BBK swaps the rear calipers to RX8 which have larger pistons vs. stock. And aren't their rear BBK rotors about the same diameter as the URGE, just thicker? Assuming that's correct, then wouldn't this shift bias to the rear?

bgoetz

Hmm, I actually didn't realize they were a similar diameter, I may need to look into this.

DanielB

I believe the stock rear caliper piston area is 2.05 sq in and the RX8 is 2.25. So RX8 is about 10% larger. Given the URGE rotors are the same diameter as stock, this would shift brake bias to the rear vs. stock. With the SBG rotors and RX8 calipers, the rear bias would be even more - adding at least another 10%.

If you have a front BBK that was balanced with the SBG rear BBK, then I follow that you'd see a shift to the front using the URGE rotors. But if you have the stock front brakes, then even though you've shifted bias forward, you still have a greater rear brake bias vs stock.

I guess I should have asked up front what you're running for front brakes.

bgoetz

I have the SBG front AP kit. It undoubtedly shifted bias forward, the question is did it shift it too much forward. On the street under hard braking my fronts lock before the rears for sure. On the track it does feel a bit more balanced although it is difficult to tell as I used the DS2500 pads. That is why I think my best bet is to try the XR2 front and rear and see how that feels.