So, since I started autocrossing last year, I've had these 90-91 Civic EX spindles and brakes on my SMF class CRX. I love the feel and stopping power, but I'm powered by NA SOHC so I'm trying to lose as much weight as the class will allow. I know the 10.3" brakes are a bit heavier and its unsprung and rotational mass. I guess my question is will I still have adequate stopping power if I go back to the OEM 9.5" brakes with good pads. I already use ATE fluid and SS braided lines, and can fairly easily lock up my Star Specs, but I'm looking to switching to R comps as I progress in driving skills and money, lol. I don't think I'l have fade issues since I'm usually a single driver car with usually only 4 or 5 times per run I'm hard on the brakes.

Is it worth the trade-off for the weight loss to ditch the larger brakes for the smaller, lighter brakes?

 

run the smallest brakes you can.

 

You'll be just fine. It's just an Autox. You could run 5", non-ventilated rotors and get the job done.

Ran stock rotors on an ITA CRX (9.5") in a 12 hour road race enduro... so yea, you're gonna be OK.

 

Hmm I thought so. I never really pushed my car before the swap, and never autocrossed it before I went to the 10.3"s either, but I figure with a good pad and properly bled fluid it would be ok.

 

putting 9.5" 2 pc rotor w/ 4 pot? Since you are in SMF already!

 

^Haha I wish, I'm on a pretty tight budget, the next step will be some R comps, probably pull-offs. I still have some stock spindles laying around I may toss back on soon. Had I gotten into autocross before I started building this motor, I would've went a different route with the engine, but hey, you play the cards dealt right?