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Originally Posted by shaolin_style
I have a question. On my EG I'm still rocking Drums in the rear. How much performance would I actually gain switching to discs in the rear when about 75% of your braking is done at the front??
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None. There is no difference in braking whatsoever by swapping drums to discs in the rear of a Civic - and testing has backed this up. The main benefits of discs are better heat dissipation, better friction compound selection, and ease of maintenance. Many also prefer them for appearance purposes.
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I mean for Auto-x. I think for street use its not worth it to upgrade to rear discs.
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Street driving actually requires more brake heat capacity than regional Solo autocrossing does. If you don't think it is worth it for the street, then it isn't worth it for autocrossing either.
Autocrossing has completely different brake requirements vs. track days. For autocross, the weight benefit of smaller brakes is typically more important, whereas for track days, the heat capacity offered by more massive brakes is typically more important.
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Originally Posted by Ragnarok043
well drums are more prone to locking than disc.
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Um, no. That's way too general of a statement to be accurate. I know the point you're getting at, but you've misunderstood it. This is not true.
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drums are also not only heavier but adds more to the rotational mass of the rear wheel than disc.
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No, you're wrong. The ubiquitous 4x100mm 9.5" solid rear disc setup with 7CLP13S calipers weighs at least 7lbs more
per side than standard Civic drums do. Thats a gain of 14+lbs of unsprung mass.