for all those running these

how have you found them especially for track use, any sign of warping, cracks, damage etc after hard use ? what is wear rate like ?

also, anyone knows who manufactures the rotors for stoptech or does stoptech have their own factory that produces the rotors ?

 

I've used them, on my heavily-tracked ITR as well as on my other heavily-tracked car. I use street-track pads (e.g. Hawk HP Plus), generally the most aggressive brake pads I can find that don't squeal on the street or need excessive warmup.

With the help of the technical white papers on the Stoptech website, I've come to the realization that problems with vibrations, that I used to think were due to rotors warping, are instead due to uneven deposits of brake pad compound on the surface of the rotors (although, left untreated, they can lead to actual warping). I now bed my pads any time I change brake pad compounds or rotors, and I no longer have problems with vibrations.

I replace front rotors when they crack. I've found that all rotors eventually crack with extensive track use - solid-faced, slotted, cross-drilled, they all eventually crack. The cracks start out looking like stress cracks all over the surface of the rotors. It's time to replace the rotors when the actual cracks reach one half inch long, which is also when you can feel the crack with the edge of your fingernail (don't try this when the rotors are hot!). Also note that the cracks get worse when the rotors are cold, and fill in when the rotors get hot on the track, so they're more noticeable on the street, back at the hotel the next morning, or when you first go out on the track at the start of the day.

I've found that one-piece rotors typically last me 600-1000 actual track miles. Two-piece rotors (the Stoptech aero rotors) last 1200-1800 actual track miles, so they are providing close to double the lifespan of the one-piece rotors. However, since Autozone rotors are so inexpensive - (they've gone up 50 percent in price in the past year or two, but they're still only USD37.99, which is about two UK pounds sterling, right? ) - I've been using those rather than the two-piece rotors, which are extremely expensive.

I have never had any problems with wear rate (thickness spec) on either car. My front rotors crack before they get too thin, and my rear rotors practically last forever. I think I replaced them after 10K+ actual track miles due to thickness; that's an awful lot of track events.

 

exactly the feedback i was looking for , thank you so much

the question of cost effectiveness is on my mind as you also mentioned

the lifespan of 1 set of the 2 piece rotors is about same as 2 sets of 1 piece which are much cheaper but 2 piece has the benefits of slightly reducing rotating mass and less chance to warp on track

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti444 &raquo;</TD></TR><TR><TD CLASS="quote">2 piece has the benefits of slightly reducing rotating mass and less chance to warp on track</TD></TR></TABLE>

The effect on performance of the difference in rotating mass is insignificant.

Neither type of rotors warps. Read the Stoptech technical white paper on "The 'Warped' Brake Disc and Other Myths of the Braking System". Summary: Rotors don't warp; to avoid vibrations, bed your brakes.

 

again, i very much apprciate your reply, incredibly informative , cleared a lot of things up for me

i think 1 piece rotors will be more than adequate for my car use now

looks like im better of just buying seperate pads for track use but this means i will have to go though bedding process each time i switch pads which is a bit of a pain and hard to do safely where i am but just 1 of those things that has to be done for the pleasures of driving

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vti444 &raquo;</TD></TR><TR><TD CLASS="quote">looks like im better of just buying seperate pads for track use but this means i will have to go though bedding process each time i switch pads which is a bit of a pain and hard to do safely where i am but just 1 of those things that has to be done for the pleasures of driving </TD></TR></TABLE>

Well, an option if you do that is to get a separate set of rotors for your track pads, to avoid bedding every time.

Or, you could get a somewhat aggressive street-track pad, like I'm doing.

 

i thought id typed in gettin spare rotors as well with race pads but realised i didnt

ive found the higher end fast road/track pads are just too much for daily driving, i borrowed friends car with hp+ on and initial bite was too extreme, screech bad when cold and man did they chew rotors when cold

think ill go for spare set of rotors and pads for track only