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Rotors....Slotted, Cross-drilled or stock?

 
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Carnut 280  



Joined: 28 Dec 2002
Posts: 101
Location: Denver, Colorado

PostPosted: Sun Jan 19, 2003 3:25 am    Post subject: Rotors....Slotted, Cross-drilled or stock? Reply with quote

Hi everybody. now that we have the 924 on the road again, we are contemplating a brake upgrade. since we just bought a new set of 15" phone dials, we are thinkin that Turbo brakes are outa the question. So, then we considered new rotors, and thought that it's a marvelous idea. so, here is our dilemma. are there rotors to fit in a 15" wheel in slotted or cross-drilled?

Also, I've heard that Cross-drilled aren't worth the money, as they have a tendancey to crack. I remember reading it on a thread on this forum, but I don't remember where.

So, of your recommendations, are Cross-driled, stock, or slotted best for a street/track combination? Thanks
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AFBCamaro  



Joined: 03 Nov 2002
Posts: 199
Location: Orlando, FL

PostPosted: Sun Jan 19, 2003 4:01 am    Post subject: Reply with quote

My vote is for slotted rotors. Thats what I what to put in someday!
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1982 Porsche 924 in mild restoration process.
1991 Chevy Camaro RS "Freigh Train"
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AznDrgn  



Joined: 03 Nov 2002
Posts: 1188
Location: Harrisonburg/Alexandria, Va

PostPosted: Sun Jan 19, 2003 4:06 am    Post subject: Reply with quote

There was a post about this a while back and it seems the concensus was for slotted. Crossdrilling reduced the friction area, didn't really help cooling much and supposedly was actually worse for braking.
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-'87 Jeep Cherokee 4.0L 6" of lift 33" Super Swampers

-'83 Callaway 944 2.5L turbo, 300HP, 1 of 42 ever made
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924RACR  



Joined: 29 Jul 2001
Posts: 8238
Location: Royal Oak, MI, USA

PostPosted: Sun Jan 19, 2003 4:14 am    Post subject: Reply with quote

Stock are fine, work well enough on my racecar. Never ran out of brakes. Just get some new pads, like Metal Masters. And put on some stainless braid hoses, flush and bleed w/ fresh fluid.
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'79 924 #77 ITB racecar
'82 931 Plat. Silver
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Paul  



Joined: 02 Nov 2002
Posts: 9414
Location: Southeast Wisconsin

PostPosted: Sun Jan 19, 2003 4:32 am    Post subject: Reply with quote

I vote for stock!
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-nick  



Joined: 16 Nov 2002
Posts: 2699
Location: Cambridge, MA

PostPosted: Sun Jan 19, 2003 5:15 am    Post subject: Reply with quote

hey everyone,
i think i'm going to check out slotted rotors when mine are up for replacing. a few months ago i had to squeeze on the brakes hard during a rainstorm on the highway and they took a second to dry up before they started clamping down. i think that sort of situation is the only reason to use slotted or cross drilled. it's enough of a reason for me to check them out. the brakes took long enough for me to wonder if they were going to clamp down at all.

-nick
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Vince Ponz  



Joined: 02 Nov 2002
Posts: 3581
Location: Florida

PostPosted: Sun Jan 19, 2003 10:06 am    Post subject: Reply with quote

I have slotted rotors on the turbo. I think they are very good and stock faster than it did. Now I am thinking that maybe I just needed new rotors and they may have been the same as the slotted. Who knows. I bought mine for 80 dollars which may or may not be a good deal for two.

The track car 77 924 always used stock rotors and drums and I never had a problem. According to Jim Pasha you should change rotors as often as once every two sets of pads. Measure the rotors before you trash them. The 5 bolt system from the 944 go in within the week or two.

Vince
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