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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 09-19-2006, 04:56 PM   #1 (permalink)
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Rotors

Well, what do you think, stock, drilled, or slotted? I'm just tossing this out there to see what people think of it. My rotors have been turned enough already from the previous owner that when the time comes to replace the pads(tons of wear left), I think I'll do front and rear rotors as well.
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Old 09-19-2006, 04:59 PM   #2 (permalink)
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I think my stock brakes work great. I would stick with a quality stock replacement. The only change I would make to the E30 brake system is the brake fluid on a regular basis (i think it's two years), Stainless Steel Brake lines, and of course some dustless pads.
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Old 09-19-2006, 06:17 PM   #3 (permalink)
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Yeh I'dput the money into a good brake fluid flush and new fluid, stainless hoses and good shoes.
Mintex ctech?
Pagid blue?
Dust is definetly an issue though.
Ive heard of low quality aftermarket non OEM discs causing vibrations due to imbalance.
The bavauto discs look good to me. Havent tried them yet.
I'd like to get slotted and drilled, get both cooling and deglazing properties.
My buddy still races his 2002 with stock discs, and some super metalic pads.
We ran ceramic race compound once back in the day LOL, great for the track (Willow Springs) once they warmed up, but no good for auto cross cause they dont grab when cold ie half of the timed lap.
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Old 09-19-2006, 09:30 PM   #4 (permalink)
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The rotors off of a supercharged 93 vw corrado are about 11 inches, they will take stock brakes but you have to space out your caliper bracket to make them fit. The added diameter really helps you stop better. If there was any demand I could reproduce these brackets. For a nominal fee of course B)

For my car, I'm having hats machined to fit modified 12 inch rotors so I can use a set of 4 piston calipers from a mitsubushi 3000gt vr4 twin turbo AWD then I'm going to install a slightly altered brake master cyl from a 750il.
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Old 09-20-2006, 10:36 AM   #5 (permalink)
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I have been looking at Brembo aftermarket drilled rotors. I can get all four for about $145US. Mind you that's Ebay, I would hope the seller is selling the real deal that they say they are.
Got my brakes flushed and bled on Monday and the old dot fluid was pretty gross, had good stuff put in. The pedal feels better, but I have one very minor warp in a rear rotor and I think that's holding the system back, along with mediocre pads. Being that they have already been machined, a good set of pads and rotors should be great. I have had ceramic pads suggested as the 'best way to go', but like Rfitz says, they need some time to warm up, don't they?
Starmavin, four pistons would kick ass, especially with a 12 inch rotor!
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Old 12-06-2006, 08:52 PM   #6 (permalink)
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i wanna get cross drilled rotors i pulled off my rear cailpers and pulled the pistons out and a jello like substance sludged it's way out (my friend never tried actually bleeding the rear Brakes) it was funny and REALLY scary that they actually woked(Frount Wasn't as bad) if there are and mispells it is because halfway through this post my monitor when crazy and blurred the screen and i can barly see the text
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Old 12-07-2006, 02:21 AM   #7 (permalink)
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Quote:
Originally Posted by Starmavin
The rotors off of a supercharged 93 vw corrado are about 11 inches, they will take stock brakes but you have to space out your caliper bracket to make them fit. The added diameter really helps you stop better. If there was any demand I could reproduce these brackets. For a nominal fee of course B)

For my car, I'm having hats machined to fit modified 12 inch rotors so I can use a set of 4 piston calipers from a mitsubushi 3000gt vr4 twin turbo AWD then I'm going to install a slightly altered brake master cyl from a 750il.
I've got a set of JFZ all aluminum 4 pistons with said custom brackets and with said corrado rotors on my Scirocco with a 25mm MC, does the job




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Old 12-13-2006, 12:15 AM   #8 (permalink)
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Don't throw your money away with cross drilled rotors they aren't going to add anything performance wise except empty your wallet more.
Slotted or even blanks are the way to go. As already stated, clean fluid new pads and they will stop the car as good as the cross drilled and they wont crack on you if you track the car.
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Old 12-13-2006, 05:34 PM   #9 (permalink)
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ok first of, i dont know your experiance with racing or whatnot but i have yet to see xdrilled rotors crack on anything less than 4000 lbs..

Second you WILL notice a difference with xdrilled pads in perforance in that you wont get insane amounts of brake fade and your pads will last longer...the slotted rotor is a "stronger" attempt at the exact same thing but with less results.

I have run both and am currently running brembo slotted rotors cause i got them for damn near free, otherwise i WOULD be running zimmermans...
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Old 12-13-2006, 05:56 PM   #10 (permalink)
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Do you do track days (HPDE's)? I have seen them hairline crack on Integras and Hondas before. You rarely see drilled rotors on a race car because the drilled rotors can't hold as much heat so really they overheat faster than a slotted or blank rotor. Less mass=less heat absorption.
If drilled rotors where that much better, you'd see them in every form of racing out there.
Even Porsche admitted to only using them for looks and rain dissipation.
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Old 12-13-2006, 06:08 PM   #11 (permalink)
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yes i have been in all forms of racing from carts to solo2 to HPDE and time trials since i was 12....not once have i ever cracked a set of xdrilled rotors.....ever.....
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Old 12-13-2006, 06:35 PM   #12 (permalink)
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That's great but if they were better don't you think you'd see them in just about every form of racing.
Did you not notice very few other were using them? It's not because they are that much more expensive.
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Old 12-13-2006, 06:39 PM   #13 (permalink)
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WHY Blank rotors are better than cross drilled and/or slotted

Heres a good read.
Yeah, it's a Honda site...
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Old 12-13-2006, 10:55 PM   #14 (permalink)
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It is fairly obvious to me that who ever wrote that is in college that mom and dad are paying for and needs to get his nose out of the books and actually get his hands dirty before making statements like that. Because if you actually read his write up you'll see that he contradicts himself badly throughout the whole thing..

In his "BIG BRAKE KIT" part he seemed to have skipped the chapter in his physics book that he refers to so much that covers torque and furculum. If you are so young that you can't remember records then you may be lost on this, take a record and have some on spin it on a pencil then take your index fingers and press from both sides inward closer to the center, then try that further out. This will explain big brake function. And why it works even though the pad size doesn't change.

Sounds to me who ever wrote that up has been educated beyond his ability to reason, and has NO racing experience.
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Old 12-14-2006, 12:23 PM   #15 (permalink)
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Quote:
Originally Posted by Starmavin
If you are so young that you can't remember records then you may be lost on this, take a record and have some on spin it on a pencil then take your index fingers and press from both sides inward closer to the center, then try that further out.
That's a great analogy, Starmavin. It's funny, I was jsut commenting to a co-worker that the Boney-M Christmas song on the radio at the time was played alot at my 'rents when I was a kid on 33 1/3's! They still have a really sweet old school jukebox(the real deal, not a modern replica that plays CD's) that plays 45's. Ah, vinyl...
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