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Old 10-13-2006, 02:55 PM   #1
e36 323ti
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Default Vented rear disk on an e36 compact?

Is there anyone who has done a conversion from solid to vented rear disks on their ti's?

Direct link to my final solution:http://www.318ti.org/forum/showpost....&postcount=247

Last edited by e36 323ti; 08-14-2011 at 01:18 PM. Reason: Added link to my final solution!
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Old 10-13-2006, 04:00 PM   #2
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Interesting idea, what needs to be changed, besides the rotors?

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Originally Posted by e36 323ti View Post
Is there anyone who has done a convertion from solid to vented rear disks on their ti's?
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Old 10-13-2006, 04:09 PM   #3
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i have vented on my rears and solid on the front... did previous years come with all solids???

i know for a front solid to vented, you need to change the calipers, get pads for those calipers and stronger brake lines(i think) and then it should all work...
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Old 10-13-2006, 04:19 PM   #4
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Are you sure about having vented rear brakes? I have a 1998 with vented front brakes, but never heard of stock vented rear brakes. The rear rotor is actually a hub rotor in one. The hydraulic brake uses the rotor portion, the parking brake uses shoes in the hub.

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Originally Posted by rwd_king View Post
i have vented on my rears and solid on the front... did previous years come with all solids???

i know for a front solid to vented, you need to change the calipers, get pads for those calipers and stronger brake lines(i think) and then it should all work...
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OEM Armrest • Blaupunkt Heidelberg CD50 CD Player/Compact Drive MP3 Player • Diamond Audio 5.25" rear speakers • Navman ICN 530 GPS • BMWALARM.COM (with comfort settings) after market alarm system • Magnecor 8.5mm wires • M-Z3 Shifter/Momo Knob • Burlwood Dashboard • Stromung Exhaust • X-brace • Racing Dynamics Front Strut Bar • Carbonio C.A.I. • 17" Rial Rims • Vader Seats/Heated/Lumbar Support • M-tech Steering Wheel/Front Sway Bar/Front & Rear Bumper • Depos/w 6500K Angel Eyes/6000K HIDs • Clear Corners • M3 Mirrors • UUC Light Weight Flywheel/M5 Clutch/M3 Clutch Slave • E28 3.46 LSD/Mcoupe Cover/E30 Flanges & Halfshafts • UUC S.S. Brake/Clutch Lines • Hartge Roof Spoiler • BavAuto Springs• Bilstein Sport Struts/Shocks • E46 M3 Rear Shock Mounts • SPC Front Camber Kit • Reiger Hatch Spoiler • BavAuto Rear Camber Kit • Dinan Stage II Software • Turner Rear Sway Bar Reinforcements • BMW E46 Auto dimming mirror with Clown Nose alarm • Engine Compartment Light • Heated Wiper Fluid Retrofit • OEM Fire Extinguisher • Da'lan Trailer Hitch • Rear Sun Shade • OEM Fog Light Retrofit • H & R MZ3 Rear Sway Bar/ UUC Adjustable End Links • Cruise Control Retrofit • On Board Computer Retrofit • M3 twistie style side skirts • Carbon Fiber Hood
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Old 10-13-2006, 04:50 PM   #5
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nope, your absolutely right..
i don't know why i thought i had vented rears
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Old 10-13-2006, 05:20 PM   #6
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I think you have to get the complete subframe from a z3 to upgrade the rear brakes without going aftermarket. There are other threads around from people who have done it.
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Old 10-13-2006, 07:09 PM   #7
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Based on temperature and wear I don'think vented rears will buy much. I work on a lot of race cars and vented rear brakes are uncommon until your either over 155mph or your car weighs over 3500 lbs.

Spec miata for example uses Hawk BLue pads front and Hawk Blacks in the rear because the blue don't get hot enough to work in the back.

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Old 10-13-2006, 07:18 PM   #8
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Just doing a quick check of parts diagrams at realoem.com shows that all the E36 models have non-vented rear rotors. Even the M cars. You could probably find a custom set-up on the aftermarket, but I really don't think it's worth that kind of money. See the reasons given in the previous posts.
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Old 10-13-2006, 07:42 PM   #9
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Quote:
Originally Posted by mohaughn View Post
I think you have to get the complete subframe from a z3 to upgrade the rear brakes without going aftermarket. There are other threads around from people who have done it.
I have search alot, but has not succeed in finding anything.

What I plan to do is to use vented disks from the e36 328i/323i (276x19mm), callippers from the e36 328i drop-top (because it has 38mm pistons). The reason why is that I plan to use AP-Racing 4-pot callipers with 330mm disks up front. To maintain near stock like brake-bias the stuff from the drop-top is required (at least according to my calculations).

Please excuse my bad english
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Old 10-13-2006, 07:49 PM   #10
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Your calculations may be off, the proportioning valve on the stock system reduces rear braking substantially. I think I read 80%. Of course,, for track use,, you may need the extra cooling, be sure and let us know the result...
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Old 10-13-2006, 08:03 PM   #11
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http://www.318ti.org/forum/showthread.php?t=9129

I have the 325mm BMW floating motorsport rotors from the e46-M up front with wilwood forged superlite calipers. On the rear I am running hawk hps street pads. I have no problems with brake bias. I've used the car at two track day events and several auto-x events. At Sebring I had one of the instructors drive the car and he even commented that he thought the braking abilities of the car were excellent. That is with the stock rear calipers and rotors.

UUC has their stage 3 brake kit, I have the stage 2, that includes front and rear wilwood calipers and the appropriate hangers and rotors. Althogh, if you are just going with a 330mm front brake kit the rears should be fine with a better brake pad.
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Old 10-13-2006, 08:04 PM   #12
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Quote:
Originally Posted by pdxmotorhead View Post
Your calculations may be off, the proportioning valve on the stock system reduces rear braking substantially. I think I read 80%. Of course,, for track use,, you may need the extra cooling, be sure and let us know the result...
To my knowledge there is no proportioning valve on my 323ti (I could not find it in the 'ETK')

.. and yes, it is beacuse of track use I am looking for more stopping power (or more correctly ways to handle the temperature). The rear pads (Ferodo DS2500) got fried on my last track day event, and delaminated. Also my front pads (DS2500) went away.

My calculations show that my 323ti has a stock bias setup by 72.6% (static). By going for the AP's with stock rear the bias goes up to 77%, which I think is too much. With AP up front and the proposed vented disks rear, my calculations reads 72.3% (very close to stock bias).

My 'ti: http://home.online.no/~krimp/sweb/photo_e36_323ti.htm
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Old 10-13-2006, 08:15 PM   #13
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Quote:
Originally Posted by bullmand View Post
Just doing a quick check of parts diagrams at realoem.com shows that all the E36 models have non-vented rear rotors. Even the M cars. You could probably find a custom set-up on the aftermarket, but I really don't think it's worth that kind of money. See the reasons given in the previous posts.
That's dependent on year of make. There was a change in 1996(?) when they went from 280x10mm solid to 276x19mm vented.
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Old 10-13-2006, 08:39 PM   #14
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I didn't realize you were in Europe. I was looking at the diagrams for the US models. Maybe you guys got vented rears and we didn't? For the record, I checked a 1998 323i and 1998 M roadster. If the rears on the M roadster are vented, there's info somewhere else on here about swapping the rear suspension from those onto the ti. Good luck.
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Old 10-13-2006, 09:24 PM   #15
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Quote:
Originally Posted by e36 323ti View Post
To my knowledge there is no proportioning valve on my 323ti (I could not find it in the 'ETK')

.. and yes, it is beacuse of track use I am looking for more stopping power (or more correctly ways to handle the temperature). The rear pads (Ferodo DS2500) got fried on my last track day event, and delaminated. Also my front pads (DS2500) went away.

My calculations show that my 323ti has a stock bias setup by 72.6% (static). By going for the AP's with stock rear the bias goes up to 77%, which I think is too much. With AP up front and the proposed vented disks rear, my calculations reads 72.3% (very close to stock bias).

My 'ti: http://home.online.no/~krimp/sweb/photo_e36_323ti.htm
I believe its integrated into the ABS pump housing. But I work on enough different marques that I could have it crossed up.... Still like to hear how your works, its good to get real data from trying things whether they work or not... And if it didn't work its cool to figure out what happened

Dave
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