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Anyone Seen These Tii Rotors?


steve k.
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I recently upgraded my non-tii car with tii struts and used Ireland's vented, slotted, and cross drilled rotors. I got stymied by the need for wider calipers and balked at the $$$$$ spacers sold by Waloch & Nesht. I eventually recognized that a pair of core grade 5 series calipers I already had in the parts bin had the spacers in them. Split them open, cleaned them up and inserted them into a set of tii calipers with new O rings and they work great. No leaks evident past 10 months. My old brakes were down right scary so the improvement is amazing. Probably overkill for my non tracked, not even daily driver, but very confident stopping now.

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Those are 2002 Turbo rotors. The common "ventilated" big brake kit uses a 1977 e21 320i rotor and hub. The 320 rotor fits over the hub, the Turbo rotor bolts to the back of the hub (Turbo and Tii used the same hub) Yes the caliper to use with the 'big brake" kit is the e12 528 caliper (twin circuit, with spacer for ventilated caliper)

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On 5/23/2013 at 6:58 PM, Preyupy said:

Those are 2002 Turbo rotors. The common "ventilated" big brake kit uses a 1977 e21 320i rotor and hub. The 320 rotor fits over the hub, the Turbo rotor bolts to the back of the hub (Turbo and Tii used the same hub) Yes the caliper to use with the 'big brake" kit is the e12 528 caliper (twin circuit, with spacer for ventilated caliper)


Byron,

 

Am I correct to believe that these ventilated rotors necessitated the (factory) turbo's use of ET18 rims?

 

Regards,

 

Steve

Edited by Conserv
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The spacer in the caliper moved the outer half of the caliper out I believe 10mm and that would have caused a problem with clearance to the back side of the spokes on the wheel. That could have been taken care of without changing the offset, they just needed to change the shape of the back side of the spoke. They were able to change the offset because of the fender flares and widen the stance.

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On 5/23/2013 at 8:09 PM, Preyupy said:

The spacer in the caliper moved the outer half of the caliper out I believe 10mm and that would have caused a problem with clearance to the back side of the spokes on the wheel. That could have been taken care of without changing the offset, they just needed to change the shape of the back side of the spoke. They were able to change the offset because of the fender flares and widen the stance.


Got it! It may have been cheaper and/or easier to change the ET on the styled steel rims than to change their design.

 

Amazingly, the e21 cars, which were in the design process just as the turbo was being produced (actual European e21 production began May '75), adopted the same styled steel rim with an ET of 18. And were generally shod with 185/70 rubber.

 

Maybe they liked what they saw on the turbo!

 

Thanks,

 

Steve

 

Edited by Conserv
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Those are 2002 Turbo rotors. The common "ventilated" big brake kit uses a 1977 e21 320i rotor and hub. The 320 rotor fits over the hub, the Turbo rotor bolts to the back of the hub (Turbo and Tii used the same hub) Yes the caliper to use with the 'big brake" kit is the e12 528 caliper (twin circuit, with spacer for ventilated caliper)

Those are Alpina rotors. The Turbo rotors are 22mm and the Alpina's are 20mm. The 528 calipers will be too wide for the Alpina rotors, hence the spacer kit.

Edited by Mike_B
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