Electric 928 gets lighter brakes
09-01-2008, 09:43 PM
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Electric 928 gets lighter brakes
Hello Everyone,
I finally got the front brakes changed over.
http://www.flickr.com/photos/1394772...7607064969841/
Havent done the rears yet, the Willwood calipers I orderd wont work on the rear, going to have to exchange them for different model.
Lets see, the setup so far:
Had to cut off the of old caliper mount points and drilled and tapped the four debre sheild holes for larger thread size.
Changed the pedal ratio to increase the leverage. So far im using the stock master cylinder, since it is the same size as the one recommended to change the brakes to manual.
Seems to have plenty of stopping power with the power booster disconnected. Once I change over the battery pack in a few months I will remove the booster and install a new master cylinder. I dont feel like removing the entire front battery pack to get it out.
As you can see, I machined the early model front rotors into wave rotors. This got rid of another 1.5 lbs. and a total of 4.5 lbs. lighter than the lightened 84 rotors. You deffinatly feel a difference with this design and im not sure whether they will stay on the car.
The new calipers are 8.5 lbs. lighter each and the rotors are 4.5 lbs. lighter each. This is like removing 25lbs. out of the chasis for each front rotor alone.
Oh yes, I know im crazy
Jeff McCabe (the crazy electric guy)
I finally got the front brakes changed over.
http://www.flickr.com/photos/1394772...7607064969841/
Havent done the rears yet, the Willwood calipers I orderd wont work on the rear, going to have to exchange them for different model.
Lets see, the setup so far:
Had to cut off the of old caliper mount points and drilled and tapped the four debre sheild holes for larger thread size.
Changed the pedal ratio to increase the leverage. So far im using the stock master cylinder, since it is the same size as the one recommended to change the brakes to manual.
Seems to have plenty of stopping power with the power booster disconnected. Once I change over the battery pack in a few months I will remove the booster and install a new master cylinder. I dont feel like removing the entire front battery pack to get it out.
As you can see, I machined the early model front rotors into wave rotors. This got rid of another 1.5 lbs. and a total of 4.5 lbs. lighter than the lightened 84 rotors. You deffinatly feel a difference with this design and im not sure whether they will stay on the car.
The new calipers are 8.5 lbs. lighter each and the rotors are 4.5 lbs. lighter each. This is like removing 25lbs. out of the chasis for each front rotor alone.
Oh yes, I know im crazy
Jeff McCabe (the crazy electric guy)
Last edited by jmccabe; 09-01-2008 at 09:51 PM. Reason: spelling
09-01-2008, 09:48 PM
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Electric 928 gets lighter brakes
Sorry corrected the 928 !
Hello Everyone,
I finally got the front brakes changed over.
http://www.flickr.com/photos/1394772...7607064969841/
Havent done the rears yet, the Willwood calipers I orderd wont work on the rear, going to have to exchange them for different model.
Lets see, the setup so far:
Had to cut off the of old caliper mount points and drilled and tapped the four debre sheild holes for larger thread size.
Changed the pedal ratio to increase the leverage. So far im using the stock master cylinder, since it is the same size as the one recommended to change the brakes to manual.
Seems to have plenty of stopping power with the power booster disconnected. Once I change over the battery pack in a few months I will remove the booster and install a new master cylinder. I dont feel like removing the entire front battery pack to get it out.
As you can see, I machined the early model front rotors into wave rotors. This got rid of another 1.5 lbs. and a total of 4.5 lbs. lighter than the lightened 84 rotors. You deffinatly feel a difference with this design and im not sure whether they will stay on the car.
The new calipers are 8.5 lbs. lighter each and the rotors are 4.5 lbs. lighter each. This is like removing 25lbs. out of the chasis for each front rotor alone.
Oh yes, I know im crazy
Jeff McCabe (the crazy electric guy)
I finally got the front brakes changed over.
http://www.flickr.com/photos/1394772...7607064969841/
Havent done the rears yet, the Willwood calipers I orderd wont work on the rear, going to have to exchange them for different model.
Lets see, the setup so far:
Had to cut off the of old caliper mount points and drilled and tapped the four debre sheild holes for larger thread size.
Changed the pedal ratio to increase the leverage. So far im using the stock master cylinder, since it is the same size as the one recommended to change the brakes to manual.
Seems to have plenty of stopping power with the power booster disconnected. Once I change over the battery pack in a few months I will remove the booster and install a new master cylinder. I dont feel like removing the entire front battery pack to get it out.
As you can see, I machined the early model front rotors into wave rotors. This got rid of another 1.5 lbs. and a total of 4.5 lbs. lighter than the lightened 84 rotors. You deffinatly feel a difference with this design and im not sure whether they will stay on the car.
The new calipers are 8.5 lbs. lighter each and the rotors are 4.5 lbs. lighter each. This is like removing 25lbs. out of the chasis for each front rotor alone.
Oh yes, I know im crazy
Jeff McCabe (the crazy electric guy)
09-01-2008, 09:58 PM
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After about half dozen hard braking stops the wave rotors were about 25 degs. warmer than the unmodified ones. Still this was only 150deg. on a 90 deg. day.
Jeff.
09-02-2008, 12:30 AM
#5
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Not to mention all that weight removed is unsprung weight - which is always nice.
For the wave rotors, KTM has been using them for a while now, besides the small weight savings, they clear out the mud better then solid/slotted/drilled rotors. Not much of an issue with the 928.
And the waves on the dirt bike rotors seem smaller relative to the size of the rotor then the way you have yours cut, but I could be wrong from just eye-balling the photos.
For the wave rotors, KTM has been using them for a while now, besides the small weight savings, they clear out the mud better then solid/slotted/drilled rotors. Not much of an issue with the 928.
And the waves on the dirt bike rotors seem smaller relative to the size of the rotor then the way you have yours cut, but I could be wrong from just eye-balling the photos.
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09-02-2008, 01:11 AM
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09-02-2008, 03:47 PM
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09-02-2008, 09:43 PM
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09-02-2008, 10:41 PM
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