NoPistons -Mazda Rx7 & Rx8 Rotary Forum

Quote:

Originally Posted by jimlab1' date='May 21 2004, 10:50 PM

Actually, despite a significant increase in the size and strength of the parts involved, the aluminum '03+ Cobra 8.8" IRS differential assembly is about 7 pounds lighter than the cast iron original.

And, while you're on a roll, most people don't want one for drag racing. They want one to retain the handling the car came with while improving strength, decreasing weight a little, and getting a wide range of gear ratios in the bargain.

FD 36 lb. cast iron housing on the left, Cobra 14 lb. aluminum housing on the right.

http://www.rx7club.com/forum/attachment.ph...&postid=1380794

Cobra 8.8" ring and pinion on the left, FD 8.0" (203mm) ring and pinion on the right.

http://www.rx7club.com/forum/attachment.ph...&postid=1391549

FD Torsen on the left, Cobra 8.8" Zexel Torsen on the right.

http://www.rx7club.com/forum/attachment.ph...&postid=1423200

FD on the bottom, Cobra 8.8" on top.

http://www.rx7club.com/forum/attachment.ph...&postid=1423203

Cobra 8.8" differential, cradle, and FD rear subframe.

http://www.rx7club.com/attachment.php?s=&postid=2585932

And one more...

http://www.rx7club.com/attachment.php?s=&postid=2585938

Any questions?

FYI Jim, you can't cross link pix between the forums. Luckily posting images here at nopistons doesn't take 30 min like some places. You can attach them directly to your post if you want us to see them.