Opinions needed - comparison between 10-bolt, 12-bolt, and 9" on the dyno
03-05-2003, 05:21 PM
#21
Re: Opinions needed - comparison between 10-bolt, 12-bolt, and 9" on the dyno </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by LS1LT1:
<strong> And what about the actual weight of each?
We generally know that the 10 bolt weighs the least but is the 12 bolt 'always' lighter than the 9" or are there ways to outfit a 9" (aluminum casing etc.) to actually be lighter than the 12 bolt (or even lighter than the stock 10 bolt for that matter)? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That is where the 9" has the advantage. There are companies that make aluminum center sections and even aluminum housings. While the aluminum center "might" not hold up for drag racing in cars as heavy as ours, I am sure that these could be used in auto-x or road racing.
The big problem I have found with a 9" is the one that I hit, what to do on cars with 3 channel ABS? I have always been told that in order to keep ABS with a 9", you need 4 channel (which came with traction controle). What would be involved in converting over to a 4 channel system?
Chris
<strong> And what about the actual weight of each?
We generally know that the 10 bolt weighs the least but is the 12 bolt 'always' lighter than the 9" or are there ways to outfit a 9" (aluminum casing etc.) to actually be lighter than the 12 bolt (or even lighter than the stock 10 bolt for that matter)? </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That is where the 9" has the advantage. There are companies that make aluminum center sections and even aluminum housings. While the aluminum center "might" not hold up for drag racing in cars as heavy as ours, I am sure that these could be used in auto-x or road racing.
The big problem I have found with a 9" is the one that I hit, what to do on cars with 3 channel ABS? I have always been told that in order to keep ABS with a 9", you need 4 channel (which came with traction controle). What would be involved in converting over to a 4 channel system?
Chris
03-05-2003, 05:57 PM
#22
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Re: Opinions needed - comparison between 10-bolt, 12-bolt, and 9" on the dyno Dont forget to factor in the weight diffrence in the Yolks, axles, u-joints, and most of us Steel HD Driveshaft's. I would Expect possibly 8-10RWHP loss on a 33spline 12 bolt w/posi and HD Steel driveshaft. But this is 100% Guess.
03-05-2003, 06:41 PM
#23
Re: Opinions needed - comparison between 10-bolt, 12-bolt, and 9" on the dyno Here's my 9 inch setup and weight. Moser 9" housing with 31 spline axles w/ABS, Strange aluminum case, billet aluminum pinion support, billet aluminum 1350 yoke, Powertrax locker, 28 spline pinion, 3.89 gear. That combo weighs in at 178lbs. Don't remember what the 10bolt weighed. I can tell a fractional power loss, but the gears make up for that. I was at 430 rwhp last dyno with the 10 bolt. I'll be going back to the same dyno next week, and I'll note the difference. BTW - Good thread. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
