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PostPosted: Tue Mar 11, 2008 10:16 pm 
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Im going to need to change the standard 6cylinder diff in my HQ. Im going to be running approx 250kw through it.
Ive been told i could fit a salsbury or a 9inch.
I would like to do big skids and drag it etc.
Im thinking of purchasing a 330mm big brake kit off rare spares for the front, they told me they can do a kit for the rear aswell.

What i want to know is should i muck around with an old salsbury or should i get a 9inch built. What holds the power better ?
Any advice please.
Also has anyone purchased a big brake kit for an HQ


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PostPosted: Wed Mar 12, 2008 7:14 am 
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HDT
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9 inch is the only way to go if ya have 250rwkw and wanna do big skids.
Holden diffs last a short time.
Ive blown 30 odd diffs over the years ( like most here i presume :P)
Wish i had the money to do it right at the start.


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PostPosted: Wed Mar 12, 2008 10:43 am 
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Incoming Right Hook
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ofive wrote:
9 inch is the only way to go if ya have 250rwkw and wanna do big skids.
Holden diffs last a short time.
Ive blown 30 odd diffs over the years ( like most here i presume :P)
Wish i had the money to do it right at the start.



Why is that?? :?

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PostPosted: Wed Mar 12, 2008 11:26 am 
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Like most "standard" differentials, they are not designed for doing wheelies or drags. This type of activity puts an enormous amount of pressure on the componants in a very short space of time over a longer than usual period. They are designed for "normal" motoring. For any high performance activity, it is always better to get "stronger" parts that are designed for that purpose. Not a Holden specific issue either. Relates to all manufacturers.

Otherwise things go bang! :lol:

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PostPosted: Wed Mar 12, 2008 11:28 am 
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well that explains it in a nutshell.Cheers CrazyJeff

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PostPosted: Wed Mar 12, 2008 12:54 pm 
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HDT
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Exactly crazyjeff.

I run a 9 inch with Late model (well 1990 onwards) discs , was an easy and cheap option.
Rear discs was one of the best things i ever did.


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PostPosted: Wed Mar 12, 2008 8:27 pm 
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My HQ runs the factory V8 salisbury LSD (4 spider) which Steelie Gears rebuilt. I've raced with it, done 11.9s with NOS and it still hasn't shat itself. In 6 years of use and abuse it's been back to him twice for a tune up. Why get a 9" when ya dont HAVE to. Talk to Rat @ Steelie Gears, he the man when it comes to those diffs.

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PostPosted: Wed Mar 12, 2008 8:36 pm 
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HDT
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Steelie gears get my vote, they are the masters.


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PostPosted: Thu Mar 13, 2008 12:54 pm 
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Bad 23 T
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SexyQ wrote:
My HQ runs the factory V8 salisbury LSD (4 spider) which Steelie Gears rebuilt. I've raced with it, done 11.9s with NOS and it still hasn't shat itself. In 6 years of use and abuse it's been back to him twice for a tune up. Why get a 9" when ya dont HAVE to. Talk to Rat @ Steelie Gears, he the man when it comes to those diffs.



8) Tru there Q... some last most dont... depends on how much HP you plan on givin her, and how sticky you are ( Tyres that is lolol ) and how much weight u can get on that rear ( Tyres again there!! ).
Decent HP, good weight transfeer, sticky meats = strong diff.... 8)

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PostPosted: Tue Mar 18, 2008 6:48 pm 
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Hmmm well let me see now. HQ = big heavy car. Carl racing = fat head so more weight. NOS = 125 extra HP dumped into a 350 chevy. Tyres = ET Streets. Skids = big NOS powerskids EVERYTIME. Me finks me diff a goodie huh. Fanks rat, you da man 8)

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PostPosted: Mon Jun 16, 2008 10:38 pm 
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mate i run bbc +nos in hq monaro 1650kg run 9.7@141mph on stand hq brakes and holden 28 spline axels with 9" center not a worry :lol:


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