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06-12-2006, 07:33 AM
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#1
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Join Date: Apr 2005
Location: Somerset County, NJ
Posts: 447
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The age old question, 12 bolt or 9 inch rear?
I am looking to get a new rear for my 98 z28. I am beefing up the power a lot. Looking to run low 10's or possibly high 9's. But i am still keeping it a street use car. I mean i would use it at the drag strip once in a blue moon, but mostly on the street at a lower boost mind you. But would a 12 bolt suit my needs more if i am looking to make it more of a street car? I mean i don't want something to break if i take it the track the few times i may be running it. Also, what is the draw back with not having ABS? And also, since i am keeping it more of a street car, what gears would you guys recommend for street use? I mean more than likely i am not going to be good at launches, but then i do want to sacrifice too much gas either. 4.10s seems like a bad idea if i ever decide to drive long distances. But if i ever race some one on the street, i don't want to be peeling out instead of beating the guy either. I do have BF Drag radials on the rear. And lastly, based on what i wrote, what kind of setup for the rear would you guys suggest? I hear detroit locker, posi, spool. I am not sure what those even do.
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06-12-2006, 08:53 AM
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#2
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I will beat you with a toaster!
Join Date: Sep 2004
Posts: 6,054
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I dont think your goals are logical. You wanna go 9's and drive it on the street at a lower boost, okay with that given youre gonna need quite a gear to go into that kind of time unless you are making ALOT more power. If you are thinking of running 9's and are worried about gas mileage I think you need to sit down and learn what it takes go go that kind of time. Sounds to me like you need two cars. One to run to race and one to drive around on the street and get decent mileage.
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06-12-2006, 12:27 PM
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#3
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Banned Camp Director Emeritus
Join Date: Aug 2004
Location: Somerset County
Posts: 8,395
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a 12 bolt or a 9 inch will be fine. I personally would go for a strange S-60, but thats just me.
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Quote:
Originally Posted by baddest434
and 1 more smart ass answer by you and i'm going to reach into this monitor and grab you by the throat
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06-12-2006, 12:55 PM
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#4
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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I would say 9" or Dana 60....
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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06-12-2006, 01:51 PM
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#5
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13 Second Club
Join Date: Aug 2004
Location: Clifton,NJ/ Providence,RI
Posts: 520
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another vote for a 9in...you could even have 2 third members...one with street gears and a locker/posi with 3.23's or 3.55's then real steep gears with a spool for the track-4.56's or something...and just swap them out...
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06-12-2006, 04:26 PM
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#6
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.
Join Date: Feb 2006
Posts: 1,385
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Quote:
Originally Posted by 84HOtransam
another vote for a 9in...you could even have 2 third members...one with street gears and a locker/posi with 3.23's or 3.55's then real steep gears with a spool for the track-4.56's or something...and just swap them out...
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we have a 32 inch in diam tire and 4 56 gears in a 12 bolt 2 spped glide and shifting at 6800 going through traps at 7000 car goes in hot weather 9 40s 141 mph think about using one of the richmond gear charts to plot your gearing and a 9 does give you a quick change deal my 2 cents jz
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06-12-2006, 07:24 PM
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#7
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Join Date: Apr 2005
Location: Somerset County, NJ
Posts: 447
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Okay, the dana 60 intrigues me. I thought i saw some one post that you can have 3 or 4 channel ABS on the Dana. is that right? Also, i assume its meant to be a strong rear, or else you wouldn't have mentioned it. I am familiar with some cars that run good times and still get decent gas mileage though. I am not expecting to get 20 miles to the gallon here, but i am not expecting to get 8 either. I mean if you turn the boost down and keep it at a reasonable level, i would think that plays some influence on the fuel economy.
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06-13-2006, 12:37 PM
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#8
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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Well, will a turbo, you can have the boost set at 20 psi, and as long as you drive around town with a light foot, you prolly won't ever see boost. Turbos spool when there is a load on the engine. A turbo car at cruise speeds acts like an N/A car most of the time.
There is more to it than that - but that's the general idea.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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06-14-2006, 08:58 PM
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#9
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Join Date: Mar 2006
Location: Texan in Mt. Laurel
Posts: 167
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I am happy with my 12 bolt, but if I had it to do over again I would go with a Billingsley 9 inch custom housing with an aluminum center section over anything else.
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'99 TA, M6, 427, 12 bolt
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06-19-2006, 10:10 PM
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#10
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I will beat you with a toaster!
Join Date: Sep 2004
Posts: 6,054
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yeah but how much do one of those run?
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06-20-2006, 11:26 AM
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#11
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Join Date: Jan 2006
Location: Old Bridge
Posts: 133
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Quote:
Originally Posted by bad64chevelle
I dont think your goals are logical. You wanna go 9's and drive it on the street at a lower boost, okay with that given youre gonna need quite a gear to go into that kind of time unless you are making ALOT more power. If you are thinking of running 9's and are worried about gas mileage I think you need to sit down and learn what it takes go go that kind of time. Sounds to me like you need two cars. One to run to race and one to drive around on the street and get decent mileage.
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http://www.ls1speed.com/shopcar.cfm
Or this one (not an ls1 car same concept my friends old car)
http://www.eiptuning.com/eip/videogt...dpasslarge.mpg
first FWD VW into the 10's getting 22 mpg
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My buddy rob:
"fords are always breaking thats why I have a chevy to tow it"
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06-20-2006, 01:21 PM
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#12
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Co-Founder / Site Admin
Join Date: Jul 2004
Location: Ewing, NJ
Posts: 22,473
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LS1Speed's car is nice, but still only has two of the three requirements. With that motor and no OD (even with the 3.42 rear), I'm betting the milage sucks. Which is fine with me. I don't associate F-bodies with mileage, never will....but that is one of the things that redbandit seems to want.
- Justin
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1999 Camry - Beigemobile DD
2002 Suburban - Wife's DD
2004 Grand Cherokee - Not running / Project / Selling?
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06-20-2006, 03:11 PM
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#13
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NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
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12bolts are jsut as strong as 9inch rears. 12bolts also have less internal resistance, leaving more power reaching the wheels
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06-24-2006, 03:28 PM
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#14
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Join Date: Jan 2006
Location: Hamilton SQ
Posts: 103
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I have a 12 bolt for a reason! they use less power then a 9" rear. in the quest to go fast, why handicap your car with something that requires more power to turn if you dont absolutely need it.
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07-10-2006, 10:21 AM
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#15
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Join Date: Jan 2005
Location: easton,pa
Posts: 535
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I know someone that had a 9" in a 88' camaro that ran 9.30's n/a, and he switched to a moser 12 bolt, and did nothing else to the car, it gained 17hp on a chassis dyno,plus it now goes 9.26. plus i think the 12 bolt is about 20lbs lighter. JR1.
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07-10-2006, 10:40 AM
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#16
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Join Date: Jun 2006
Location: Morristown
Posts: 191
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Keep it GM. Go with the 12 Bolt.
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07-10-2006, 02:55 PM
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#17
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Keyboard Tough Guy
Join Date: Jul 2004
Location: Trenton, NJ
Posts: 6,341
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dana 60 FTW!!
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07-11-2006, 06:44 PM
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#18
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Join Date: Apr 2006
Location: Montville
Posts: 110
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Strange 12 bolt, or S60.
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Nick
97 Camaro SS, M6, Artic White, t top.
396, AFR 210's, single plane, Strange 12 bolt.
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07-12-2006, 02:44 PM
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#19
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Join Date: Jan 2005
Location: browns mills
Posts: 339
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**** it through a 14 bolt with 4.56 gears and say **** the gas milage and beat the balls out of it and hope the motor dont go hahaha i dunno but good luck with it
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94 z28 bbk headers chip shift kit k an n cold air
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07-12-2006, 07:43 PM
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#20
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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12 bolt with 9" housing ends.
Forget the Dana. Way too heavy and in almost all cases it's overkill.
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07-17-2006, 02:39 PM
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#21
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Keyboard Tough Guy
Join Date: Jul 2004
Location: Trenton, NJ
Posts: 6,341
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Quote:
Originally Posted by WildBillyT
12 bolt with 9" housing ends.
Forget the Dana. Way too heavy and in almost all cases it's overkill.
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a dana 60 for running 9's is overkill?
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07-17-2006, 03:10 PM
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#22
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Join Date: Jul 2006
Location: Bernville, PA
Posts: 47
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I have a Moser 12 bolt with 4 11 gears. I don't have boost but I use the juice. My old best was a 10.46 (shooting for 9's in August). I drive the car on the street and the only thing I don't like about the 12-bolt is the whining so I just turn up the stereo.
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07-17-2006, 05:25 PM
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#23
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10 Second Club; Has fan club
Join Date: Dec 2005
Location: Delmont nj
Posts: 4,369
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Quote:
Originally Posted by BMF
I have a 12 bolt for a reason! they use less power then a 9" rear. in the quest to go fast, why handicap your car with something that requires more power to turn if you dont absolutely need it.
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i agree. im going that route this fall!
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01' Z06 62k miles. Vararam, Longtubes, off road xpipe, tuned by me. Times TBA
2001 Corvette, Bolt ons , tuned 10.75@124.56 mph 1.38 60' Sold
1997 Saturn Sc1 5spd DOHC swapped
Bolt ons, decked head, stock intake cam on exhaust side, lotsa weight redux
13.22@102.32 mph 1.93 60'
12's on moda? One day
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07-17-2006, 07:32 PM
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#24
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by foff667
a dana 60 for running 9's is overkill?
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In my opinion, yes. You can run 9's safely on a 12 bolt or 9" rear with no problems at all, tons of guys do it. Guys in the NMCA run 8's on the 8.5" 10 bolt (most notably Kurt Urban last time I saw). The Dana 60 is very heavy and has a lot of rotating mass (9 3/4" ring gear IIRC). Good for offroading but not drag racing.
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07-18-2006, 02:58 PM
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#25
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Join Date: Jan 2005
Location: easton,pa
Posts: 535
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Quote:
Originally Posted by WildBillyT
In my opinion, yes. You can run 9's safely on a 12 bolt or 9" rear with no problems at all, tons of guys do it. Guys in the NMCA run 8's on the 8.5" 10 bolt (most notably Kurt Urban last time I saw). The Dana 60 is very heavy and has a lot of rotating mass (9 3/4" ring gear IIRC). Good for offroading but not drag racing.
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Your right, kurt did run a 8.5" 10 bolt, but the rear end internals is what makes the rear strong not the housing. JR1.
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