Rear Axle
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TECH Apprentice
Joined: Jan 2002
Posts: 313
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From: TEXAS
Rear Axle Ok I should probably start to be thinking about what to do with my rear axle since the car should be over 550 rwhp and I still have the stock 10 bolt in it (not sure how but its still alive).
Now since most of the aftermarket rear ends seem to be set up for drag cars, what about those of us that want to road race? I know for one that I am going to need to get tapered roller bearings, I would like to keep the ABS (3 channel) on the car...but what about a diff?
I don't know of any 9" that you can use ABS with (unless some body knows of one) so I guess I'm looking at a 12 bolt.
What are you guys running?
Now since most of the aftermarket rear ends seem to be set up for drag cars, what about those of us that want to road race? I know for one that I am going to need to get tapered roller bearings, I would like to keep the ABS (3 channel) on the car...but what about a diff?
I don't know of any 9" that you can use ABS with (unless some body knows of one) so I guess I'm looking at a 12 bolt.
What are you guys running?
TECH Fanatic
Joined: Nov 2001
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From: PURDUE
Re: Rear Axle There is no hope bud, you're screwed. <img src="gr_images/icons/wink.gif" border="0">
I've heard of several people running Strange 12bolts on the road course. They have better options for differentials and the likes.
Moser offers a 9" with ABS too.
What gears are you thinking?
I've heard of several people running Strange 12bolts on the road course. They have better options for differentials and the likes.
Moser offers a 9" with ABS too.
What gears are you thinking?
Re: Rear Axle I had no problems out of my stock 10 bolt in a road racing situation.
This was in a 355cid Z28 M6 w/ 530rwhp. I ran on BFG R1's for 2 hours at Road Atlanta. 4.10's, etc.
Are you more interested in road racing the car, drag racing, or just want a beefy rear that won't break?
This was in a 355cid Z28 M6 w/ 530rwhp. I ran on BFG R1's for 2 hours at Road Atlanta. 4.10's, etc.
Are you more interested in road racing the car, drag racing, or just want a beefy rear that won't break?
Thread Starter
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Joined: Jan 2002
Posts: 313
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From: TEXAS
Re: Rear Axle If the car ever goes to the drag strip it will be just for fun. The car is mainly going to be street/road course for the next few years til I get out of college then I'll tear it all apart again and set it up for the Silver State Classic...but thats a ways off.
I just kinda figured it would pop the rear end at some point. Maybe not....I'm not planning on changing it til it blows up I just kinda wanted an idea of what was out there if I have to get a new rear end in the car.
As far as what gears to put in? Hell if I know right now. The car has 4:10's in it right now
I just kinda figured it would pop the rear end at some point. Maybe not....I'm not planning on changing it til it blows up I just kinda wanted an idea of what was out there if I have to get a new rear end in the car.
As far as what gears to put in? Hell if I know right now. The car has 4:10's in it right now
Re: Rear Axle Anthony,
The thing to watch is the pinion. We ran a MAX of 3 road races on a R/P set. After that, it got all new parts. This was world challenge-'93/'94/'95, and we were not allowed to run anything else other than the stock 10 bolt. With out sticky tires you should have no problem, but you do need to keep an eye on it. we can talk about this more seriously if you are interested.
-Louis
The thing to watch is the pinion. We ran a MAX of 3 road races on a R/P set. After that, it got all new parts. This was world challenge-'93/'94/'95, and we were not allowed to run anything else other than the stock 10 bolt. With out sticky tires you should have no problem, but you do need to keep an eye on it. we can talk about this more seriously if you are interested.
-Louis
Re: Rear Axle Zexel makes a T-2R (race) Torsen for these car's. Might try that. I've got an Auburn on my 'Hawk. Was suppose to be stronger, it's not! Blew it up with only 6400 miles on the clock at the drag strip. I nomally autox and do open track events. Got a Zexel on my '94 and it's much more progressive felling than the Auburn. Plus i trust gears more than cone clutches anyday no matter what SLP says!
<img border="0" alt="[Pontiac]" title="" src="graemlins/formula.gif" />
<img border="0" alt="[Pontiac]" title="" src="graemlins/formula.gif" />
Thread Starter
TECH Apprentice
Joined: Jan 2002
Posts: 313
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From: TEXAS
Re: Rear Axle Thanks for all the ideas...keep em coming.
Yeah I would love to sit down and figure something out on this car Louis, that would be great. Oh, on a side note Louis, I just got the car on the ground tonight....front end is a tad on the low side, I think I'm going to have to play with the ride height a bit til I get it right.
Well about the stickest tire I plan on going with right now would be the 555 RR's if they come out with the 315's this summer..if not then I guess something like a VictoRacer or g-Force KD...something pretty stickey that I can still drive on the street for right now.
I'm pretty sure as long as I'm not banging gears with it, it should hold up but like I said I just kinda want a plan of attack just incase the rear end does decided to let go.
Yeah I would love to sit down and figure something out on this car Louis, that would be great. Oh, on a side note Louis, I just got the car on the ground tonight....front end is a tad on the low side, I think I'm going to have to play with the ride height a bit til I get it right.
Well about the stickest tire I plan on going with right now would be the 555 RR's if they come out with the 315's this summer..if not then I guess something like a VictoRacer or g-Force KD...something pretty stickey that I can still drive on the street for right now.
I'm pretty sure as long as I'm not banging gears with it, it should hold up but like I said I just kinda want a plan of attack just incase the rear end does decided to let go.
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Re: Rear Axle If you do decide to go with a 12bolt, stay away from the HD Eaton. If you try to accelerate coming out of a turn with it, it will kick the rear out pretty hard. My stock 10 bolt torsen was much more forgiving.
Mark
Mark
Re: Rear Axle Tires:
The Victoracers are great. That's what i run on my 'Hawk. G-forces suck and that's why i think they stopped making them. If you want something really sticky go for the Hoosiers, but life on the street is something like only 8,000 miles.
The Victoracers are great. That's what i run on my 'Hawk. G-forces suck and that's why i think they stopped making them. If you want something really sticky go for the Hoosiers, but life on the street is something like only 8,000 miles.
Launching!
Joined: Jan 2002
Posts: 275
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From: Bardonia, NY
Re: Rear Axle Back to the topic... How would you set up a 12 bolt if you wanted to keep the option of road racing open... I've heard that c-clip eliminators are illegal for SCCA events... but would a non-c-clip 12 bolt count as a c-clip eliminator since it isn't a c-clip elimanator being installed on a C-clip axle... but the use of ford outers on the 12 bolt which eliminates the need for the c-clips? If I do retain the C-clips, how much will that hurt the strength of my axle shafts? Instead of telling what diff sucks in a 12 bolt for road racing... which one works well? from what I hear the Eaton and the Auburn are actually pretty similiar in terms of performance, but the eaton's are stronger/cheaper and rebuildable... Any truth to this?
Thread Starter
TECH Apprentice
Joined: Jan 2002
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From: TEXAS
Re: Rear Axle Only thing I know that is different is that on the eliminators it just has a regular bearing on the axle and there is an axle plate that holds the axles in the car instead of the C-clips. Now if you start to pull a lot of g's on a corner you can pull the axle out of the rear end.
Moser said that on the RR rear ends that they build they still use the bolt in rear axles but they use a tappered roller bearing (similar to a front wheel bearing) on the axles to help with the side loading.
Moser said that on the RR rear ends that they build they still use the bolt in rear axles but they use a tappered roller bearing (similar to a front wheel bearing) on the axles to help with the side loading.
Re: Rear Axle </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by VINCE:
<strong>jhelms you have 4.10's for road racing? I thought that was too much gear for road racing and 3.73's would be better..</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It totally depends on the track and the power of the car. Where a short tight track with a lot of turns might require one gearset, another more open track with longer straights might suit your car better with different gears.
My 94Z28 with 530rwhp and R1's did pretty well at Road Atlanta with 4.10's, there was only one corner where 2nd gear was even an option (most of the time I left it in 3rd through this corner), the rest were 3rd gear at the lowest, and traction was almost there in 3rd. 3.73's probably would have been good for me as well in that situation but then the 'slow' corner would have needed 2nd for sure.
<strong>jhelms you have 4.10's for road racing? I thought that was too much gear for road racing and 3.73's would be better..</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It totally depends on the track and the power of the car. Where a short tight track with a lot of turns might require one gearset, another more open track with longer straights might suit your car better with different gears.
My 94Z28 with 530rwhp and R1's did pretty well at Road Atlanta with 4.10's, there was only one corner where 2nd gear was even an option (most of the time I left it in 3rd through this corner), the rest were 3rd gear at the lowest, and traction was almost there in 3rd. 3.73's probably would have been good for me as well in that situation but then the 'slow' corner would have needed 2nd for sure.