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Old 01-12-2009, 02:39 PM   #1
TheMadHatter99
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Differential Question

I'm working on a project for my Physics of Motorsports class (coolest class EVAR) where I will calculate the theoretical/ideal 0-60 and 1/4 mile times for the Camaro. I've got practically all of the other numbers I need, but does anyone know the gear ratio for the rear differential?

Thanks in advance, and once I have my results I'll be sure to post it all up here.
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Old 01-12-2009, 02:41 PM   #2
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3.27 for all models, except: 3.45 for Manual SS.

Let us know how it all turns out, it ought to be cool!
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Old 01-12-2009, 02:43 PM   #3
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if you wanna make it look better, we're supposed to get a 3.73 option in 2011.
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Old 01-12-2009, 02:44 PM   #4
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Isn't 3.45 the transmission ratio? The differential should have its own, or are they the same?
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Old 01-12-2009, 02:58 PM   #5
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The transmission has 6 different ratios...I'm not sure what you mean about that...

The numbers I provided are for just the differentials, and the number zebra provided was a future differential option.
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Old 01-12-2009, 03:08 PM   #6
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Dragon gave you good numbers. How accurate do you need to be? weight? trans gearing? tire patch & size/diameter/width? HP/torque? Need these numbers also.
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Old 01-12-2009, 03:12 PM   #7
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Yeah, we're using mass, tire radius, gear ratios (preferably the trans and rear diff ratios, to be most accurate) and then I'm going to use the G8 GXP HP/Torque curve chart since that's the closest we've got (same engine and same basic chassis).

I have everything but the rear diff ratio and don't really know where to find that, hence the thread.

Any suggestions?
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Old 01-12-2009, 03:19 PM   #8
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This is everything you should ever need in terms of gear ratios.

PAGE 3:
http://www.chevrolet.com/camaro/pdf/...ifications.pdf
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Old 01-12-2009, 03:45 PM   #9
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^^ thanks! i never could remember where i saw that
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Old 01-12-2009, 04:54 PM   #10
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Thanks a lot Dragon, I'll flip through it and see if I can find what my prof was talking about.
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Old 01-13-2009, 01:08 PM   #11
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Quote:
Originally Posted by TheMadHatter99 View Post
I'm working on a project for my Physics of Motorsports class (coolest class EVAR) where I will calculate the theoretical/ideal 0-60 and 1/4 mile times for the Camaro. I've got practically all of the other numbers I need, but does anyone know the gear ratio for the rear differential?

Thanks in advance, and once I have my results I'll be sure to post it all up here.
Try this site...
http://home.att.net/~numericana/answ...mula.htm#0to60
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Old 01-13-2009, 04:41 PM   #12
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I got bored today at work; see if this helps at all...

**edit-> as noted below this is with 17" tires (someone was asking me about them). See a few posts down for the 20" spreadsheet.


Last edited by trm0002; 01-14-2009 at 12:13 PM.
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Old 01-13-2009, 05:08 PM   #13
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Anyone know what the diameter of the ring gear will be?
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Old 01-14-2009, 07:20 AM   #14
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I got bored today at work; see if this helps at all...

I think it's cool you took the time, but I think the rear wheel / tire diameter is 28.66" not 25.66".
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Old 01-14-2009, 09:46 AM   #15
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I think it's cool you took the time, but I think the rear wheel / tire diameter is 28.66" not 25.66".
Aw damn. Someone else was asking me questions about 17" tires- don't ask why- and I didn't change it back as you can see. The "text" is 245/45/20 but the fill in's are 245 45 17; same with the rear. Here it is again with 20's.....

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Old 01-14-2009, 10:33 AM   #16
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"Torque Limited Balls Out RPM"



& it's nice to know if i gotta back away from a serial killer, i can do it quickly!
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Old 01-14-2009, 04:59 PM   #17
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Originally Posted by 99b4c View Post
Anyone know what the diameter of the ring gear will be?
Can't even find the MFG, much less internals spec's...I think it's a ZF if the G8 boys are correct.
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