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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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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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Old 01-14-2009, 09:40 PM   #18
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Hmm...to hold on to 3rd and bump off the rev limiter for ET or shift to 4th in the quarter for speed.
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Old 01-15-2009, 10:17 PM   #19
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ET is always more important.


The 3.45 Gear ratio (M6) is the final drive ratio, or rear diff ratio. I'm fairly sure that's correct.
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Old 01-15-2009, 10:47 PM   #20
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The 3.45 Gear ratio (M6) is the final drive ratio, or rear diff ratio. I'm fairly sure that's correct.

Awesome, that's what I thought but needed the confirmation.

I'll be making an excel spreadsheet and posting it on here when I'm done so everyone can change the info to fit whatever car they'd like.

I'll also post a graph of the Camaro SS' shift times so we can tell exactly what RPM's would be most ideal.
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Old 01-16-2009, 09:03 AM   #21
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Quote:
Originally Posted by TheMadHatter99 View Post
Awesome, that's what I thought but needed the confirmation.

I'll be making an excel spreadsheet and posting it on here when I'm done so everyone can change the info to fit whatever car they'd like.

I'll also post a graph of the Camaro SS' shift times so we can tell exactly what RPM's would be most ideal.
I'll send you the above spreadsheet if you want as a starting point- excel is cross-platform...PM me.
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Old 01-16-2009, 09:38 AM   #22
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Don't do his homework for him now
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Old 01-16-2009, 09:41 AM   #23
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Don't do his homework for him now
Why not? All I want is his spot in line.
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Old 01-16-2009, 10:05 AM   #24
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I'll send you the above spreadsheet if you want as a starting point- excel is cross-platform...PM me.
Thanks, but the Academy is pretty paranoid about anything that could be construed as cheating so its probably safer that I decline.

Besides, this is the only homework over the last 4 years that I'll actually enjoy doing, haha.
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Old 01-23-2009, 06:12 PM   #25
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I'll also post a graph of the Camaro SS' shift times so we can tell exactly what RPM's would be most ideal.
Thanks, but I prefer to find my own sweet spot.
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