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Old 06-21-2013, 11:42 PM   #18
Dez
 
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I'm pretty sure it's around 2000 RPM at 80
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Old 06-22-2013, 12:31 AM   #19
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These numbers are for my '13 1LS M6 with 18" wheels. Change out the bold numbers for your own and recalculate.

The math...

KNOWNS
A = Vehicle Speed (in mph)
B = Wheel Radius (in inches) measured from the wheel center to the ground
C = Rear Differential Ratio (ie 3.27)
D = Transmission Gear Ratio (ie .84)

VEHICLE - Convert MPH to in/min
(80mi/1hr) x (5280ft/1mi) x (12in/1ft) x (1hr/60min) = 84,480 in/min

WHEEL - Convert radius to circumference
C = 2πr = (2) x (π) x (13.75in) = 86.39 in = 86.39 in/1 rev

WHEEL - Convert in/rev to RPM
(84,480in/1rev) x (1rev/86.39in) = 977.89 RPM (at the wheel)

RPMs - Work it backwards through the drivetrain
(Wheel RPM) x (Differential Ratio) x (Transmission Gear Ratio) = Engine RPM
(977.89) x (3.27) x (.84) = 2,686 RPM
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Last edited by snymat68; 06-22-2013 at 01:32 AM.
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Old 06-22-2013, 12:32 AM   #20
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Quote:
Originally Posted by littlecammi View Post
I'm not that old yet, but I don't expect to move very fast when I am that age.

Thanks everyone else
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Old 06-22-2013, 12:36 AM   #21
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Quote:
Originally Posted by snymat68 View Post
These numbers are for my '13 1LS M6 with 18" wheels. Change out the bold numbers for your own and recalculate.

The math...

KNOWNS
A = Vehicle Speed (in mph)
B = Wheel Radius (in inches) measured from the wheel center to the ground
C = Rear Differential Ratio (ie 3.27)
D = Transmission Gear Ratio (ie .84)

VEHICLE - Convert MPH to in/min
(80mi/1hr) x (5280ft/1mi) x (12in/1ft) x (1hr/60min) = 84,480 in/min

WHEEL - Convert radius to circumference
C = 2πr = (2) x (π) x (13.75in) = 86.39 in/rev

WHEEL - Convert in/rev to RPM
(84,480in/1rev) x (1rev/86.39in) = 977.89 RPM (at the wheel)

RPMs - Work it backwards through the drivetrain
(Wheel RPM) x (Differential Ratio) x (Transmission Gear Ratio) = Engine RPM
(977.89) x (3.27) x (.84) = 2,686 RPM
Wow, that's really useful! It reminds me of AP Physics though
Thanks
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Old 06-22-2013, 12:59 AM   #22
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Yeah, no prob. I also have a spreadsheet that I whipped up one day when I was bored that tells me the vehicle speed for any given combination of engine rpm and gear.
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Old 06-22-2013, 10:20 AM   #23
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Quote:
Originally Posted by Comrando View Post
If I was passing I wouldn't be in 6th.
Wow! What program is this, or did you make it completely yourself? Very neat

(Oh and I only said the passing thing so I wouldn't get flak from people for cruising at that speed, but I do )
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Old 06-22-2013, 11:12 AM   #24
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I think I am right in between 2-2.1k @ 80mph.
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Old 06-22-2013, 11:17 AM   #25
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I have a 2012 SS with an LS3.

At 80 in 6th it is turning 1800 RPM.
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Old 06-22-2013, 02:42 PM   #26
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What I don't understand is I thought the LS Camaros had a tall gear for fuel economy... I thought that taller gears would get lower RPMs when cruising on the freeway?

I tested to make sure - at 80mph I'm at 2300-2400 rpms.

So wouldn't that mean I have a shorter gear? I really thought an economy geared v6 would have lower RPMs at 80mph than the SS...?
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Old 06-22-2013, 03:02 PM   #27
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I think on the V6 the rpms are that high to compensate for the power compared to the SS. You have 2 less cylinders to feed @2300 rpms so it still gets better MPGs..if it could do it, it would get crazy MPGs @1800!!
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Old 06-22-2013, 03:07 PM   #28
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Yeah I guess so - when I was driving a Corvette 427 a month ago I was shocked when I shifted into 6th gear and took it to 80mph and saw I was sub 2000 rpms...
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Old 06-22-2013, 05:19 PM   #29
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Quote:
Originally Posted by Comrando View Post
It's the transmission gears that are lower in the V6.

Do you have one for the 2013 2LS? That has 2.73 gears
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Old 06-22-2013, 09:37 PM   #30
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Around 2K+, last time I was on I-10 in West Texas speed limit was 85mph. Numerous cars pulled over by DPS.
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