RPMs different? 07 TO 13
08-13-2015, 10:02 PM
#1
Intermediate
Thread Starter
Member Since: Oct 2011
Location: Grand Ledge Mi
Posts: 25
Likes: 0
Received 0 Likes
on
0 Posts
RPMs different? 07 TO 13
I just traded in my 07 stick for a 13 stick I noticed rpms are higher. I know that I went from 6.0 to 6.2 liter but tire height is the same so I'm wondering if the rear end is a taller gear.
08-19-2015, 02:05 PM
#4
Race Director
Member Since: Mar 2010
Location: T-Town WA
Posts: 15,084
Received 3,601 Likes
on
2,334 Posts
2016 C6 of Year Finalist
08-19-2015, 02:18 PM
#5
Race Director
Member Since: Mar 2010
Location: T-Town WA
Posts: 15,084
Received 3,601 Likes
on
2,334 Posts
2016 C6 of Year Finalist
I could be wrong, but I believe the r/e ratio is the same for both....3.42. I suspect your '07 was a base and the '13 is a GS. The difference is in the 6th gear ratio (per ChevyDave's post): .50 in the base '07 to .57 in the GS. So the engine turns slightly faster at the same speed.
08-19-2015, 03:00 PM
#7
Le Mans Master
Since both cars were stick -- the rear end ratios are the same.
So either:
Your 07 was a Z51 and your 13 is base model? (rpm's would be lower now)
Your 07 was a non-Z51, and the 13 is a GS? (rpm's would be higher now)
Either would explain a difference, since the trans ratios are different for Z51 option or GS model than they are for base models. Since you say its higher, I'd agree with ruxvette that your 13 is a GS.
So either:
Your 07 was a Z51 and your 13 is base model? (rpm's would be lower now)
Your 07 was a non-Z51, and the 13 is a GS? (rpm's would be higher now)
Either would explain a difference, since the trans ratios are different for Z51 option or GS model than they are for base models. Since you say its higher, I'd agree with ruxvette that your 13 is a GS.
Last edited by Kent1999; 08-19-2015 at 03:04 PM.
08-23-2015, 01:24 PM
#8
Supporting Vendor
Member Since: Apr 2011
Location: Frederick Maryland
Posts: 3,177
Likes: 0
Received 147 Likes
on
111 Posts
St. Jude Donor '08-'09-'10-'11-'12, '14-'15-'16-'17-'18
Your 07 was a base model (or Z06) and your 13 is a Z51 or GS. MM6 compared to MZ6 ratio transmission.
__________________
08-23-2015, 11:58 PM
#9
Race Director
Member Since: Sep 2007
Location: Peoria/Phoenix AZ
Posts: 16,555
Received 2,058 Likes
on
1,503 Posts
C6 of Year Finalist (performance mods) 2019
Not all tires of the same advertised size are the same height, nor are new vs well worn the same size. A 285/35R19 in one brand is as much as .3" difference as another and wear from new at 10/32 to 2/32 used, accounts for .5" in height. So tires of the "same size" can have a 3% variation and show up as 50 RPM difference at a true 70 MPH on the same car and more if the indicated speed is not the true speed. That doesn't even include tire pressure differences, which can change height too.
