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I don't find the MEK shown in the link you provided.
Okay, I'll walk you through it.
First go to the 2015 Corvette ordering guide, page 83 and you will see(under the Z06 listing) the following..."MEK Transmission, 7-speed manual with Active Rev Matching".
Then go to the GMPowertrain link I posted.
Look for drop down menu box that says "select product'.
click on "transmissions"
then a second menu box will appear.
click on the down arrow next to the box.
Then scroll down to the very bottom of the list of transmissions.
You will see a line that says "Tremec TR6060 six speed manual (MEK) ***NEW***. NOTE: The "TR6060 six speed" is a typo as you will see in the next step.
click on center box where it says "specs"
You will find all the information on ratios, etc.
Then click on the right box that says "vehicle application" and you will see that the "MEK" transmission is for the 2015 LT4 used in the Z06, just as the ordering guide states.
Slightly different question, but relevant to the topic---can the Z06 reach 60 in first gear or is a shift required? I'm assuming a shift is required since the 0-60 time was longer for the manual, but curious if anyone knows for sure...
Joe. The charts you provided DO show the z06 ratios identical to the z51.
Not the charts I provided as I didn't provide any charts. I did provide step by step instructions on how to use the ordering guide and the GmPowertrain website.
If you had followed my instructions I posted in post #6, you would have found the following chart on the GMPowertrain site.
The information I posted in post #3 shows the difference in the three different manual transmissions used in the 2015 C7.
Slightly different question, but relevant to the topic---can the Z06 reach 60 in first gear or is a shift required? I'm assuming a shift is required since the 0-60 time was longer for the manual, but curious if anyone knows for sure...
The C7 Z06 will hit 65 MPH in 1st gear. The reason for the slower 0-60 on the M7 is because the A8 is geared much more aggressively.
Understand your info says the ratios are the same as the C7 Z51.
However we can determine that this isn’t likely. I respectfully submit your charts are probably incorrect. GM's powertrain web site is probably correct. With over 600ft/lbs of Tq those ratios would be way to short. The car would be traction limited and over geared. One would expect the C7 Z06 to have gearing similar to the ZR1 because of the similar power and tq levels. The ZR1 gearing happens to be the same as GM's powertrain website post for the C7 Z06 for the first 6 gears. (Tremec TR6060 close-ratio six-speed manual,Gear ratios (:1):First:2.29 Second: 1.61 Third: 1.21 Fourth: 1.00 Fifth: 0.82 Sixth: .68 Reverse: 3.11 Final drive ratio: 3.42)
Additionally the Viper which has similar power as both the ZR1 and the C7 Z06 has similar gear ratios to those Gm's powertrain web site presents for the C7 Z06.
If you look further there are several other sources on the net that have the gearing for the C7 Z06 being the same as the ZR1 but with an additional gear. (7th)
Last edited by dar02081961; 11-04-2014 at 11:28 AM.
Understand your info says the ratios are the same as the C7 Z51.
However we can determine that this isn’t likely. I respectfully submit your charts are probably incorrect. GM's powertrain web site is probably correct. With over 600ft/lbs of Tq those ratios would be way to short. The car would be traction limited and over geared. One would expect the C7 Z06 to have gearing similar to the ZR1 because of the similar power and tq levels. The ZR1 gearing happens to be the same as GM's powertrain website post for the C7 Z06 for the first 6 gears. (Tremec TR6060 close-ratio six-speed manual,Gear ratios (:1):First:2.29 Second: 1.61 Third: 1.21 Fourth: 1.00 Fifth: 0.82 Sixth: .68 Reverse: 3.11 Final drive ratio: 3.42)
Additionally the Viper which has similar power as both the ZR1 and the C7 Z06 has similar gear ratios to those Gm's powertrain web site presents for the C7 Z06.
If you look further there are several other sources on the net that have the gearing for the C7 Z06 being the same as the ZR1 but with an additional gear. (7th)
The limiting factor is the Tremec transmission's tail shaft. Put 650 lb-ft X 2.97 and it would twist. 650 lb-ft X 2.29 and it won't twist.
The limiting factor is the Tremec transmission's tail shaft. Put 650 lb-ft X 2.97 and it would twist. 650 lb-ft X 2.29 and it won't twist.
Good point. But tremec could easily solve this issue if they wanted to.
That hasnt been neccessary yet becuase the cars they supply these transmissions for cant put that much tq to the ground without breaking traction anyway.
I understand what you mean by the output shaft being the limiting factor for the transmission. And I can agree 650ft/lb X 2.97 probably exceeds the OEM’s published reliability safety margin for the Tremec’s output shaft. That said, you and I both know there are folks out there with 2013 Shelbys putting more than 1930 ft/lbs (650x2.97) or (725x2.66) through unmodified Tremec’s that haven’t twisted output shafts. Allbeit may be because they are not hooking up enough to stress the output shaft.
11-04-2014, 07:32 AM
Did the same for me when I first reviewed the site. Seems GM needs some qualified people to proof read their websites, press releases etc.
