stevette17

Are they different from a reg c6 ? If so is there any marking in the actual trans to show this?

Street Rat

My Z51 has a 2.73 and it says that on the exterior of the transaxel case.

eboggs_jkvl

I can give you the gearing.

stevette17

[QUOTE=Street Rat;1576511781]My Z51 has a 2.73 is yours auto? so what will the manual be stamped as ? is it stand on the diff or on the trans?

5 Liter Eater

I hate my Z51 gearing. Doesn't suite roll racing in Mexico or The Mile.

Nice table.

stevette17

i cant see the table im using my bb.

whats should mine say i have a manual z51.

what gearing is preferred? z51 or reg c6 and why?

any idea where exactly it is stamped?

Mike's LS3

Z51 Manual transmission gears

1st 2.97
2nd 2.07
3rd 1.43
4th 1.0
5th .71
6th .57
Rev. 3.28

All manuals came with 3.42 differential gears.

The advantage of the manual Z51 gears is coming off the line and out of turns with a higher numerical total gear ratio. Personally, I prefer the Z51 gearing along with the rest of the option. However when racing, the bigger advantage goes to the more experienced driver.

stevette17

Where is it stamped on trans???

stevette17

Where is it stamped on trans and how do they differenciate z51 and reg c6.

JoesC5

If the transmission is in the car, look at the RPO list on the glovebox door and see if it has the Z51 option.

stevette17

I wanna see if my trans was replaced...

JeffChaPz

How do gear ratios work or when would you feel the difference on a basic manual trans compared to a manual z51 pkg?

fnbrowning

I'm not sure I'd agree with the Z51 not doing as well at top end.
If you're above 140mph, I think that Z51 5th ratio @ .81 will give you more acceleration than the standard coupe can muster.

For instance; my LS1 T/A had a 0.74 5th gear, and she was still pulling at 155mph with an engine that didn't have the torque of the LS3.

JoesC5

Actually, the fifth gear in a Z51 manual is .71 vs the .74 in the non Z51 transmission, so the non Z51 would have a slight advantage. You were looking at the transmission ratios for the ZR1.

JoesC5

In first gear at 5,000 RPM a Z51 transmission car will be doing 39 MPH.

In first gear at 5,000 RPM a non-Z51 transmission car will be doing 43.6 MPH.

Mike's LS3

Depends how you view it. The 2008-9, Z51, manual, NPP was able to achieve 190 mph in 5th gear at 6000 rpm on GM's closed circuit test track. This was partly due to the .71 5th gear in the Z51 manual transmission. But we are probably not going to see those speeds, right?

JeffChaPz

would you recommend the z51 pkg for someone who is not looking to bring his car to the track?

JoesC5

I was thinking about acceleration more then top speed. The lower gear in the Z51 transmission would help there. The torque multiplication helps.

As far as top speed, both transmissions will aero out before you RPM out in 5th gear.

Z51 trans will see 190 MPH at 5820 RPM.
Non Z51 trans will see 190 MPH at 6060 RPM.

Both well below the rev limiter so it depends at which RPM the horsepower starts dropping off and the engine can't overcome the aero drag. The LS3 hits max horsepower at 5900 RPM. Close call on which is better.

Mike's LS3

I have never tracked my 08 coupe, manual, Z51, NPP, 35k miles and enjoy the Z51 package every time I drive it. I disagree with those who say the Z51 package is for people who want to track the car. If that was true, then the Z06 and ZR1 are also for those who track their cars. The Z51 package is for those who enjoy a handling package that enhances the corvette's ability. The Z06 takes it to another level and so does the ZR1. I would not own a vette without it!

bearman95