LT1_E85_Corvette

Hello everyone,

Suggesting that the C7 has the same gear ratio's as the base C6, will it now achieve 60mph due to the rev limiter getting raised to 6,700rpm vs the c6's 6,500rpm? How much would 200rpm really help?

Thanks!

FloydSummerOf68

Nope

themonk

How will the 7 speed have the same ratios as the 6

Raitzi

Because the M7 is just tr6060 with one extra gear added on the top.

themonk

6th is already extremely low, I can only imagine what 7th would be.

LT1_E85_Corvette

I wonder how much closer though. I know my C6 with LS3 get's to about 55mph... man they are SOOO close, and I wish they would have just closed the gap, but i'm sure that's more for the higher end models.

Nitrous Oxide

I've read a couple of times that it's exactly what GM did to report their official C6 0 60 figures: all on the first gear, bingo. Isn't it right?

LT1_E85_Corvette

Base c6 doesn't get to 60mph in first gear... only the Z06, and ZR1 achieve this. I was hoping the Base C7 would however, it's starting to look bleak

Nitrous Oxide

I'm not one of those straight line experts we have around here, but I'm not sure you should rev too high for a good 0-60 mph. The torque peaks at a certain RPM on the Vette, around 4000 RPM, and then it goes downward very steeply. I once visited Callaway's site, and they were giving tips for good accelerations and they said to start around 3000 RPM. I was surprised to see that I did it correctly; but simply because I'm not a rev freak.

FloydSummerOf68

Yes, you should start around 3000 for the launch, but I doubt they were saying not to rev it high. You want to rev it as high as it's making power.

Nitrous Oxide

Okay. It's also good to know that not only the torque peaks and goes down, but the power as well (at a different RPM).

FASST LN

I understand wanting to have a good 0-60 time...but the point of the metric is to show the car's ability to accelerate out of the hole and whether that is 0-50 or 0-60, it shouldn't matter.
However, if they offered a DC transmission then you wouldn't care about having to shift before 60 because it wouldn't take (hardly) any additional time.

I personally would prefer closer spaced and smaller gears since they are going to the M7. On a track, you don't ever use 1st gear (except for when you initially start) so having a stronger 2nd, 3rd, and 4th gear would be better for me.

VADanno

The gear chart that was posted on another thread showed the base gearbox shift from first to second at 60 MPH. The close ratio box had lower ratios for 1-3, and after the shift the engine looked to be turning 4400 RPM's in the next higher gear.

69L79

It is my understanding that the C7 Z51 uses the GS gear ratios. A little disappointing to me, being a manual guy, that the "new" MZ6 seven speed just added a seventh overdrive gear. I get it about MPGs. But, I think its a little lame performance wise.

LT1_E85_Corvette

There you go... you achieve 60MPH in first gear! We should see 0-60 times much lower than the C6 Grand Sport then... that car is rated at 3.95sec's 0-60mph and it has to shift once to get to 60mph.

Before I jump the gun, can you find that chart?

ny32182

Got to say either way I don't really get the point of 7 gears especially if it is just an extra overdrive gear. It seems to me that 6th gear in the C6 is already so tall that it is a pure gas mileage gear, and I'm glad it is there but if the M7 uses all the same ratios with just another (THIRD) overdrive gear piled on top, when are you going to actually use it? The car already can't push out 6th the way it is.

If it is not an extra overdrive gear and falls somewherei in the 1-4 territory of the C6 it maybe makes a little more sense, but again we have a big torquey V8 with wide power curves; do we really need a gazillion close ratio gears for good performance? I usually skip a couple gears around town as it is. I'd like to hear the real rational of what the M7 can do that 6 gears can't.

Jawnathin

I thought both the redline (6500rpm) and rev limiter (6600) were the same between both the LS3 and LT1.

EDIT: Also, peak power (5900rpm)

mforman42

Only the Z06 with the 7000 RPM redline; not the ZR1...

CrystalRedMetal ZR-1

The ZR1 gets to 66 mph in first gear. Just so you know.

JoesC5

But the Z06 has a 2.66 first gear and the ZR1 has a 2.29 first gear. More then makes up for the ZR1 having a 500 less redline as far as shifting points goes.