mitchdb

Gotta question about gear ratio and speed.

T56 6 speed manual (Tremec)

Z06 1st gear - 2.66 ZR1 2.29:1
Z06 2nd gear - 1.78 ZR1 1.61:1
Z06 3rd gear - 1.30 ZR1 1.21:1
Z06 4th gear - 1.00 ZR1 1:1
Z06 5th gear - 0.74 ZR1 0.81:1
Z06 6th gear - 0.50 ZR1 0.67:1

I'm not sure about RPM's Vs Speed Per each Individual Gear so I'm just using made up RPM vs Speed

In the Z06 category, would a set RPM be cut in Half or Doubled EXACTLY if comparing 4th gear to 6th gear? For example (RPM Method) would 3000 RPM's @ 70 MPH in 4th gear (Gear Ratio 1.00) equal 1500 RPM's @ 70 MPH in 6th gear (Gear Ratio .50)? Or (MPH Method) 3000 RPM's @ 70 MPH in 4th gear equal 3000 RPM's @ 140 MPH in 6th gear? Which would equal 280 MPH in 6th gear, if it were able to pull that gear, so I'm not saying that it will pull to 280 MPH.

These all make sense to me but are there other factors like slippage?

Just curous about this stuff!

Thanks

50 4Ever

Don't know rpm's but the ZR1 has a higher 1st gear and can attain top speed in 6th.

Check out some calculation websites like ----> this.

glass slipper

Your analysis is correct and there is no slippage in the transmission. If the clutch is slipping, that's another story. The ZR1 transmission would be preferred for racing assuming you can optimize the rear end ratio.

JMZR1

Just mod the C6Z06 to have over 600hp, but give it 3.73 gearing. The videos below show that the car can still effortlessly reach 200mph and very quickly too. This is what I would do because I the best of both worlds. That, or just mod a ZR1. Etiher setup will be wicked fast and giving a ZR1 3.73 gears as well would be insane with mods as well. Just make sure your driver mod is engaged properly, otherwise none of that will matter.



Just to show how much the driver mod helps.

1972bluelt1

Didn't think gear upgrades were available for these cars.

JoesC5

Only the 2006 and 2007 Z06's had the T-56 transmission. From 2008 up and all years ZR1's, had the TR-6060 transmission.

Also the ZR1 had two different transmissions available with different 5th & 6th gear ratios.

Dan_the_C5_Man

Interesting thread - pretty obvious why we (NA LS7 cars) got hosed on the top 2 cogs - GM knew what they SHOULD have been, but couldn't pull it off in the name of keeping our gas guzzler tax at bay - they didn't have this issue with the ZR-1, as they knew that goose was already cooked.

Sounds like the hot set up is Z 1-4 and ZR-1 5-6.

erick_e

Really decent calculator here.

http://fitbodyshop.net/gear/index.php

ZO ZICK

I feel like the T-56 tranny on a Z06 its good until I hit 5th gear
I fell like the RPM's drop and loose speed

I'm I wrong?

Or is it me?

JoesC5

Depends on what year(and option) ZR1 transmission you are talking about. The last couple of years of the ZR1 it ZR1 had the same 5th & 6th gear ratio's as the Z06(unless you had the PDE option).

I wish my Z06 had the .81 5th and .67 6th gear, but my highway mileage would suffer in 6th gear, but I would have much better acceleration in 5th gear(160+ MPH) and still be able to hit 200 MPH at 7,000 RPM in 5th gear.

But, I do drive many more miles cruising at 70-80 MPH on the highway than I do driving 160 plus MPH in 5th gear.

If a 3.90 rear gear were available to fit the Z06 differential, I would rather have the 2013 ZR1(non PDE) gear ratios in all 6 gears.

Z06 1st through 4th with the early year ZR1(and PDE option) 5th and 6th gears with the stock 3.42 rear gear.

2.66 X 3.42 = 9.1
1.78 X 3.42 = 6.09
1.30 X 3.42 = 4.45
1.00 X 3.42 = 3.42
.81 X 3.42 = 2.77
.67 X 3.42 = 2.29

With the late ZR1 transmission with a 3.90 rear gear.

2.29 X 3.90 = 8.58
1.61 X 3.90 = 6.28
1.21 X 3.90 = 4.72
1.00 X 3.90 = 3.90
.74 X 3.90 = 2.89
.50 X 3.90 = 1.95

Even through I would have less gearing in 1st, I should have less spinning, giving me better aceleration.
Better acceleration in 2nd gear.
Better acceleration in 3rd gear.
Much better acceleration in 4th gear.
Better acceleration in 5th gear, but would hit the limiter at 192 MPH.

No rice 7.0

HOW was the gearing changed? I need to know

Pb82 Ronin

Might need to start your own thread dude...this one is 10+ years old.

Pb82 Ronin

Wasn't being snide dude. That's kind of a forum thing. The corvette world has changed a great deal since this thread had started...IE new gear ratios, trans ratios/options, etc. All I was trying to do was help you get more answers for your question than just mine...but whatever man. It's just me being a "tough guy" I guess. Enjoy the lack of responses from the dead thread.