Mr. Gizmo

Car and Driver reported a 0-150 time for the z06 of 17.3 seconds and 16.7 for the Zr1 as I recall.

As the z06 and zr1 both have 3:42 axle ratios would the z06 performance improve or be worse if the transmission gear ratios on 1 thru 6 was the same as the zr1?

Corvee

If by "performance" you mean 0-150 I don't think it matters, for at 150 you are probably still in 4th gear, which ratios are both 1.0 to 1.0. The Z06 gears are taller 1 through 3 while 5th gear is a tad taller in the ZR1 @0.81 compared to the Z06's 0.74. The 6th gear is useless on the Z06 (0.50). So above 150 you might see a difference but below you are better off with the Z06's ratios.

JetskiMobile1

Do the Z06 and ZR1 not have the same transmission? When my 09 Z06 trans went out and was replaced the part number they used listed for the Z06 & ZR1.

Mr. Gizmo

Different gear ratios in the transmissions. A big reason the Z06 gets much better gas mileage then the zr1.

6th gear is an over drive and 5th gear is the gear you achieve top speed in for the z06

6th gear is not an over drive in the zr1 and 6th is the gear you achieve top speed in for the zr1.

JoesC5

In 1st, 2nd & 3rd gears, the ZR1 transmission in a Z06 would hurt acceleration.

4th gear-no change.

5th gear, the ZR1 transmission in a Z06 would help acceleration.

6th gear, the ZR1 transmission in a Z06 could cause you to use more gas at crusing speed.

GM says the top speed of the Z06 is 198 MPH.

198 MPH with the Z06 transmission = 6060 RPM, well below redline in 5 th gear.

198 MPH with the ZR1 transmission = 6915 RPM, just below redline in 5th gear

So, I would think there would be no change in top speed between the two transmissions in a Z06

My choice would be a transmission with the ZR1 gears in 1st through 4th and the Z06 gears in 5th & 6th, combined with a 3.90 rear axle ratio.

lemans

In both cars 5th and 6th are overdrives, but different ratios.
1st through 3rd are underdrives again different ratios
Only 4th gear is identical witch is 1to1 ratio with 3.42 final drive rear.

BLW BY

I don't know about any one else, but for me,
the ZR1 trans offers a taller 1st which means closer ratios between 2-3-4.
All good because both trans ratios in 4th are 1:1.
It gets better, 5th and 6th are both closer ratios after 4th (1:1).
Do the math, except for drag racing on DR's on a prep track, a little taller 1st gear gives you 2-3-4-5-6 close ratio gear box.
How much time do you really spend in first gear and how much traction do you have with either trans.

Hands Down!

Corvee

Actually 1st gear is "taller" with a higher ratio in the z06 @2.66 compared to the ZR1's 2.29. True, the ZR1's ratio is closer 1 to 2 @2.29 to 1.61 compared to the Z06's 2.66 to 1.78 but comparatively the same 2-4. At 4th you are at 1.0 to 1.0 with both and I doubt you will see 5th until above 150 which was the OP's premise.

LEJ ZO6

My ZO6 is used for daily driving.

1st gear in the ZO6 is so short I find it useless. In normal driving you shift out of first almost immediately. In spirited driving you have to feather the throttle to get any traction. I would think the ZR1 1st gear would help the ZO6 a little in both of these situations. Closer ratios between 2-3- & 4 from the ZR1 seem like a good idea. I'd keep the 5th & 6th ZO6 ratios the way they are.

Black_Mamba

Hello. The ZR1 has a 6500rpm redline. The Z06 is set at 7000rpm. First gear at redline on the Z06 with ZR1 trans would be about 70mph. Top of fourth on the Z06 with stock trans is WELL ABOVE 150 at around 162mph.

0Jeremy@RPMTransmissions

For what it's worth, Lingenfelter's ZR1 went faster in the 1/4 mile using the Z06 transmission ratios. I think the Z06 performance would suffer using the higher 1-3 ratios because they don't make the torque like the LS9 does. If the Z06 was heavily modified and made a lot of lower end torque the ZR1 ratios might be more desireable. It is really a case by case decision that would need to be made.

tjwong

That is what I am hoping for in my car. I have a new all forged LS7 with a Maggie TVS2300 sitting on top. The Maggie kit is modified with LPE's 10 rib front drive with an overdrive balancer, their 50mm cogged drive that is also a 1.15:1 overdrive for the rear drive, plus I have their ported LS7 heads and all the goodies inside the engine. Planned boost levels are 14 PSI max. Sometime ago John at 21st Century completed a similar package that made over 750 whp, so this should be pretty similar but with a few more improvements.

Lawdogg

A Z06 will exceed 60 mph in 1st gear. How is that short? In contrast, a C5 Z06 does have a short 1st gear. It will only do 40 something in 1st.

04_Z06_CE

Thats cause of the C5Z MN12 gears right ?

JoesC5

If the Z06 has the T56 trans then it would have the same width gears as the C5, but if the Z06 has the TR-6060 then the gears are 20% wider and the sychros narrower the the C5 gears.

Gary2KC5

the C5 had M6 and the C5Z had M12. the C6Z got the M6 gears so it could make the 0-60 #'s for press and the X51 got the M12 gears.

I'm not sure what gears the ZR1 has...I would just take a guess at the M12's.

When comparing the M6 gears against the M12's 1-2-3 would be quicker if the M12's were in the C6Z06...one think I was really disappointed in...sacrificing over all performance for a #

Corvee

For reasons cited I am satisfied with my T56 1-4 ratios. I considered changing to the ZR1 5-6 gears. A bit taller 5th - 0.84 compared to the Z06's 0.74 and the 0.67 6th compared to the Z06's 0.50 cruiser gear. Problem is limited source. RPM will change the gears for trans rebuild (or swap) but I was told the gears are semi-hellical and very noisy. Anyone have ideas?