ZR1 vs. Base/Z06 Trans Ratios
12-31-2017, 05:52 PM
#1
Burning Brakes
Thread Starter
ZR1 vs. Base/Z06 Trans Ratios
I did the comparison at 7,500rpm, because that’s where I’m planning my shift point. I’ve also included the rpm the engine will drop to, given the correlating rpm as a shift point.
Next I looked at 2,300rpm, as I feel that’s about the max rpm you would want to cruise at on the street. Freeway speeds here in CA are 80-90mph depending on the day, so 6th gear would be a factor for crusing.
Currently I’ve got a Z51, and honestly the ratios suck on the road course; especially 5th gear. So i’m Looking into both of these gearsets for replacement. I’m leaning towards the ZR1 box after comparing this data.
Next I looked at 2,300rpm, as I feel that’s about the max rpm you would want to cruise at on the street. Freeway speeds here in CA are 80-90mph depending on the day, so 6th gear would be a factor for crusing.
Currently I’ve got a Z51, and honestly the ratios suck on the road course; especially 5th gear. So i’m Looking into both of these gearsets for replacement. I’m leaning towards the ZR1 box after comparing this data.
Last edited by HC Mechanic; 12-31-2017 at 05:55 PM. Reason: Additional clarification
12-31-2017, 09:01 PM
#2
Safety Car
in racing you VERY rarely EVER use anything more then 1:1 that would be 4th gear. that's why you don't like 5th on a road coarse, and when you went thru the instruction in order to get on the road coarse did you listen to them? 6th gear is for fuel mileage only
Last edited by CMY SIX; 12-31-2017 at 09:03 PM.
12-31-2017, 09:33 PM
#3
Burning Brakes
Thread Starter
Honestly, I think we need to get on phone call Marine
Give me a call Hard Charger: 714-308-9704
01-01-2018, 03:08 PM
#4
Burning Brakes
Your ratios are a tad off on the ZR1, also your Z51 car has different ratios than a typical C6 base.
ZR1
First: 2.29
Second: 1.61
Third: 1.21
Fourth: 1.00
Fifth: 0.82
Sixth: 0.68
Z51
First: 2.97
Second: 2.07
Third: 1.43
Fourth: 1.00
Fifth: 0.71
Sixth: 0.57
C6 Base
First: 2.66
Second: 1.78
Third: 1.30
Fourth: 1.00
Fifth: 0.74
Sixth: 0.50
ZR1
First: 2.29
Second: 1.61
Third: 1.21
Fourth: 1.00
Fifth: 0.82
Sixth: 0.68
Z51
First: 2.97
Second: 2.07
Third: 1.43
Fourth: 1.00
Fifth: 0.71
Sixth: 0.57
C6 Base
First: 2.66
Second: 1.78
Third: 1.30
Fourth: 1.00
Fifth: 0.74
Sixth: 0.50
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HC Mechanic (01-01-2018)
01-01-2018, 04:06 PM
#5
Since you not going to use 6th on the track, it can stay the same for highway driving.
Now back to the road coarse, and we need from corner apex to final exit speeds to figure out the best box gearing for that track.
Once you have such, then is easy to change the gears out in the trans to gear it ideally for the track your running. Hence down the straights, not a problem doing shifts then, but on the way out of the apex until the straight second, where you don't want to be shifting, and in the meat of the rpms isntead.
Also, do not think linear gearing ratios through the gear sets, but instead corning speeds and the needed gearing to make the trans work for the track technical sections.
Now back to the road coarse, and we need from corner apex to final exit speeds to figure out the best box gearing for that track.
Once you have such, then is easy to change the gears out in the trans to gear it ideally for the track your running. Hence down the straights, not a problem doing shifts then, but on the way out of the apex until the straight second, where you don't want to be shifting, and in the meat of the rpms isntead.
Also, do not think linear gearing ratios through the gear sets, but instead corning speeds and the needed gearing to make the trans work for the track technical sections.
Last edited by Dano523; 01-01-2018 at 04:07 PM.
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HC Mechanic (01-01-2018)
01-01-2018, 05:04 PM
#6
Burning Brakes
Thread Starter
I’ll attach a screenshot of what I went off of for ratios...looks like it’s from a factory Corvette book of some sort, not 100% sure though.
01-01-2018, 06:15 PM
#7
Tech Contributor
Also depends on power. The ZR-1 ratios take into account the power of the LS9. The base and Z06 ratios are ideal for road course work. The Z51 and GS were advertised for auto-x cross, hence the steep gears.
Curious what power level you have and the tracks you're running that you need 5th gear with a 7500rpm shift point. I run Willow Springs, Streets of Willow, Buttonwillow, Auto Club Speedway (ACS), etc and although I do end up about 500 rpm short due to the GS gear ratios, 5th buys nothing except at ACS.
Curious what power level you have and the tracks you're running that you need 5th gear with a 7500rpm shift point. I run Willow Springs, Streets of Willow, Buttonwillow, Auto Club Speedway (ACS), etc and although I do end up about 500 rpm short due to the GS gear ratios, 5th buys nothing except at ACS.
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HC Mechanic (01-07-2018)
01-02-2018, 06:21 PM
#8
z51 was geared for autocross speeds, where you banging through 1/2/3 mostly isntead.
Last edited by Dano523; 01-02-2018 at 06:22 PM.
01-02-2018, 07:25 PM
#9
Drifting
01-02-2018, 08:03 PM
#10
Burning Brakes
Thread Starter
Yeah, been there tried that. 1st gear is everything but useable if you’re at any power level past bolt-ons. What the car truly needs is an advanced traction control system. Probably the weakest point of the car, besides the standard rubber IMO.
01-02-2018, 08:11 PM
#11
Burning Brakes
Thread Starter
Also depends on power. The ZR-1 ratios take into account the power of the LS9. The base and Z06 ratios are ideal for road course work. The Z51 and GS were advertised for auto-x cross, hence the steep gears.
Curious what power level you have and the tracks you're running that you need 5th gear with a 7500rpm shift point. I run Willow Springs, Streets of Willow, Buttonwillow, Auto Club Speedway (ACS), etc and although I do end up about 500 rpm short due to the GS gear ratios, 5th buys nothing except at ACS.
Curious what power level you have and the tracks you're running that you need 5th gear with a 7500rpm shift point. I run Willow Springs, Streets of Willow, Buttonwillow, Auto Club Speedway (ACS), etc and although I do end up about 500 rpm short due to the GS gear ratios, 5th buys nothing except at ACS.
I agree, it’s primarily the fact that 1st is too short and that just puts too large of a gap leading up to the 1.00 fourth. Fifth is a big problem at ACS as you said, it just bogs right down. Currently making about the same power as a standard ZR1. With Tony’s heads, cam, valvetrain, intake, and Burns headers I shoud be closing on 700 to the tire; but time will tell.
01-05-2018, 10:46 AM
#12
Tech Contributor
I agree, it’s primarily the fact that 1st is too short and that just puts too large of a gap leading up to the 1.00 fourth. Fifth is a big problem at ACS as you said, it just bogs right down. Currently making about the same power as a standard ZR1. With Tony’s heads, cam, valvetrain, intake, and Burns headers I shoud be closing on 700 to the tire; but time will tell.
