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did you mean to say 2.66 first gear ?
Looks like a base C7 transmission, with the MH3 5th and 6th gear ?
I'm also a 335/25/20 tired car, and trying to decide between the 3.90 or 4.10 ratio. With the 7th gear, the 4.10 would be the gear for me for highway cruising.
did you mean to say 2.66 first gear ?
Looks like a base C7 transmission, with the MH3 5th and 6th gear ?
I'm also a 335/25/20 tired car, and trying to decide between the 3.90 or 4.10 ratio. With the 7th gear, the 4.10 would be the gear for me for highway cruising.
I have the very first C6 Z06-ZR1 4.10:1 differential gear set. As you can imagine, with a 4.10 diff gear set and 650 SAE horsepower traction with a 2.66 1st gear non-existent.
I decided late last year to have Liberty Gears make me a 2.26:1 first gear. Earlier, I had purchased the 0.80 5th gear and the 0.63 6th gear from Liberty. First gear is now much more useful and drivable. And in 7th gear (0.42:1) I average 25 mpg at 1,700 rpms for a 77 to 78 mph cruise.
Did you mess up top speed by doing this? Was looking into the C6 Z06 with 3.90s but would mean going to 6th to hit 200mph which wouldnt happen.
Chris,
MY Z06 has a Cda of .33, and with 650 SAE crankshaft horsepower, a 4.10 R&P, and a .63:1 sixth gear I should be able to achieve 213 mph at 7,000 rpms.
If you are interested in top speed, you could have Liberty make you a 0.66 5th gear and a 0.42 6th gear. That 0.66 5th gear and a 4.10 R&P would make 200 mph at 6,570 rpm.
The 0.42 7th gear and a 4.10 R&P would have you turning 1,700 rpms at 76 mph.
Did you mess up top speed by doing this? Was looking into the C6 Z06 with 3.90s but would mean going to 6th to hit 200mph which wouldnt happen.
FYI...just my take.
My car's chassis dyno says my car's peak rwhp hits around 6700-6800 RPM.
Plugging in my peak HP's (600 SAE rwhp via Dynojet) RPM figures into a calculator shows my car could theoretically hit 203-206 MPH with a 3.90 rear gear and the ZR1 MH3 close ratio transmission, which I currently have.
My car's chassis dyno says my car's peak rwhp hits around 6700-6800 RPM.
Plugging in my peak HP's (600 SAE rwhp via Dynojet) RPM figures into a calculator shows my car could theoretically hit 203-206 MPH with a 3.90 rear gear and the ZR1 MH3 close ratio transmission, which I currently have.
That's great for top end.
Now, what do you do for daily highway driving? I wouldn't want to be having a 0.67 6th gear as my highway gear. Think about the 0.42 gear for 6th gear.
Now, what do you do for daily highway driving? I wouldn't want to be having a 0.67 6th gear as my highway gear. Think about the 0.42 gear for 6th gear.
Yep, that's why I inquired about the C7 Z06 spec TR6070....it has a .45 7th gear
I hear exactly what you are saying but I am less interested in maximum top speed with unlimited runway - more interested in keeping up with some of my friends exotic cars (in mexico ofcourse). Vette has no issue holding its own to 160 but after that shift to 5th it slows right down and gets left behind in the dust after 170.
I hear exactly what you are saying but I am less interested in maximum top speed with unlimited runway - more interested in keeping up with some of my friends exotic cars (in mexico ofcourse). Vette has no issue holding its own to 160 but after that shift to 5th it slows right down and gets left behind in the dust after 170.
Your original question was about messing up top speed, but I'm telling you right now that the difference between the stock Z06 5th gear and the ZR1's MH3 optioned 5th gear is HUGE !!!
Shifting at 7000 RPM into 5th with a stock Z06 transmission's .74 ratio drops you down to 4700 RPM, and the car has to dig itself out of a huge hole.
Shifting at 7000 RPM into 5th with a ZR1's MH3 optioned transmission's .81 ratio drops you down to 5700 RPM..just above peak torque and right into the meat of your power band !!!
If your race goes above 175 MPH, shifting into 6th's .67 gear on a MH3 transmission at 7000 RPM puts you at 5800 RPM....again, right above peak torque and in the meat of your power band.
The downside, as Pumba noted, is that your 70 MPH cruise RPM is now 2300 RPM instead of 1500 RPM.
This is where the TR6070 would come into play, as you'd now have the 7th gear overdrive of .45 (or .42), which then gets you back down to 1600 RPM cruise at 70 MPH
My car's chassis dyno says my car's peak rwhp hits around 6700-6800 RPM.
Plugging in my peak HP's (600 SAE rwhp via Dynojet) RPM figures into a calculator shows my car could theoretically hit 203-206 MPH with a 3.90 rear gear and the ZR1 MH3 close ratio transmission, which I currently have.
Sweet ratios Brother! Who did the transmission/diff work for you, or did you do the swap yourself?
Yes you are correct I did mention that, apologies on the confusion.
I agree with you on all accounts re: powerband on gear changes. I wonder if there are gears I can swap into the t56 to get those 5th and 6th ratios...or if they can handle it in the first place (may have been a main reason why they went with a 6060 vs t56 in the first place).
As for the cruise rpm...doesnt bother me at all.
Originally Posted by FNBADAZ06
Your original question was about messing up top speed, but I'm telling you right now that the difference between the stock Z06 5th gear and the ZR1's MH3 optioned 5th gear is HUGE !!!
Shifting at 7000 RPM into 5th with a stock Z06 transmission's .74 ratio drops you down to 4700 RPM, and the car has to dig itself out of a huge hole.
Shifting at 7000 RPM into 5th with a ZR1's MH3 optioned transmission's .81 ratio drops you down to 5700 RPM..just above peak torque and right into the meat of your power band !!!
If your race goes above 175 MPH, shifting into 6th's .67 gear on a MH3 transmission at 7000 RPM puts you at 5800 RPM....again, right above peak torque and in the meat of your power band.
The downside, as Pumba noted, is that your 70 MPH cruise RPM is now 2300 RPM instead of 1500 RPM.
This is where the TR6070 would come into play, as you'd now have the 7th gear overdrive of .45 (or .42), which then gets you back down to 1600 RPM cruise at 70 MPH
Sweet ratios Brother! Who did the transmission/diff work for you, or did you do the swap yourself?
I had a friend put the transmission in for me, but I've got everything pulled out at the moment in anticipation of the 3.90/4.10 ring and pinion set being available in the next 30-60 days.
I'll be doing all the work myself going forward now that I have the QuickJack BL-5000 lift
Yes you are correct I did mention that, apologies on the confusion.
I agree with you on all accounts re: powerband on gear changes. I wonder if there are gears I can swap into the t56 to get those 5th and 6th ratios...or if they can handle it in the first place (may have been a main reason why they went with a 6060 vs t56 in the first place).
As for the cruise rpm...doesnt bother me at all.
No worries, bud
I don't think there's a comparable 5th and 6th gear set for the T-56.
I had a friend put the transmission in for me, but I've got everything pulled out at the moment in anticipation of the 3.90/4.10 ring and pinion set being available in the next 30-60 days.
I'll be doing all the work myself going forward now that I have the QuickJack BL-5000 lift
Very cool
Spent about an hour in a half going over the different ratios here. If you’re up for doing custom trans ratios let me know, be more than happy to share some interesting data points I’ve found with you.
I’m going to look into getting these ratios made and swap them out.
Robert Saar
714-308-9704
Last edited by HC Mechanic; 12-29-2017 at 12:14 PM.
So from what I have gathered you need the full tr6070 from the c7 , the modified torque tube, linkage , driveshaft etc - my question . Is the c6 rear diff required to do this swap and if so is the c6 cradle being used as well ? Is there any one thT has looked into using the c7 differential or is that not possible any help is appreciated just fyi IM trying to get a tr6070 into my 01 z06 thanks in advance
Last edited by Fabperformance; 09-18-2018 at 10:14 AM.
From what I have gathered you need the full TR6070 from the C7, a modified torque tube, Shifter linkage, driveshaft, etc. - My question: Is the C6 rear differential required to do this swap, and if so, is the C6 cradle being used as well ? Is there any one that has looked into using the C7 differential, or is that not possible. Any help is appreciated. Just for your information, I'm trying to get a TR6070 into my 01 z06.
Thanks in advance.
Cody,
My article on the Corvette Forum clearly explains the steps and parts that you need to do the swap. The C5 differential is Junk! ! ! So you need a C6 ZR1 differential. Equip it with a Motive 4.10:1 ring and pinion, mounted on a WaveTrac differential. You also need the C6 rear cradle and differential mounts. Good luck with your project .
Thanks for the helpful info is the z06 c6 diff sufficient or does it have to be zr1 , also i noticed the tr6070 out of the 2015 z06 has a pretty similar ratio to your setup . Would you reccomend that coupled with a 4.10 pinion ?
thanks again for the help
Thanks for the helpful info. Is the Z06 C6 diff sufficient, or does it have to be zr1. Also I noticed the TR6070 out of the 2015 Z06 has a pretty similar ratio to your setup. Would you recommend that coupled with a 4.10 pinion ?
Thanks again for the help
The C6 Z06 Differential housing will work, but it is not as strong and durable. The C7 Z06 trans would work, but its 7th gear is a little steeper than the 0.42:1 7th gear that I am using.
12-18-2017, 01:54 PM
