ZZ502 idle mix tuning
Thread Starter
Burning Brakes
Joined: Feb 2002
Posts: 752
Likes: 31
From: Melbourne Australia
Thanks Leigh1322,
I actually have a TKO 600 5 speed with 0.82 5th gear ratio and 3.08 rear.
The speedometer is very accurate but not so sure about the tach. That said, I cruise at 70mph with an indicated 2300rpm give or take and around 2000rpm at 60mph.
It's very driveable in 5th and rarely need to go back to 4th above 45mph.
Joe
I actually have a TKO 600 5 speed with 0.82 5th gear ratio and 3.08 rear.
The speedometer is very accurate but not so sure about the tach. That said, I cruise at 70mph with an indicated 2300rpm give or take and around 2000rpm at 60mph.
It's very driveable in 5th and rarely need to go back to 4th above 45mph.
Joe
Old Pro Solo Guy
Joined: Dec 2017
Posts: 8,001
Likes: 4,358
From: Marlton NJ
That is good news!
My setup is the factory 3.36, but I have the .68 OD TKX. Mine top gear should be very similar to yours, just a couple less, 2000 @ 70 and 1730 @ 60 mph, 1500 @ 52+
But I do like the smaller and nice even gear drops your CR version has between the gears.
Mine is more like a 4sd with a bigger drop into OD for cruising.
Close enough either way with all that torque!
Enjoy the road trips!
My setup is the factory 3.36, but I have the .68 OD TKX. Mine top gear should be very similar to yours, just a couple less, 2000 @ 70 and 1730 @ 60 mph, 1500 @ 52+
But I do like the smaller and nice even gear drops your CR version has between the gears.
Mine is more like a 4sd with a bigger drop into OD for cruising.
Close enough either way with all that torque!
Enjoy the road trips!
Thread Starter
Burning Brakes
Joined: Feb 2002
Posts: 752
Likes: 31
From: Melbourne Australia
Hi Leigh1322,
Hopefully you'll get better than 16 MPG.
On the long trips I have to stop for fuel at least every three hours. The guys with the newer vettes fill up every second stop!
Joe
Hopefully you'll get better than 16 MPG.
On the long trips I have to stop for fuel at least every three hours. The guys with the newer vettes fill up every second stop!
Joe
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,098
Likes: 9,229
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
I get 12 with my 5 speed and 4.11 gears. Mostly always on backroads. 15 or better is awesome and Im jealous
Old Pro Solo Guy
Joined: Dec 2017
Posts: 8,001
Likes: 4,358
From: Marlton NJ
Looks like you have about 13.8 to 14.5 AFR @ 2000-2300, at your cruise speed.
And got 15.6 mpg there, on a long road trip.
I am going to shoot hard for 16 AFR @ a slightly lower 2000 rpm cruise.
The math says I could get 18mpg or even more.
I like a challenge.
I did find two reports of 454s getting 19 mpg, so I am hopeful!
And got 15.6 mpg there, on a long road trip.
I am going to shoot hard for 16 AFR @ a slightly lower 2000 rpm cruise.
The math says I could get 18mpg or even more.
I like a challenge.
I did find two reports of 454s getting 19 mpg, so I am hopeful!
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,098
Likes: 9,229
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
I hope i can get more than 12 mpg
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,098
Likes: 9,229
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
Well if each one gets 2 mpg then thats 16 mpg...right!!??
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