[Z06] Optimum Shift Points For ZO6?
Melting Slicks
Joined: Nov 2003
Posts: 2,155
Likes: 56
From: Escondido CA
if basically stock
performance to me is just before rev limiter hits 6200-6400
and for economy-if you kept in the cags..1st to 20mph with a light foot and directly to 4th and easy as you can be ,on up-driving around like that you would probably get 22-24mph-
but then forget performance-the computer would be so confused the car would probably run like sh^&#,for about 5 hard runs..so what did you gain
around town i get 18 mpg if i run it hard alot about 17 mph
and hwy i get 24-26..why have the z if i'm gonna drive it 1/2 throttle all the time?? gas just hit $2.69 / gal in wonderful kaleforneia
performance to me is just before rev limiter hits 6200-6400
and for economy-if you kept in the cags..1st to 20mph with a light foot and directly to 4th and easy as you can be ,on up-driving around like that you would probably get 22-24mph-
but then forget performance-the computer would be so confused the car would probably run like sh^&#,for about 5 hard runs..so what did you gain
around town i get 18 mpg if i run it hard alot about 17 mph
and hwy i get 24-26..why have the z if i'm gonna drive it 1/2 throttle all the time?? gas just hit $2.69 / gal in wonderful kaleforneia
Instructor
Joined: Mar 2005
Posts: 218
Likes: 0
shifting
I always shift at 3k rpm.. on normal driving. the engine isnt really working at that point, but anyhow, I shift then, all the way up to 5th or 6th gear depending on how fast I want to go. If you stay around 3k you get decent milage.
Team Owner
Joined: Apr 2001
Posts: 26,794
Likes: 614
From: Elmhurst, IL (West Suburb of Chicago) & Home of MEGA Horsepower
St. Jude Donor '06
REV LIMITER is set on a stock Z at 6600, so for optimal ***** out performance, racing, etc., you want to shift as high as you can without hitting the rev limiter (that being 6400 rpms) or 6500 if your a REAL PRO!!!!!!!!!!!!! 
Instructor
Joined: Jul 2004
Posts: 114
Likes: 0
I Think 6400-6500 on the 1-2 & 2-3, but at 6300RPMs on the 3-4. Every time I shift the 3-4 at 6500 my MPH is reduced. Of 8 runs last night the slowest MPH was shifting at 6500, which it always the case when I shift late. At the 3-4 it doesn't cost you much, but I'll take anything I can get.
Here was the lowest MPH of the night, which had started out my best 1/8 mile MPH.
60' ... 1.665 (6500RPMs@ 3-4)
330... 4.786
1/8...7.395
Mph...96.50
1000...9.658
1/4...11.575
MPH...117.40
30 min later I ran this run(6300RPMs@ 3-4)
60'...1.664 (-.001)
330...4.821 (+.035)
1/8...7.426 (+.031)
Mph...95.60 (-.9)
1000...9.678 (+.02)
1/4...11.585 (+.01)
Mph...118.19 (+.79)
I can't say this run alone concludes much, but it doesn't seem to hurt shifting earlier either. I came to this conclusion after months of analyzing simular runs with different shift points. Not saying it's best for all, but it's working for me at this time. After I get a tune this year and raise my Rev limiter, I may try the 6700 range to see what happens.
Here was the lowest MPH of the night, which had started out my best 1/8 mile MPH.
60' ... 1.665 (6500RPMs@ 3-4)
330... 4.786
1/8...7.395
Mph...96.50
1000...9.658
1/4...11.575
MPH...117.40
30 min later I ran this run(6300RPMs@ 3-4)
60'...1.664 (-.001)
330...4.821 (+.035)
1/8...7.426 (+.031)
Mph...95.60 (-.9)
1000...9.678 (+.02)
1/4...11.585 (+.01)
Mph...118.19 (+.79)
I can't say this run alone concludes much, but it doesn't seem to hurt shifting earlier either. I came to this conclusion after months of analyzing simular runs with different shift points. Not saying it's best for all, but it's working for me at this time. After I get a tune this year and raise my Rev limiter, I may try the 6700 range to see what happens.
Le Mans Master
Joined: Jun 2003
Posts: 9,251
Likes: 217
From: 2007 Nat'l Corvette Challenge 11.50 index Champ. New Jersey
Originally Posted by Qksilver
I Think 6400-6500 on the 1-2 & 2-3, but at 6300RPMs on the 3-4. Every time I shift the 3-4 at 6500 my MPH is reduced. Of 8 runs last night the slowest MPH was shifting at 6500, which it always the case when I shift late. At the 3-4 it doesn't cost you much, but I'll take anything I can get.
Here was the lowest MPH of the night, which had started out my best 1/8 mile MPH.
60' ... 1.665 (6500RPMs@ 3-4)
330... 4.786
1/8...7.395
Mph...96.50
1000...9.658
1/4...11.575
MPH...117.40
30 min later I ran this run(6300RPMs@ 3-4)
60'...1.664 (-.001)
330...4.821 (+.035)
1/8...7.426 (+.031)
Mph...95.60 (-.9)
1000...9.678 (+.02)
1/4...11.585 (+.01)
Mph...118.19 (+.79)
I can't say this run alone concludes much, but it doesn't seem to hurt shifting earlier either. I came to this conclusion after months of analyzing simular runs with different shift points. Not saying it's best for all, but it's working for me at this time. After I get a tune this year and raise my Rev limiter, I may try the 6700 range to see what happens.
Here was the lowest MPH of the night, which had started out my best 1/8 mile MPH.
60' ... 1.665 (6500RPMs@ 3-4)
330... 4.786
1/8...7.395
Mph...96.50
1000...9.658
1/4...11.575
MPH...117.40
30 min later I ran this run(6300RPMs@ 3-4)
60'...1.664 (-.001)
330...4.821 (+.035)
1/8...7.426 (+.031)
Mph...95.60 (-.9)
1000...9.678 (+.02)
1/4...11.585 (+.01)
Mph...118.19 (+.79)
I can't say this run alone concludes much, but it doesn't seem to hurt shifting earlier either. I came to this conclusion after months of analyzing simular runs with different shift points. Not saying it's best for all, but it's working for me at this time. After I get a tune this year and raise my Rev limiter, I may try the 6700 range to see what happens.
Based on the 2 run comparison you posted, I'd rather get a lower ET shifting higher than a higher ET to get a slightly higher MPH, no?
Ron
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Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
My experience is that the best times are produced shifting at as high an rpm as possible without kissing or slamming the (6600) rev limiter. The reason that produces best ETs is because each shift will give the most torque AFTER the shift is completed and the pull begins in the next gear. More torque at 4500 than 4200-4300.
The benefit of keeping an MSExcel log of all your passes, the splits, and the incrementals between the splits, is that you learn what factors produce the fastest times. Shift points are certainly key.
Ranger
The benefit of keeping an MSExcel log of all your passes, the splits, and the incrementals between the splits, is that you learn what factors produce the fastest times. Shift points are certainly key.
Ranger
Last edited by Ranger; Apr 4, 2005 at 07:21 AM.
Race Director
Joined: Aug 2000
Posts: 10,649
Likes: 32
From: Central Florida
Originally Posted by ZFORME
Do you guys feel a shift light would be a good purchase to keep off the rev limiter and in the groove for speed?
Ranger
Team Owner
Joined: Jul 2003
Posts: 20,474
Likes: 2
From: Detroit
Originally Posted by ZFORME
Do you guys feel a shift light would be a good purchase to keep off the rev limiter and in the groove for speed?
Mark
Instructor
Joined: Jul 2004
Posts: 114
Likes: 0
Originally Posted by Dr.Ron
Once again, nice runs bro! What rpm were you launching at?
Based on the 2 run comparison you posted, I'd rather get a lower ET shifting higher than a higher ET to get a slightly higher MPH, no?
Ron
Based on the 2 run comparison you posted, I'd rather get a lower ET shifting higher than a higher ET to get a slightly higher MPH, no?
Ron
Notice I was down .035 at the 330. That's why the time was slower. First run took me 4.18 seconds and a gain of 20.9 Mph from the 1/8 to the 1/4. Second run took me 4.159 seconds and a gain of 22.59 Mph. I almost made up the diff by the 1/4 mile mark. So, I think I would have ran faster on my first run if I had shifted sooner on the 3-4. Ranger , I have logged 60+ runs on excel with times of 11.40-11.69 just to compare differences. But, I'm not saying it's fact, it's just what my analysis keeps pointing too. It does make all the since in the world to shift at 6500 RPMs at the 3-4. But, I continue to see lower MPHs and a slightly slower times from a 6500 shift. Heck , just try it out for fun and see what happens.
Instructor
Joined: Jul 2004
Posts: 114
Likes: 0
Originally Posted by robz
Thanks for the details, I appreciate that. Are u powershifting?
Instructor
Joined: Jul 2004
Posts: 114
Likes: 0
Originally Posted by robz
Thanks for the details, I appreciate that. Are u powershifting?