shifting speeds
03-06-2012, 01:03 PM
#1
3rd Gear
Thread Starter
Member Since: Feb 2012
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
shifting speeds
i have a 1990 L98 6-speed vette and my tach doesnt read correct. i can shift fine by sound but would like to know at what speeds in MPH should i shift into 2nd 3rd and on to get the maximum performance out of every gear
We all have different gear sets so MPH indication is moot.
03-06-2012, 02:56 PM
#4
The gear ratios in the transmission are the same throughout the years. If you know your rear end gear ratio and your tire size, assuming your engine is stock, we can give you some pointers. The L98 will certainly rev beyond the point of making any useful power.
One little problem though, even you know the best theoretical speed to shift at, the speedo can't update as fast as the car can accelerate so it's kinda hard to judge by that.
One little problem though, even you know the best theoretical speed to shift at, the speedo can't update as fast as the car can accelerate so it's kinda hard to judge by that.
03-06-2012, 04:22 PM
#6
Which also can't update as fast as the car can accelerate.
To the OP, if you can figure out your final drive ratio and post your tire size I've got a spreadsheet that will show your road speed at any given rpm in any gear. You might find it handy someday.
To the OP, if you can figure out your final drive ratio and post your tire size I've got a spreadsheet that will show your road speed at any given rpm in any gear. You might find it handy someday.
03-06-2012, 04:29 PM
#7
Team Owner
Member Since: Feb 2003
Location: Sitting in his Nowhere land Hanover Pa
Posts: 49,066
Received 6,979 Likes
on
4,799 Posts
2015 C2 of Year Finalist
my bet that the wire lead on the dizzy broke off. had that happen already on HEI. very easy fix
03-06-2012, 05:02 PM
#8
Race Director
Well, apparently my last post was offensive.
If you want to tape a spreadsheet to your dash, go for it but the answer is simple. If you want to know when to shift, fix the tach. Doing it by speed is not the right answer no matter how anybody tries to spin it.
If you want to tape a spreadsheet to your dash, go for it but the answer is simple. If you want to know when to shift, fix the tach. Doing it by speed is not the right answer no matter how anybody tries to spin it.
03-06-2012, 05:13 PM
#9
Maybe just maybe the problem with the tach is going to be very costly to fix such as requiring a whole new cluster and he doesn't have the money right now. In the mean time he wants to get some idea what his revs are based on road speed.
It's simple math and it's not an unreasonable thing to ask.
It may not be the BEST answer, but it is a REASONABLE answer until such time as he can fix the tach.
It's simple math and it's not an unreasonable thing to ask.
It may not be the BEST answer, but it is a REASONABLE answer until such time as he can fix the tach.
03-06-2012, 05:33 PM
#11
You are assuming that there is only one reasonable answer. If you actually look at the numbers and do a little bit of thinking and learning, you might be able to learn more about what the car is telling you by the sound. More knowledge is never a bad thing.
03-06-2012, 05:42 PM
#12
Race Director
This is beyond stupid.
It's simple. There is a right way and a wrong way. Choose which ever you wish. If you think that taping a spreadsheet to your dashboard is good enough. Go for it. If you decide that you want to do it the right way, there are plenty of folks here with the knowledge to help.
It's simple. There is a right way and a wrong way. Choose which ever you wish. If you think that taping a spreadsheet to your dashboard is good enough. Go for it. If you decide that you want to do it the right way, there are plenty of folks here with the knowledge to help.
03-06-2012, 05:58 PM
#14
Team Owner
Member Since: Feb 2003
Location: Sitting in his Nowhere land Hanover Pa
Posts: 49,066
Received 6,979 Likes
on
4,799 Posts
2015 C2 of Year Finalist
how do people drive manual cars or trucks with no tachs.
03-06-2012, 06:00 PM
#15
03-06-2012, 06:02 PM
#16
Melting Slicks
Member Since: Nov 2005
Location: WAY UPSTATE NY
Posts: 2,736
Likes: 0
Received 0 Likes
on
0 Posts
The OP is not stupid .Red gave a logical answer....Yet you come back implying he is wrong... You are abrasive in you posts ...You don't have all the answers... althouth you pontificate that you you know all....
03-06-2012, 06:05 PM
#17
Race Director
03-06-2012, 06:05 PM
#18
Melting Slicks
Member Since: Nov 2005
Location: WAY UPSTATE NY
Posts: 2,736
Likes: 0
Received 0 Likes
on
0 Posts
03-06-2012, 06:12 PM
#19
Team Owner
Member Since: Aug 2005
Location: Riverside County Southern California
Posts: 34,988
Received 501 Likes
on
342 Posts
Co-winner 2020 C4 of the Year - Modified
2018 Corvette of Year Finalist
2017 C4 of Year
2016 C7 of Year Finalist
St. Jude Donor '09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
This is beyond stupid.
It's simple. There is a right way and a wrong way. Choose which ever you wish. If you think that taping a spreadsheet to your dashboard is good enough. Go for it. If you decide that you want to do it the right way, there are plenty of folks here with the knowledge to help.
It's simple. There is a right way and a wrong way. Choose which ever you wish. If you think that taping a spreadsheet to your dashboard is good enough. Go for it. If you decide that you want to do it the right way, there are plenty of folks here with the knowledge to help.
ts not safe to tape a spreadsheet to the dash board. Now you dont know the speed and voltage.
