1-2 Shift Issues After Converter
Thread Starter
Teching In
Joined: Feb 2010
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From: Ft Myers, FL
1-2 Shift Issues After Converter I have a 2000 C5 Corvette with a stock 4L60 and an FTI 3600 converter. Prior to the converter installation, my transmission would make the 1-2 shift at WOT no problem. Ever since the converter, the converter will hit the limiter at ~6600RPM for about 0.5 seconds before it shifts into 2nd. I can get it to shift into 2nd if I manually go from 1 to 2 at about 5000 RPM, but it doesn't go into 2nd until ~6200 RPM.
It shifted fine before the converter. When we put the converter in, we also put in a 3.42 rear differential out of a Z06 and upped the line pressure to 99%. The shift points are roughly the same, but we tried plenty of combinations to get it to shift properly to no avail.
Any ideas or suggestions are greatly appreciated!
It shifted fine before the converter. When we put the converter in, we also put in a 3.42 rear differential out of a Z06 and upped the line pressure to 99%. The shift points are roughly the same, but we tried plenty of combinations to get it to shift properly to no avail.
Any ideas or suggestions are greatly appreciated!
This is common because the car goes through the rpm range so fast after the converter is installed. If you have a tuner raise the limiter by 200-300 rpm it will be fine. Mine did the same thing after installing.
not sure about changing the line pressure ?
just my .02' Johnny
Thread Starter
Teching In
Joined: Feb 2010
Posts: 24
Likes: 0
From: Ft Myers, FL
Appreciate the help. Do you think it could be an issue inside the transmission? It holds the power fine and shifts 2-3 perfectly every time. And it launches hard as hell for what it is (1.77 60' all night in my slow car lol).
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Verdad Gallardo It is not a problem inside the transmission you simply need to tune the car to shift at a lower rpm so that it has a chance to shift before it bounces off the limiter or raise the rev limiter. My car drove fine with stock cam and shifting at 6600. I did not know how to fix it so I brought my car to one of the sponsors shops on this site and that was how he said it is fixed and it worked. By simply raising the limiter and not changing the shift points the only shift that it will make slightly higher is the 1-2 and that is just because it has trouble making the shift at the right point because of how fast the car goes through the rpm range with the smaller converter.
Thread Starter
Teching In
Joined: Feb 2010
Posts: 24
Likes: 0
From: Ft Myers, FL
It is not a problem inside the transmission you simply need to tune the car to shift at a lower rpm so that it has a chance to shift before it bounces off the limiter or raise the rev limiter. My car drove fine with stock cam and shifting at 6600. I did not know how to fix it so I brought my car to one of the sponsors shops on this site and that was how he said it is fixed and it worked. By simply raising the limiter and not changing the shift points the only shift that it will make slightly higher is the 1-2 and that is just because it has trouble making the shift at the right point because of how fast the car goes through the rpm range with the smaller converter.
I lowered my shift point on the 2-3 shift and raised the limiter by 100. Shifts fine now after the converter install. I am sure your trans is fine. Make sure your tire height and rear gear is correct in your tune as well
Thread Starter
Teching In
Joined: Feb 2010
Posts: 24
Likes: 0
From: Ft Myers, FL
For reference, here's a video of the car at the track after the converter. I manually shifted both times and the 1-2 sounds slower than the 2-3.
http://www.youtube.com/watch?v=2iQKwWfHVgQ
