Once you install a high stall converter do you need to tune it? IF you do, what really needs to be done?

 

Not really. The only thing I like to do for cars with a converter is - in the lock up tables for 3rd and 4th, I set the first two cells (0% & 6%) to 256. This keeps the car from trying to lock up when coasting to help prevent the car from jerking from idle rpms to cruise rpms.

 

Yes, in most cases you will get false misfires and if your running air flow is off, you can and most likely will have problems with hunting for idle.

 

I don't understand what you are talking about airflow. Why would I have misfires and idle problems from a stall?

 

It's a pretty big change in rotating mass (the aftermarket stall is much lighter) and can throw off the sensor for misfires.

Might need to do some tuning to optimize for shift points, but the car should run fine without a tune, but you'll get a little more out of the car with one.

 

Exactly, the idle stabilizing properties of the heavier stock converter can mask some idle air flow problems that you may already have... in my case, I had to idle tune all over again due to idle hunting after the install.

Oh, and when your car is sensing misfires the converter won't lock... I found that to be a problem, even with my 3000 stall. It's easy to tune out, though.