Just to clear things up a little, I want to make sure I understand this right. I have heard the term too loose or too tight, or you make enough power to "blow thru this one". I think most of us are beyond the days of picking a B&M converter based advertised stall for our 350 79 camaro with a VS carb and powerball cam. We are in a time where TQ and HP numbers are far greater than our fathers would ever imagine in a street driven car or truck. We actually make enough power to twist up a TH400 or brake a 9" if not built correctly.

With this all in mind, i have lost sleep at night worring about my torque converters performance - heart disease or cancer even takes a back door to my new phobia. I now have a collection of converters from Vig 2800 to a yank pt4000 and if I listen to some folks, none of them will work for me. Here is what I need... I am going to give an example below. If I am correct good deal. If I am not please correct me.

Lets say I have a converter that flashes to 3800RPM with my 450rwtq 3300lb car. I shift at 7000RPM and I loose about 300 rpm between shifts. Lets say I shoot the same combo with a 200shot and torque jumps 160lb across the powerband. Now the RPM jumps to 5000 right off and when I shift at 7000 like normal I get a drop of about 150 rpm. Last my 300 shot takes me to 6800 and I never feel the shift and the shift light stays on the entire run.

Which is blow thru and shift extension?

 

you want a rpm drop of about 1000 or so for best performance, this is about the standered for a nitrous car. less extension it is loose, more extension it is tight.

The only way you will get the right converter is have a dealer build one for you based on your wants, then give them data on it and they can prolly make it better the second time around.

 

I would have a nitrous stall built for your car. You cant buy a stall off the shelf and it work a 100%. With nitrous you my have to slowy bring in the nitrous if you car is blowing thru. This happen to me on my old set up

 

Thanks guys. My turbo car takes one type of converter and my NA/Nos car takes another.

I have talked to Greg at FTI about a PG trans and converter combo, but I need to get some of this stuff out of my first.