conv slip and fallback rpm

[FARRIGNO]

does anybody know what the % of slip is a good number?i have 8% now but the car works good, also it falls back 1000-rpm on the shift does this sound about right?

[John_Heard]

Sounds pretty good... What 1st gear are you using?

[sverbus]

How are you measuring the converter slip? I can watch the tach for the amount of RPM fall after shift correct?

Are you using a data logger to figure that out?

thanks

[Marty Chance]

ideal converter slip and fall back rpm ???? (great question) the amount of slip and fall back rpm is going to be different on every motor , remember the number one rule to make your car fast is - MAKE THE MOTOR HAPPY !! there is no short answer to this question . the longer your torque curve is the more you will want it to drop and if you run a p/g you have about 80% split between gears which can make it hard for the motor to recover the shift if it drops too much . Long story short - 900 to 1100 rpm is kinda rule of thumb drop on a p/g car and this may vary also with bracket racing versus heads up . Note less slippage is not always better , if the converter locks up too fast for the power curve of the motor , the motor will not accelerate as fast as it could have. Sorry for the over generalized answers , but i need more specific on your vehicle to answer more accurately , and this post will most likely create a lot more questions , so fire away . Marty Chance

[FARRIGNO]

thanks marty, its a t-400, i measure slip with a formula off of tci site, i can see the fall back rpm off of my playback tach everthing else aside i could not be more happy with my conv. and tranny just wasn't sure of slip and fallbackrpm.

[Marty Chance]

to answer your question 8% and 1000 rpm drop on the shift sound like the converter is very close. Marty