when you hold the brake when u spool up with an auto to build boost, does it hurt the tranny any?

 

Sure, it may cause slipage.

 

if you do it very long, you could burn it up. when we did a tune on a gasser we would do a "stall" test to check the rpms and the condition of the trans/converter. you cannot exceed 250 degrees trans oil temp...... doing a stall raises temps FAST!

 

thanks for the info, how long is to long?

 

Get a trans temp gauge hooked up in the "HOT" line and then you will know....prob no more than 5-10 sec.....

 

watch your tranny gauge

 

I wouldn't be worried about clutches. I'd be worried about a broken shaft.

 

u dont think it will hurt the clutches? i know a lot of auto truck do it before a pull to build boost i thought. or like right before you do a big burnout. i just dont want to ruin my tranny.

 

whats all done to your tranny

 

it been redone by BD transmisions, im not sure what all is done to it. but i do know im real herd on that truck and i havent had no tranny problems yet. the tranny also has a BD pressure lock on it too. it just doesnt have a valve body yet. thats what i want to do next.

 

I have a fast responding gauge in the hot line and mine doesn't seem to get any hotter if I stage for 15 seconds or if I stage for 5. It will see around 200* at the end of a 1/4 mile run in 90*+ temps.

I ALWAYS stage last at the track so I don't have to hold boost while the other guy stages. You see videos of high HP guys staging for 10-20 seconds and they don't seem to be doing any immediate damage.

 

i would say if you get a good valve body and converter which you might already have the converter im not really firmiliar with your tranny you would be fine with boosted launch's

 

thanks guys, all this info really helps. this is my first automatic so im not sure about what they can take. i have had a 6 and a 5 speed before and they were tuff, but i did break shafts. how many degree temp gauge should i get? i guess i can look online and see what they sell.