Competition Boost of the line

[CLAYTON]

How much boost is it safe for me to build up before I take off the line in 4hi? Trany is stock and I don't want to break any shafts or ujoints or anything.

 

[Cummins4Life]

10psi

 

[CLAYTON]

So 10psi before I snap something? Sounds good to me... what do you leave the line at?

 

[mcoleman]

Do a search on what Rhonda leaves the line at. I think it's around 24 pounds but I'm not positive. I'm going to give 20+ a shot once I get hardened input and output shafts. Should be fun.

 

[Snow man]

Most stock shafts will take 15psi easy,but you are taking a chance. I used to launch at 20PSI all thei tmwith my stock output shaft,no problems. I broke it at 28psi opps!. Now with DTT/Opie billet output shaft,i can launch at 30 easliy.

 

[Cummins4Life]

Originally posted by CLAYTON

So 10psi before I snap something? Sounds good to me... what do you leave the line at?

10-15. Has spiked to 20 a few times on accident. Billet input stock output.

 

[CLAYTON]

Thanks. . I'll give it a try. . is it pretty hard on the u-joints?

 

[Snow man]

Clayton,your drag racing,thats the bottom line. Drag racing anything is hard on parts. IMO if your trucks stock and your not abusive,you can drag race for a LONG time with no problems. As HP goes up,reliablity goes down,and so does life of parts,especially those behind the Cummins,and critical seal between the block/head, LOL. Dont ask me how I know . I tell my buddies who see me race my truck this,if you cant afford to pay,dont play.

BTW ive never lost a U joint, i did wear out the original rear joint ot the D70,but it happeend after 75K,and was dry,i had a vibration that got worse under power,went away on coast. Ive hopped my truck pretty bad off the line,had all 4 smoking,and hopping,I thought id have broke more by now,esp with plowing. IMO if you havea STD you are much more likey to damage the u joints,driveshafts and rear ends, due the shock loading/unloading,and lack of a cushioning effect the auto gives in fluid coupling.

 

[CLAYTON]

Thanks Snow Man. . I appreciate the input. . I'm still green with all this diesel and horse power stuff, but I'm lovin every minute of it.