No its not bad to do a boosted launch. It will just cause alot of heat buildup quick so you don't want to do it for too long. I would take it up to about 10 psi. Boosed launch is about building up boost and your torque converter stall speed will determine the RPM
do this on a straight road.. and use 4 wheel drive.. other wise you'll spin the tires for the first 75-100 feet.. my IDP race tune spins the tires way to easy at 3/4 throttle from a stop w/o a boosted launch.. let alone full throttle.. ! but you shouldn't have any trouble beating him w/ a 250..
You should get him with the 250 tune no problem. The 275 tune will just make him feel really small. The 275 tune is a 13.1-13.4 tune in the 1/4 mile. The 250 tune is a 13.4-13.7 tune in the 1/4 mile. Do those trucks even run 13's in the 1/4 mile?
I beat a 1500 with a hemi with a stock sct tune. And I've smoked other hemis with my innovative street and race tunes! I've gotten them from a stop with a boosted launch and from a 30 mph roll. You'll have no problem with the 250!
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