avalanchett

how much boost is safe on a stock 5.3 chevrolet. i have 8 on it is that ok or too much ? can i add more boost?
thanks for help guys ..

charcold-bowtie

iTrader: (10)

theres a lot of factors.... My opinion is around 12ish. With meth. At least daily driven. I could see around 14ish at the track with a good tune.

Mr. Sandog

What I've heard from the people I respect is 10psi max, with a good tune, sustained over time.

nonnieselman

iTrader: (10)

Tune is the major factor. but it depends on how you use the truck.

Parish and that bunch have been punishing the stock 5.3 in the Fairmont for quite some time on 18#? boost but they are running race gas.

Mangled03gmc

iTrader: (95)

You could run 10-12 psi safe.. Like mentioned the more boost you run the more spot on the tune has to be... The tune plays the biggest rule..

stock48

iTrader: (16)

The only true way to tell is keep adding boost until it blows up, then fix it and back it off a little. Or take my approach and build it back stronger, and try to blow it up again

Seriously though every application is different. In a light car, with a loose converter you might get away with 18~20PSI for a while. In a heavy truck 14~16 PSI might be the limit.

The tune, fuel quality, temp, and back PSI are your main factors.

avalanchett

thanks guys i am running 9 psi making 450 to wheels with 14 timing.. so this is saffe?

nonnieselman

iTrader: (10)

What are you calling Back PSI?

avalanchett

back presssure from the exhaust.

nonnieselman

iTrader: (10)

Thats what i thought, had to make sure tho.