5.3 on 15psi 718 hp
#41
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What size of down pipe? 3" is good for about 650ish, 3.5" is good for about 950ish. Just something I realized when gong through a ton of mags and researching the subject. The more air in, the more air out and after the turbine it is not pressurized so, the bigger the down pipe the better, also help with spool.
#42
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
What size of down pipe? 3" is good for about 650ish, 3.5" is good for about 950ish. Just something I realized when gong through a ton of mags and researching the subject. The more air in, the more air out and after the turbine it is not pressurized so, the bigger the down pipe the better, also help with spool.