stock 87 grand national

[kandc7]

hi buick lovers. does anybody know what a stock gn from the factory boost was set at? i know the gnx was set to 16psi but what was the gn set at? thanks!

 

[SIXBANGR]

mine was at 14

 

[kandc7]

thanks for the info! so at 14psi it puts out 245hp. right? so if u go up a pound of boost how much hp do u get?

 

[chadly]

I’ve always heard 1 lbs of boost = 10-15 hp. But before you even consider turning up the boost what mods do you have and what are you going to use to monitor knock?

 

[turbojd]

hi buick lovers. does anybody know what a stock gn from the factory boost was set at? i know the gnx was set to 16psi but what was the gn set at? thanks!

I'm pretty sure it would spike to 14 lbs. then cut back to 10-12 lbs. of boost from what I remember.