Sorry to be a newbie posting a bunch of questions, but I've got another one. Kenne Bell is on, don't think I have any vacuum leaks. But, when I drive I can only get the boost gauge up to around 4 psi. If I'm sitting in park and gun it, I can make her fly right up to 6+.

By the way, the truck flies, maybe I've just got a kink in the hose? The gauge is just one of those crappy KB ones. Couldn't find a kink, but I've got it shoved through the firewall with all the other wires and stuff, coming out right above the parking brake. If it's pinched, though, would it still go up to 6 psi in park? Could I have a hidden vacuum leak? I'm not sure where to start on this. What's the best way to check for a vacuum leak?

Any ideas would be highly appreciated.

 

Boost is load sensitive

 

So I may have a leak, then?

 

No. That is how it is.

 

Oh, so there's nothing wrong, that's just what it'll show while driving given the weight of my truck?

 

But wouldn't it be the opposite? My boost is higher when I'm in gear than when I'm revving in neutral.

 

Will someone please clarify? Is it normal for me to be able to get boost up to 6 psi (which is the maximum for my pulley size) while in park, but the boost only go up to ~4 while driving?

 

my buddy had a f150 and this is prob. irrelivent but his would push almost 8lbs of boost with the stock pulley and we put the next size smaller down pulley on it the truck would boost up to almost 15. seen it with my own eyes while driving it and im not bsing. he also had lots of problems with his kit also. it blew the stock intake apart and it took them forever to get it put on. he also sent it back for it blowing oil out of the top of the blower but i believe they fixed it with a catch can

 

I bet your belt is slipping. It isn't under as much load when reving it up in park as it is when you are actually putting it under a load. My radix didn't start pushing full boost until the belt broke in which took about 2k miles. It was 6lbs when I first put it on and a couple of weeks later it was pushing 7.5.

 

No sign of dust on the pulleys, they're pretty tight. Maybe too tight? Is that possible?