Well monday I am going in for a tune. The trucks running a stock lq9 longblock, 232/234 .595/.598 112lsa (TV2) cam, 1 3/4 longtubes, NNBS intake w/ 87mm TB. Right now the d1 has a 4.25 pulley on it, I was shooting for 8psi, but looks like thats not going to happen. I have a 3.70 pulley laying around that I can throw on there. What kind of boost would I expect out of that pulley?

Also, I have a k061115 on there right now, which fits but the tensioner is maxed out. If i ran the 3.70, what length belt would that require. In my mind, that pulley is .55 smaller, So i would assume getting a belt that .5" shorter should be close right?

 

K061110 Sound about right? the 111.5" is maxing out the tensioner as is, so with it being roughly .5" shorter that should put me in the ballpark?