i never ran mine with the stock tensioner went striat to a HD tensioner

i made 9psi on a 3.85 pulley with my 6 rib setup on my heads cam LQ4

hopefully you don't have belt issues like i did

 

lq9, Tv2 cam (232/234 .600/600 112lsa), longtubes, nnbs intake w/87mm tb. I talked with procharger, and was told 4.25 would get me 8psi? I also have a 3.70 that came with the kit when I bought it used.

Also, when you guys say HD, which are you referring too. First thing that comes to mind is like 2500 HD truck tensioner lol

 

Just realized I follow you on IG..

 

I dont see that pulley making 8 PSI if you still have the stock balancer. Your cam will bleed off too much boost. It has 9* of overlap

Frankly the 3.7 with the 6 rib will probably slip, but I'd probably run it. Depending on whether and where you shift you will be in the 10PSI ball park. Definitely get the HD tensioner. Kurt can get you a part number.

 

Currently shifting about 6200. And what are you thinking with the 4.25, maybe 6/7psi? Or maybe find a 4.00 and be right in the middle? And how do I get ahold of curt?

 

lol im KURT

you need a magnacharger HD tensioner look around i bought mine used on here they pop up every so often

i don't see you making 9* or 10* with a 4.25 3.70 will probably get belt slip like rob said smallest i ever went with my 6 rib was 3.85 and was shifting at 6200 iirc

 

Ohh.. Haha, well I originally was only shooting for 6/7 psi. I'm only looking to break the 500s, and maybe dive into the 11s. The truck runs 12.55 @ 109 right now, NA, so I'm hoping a few psi will make it happen. I'm going to run the 4.25 and see what happens

 

Odd how a 3.7 will have slip but my old 3.2 didnt slip

 

Maybe it wont... I dont know.

You also had a P1. That took a lot less drive power to spin. Apples to Oranges.

 

Units are similar, difference is size of belt and tension applied...my belt was sized to where i had to walk the belt on the crank pulley