According to SOS, for the AP1 Comptech NOVI 1000. The smallest pulley you could use is a 3.4". Just wondering if there are AP1 owners out there using anything smaller? If so, how long?

 

I use a 3.0 pulley and boost 9.5 to 10.5 psi. I have a fmic setup.

 

For the Novi1000 that is incorrect. SOS I’m afraid has lost touch with their pulley sizes for some reason. I’ve run a 3.2" for quite a wile now. I'm actually moving to the 3" currently. The Novi1000 max blower speed of 55k gets hit with the 3" sos pulley at 8500rpm. This is the most consistent information I have learned. Maybe some others can chime in and confirm this.

3.4" only yields 11-11.5psi at 9k rpm in my experience - with A/C

 

I am about to pull the trigger on a 3.0" and go standalone..I'm getting to much rich spots on 25~40% throttle.

 

Put the 3" on this eve. Nice improvement from the 3.2". Put me back in the seat more then I was anticipating

 

yeah the blower can support a smaller pulley. the only issue you would run into is that with a smaller pulley there is less grip surface and it is much easier for the belt to slip. You would probably want to get a special one made if going lower than 3.2. One that grips better.

 

I just got a 3.4 inch pulley. I figure it would be the perfect balance of power, reliability and no-slip on my f20c 2001 s2000. Should boost to 10psi max

 

I just got a 3.4 inch pulley. I figure it would be the perfect balance of power, reliability and no-slip on my f20c 2001 s2000. Should boost to 10psi max

 

Made 15psi at 9k in 3rd gear with the 3" sos pulley. Only made 13.5psi in second gear, so clearly getting a bit of belt slip. Belt is pretty snug last I checked, but it probably stretched some again so going to see if I can snug up a bit more and get the full psi in 2nd gear. 1st gear is a lost cause, no matter what pulley I run other then the sock size, spool up is just too fast to get full grip on the pulley.

Cutting some cross section grooves in the pulley ribs would be easy to do with a good dremel tool. I might just do that if it comes to it. Screw Richard Racing

 

If your running an Aftercooler you will make closer to 11-11.5psi at 9k rpm with that 3.4"