Feuerrader

Hey all,

Running a SOS novi1200 with 3.2" pulley on an AP1. Did some test pulls after install and saw a max of only 10-11 psi at about 7900 rpm. (Haven't hit the dyno yet). Pulley was notched prior to install in two places in an attempt to prevent slip. Belt is very snug. I was expecting more psi with this setup of course. Is this likely slipping? What are your guys thoughts on coating the pulley with a rough coating to prevent slip? (EDIT) image link broke in original post. See below:
http://imgur.com/a/3Bl0z

The guys that do this are http://www.carbiniteracing.com/pulley.html

Any input on alternate solutions appreciated.

Thanks.

s2k manic

I am running effectively a 3.2'' blower pulley and I get 17.5 psi in 100 degree weather and 18.5-19 psi in 50 degree air. this is with the novi 1200 with my own custom built air to air setup very efficiently. no kit on the market can compare. if your running the air water you should see around the same boost as me or a bit more. check your belt I added an ilder pulley on the driver side under the blower pulley for more belt wrap along with a 6.75 crank pulley and 4'' blower pulley and 3.8 tensioner pulley with no belt slip.

Feuerrader

Hey thanks for the input. I am on the air-water setup. I would much rather not resort to a new crank pulley unless I can't find any other solutions. The added idler might be something I'll give a try. I think I'll try a custom blower pulley first though. How much work did it take to add the idler?

Does anyone know the shaft size on the novi1200? I might need to call Paxton/SOS for that info.

Anyone recommend against trying the coating? I'm concerned with how much it might eat into the belt over time.

Thanks

amdaman

The belt will be slipping.

Like maniac I was seeing 18+ PSI with my 6.5/3.6" pulley combo on a FMIC. The belt would slip after a few runs though at 8000+RPM either from a stretching belt or lack of tensioning as it warms up. I was using the CT tensioner which isn't as goof as the SOS one.

The carbonite coating will greatly reduce the life of your belt.

The solutions you can try:

- Extra idler as suggested
- Notching the blower pulley
- Increasing the crank and the blower pulley size
- 8/10 rib setups from ASP.

I've just gone down the 8 rib route and it was quite costly. If you go the 10 rib you run into problems with the steering rack.

If your crank pulley is bigger than 6.75" you foul the waterpump and will need a custom waterpump by ASP too. 8-rib will also need 4x 7mm spacers and a wider idler (Dayco 89016).

I've got the 7.5" / 4.3" 8-rib combo now and I can still get the belt on and off without taking pulleys off. ASP will also lighten the crank pulley for you as it's massive. Awaiting dyno tuning.

Good luck!