I'd go with a cogged setup. Problems running them on the street? What have they been using for timing belts for the last 30 years?
Another plus for the cogs.............the belt is not nearly as tight so there is far less stress on the front of the crank. If you go to the cogged set up, you might want to use a blower brace--it goes from the head unit to the crank and it really helps support the blower. Bob Kurgan (Kurgan Motorsports) makes (IMO) the best one out there. Vortech also makes one but it is not a sturdy.
6 rib belt. I'm going to do some research on running COG's on the street. It seems like the best solution. I was only able to find Cog setups for the other manufacturer. I will call them tomorrow.
To be honest, a 10 rib set up should work fine on the street...............we were launching off the trans brake at 5500 and shifting at 7500 so we had a lot of trouble with belt slippage even with a 10 rib--cogs were the answer for us but a 10 rib will be fine for you. Still, I'd make the call to Vortech to be sure.
why did my 6 rib novi not slip at 12 lbs boost at 6800 rpm?
With only making 12 lb at 6800 you must of had a fairly large blower pulley or, a larger crank puley--guessing a 3.10 or even a 3.33 (blower). With either one of those you had a lot of belt "wrappage" on that pulley--hence very little, if any slippage. Generally, the smaller pulley you go to, the more slip you get. You can go to 8 and 10 ribs to help it as you go to the smaller pulley but eventually all of us go to a cog--if class rules allow.
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