SC Pulley Help

[BSouders80]

I have the Livernois 6.6L, running Whipple with 2.75" pulley. Crank pulley is ATI 12% OD. 8 rib setup

There has been a problem with this setup. With a quick hit of the acceleration, it's about 50/50 on if the SC belt will fly off.

Livernois says that the problem is caused by OD crank pulley causing a bad angle of the belt.

Livernois has a fix for this. Basically their fix is switch back to OE ATI crank pulley, crank seal kit, 125.3" 8 rib belt, and one SC idler pulley.

My beef with this - - I'd lose boost/power. Livernois says the power decrease is not noticeable. I spent big $$ to be able to run E85 and have as much boost as I could to optimize the power.

I bought the livernois kit and have it sittingng here in my office. They sent 3 of the 125.3" belts. That's odd. Unless they think there's a reason I'd need 3 belts.......

Griptech has a wide range of whipple pullies. I am currently on 2.75". The sizes offered are 2.75", 2.70", 2.625", 2.60", 2.55" and 2.50"

I'm having an A-Pilloar 3 pod gauge setup. Should be done tomorrow. I have boost gauge, trans temp and AFR gauges.

My plan is to make some pulls after the gauges are installed and see exactly where I'm at on boost. Then have the Livernois kit installed.

Here is where I need help. What size pulley should I start with? I've tried calculators and not really landed on a sure decision. The pulley is right around $180/EA. I was about to buy the 2.60", but thought I would get some input on here.

TIA

Brian

 

[MTF]

Have you tried a laser and tried to hit the first rib on all pulleys to see what is out of alignment?

You must be at crazy boost levels with your setup, nice.
I had the OEM crank pulley and 3.375 SC pulley and I was doing 10.5 to 11 lbs. of boost.

 

[BSouders80]

I have talked with another guy who has the same setup from Livernois (minus E85 mods). He went back and forth with Livernois, sent his truck to them more than once. Livernois said it had to be an alignment issue with him. Livernois confirmed no alignment issue with pullies and he also had it checked on his own. Livernois came up with the belt angle caused by the OD pulley is what the problem was. Livernois put this package together for him and he's had good luck. Said his belt has only flew off once related to some "dumb" driving on his part. He also said the power loss isn't noticeable.

I'm not okay with losing boost. I paid for IDX 1300 injectors and a fuel pump to flow that E85. I don't want to lose potential.