What do i need....?

[Black03COBRA]

I want to install a lower 6 pound pulley in addition to my 2.77 upper. Do i need a bigger upper? and what size alt. pulley, if i need one? also, what size belt? i also want to add that i have the billet flow idler pulleys installed as of now with the stock belt .

thanks

 

[sambandit]

You don't "need" the alt. pulley. You'll just shorten the life span, I've got a 3.5 sitting here but have not installed it. Belt you'll need with a 100mm idler is probably a gates 080774. It's 77 and 7/8 inches. Ive got a 2.93 with the 6 lb lower and use 080780. 78 and 5/8 inches. You'll really be overspinning the blower with the 2.7 upper, I'd suggest a 2.9 or even a 3.0 up top with the 6lb lower.