Does anyone know the setup for grass drag racing? How do they keep the slides cool? I have heard of spraying anti-freeze on the slides.

Do they make teflon slides or only UHMW? I have graphite slides in my Phazer and they still seem to drag my rpm's down. I have the track at nearly the loosest setting, so I don't think the track is too tight.

Can the clips in the track get scored and cause drag?

for grass the hyfax is removed. just add a couple of sets of stock idler wheels with the stock mounting pads in the (usually) two spots of hardest contact between the clips and the rail. you may be able to get away without adding any wheels especially if you get the sled sittin really low.