.justin. Posted May 17, 2006 Report Share Posted May 17, 2006 Hi- Just two quick questions that I haven't been able to find searching through the forum. First, what size belt should I be using with the 2.9" pulley? Second, for those CA and other low-altitude 91 Octane areas, have you safely been able to run this much boost without running into a lot of knock issues? Thanks Justin Quote Link to comment Share on other sites More sharing options...
pnblwzd Posted May 17, 2006 Report Share Posted May 17, 2006 I would have to look to see the belt size, but the 2.9 is do-able on CA gas. However, the mixture of my original mail order tune needed to be richened up in the upper RPMs to prevent k/r. Quote Link to comment Share on other sites More sharing options...
TimB Posted May 17, 2006 Report Share Posted May 17, 2006 I put on a 110.5 in belt Quote Link to comment Share on other sites More sharing options...
Krambo Posted May 17, 2006 Report Share Posted May 17, 2006 I put on a 110.5 in belt Quote Link to comment Share on other sites More sharing options...
sandmanss Posted May 18, 2006 Report Share Posted May 18, 2006 I am jumping into the same boat. I will be installing a radix with a 3.0 pulley and the gas in AZ is probably the same crappy 91 you guys have in CA. Quote Link to comment Share on other sites More sharing options...
.justin. Posted May 18, 2006 Author Report Share Posted May 18, 2006 I am jumping into the same boat. I will be installing a radix with a 3.0 pulley and the gas in AZ is probably the same crappy 91 you guys have in CA. <{POST_SNAPBACK}> My advice is once you find a good gas station or brand, stick with it. I've picked up 3 crappy tanks of gas in the past month and a half or so... Quote Link to comment Share on other sites More sharing options...
rgp6373 Posted May 18, 2006 Report Share Posted May 18, 2006 i have to run 91 octane so i use lucas octane boost and have no issues and i use the same belt size that came with my radix with the 2.9 pulley and no problems Quote Link to comment Share on other sites More sharing options...
Holty Posted May 19, 2006 Report Share Posted May 19, 2006 i use a 110.5 inch Gatorback belt found here: http://store.summitracing.com/partdetail.a...15&autoview=sku Quote Link to comment Share on other sites More sharing options...
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