Lol! 
what tires should i dyno with?
street tires if you want to see the bigger numbers.
by the way i redyno'd my car and i know you were interested in a catback to 3" duals comparison. previous i made 429rwhp w/ a magnaflow catback now i added 4:10's in the stock rear, bfg drag radials and a dual 3" with magnaflow 4x9 mufflers with tailpipes out the back and dyno'd 416rwhp. the thing is..is that when i dyno'd 429 my A/F ratio was 13.0 flat now its 11.8!! probably from the exhaust switch. i will be getting it retuned.
by the way i redyno'd my car and i know you were interested in a catback to 3" duals comparison. previous i made 429rwhp w/ a magnaflow catback now i added 4:10's in the stock rear, bfg drag radials and a dual 3" with magnaflow 4x9 mufflers with tailpipes out the back and dyno'd 416rwhp. the thing is..is that when i dyno'd 429 my A/F ratio was 13.0 flat now its 11.8!! probably from the exhaust switch. i will be getting it retuned.
Originally Posted by 02SOMWS6
slicks or street tires? I'm thinking street for less rolling resistance
I saw some people using 45-50psi of air in the street tires to get higher numbers. There are alot of tricks to get higher numbers on the dyno.
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Originally Posted by koolrayz
I dyno with my slicks. dont you guy's spin on the dyno with street tires? I do. I want to do my tuning with my track shoes on 
Originally Posted by thechef
we have seen NOS cars spin on the dyno usually and a few Supras with alot of boost
Did they strap them good, or maybe the rollers were smoothen because they are old. The Twin Turbo Viper was making 900rwtq around 3500RPM and it didnt spin the rollers. It did start spinning the rollers when it made over 1200rwtq.
