Mike99ACR, im sorry but you raced someone who doesnt know how to drive. A 98 Diablo SV is 530hp stock.
Your probably right about the driver but, the results did not surprise me. I guess it depends what mag. you read and want to believe. Everything I've read said 12.7 et for a 98 Diablo in 1/4 mile test. Thats why I thought the results were pretty accurate with my Viper beating him by a couple cars. Even if I gave the Diablo the benefit of the doubt and ignored what I read and said it can run 12.0. I run under 12.0 with Pilots with 11.79 my best which would still result in 2 cars. AS far as it being the driver that goes for you and anyone else as well. Maybe the Vipers you raced did not have the best drivers in them. I have seen alot of Vipers run 13's. I use to be one of them
Only place you read that a Diablo Sv ran a 12.7 was Road and track which used a private example in its worst roadtest. It is the ONLY magazine that had results like these. Every other magazine (trust me, i have them all) put the car in the 11's . Even Road and track, Car and Driver, and Motor Trend, all got the much heavier 6.0 to run 11.80's - 12.00's. As you stated, you used to run 13's in your Viper, logic runs that an experienced owner of a DIablo could further improve upon these times, just as Viper owners consistently improve upon magazine times. My friend went from running 13's in His 98 Diablo to a best of 11.56 or 11.59 in his stock SV.
On the Supercharged Viper front, again, i believe a 130mph Viper should walk a stock Diablo well. But also keep in mind, just one mod on the Diablo, drops 100 pds of weight, and adds sometimes over 50RWHP, and thats exhaust. Still not enough to beat a supercharged Viper.
I guess the best point of logic is that you have several owners of both Vipers and Diablos here, and all of them tell you the same.