The answer is still the same and I can?t figure out what all the different posts are about. The original question was ?will a normally aspirated piston engines vehicle go faster at Bonneville or sea level?. If you look at performance charts of any normally aspirated piston engine aircraft that allows full power operation at sea level you will find the higher you go the slower you go using all available power. These charts are for standardized temperature and pressure at the various altitudes. There is no "crossover point" that I have ever seen. Jet aircraft are a whole different animal and have no relationship to normally aspirated piston engines
?will a normally aspirated piston engines vehicle go faster at Bonneville or sea level?. With almost all cars, it WILL go slower. But, There is a crossover point, and with the previous "most cars", its already been past, and you loose speed as you go up in altitude. Jet engines act like blown piston engines in that the extra forced induction simply changes the slope of the decrease in power vs. altitude that I spoke about b4. That change in slope moves the "crossover point" up.
strictly speaking about the Normally Asperated recip engine in the question, if it were on a dyno, it will lose power as it goes up in Density Altitude.