Formula to convert 660 to 1320

[Jeff Niceswanger]

Originally Posted by Alan Roehrich

An 1/8 mile to 1/4 mile formula isn't really going to work well for most Stock/Super Stock cars simply because the vast majority of them are handicapped in one way or another, and often do not run as well on the "back half".

Back when Gulius was building ours (L-98), he wanted the RPM @ 1000 foot. Not the finish line. 8800 etc....Don't want to be specific, but he didn't care what it was for the 1000-1320. Said the 0-1000 is what is important. That likely don't jive with most of those calculators.

[Billy Nees]

Originally Posted by Jeff Niceswanger

Back when Gulius was building ours (L-98), he wanted the RPM @ 1000 foot. Not the finish line. 8800 etc....Don't want to be specific, but he didn't care what it was for the 1000-1320. Said the 0-1000 is what is important. That likely don't jive with most of those calculators.

and thus the term "aired-out".

[Mike Schwartz]

I determined a conversion factor of 1.57, based on the actual times of the low-powered, street-driven cars I raced for most of my career. I find bumping it down to 1.56 or 1.55 for more powerful race-only cars gets decent results. It's easy to figure it out from time slips.