Formula to convert 660 to 1320

Mike Schwartz · 09-21-2025, 11:14 PM

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.

HP HUNTER · Today, 10:27 AM

Low 10s stocker type automatic car:
6.29 x 1.585 = 9.97

09-21-2025, 11:14 PM	#1
Mike Schwartz Senior Member Join Date: Feb 2006 Location: Maryland USA Posts: 538 Likes: 143 Liked 252 Times in 91 Posts	Re: Formula to convert 660 to 1320 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.

Today, 10:27 AM	#2
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 657 Likes: 86 Liked 373 Times in 129 Posts	Re: Formula to convert 660 to 1320 Low 10s stocker type automatic car: 6.29 x 1.585 = 9.97

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