Subaru Enthusiasts Car Club of the Sierras - View Single Post

Dean · 2006-09-13, 02:30 PM

There is actual math and statistics behind the Street Tire modifier, unlike the PAX factors themselves IMHO.

First, .968 = 2 seconds on a 60 seccond course, no mater the class. 60 x .968 = 58.

The two secconds was originally determined by John Evans based on his own imperical testing.

After listening to whining in 2004, to verify it's validity, I took data from the entire '04 National tour and compared times from ST competitiors and their corresponding SP classes.

The bottom line is that the difference is actually closer to 2.5 seconds per 60 second run ST vs. SP.

I presented this to the club for the 2005 sups to support the .968 number, and there was little if any comment/criticism. The whining only rears it's head when someone is getting their arse kicked by a Street Tire car.

You could redo the math on '05 data, but it would be harder as SP now allows boost mods for forced induction engines that ST doesn't, so you wold have to pick your cars/classes much more carefully than I did.

If anyone cares, I could probably dig up the excel spreadsheet I did the calculatiosn with.

2006-09-13, 02:30 PM	#8
Dean Señor Cheap Bastarde Real Name: Dean Join Date: May 2003 Location: $99 Tire Store Posts: 9,294 Car: $.04 STI Class: Fast,Cheap & Reliable=STI Deal, did somebody say Deal? Oh, Dean, yeah that's me.	There is actual math and statistics behind the Street Tire modifier, unlike the PAX factors themselves IMHO. First, .968 = 2 seconds on a 60 seccond course, no mater the class. 60 x .968 = 58. The two secconds was originally determined by John Evans based on his own imperical testing. After listening to whining in 2004, to verify it's validity, I took data from the entire '04 National tour and compared times from ST competitiors and their corresponding SP classes. The bottom line is that the difference is actually closer to 2.5 seconds per 60 second run ST vs. SP. I presented this to the club for the 2005 sups to support the .968 number, and there was little if any comment/criticism. The whining only rears it's head when someone is getting their arse kicked by a Street Tire car. You could redo the math on '05 data, but it would be harder as SP now allows boost mods for forced induction engines that ST doesn't, so you wold have to pick your cars/classes much more carefully than I did. If anyone cares, I could probably dig up the excel spreadsheet I did the calculatiosn with. __________________ I am a Commodore PET --- Now get off my lawn you kids...