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My guess was that SS/FS need about a 4% discount ie a 0.96 multiplier. Dick's data below suggests even that was conservative.

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2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

It is going to be a lot more educated/wild guessing for a few years before the kind of historical data is available to Rick that he has had in the past.

Also, the Evo TnT site was a fairly small smooth asphalt site with a lot of sand off line. Nationals was . . . well you know . . . much different.

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Dick Rasmussen

FS 50 2018 Mustang GT

Thanks for the data Dick. It's unfortunate they didn't retest the Rivals just after finishing the A6 tests, but this is better than nothing of course (especially since it's free to us!). I have a better understanding now of how there is likely a sliding scale of "street tire adjustment multiplier" in the various classes depending on the horsepower (and of course depending on other variables too like RWD, FWD, AWD), and one simple number is clearly not going to be sufficient across the board in any way.

I was thinking in my own case with Rivals. Let's assume I switch to 275/35-18 all around (although I currently have 245/40s). If I compare that to what a few are running on M3s in F-stock, one very competent driver in the St Louis region is using 295/30-18 front and 315/30-18 rear A6s. One almost can't fathom the acceleration grip of an A6 at 315 section width versus a 275 Rival, much less a 245 Rival. Hence that multiplier to equivocate these two setups is really going to depend on pavement/concrete, temperatures, amongst all of the other variables among the various cars in all the classes. This is really a losing proposition to try to come up with some overall "number" that is in any applicable across all cars.

By the way, the E92 M3 almost won F-stock this year at Nationals. It had the fastest time in F-stock on day 2 and was only slightly off the leader's pace on day 1. Perhaps that will spark more interest in the E90/E92 M3 for F-stock competitors so it doesn't continue to be an all-Mustang class.

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Current stable:
2019 BMW M2 Competition slicktop 6MT
2011 BMW M3 sedan slicktop 6MT
2007 BMW 328i wagon (slushbox for now)
1975 CanAm 125MX2

I noticed that too. I might have to continue looking for an E90 M .

_________________
2011/2012 Autox VP
2013/2014.5 President
2013 Top Gun

2015 Fit

22R-EC => 4G63 => D16Y7 + D16Y8 => EJ255 + K24Z2 => K20Z3 + K24Z2 => K24Z2 + M54 => L15B

Were they on East or West on day two? The two courses were very different. East was high speed with a lot of digs. West was pure speed maintenance. (Just to add to your equation.)

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SCCA Solo Triad Award Recipient 2014
SCCA HSL National Champion 2012
SCCA DSL National Champion 2013
SCCA DSL National Champion 2014
NCR National Driver of the Year 2012
THSCC Heel of the Year 2011
Former Club Secretary
http://www.petscompanioninn.com

The 2008 M3 was faster on the East Course. From FP and CM videos it looked like some of the fastest segments required REALLY good handling to be able to use the speed from the digs. It will be interesting to see what happens on Street tires if the M3's are more balanced and/or can put the power down better than the Mustangs.

Video links:

FP video link inside this link: http://www.roadandtrack.com/go/news/vid ... =soc_fcbks

CM video link: http://vimeo.com/74167806

Also, the CM run included a LOT of shifts. Some you can see, most upshifts you can hear. Better shifter than the Porsche

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Dick Rasmussen

FS 50 2018 Mustang GT

I guess I'm all set for 2014. Already bought the Rivals and I can keep using my old magnetics.

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Art McDonald
Premier Amateur #518
2008 Dishman Cup
Pivot Cone Snob

Rodney is a waxer (but in a good way)