The Build

Current effective hp is somewhere around 229bhp (195 whp measured, 18% over stock) less some unknown wing drag. This gives me 9.5 whp/lb (almost 30% improved vs stock), and 4 wheels @275 section with (about 10.2" tread width each) gives 45 lbs for every inch of race tire to handle (vs 59lbs/inch stock sport tire, 33% improvement vs stock). Pure guess work comparing to other wings online puts downforce at about 120-180 lbs @60mph or 7-10% of vehicle weight. vs virtually no down force in stock configuration.

Thus in terms of critical physical performance measures vs stock :
  • ~30% better power/weight
  • 33% better tire/weight
  • A7 vs A048 tire rubber compound.
  • possibly 7-10% more normal force at contact with road?
Plus suspension & brake improvements...

Weight below is typical start of event weight. At the end of the 2018 NJ Pro Solo the car weighed in at 1826 vs estimated 1841 starting weight, but was fuel starving badly last 2 runs on left side. The car so far has never starved at Devens since the fuel tank upgrade. Devens has lower grip levels. Therefore the lowest usable weight is probbly 12lbs under typical starting weight on high grip surfaces and 15 lbs. under on lower grip surfaces.

Dyno plots with stock plot from the web super imposed (fuzzy blue is stock):

A very similar plot without a super-trap installed yeilded 195 peak hp.

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