Yes, indeed, the results were good. Eye-popping, even. I was there. A 4 second improvement with the wings v. no wings. The stopwatch conclusively proves that on Richard's car your aero produces substantial downforce and improves lap time by a bunch. And they look good, to boot.
But, and it's no small but, Richard's car is upgraded to ~350 whp from the stock SRA's power of a claimed 200. That makes Richard's car 75% more powerful than stock and what your aero will do for a car with much less power than Richard's is still uncertain.
Richard didn't have data so although we know that overall the aero improved things hugely, we don't know any particulars such as what it cost him in top speed. SRA's in stock trim are severely aero and gear limited. Richard says that they top out at 126 mph in 5th gear and acceleration at much over 100 mph is somewhat leisurely. Top speed actually drops in 6th gear, he says. Therefore, drag is much more of a concern for stock SRAs than it is for Richard and at some point would be counterproductive.
I don't know the answer as to what either of your kits would do for the much lesser powered car that is the stock SRA. I do know a few things, though:
- Improving lap time by 1 second can easily cost more than $2500 so $10k for a 4 second improvement is likely a reasonable deal. Perhaps a steal.
- $10k is for most of us a huge amount of money.
- Even if folks are able to pay the $10k, most are willing to do so only if they know how the parts are likely to affect their car.
I think that stock SRA owners still don't know much more than before about what your aero will do for a stock SRA, though on short, fussy, relatively low speed courses where drag and SRA gearing is less of an issue, my guess is that your aero would yield considerable improvement. I'm told that you do a lot of Miata work, aero and otherwise, so you likely know more about aero on lower HP cars than most. What do you think are the differences between your aero on a 350 whp car v. a 200 whp car?
The bottom line for stock SRA owners remains: unless spending $10k is no big deal even if what it buys doesn't help much or at all, then not enough is known about your aero package to just write the check and hope for the best. But, it sure is tempting.
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