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Missed your fitment question, but it looks like you figured it out. The go-to route is to mount the splitter and sturdy-bois first, then line up the air-dam.
2:21.7xx yesterday in the best session that day and a 2:18.9xx this morning in a much better session. Were you able to test with and without a wing yet? I'm super curious now, especially since NASA Nationals will be at Daytona in 2021.
That was fun! First time at Daytona in my car, so that's my excuse for under-driving on Saturday.
I ran the car without the wing on Saturday and for the first session on Sunday.
It rained for 2 out of the 4 sessions on both days, so I wasn't able to do as much testing as I wanted to.
Saturday fastest time was 2:21.761, leaving a LOT on the table in turns 1 and the bus stop. Winning time that day was 2:18.970 by an Integra driver. I got third.
Sunday fastest time was 2:18.760, good enough for the win and track record (first time for this class at Daytona, so likely to come down). Still left time on the table mainly in turn 1. Car felt very slightly loose in a few of the tight turns on the infield with the air dam (no splitter) and no wing.
I installed the wing set to 0°AOA for the second session and ran 2:20.435, partly due to being held up by traffic, but also from the changed balance causing more push. I had to change my line/style and didn't adapt quickly enough for a strong lap. Sessions were short, so we could only get 4 good laps each time out, It rained in the afternoon and I didn't go out again since I only had Hoosier R7s (and no wiper blades).
Fastest speed was ~140mph without the wing, and ~137.5mp with the wing (from imperfect memory).
I'll follow up with more information once I have the chance to review the videos and TrackMate data,
I figured the weather was guna be a pain this weekend. Glad you guys got some decent sessions though.
In for the data! 2.5mph isn't anything to brush off! It's probably worth not running the wing for our setups in ST5/TT5. The big disadvantage NA/NBs have is the OEM aero(no air-dam) is horrible compared to other cars in the class. Like a S2K, FRSBRZ, E36 even. Their front aero isn't horrible so they can take that OEM aero mod back :-\
@CoralDoc , I was looking at my Saturday & Sunday fastest laps. One thing I noticed, but didn't document in my notes (wind) is I had a 4 mph reduction in top speed Sunday. Looking at my speed traces, only the straights in one direction were impacted so I'm speculating that wind may have impacted top speeds on Sunday.
Glad I'm not the only 1 that never felt content with how to do Turn 1.
Interesting observation about the possible headwind. Also, it was cloudy on Saturday afternoon and cooler on the Sunday earlier run (when running no wing) compared to the warmer and sunnier Sunday later morning run with the wing.
Thanks for your help at the track!
Also, for comparison, fastest Spec Miata driver times were 2:24.xxx on each day.
After looking at the data, it is striking how similar the car's performance was in each configuration. The slower lap time with the wing was due to driver choice/error. There was a lift in the straight towards turn 4 (kink between hairpins) to facilitate a pass and under-driving turn 6. In general, minimum speeds in the infield turns were higher with the wing, however exit speeds were a little higher without the wing (I suspect due to the greater push with the wing and lack of driver familiarity). For the fastest laps in each configuration, maximum speeds heading into the bus stop and into turn 1 were nearly the same, slightly slower by a few tenths of a MPH with the wing. The maximum speed of all laps in each configuration was 139.9MPH without the wing and 137.6 with the wing. However, speed out of turns preceding banking were very close, and the early part of the banking segments showed very similar speed, with slower speed becoming evident at higher speeds towards the end of the straights.
In summary, once I learn to use the extra grip with the wing to more consistently carry speed out of the turns, it may be the faster configuration. I wish I had the opportunity to test again with a slightly negative AOA to reduce the push (and perhaps further reduce drag), but that will have to wait for someone else (or next year).
I hope to process the videos and upload them once I get unburied at work.
BTW, for some reason my fastest lap video lacks audio. All the other sessions have it. Video obtained with a GoPro Hero 2, so if anyone has any ideas to salvage the sound, let me know.
Just back from Sebring - I am very impressed with the performance of the car with aero. I set personal best times each day and the TT5 track record - 2:33.799 on Saturday and 2:33.550 today. Running with the air dam (no splitter) and wing set at slightly negative angle of attack, the car felt nicely balanced and planted in the turns.
Nice! You likely have the TT5 record at Sebring now?
Yes, sir! 2:33.550
I am very impressed with how much more confidently I can drive the car, especially in the fast turns 1 and 17 at Sebring. The car is PLANTED in Bishop's Bend and through 15-16, the important turn that leads onto the long back straight. I saw the fastest top-end speeds I ever measured in my car of 125.6 MPH due to the faster exit speed out of 16.
9-Lives just came out with that funky "Street ****" in case you feel like spending more money. It does focus on stability improvements with minimum drag, which does seem to fit what you were trying to do at Daytona. Too bad you already did it, though!
Also, the Street **** is made for the street really. It's goal is to provide some help on the rear of the car, as efficiently as possible. I think for Daytona we'd come up with something a little different IF a NA/NB proves to be faster with rear aero at Daytona consistently. NASA nationals is going there for 2021 soooooo I might try to get something together.
Good timing for this thread. I have been thinking about NASA 2021 Daytona for a couple weeks, and also have an ST5/TT5 NB.
Keep in mind that an airdam is not exactly "free". You forfeit the .4 BTM credit.
Taking A-arm and Weight Factor penalties ONLY is the closest a Miata can get to class-max P:W, and therefore the most raw power.
There is a Weight Factor credit at 2450lbs, so you would want to stay equal to or greater than that if you have the capability to make that much power.
The next credit is 2550lbs, and might be worth ballasting up at the same power to get the airdam/wing for .1 less penalty at the same raw power.
2453lbs @ 168.01avg whp with BTM
2453lbs @ 163.53avg whp w/o BTM (Airdam/wing)
2453lbs @ 158.26avg whp with Splitter
2557lbs @ 166.04avg whp with Splitter/wing
2557lbs @ 171.61avg whp w/o BTM (Airdam/wing)
2557lbs @ 176.34avg whp With BTM
Goldilocks(?): 2520lbs @ 168avg whp w/o BTM(airdam/wing)
-This gets an airdam/wing paid for 'just' 67lbs of ballast at the same raw power as the BTM/2450lb build.
There is a potential 10whp spread in mod factor penalties to pay for the drag reduction.
From ~90mph to ~135mph, how much horsepower does having the airdam/wing save?
Good timing for this thread. I have been obsessing about NASA 2021 Daytona since they announced it, and also have an ST5/TT5 NB.
FTFY
On most tracks, the rate of acceleration between 75-100mph is most important. Daytona might be 105-125 so drag reductions that save 10-20whp in aero drag might be worth taking.
Forgive me for being lazy, but what about a big, shallow angle duck tail to reduce drag instead of a wing? Drag wise, a big, shallow duck tail and airdam with 205's on 9's would be the lowest total rolling/aero.
On most tracks, the rate of acceleration between 75-100mph is most important. Daytona might be 105-125 so drag reductions that save 10-20whp in aero drag might be worth taking.
Forgive me for being lazy, but what about a big, shallow angle duck tail to reduce drag instead of a wing? Drag wise, a big, shallow duck tail and airdam with 205's on 9's would be the lowest total rolling/aero.
Talking about something like the drag-racing style "spoilers"? Like this?
Talking about something like the drag-racing style "spoilers"? Like this?
You probably want to test to see what the right angle is but we found that somewhere between 10 and 20 degrees works at ACS with Supermiata duck tails.
10-03-2020, 10:12 PM
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