[Gomeler]

Originally Posted by FormulaMMM

Bummer on the water system. Maybe this is dense, but... could altitude be playing a role in reduced power output reading??

~3% loss per 1,000 ft. 493 stock at 5,000 ft = 419 bhp.

I thought it might have been elevation as well, but the monkey wrench is that the car dyno'd identical to a M3Comp, ~440whp altitude corrected, while showing ~420hp on the iDrive. All this year the car has shown 420hp on the iDrive. Unfortunately COVID-19 ruined my plans of going to COTA in August, that would have been an interesting elevation change test.

Originally Posted by FormulaMMM

So you are at stock/street ride height setting and 18s now? Have you run at track ride height yet? If still at street, maybe that is a contributor to the sense of heaviness.

Dropping to track height is my next step. I'd been putting it off because 1) I thought I'd street drive this car 2) I was trying to find the limits of the current alignment/height. COVID-19 broke #1, and I'm getting close to #2 given my skill level.

Originally Posted by FormulaMMM

Interesting that the efficient setting parks more heat in the muffler.

To each his own and don't doubt others have gotten the best out of the car in efficient. The sharpness of the sport plus throttle setting is one of the highlights of the car on track imo. Suits the hyper-responsive overall character of it, and pretty much cancels turbo unpredictability.

I've only driven the car in efficient on the track, and the car sounds real funny. It goes from vrrrrooooom vacuum noises to adorably obnoxious rasp at weird points. I wasn't expecting it to route so much exhaust through the muffler, but basically anytime I was partial throttle you can hear how muffled it is.

I thought sport+ was amazing, until I started trying to put power down as early as possible. I didn't have the harness, so my inputs unintentionally pretty rough. I'm still not 100% sold on efficient vs sport, it's possible I could achieve the same levels of control in sport.

Originally Posted by FormulaMMM

Corner starting at 1:14 -- isn't that a big wallop of turbo lag on corner exit due to efficient throttle map? Corner at ~0:55 you're on the gas at apex, but it doesn't sound like you're getting a response until almost track out. Corner exit at 1:40 almost sounds like you backed off power because of a delayed power spike.

Not trying to be critical, just looking for the advantages and disadvantages in the footage. Seems like efficient throttle you're inviting turbo spike and losing predictability and control on throttle during corner exit.

1:14 is T8, 0:55 is T6. In both cases if you watch the torque meter you can see it goes from ~250ftlbs to ~450ftlbs very quickly, corresponding to a very minor wheel correction in T6, and a full-blown oversteer + correction in T8. It's very important NOT to listen to the exhaust note, T8 for example is nearly full boost/torque while muffled, when the baffles open the rear is already kicking out. This is what fucks with me constantly in this mode, the exhaust note isn't congruent with the power levels.

1:40 is T11 exit, and it's been the rear tire grip fall-off corner test. At the start of the session I can WOT it from a car length after the apex, but as the rear heats up I go from a wheel correction and drive through it, to serious throttle modulation.

Originally Posted by FormulaMMM

For those who have found the setting faster -- is it because you're able to modulate and get on the gas earlier? So you're gaining small bits of speed mid-corner where any throttle application in sport plus setting would have delivered too much power?

Right now I'm not sure if it is placebo, or if it is actually helping. I've got ~6-7 sessions now in efficient, and I've cut some of my fastest and most consistent laps with it. However, in that time I've also gotten much more comfortable with the Toyo RRs so.. . Next time out I'm hoping to remember to test sport and sport+ again.

Originally Posted by FormulaMMM

Looks like a really fun track and good to see your young mechanic in on the action.

Thanks, it's my home track and I love it. I almost never feel unsafe looping the car here, besides other cars there's almost nothing to hit besides the occasional deer. I'm hoping this kid likes karting, because I'm all ready to give him the chance that I didn't have