Autocross SSM Post Event Download.
First Competition Day on New spring rates...and Hoosier 245/40/17. Though we had previously run Rivals in same listed size the reality is the Hoosiers are far bigger than the Rivals and previous attempts to fit them on the car resulted in massive rub, some fender lip cutting of the tire, and even partially popping off the front nose. Now with more spring rate, 11kg, 6kg, and taller bump tops to help limit roll and travel the Hoosiers worked today. We are running quarter inch higher than previously, about 13.125 all around in effort to make the Hoosiers fit safe. Bottom line on new Hoosiers....today they fit and worked great, car stuck.
New 11kg/6kg rates on our Ohlins worked great....balance with Progress sways was great, car throttle rotated on demand and rarely surprised me, yet turn-in response was much faster than prior soft 9/5 combo. Have run as much as 13/9 on this car with these Ohlins but our local lots looked bombed out with serious pot holes and some compromise and compliance in rates is needed here.
Now the part that did NOT work. Yesterday for practice stopped at our usual station that has 100 octane at the pump and put in my estimated fill for practice yesterday and competition today...and car ran on the high boost setting successfully yesterday...11.5 PSI. This morning it was my judgement that we needed just ONE more gallon to be sure we could complete our runs and drive out of the event. Arrived at same station that has 100 octane at the pump to sadly find "Sorry, Out of Order" on the 100 octane buttons! So, decided to blend in just ONE gallon of 91 octane thinking we had enough headroom in the high boost tune for that to work. That analysis proved dead wrong....lost both my first runs to detonation and ECU rolling out all timing. The ECU took such swift and aggressive action in the first run that I honestly thought I had busted the car or spun/overheated clutch in and briefly pulled off the course until power came back... and got a well earned DNF. Power returned and I alternated on and off it to test through finish knowing the run was already wasted. Thinking I had merely spun/overheated the clutch with dump start of the first run I let the car cool a lot....but second run same thing again and I finally understood the issue was serious detonation and cruised into the finish again well off the pace of what the car could do.
Shut off the boost controller and ran stock AVO kit 7 psi for third run and drove conservative to get a clean time to take the class lead, did slightly better on fourth run to cement the class win today by .8 seconds. Disappointed only because the car honestly was telling me by feel that it had more than a full second of additional speed potential and I know we left a lot of potential on the table. I missed top time of day for the morning by a few tenths and that's a bit frustrating too knowing the car had a lot more in it if everything had worked right. Nonetheless, it's another win for the AVO turbo..plus the new spring setup and the new tire setup and that's enough for one day....will look again for that Top Time of Day next event with pure 100 octane in the tank.
Post note...after first run DNF I could hear something with driver's rear tire but could not see anything while at the event....got home and monster bolt stuck in the tire. Thus, the DNF cost me more than time.