Writing this recap of the track rental session from last Friday, October 27th at Island Dragway.
The weather was way warmer than normal, so the DA was mostly in the 1600-2000 range. We got started way way late but I made 3 all motor passes. Nothing exciting, but on the 4th pass I wanted to test out what would happen if I just got the car into 3rd gear at the 8th mile and sprayed the 150 shot jets (0.59 and .030). It showed high afr numbers like usual, but was not making any mph, but was not problematic to shut off the nitrous. Pulled a plug afterward and it was unhappy rich. For continuous checking throughout the day I pulled plug #7 which is the same one we were pulling while on the dyno.
https://www.youtube.com/watch?v=ezSmhOMEltI
For Pass #5 I changed the jets to a .062 and a .027 and hit the button right off the launch. It finally felt strong, and the 8th mph was back to being above 100 mph finally. It went 11.19 with a bad sixty foot and over-revving both shifts. but.. my mph was finally back above 120 mph and the engine didnt feel like it was eating itself up either. Even last sunday at the TnT when the car went 10.910, it was only at 117 mph and it felt ugly. Now, the mph and power has a proper feel to it.
https://www.youtube.com/watch?v=dUewZOuFGTk
Pulled a plug again and couldn't get a good read on it. Kept jets the same, because it is what the 150 shot jetting is actually supposed to be in the new chart.
Sidenote - I had a heck of a time getting the car to do a proper burnout most of the day. I mean, normally I do pretty much the same routine and it works most of the time. But on the rental day, the car just didn't want to make wheel-speed and wanted to dart to the right a few times. I corrected this around pass 5 or 6 but I had to lay into the throttle a lot more than I usually have to at the burnout box.
Went a 1.48 in the sixty, but hit the limiter on the shift. Made a full clean pass and it was a 11.05 at 122 mph. Still showing datalog closed loop wanting to remove a lot of fuel. Checked a plug once again but it seemed ok.
https://www.youtube.com/watch?v=amXVu12NYq4
This was the launch photo Jerry took during for Pass 6:
Pass 7:
Same jetting as pass 5 and 6. Car went 1.46 in the sixty foot and pulled good up to the top of 2nd gear. And then despite a high afr, the rich cutoff activated again and I finished the pass on motor.
https://www.youtube.com/watch?v=TMLQ1tWAcWs
Pass 8: Changed the jetting to be .064 and .027 . I hit the button late, and despite the power pulling strong, I saw the nitrous bottle pressure gauge drop heavily durign teh run so I knew that the bottle was basically done. This bottle only had 8 pounds in starting on pass 4. The car went 11.25 at 119 mph.
https://www.youtube.com/watch?v=8t4UbPSa7P4
Pass 9, I swapped the bottle and now using the .064 and .027 combo the car made a good clean pass. It went 6.95 at 101mph to the 8th and 10.90 at 123 mph. Afr numbers on the gauges during the run were nice and in the 12s and the plug checked out great.
https://www.youtube.com/watch?v=J1WxCAafZX0
I had to get going home but I wanted one more crack at maybe a 10.70 pass with a bigger nitrous shot, so I quickly dropped in the .070 and .030 jet because I was greedy. It ran , but it wasn't overly happy, so it only went an 11.03 but at 124 mph. It actually was on the top-end rev-limiter again just within reach the finish line, so that slowed me down.
https://www.youtube.com/watch?v=L--5WElt_ug
So, despite me not getting any personal bests, I was pumped up to know that I seem to be heading back into the right direction with mph and et. over a year of nonsense, but finally seeing numbers that are relatable. I am hoping for one more track day of the year, but if not, I know I have a good starting point next year.
On a relate note, I took some photos of the rear wheels/tires after the event, and its apparent that I do have a good bit of wheel movement in the tire bead on both sides.
