I wanted to get one more day at the dragstrip before the end of 2023, so I went to the Test and Tune on Sunday. Only had about 7 pounds of nitrous in the bottle remaining.
Pass 1:
All motor with 34 deg of timing up to 5800 rpms, and past that its at 33 deg of timing. Rear tires are at 17.0 psi. Foot-braked to 1821 rpms, launched and it flashed to about 5000. Shifted 1-2 at 6401 rpms and 2-3 shift was at 6450 rpms. Across the finish line at 5966 rpms but the back half of the track I was only about 75% throttle as I heard some kind of metal clinking noise under the car. Not sure what it was still.
Timeslip:
Datalog:
Video:
https://www.youtube.com/watch?v=X5A9bdpGIK0
Pass 2:
150 shot of nitrous with jetting at .027 fuel and .063 nitrous and timing set at 28 degrees fixed. Rear tires set at 16.6 psi. Air bags were 6 psi drivers side and 18 psi passenger side. Foot-braked to 2029 and the converter flashed to 5415 rpms. There seemed to be a bit of quick tire spin, but I drove through it. Shifted 1-2 at 6490 rpms, the 2-3 shift at 6364 rpms, and then I decided to activate the torque converter lockup while in 3rd gear, at 6161 rpms and it bought it don to 6004 rpms . The nitrous clicked off just right before the finish line because it was reaching its high-rpm safety limit and I went through the traps at 6317 rpms.
Timeslip:
Video:
https://www.youtube.com/watch?v=mwJwUyDsBlw
Pass 2 launch video:
https://www.youtube.com/watch?v=OSdfnm1DTMg
Pass 3:
Brought up the nitrous to a 165-ish hp shot using a .030 fuel and a .070 nitrous jet. bottle pressure at 950 and ignition timing set to a fixed 27 deg when nitrous is on. Footbraked to 1645 rpms and when I launched, the tires spun bad enough hat I pedaled it. Shifted 1-2 at 6573 rpms (pedaled it here too) and 2-3 at 6487 rpms. I activated lockup again in 3rd gear at 6181 rpms nad it dropped rpms to be 5868. Went through the finish line at 6478 rpms.
Timeslip:
Datalog
Video:
https://www.youtube.com/watch?v=TUKpRZPvxxo
Pass 4:
Brought tire pressure back up to 17.0. Also decided to progressively ramp in the nitrous on the hit, over a 1.2 second ramp. used the same jetting numbers as previous pass, but moved the ignition timing to 29 degrees instead of 27 deg. Brought he rear passenger airbag up to 20 psi. I must not have fully clicked the "start datalog" button on the laptop, and I didn't notice this until on the return road after the pass. I know that I tried to foot-brake higher than usual, and the car began to creep past the beams, so I just decided to let it go. Tires didn't spin but it felt a little sluggish. Right around the 8th mile it ran out of steam , and I think it was simply that the nitrous bottle volume was too depleted.
Timeslip:
Video:
https://www.youtube.com/watch?v=EqoZ__jyCQ8
Pass 4 launch video:
https://www.youtube.com/watch?v=HRR3SCLmSsA
I might need to go with more air int he rear passenger airbag. Or maybe finally upgrade the oem rear swaybar to something better, but nothing too intense.
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