- Joined
- Jan 3, 2012
- Messages
- 799
Little behind on posting this but I figured I could use the feedback to make changes over the winter. Sept 20th at Cecil County Dragway was the East Coast Buick Regionals and I made my first ever passes down a track. Track prep was good, temp was about 75 degrees. I was mainly focusing on getting the car to leave. With vacuum brakes I found it difficult. Left my street tune in place (19psi, 19 degrees timing, 93oct w/ 5 gal of vp110, no alky, 396whp 402wtq). 255/60/15 MT ET's @17psi, rear air springs (8psi LT, 15psi RT). Made 5 passes total. Last 2 were the best.
#4: 9psi off ebrake, forgot to lock converter until 1000ft.
60ft: 1.74, 330: 4.969, 1/8: 7.709@89.69, 1000: 10.071, 1/4: 12.075@112.25
#5: 10-11psi off ebrake, locked converter @ 1/8. Logged this run, shows 11.7-12 actual AFR. Trans seems to shift to early (5000), falling to 4500 on each shift.
60ft: 1.73, 330: 4.943, 1/8: 7.67@90.16, 1000: 10.023, 1/4: 12.011@113.36
Considering my lack of driver skill and the conservative tune it wasn't too bad.
The week after I went to 7580 Dragway. Loaded up a race file and turned the boost up a bit (22psi, 24-25 degrees timing, 1/4 tank 93 w/ 10gal 110). Same suspension and tire setup. Nice cool 55-60 degree air, but this track usually isn't as fast. Made 3 runs, each of which I had the same issue. Just before 1/8mile lost 10psi boost and timing was pulled, then got it back around 1000ft. Maybe too much timing in the tune. Best run was the first:
8-9psi off ebrake
60ft: 1.66, 330: 4.909, 1/8: 7.838, 1/4: 12.386@110.70
No question there is a lot left in this car. Its probably an 11.7-11.8 car as it sits on the street tune. I will be adding an alky kit over the winter. With more boost, a trans adjustment or two, and more seat time, I hope to get down in the low 11's at least.
#4: 9psi off ebrake, forgot to lock converter until 1000ft.
60ft: 1.74, 330: 4.969, 1/8: 7.709@89.69, 1000: 10.071, 1/4: 12.075@112.25
60ft: 1.73, 330: 4.943, 1/8: 7.67@90.16, 1000: 10.023, 1/4: 12.011@113.36
The week after I went to 7580 Dragway. Loaded up a race file and turned the boost up a bit (22psi, 24-25 degrees timing, 1/4 tank 93 w/ 10gal 110). Same suspension and tire setup. Nice cool 55-60 degree air, but this track usually isn't as fast. Made 3 runs, each of which I had the same issue. Just before 1/8mile lost 10psi boost and timing was pulled, then got it back around 1000ft. Maybe too much timing in the tune. Best run was the first:
8-9psi off ebrake
60ft: 1.66, 330: 4.909, 1/8: 7.838, 1/4: 12.386@110.70
No question there is a lot left in this car. Its probably an 11.7-11.8 car as it sits on the street tune. I will be adding an alky kit over the winter. With more boost, a trans adjustment or two, and more seat time, I hope to get down in the low 11's at least.
