For a little more grunt off the line (60'), and through the 330' and 1/8 mile, may I suggest 4.10 gears and/or a bigger stall converter. My '07 GT AT is "all stock" on the outside, but I have 4.10's, 3800 rpm stall converter, and DiabloSport "firm shifting" tune. No airflow mods of any kind. 60' times are in the 1.83-1.89 range (consistently with drag radials), 330' times are in the 5.4 - 5.5 range, 1/8 mile times in the 8.4 - 8.5 range, and 1/4 mile in the 13.3 - 13.4 range with a best ET run of 13.280 @ 101.92 (best mph was 102.92).
Since several of you are noting Density Altitude corrections, I feel obligated to share DA corrections for my runs. My home track is Pacific Raceways (formerly known as Seattle Int'l Raceway). 250 ft above sea level, but with high temps and humidity this summer, many of my runs were in air equivalent to 2000-2500 ft above sea level.
So, the best run I've had (13.28 @ 101.92, uncorrected and printed on the timeslip) was run when the DA was 1345 ft above sea level. Corrected, this would have been a
13.09 @ 103.40. I don't have a scanner, so here's the whole timeslip typed out (uncorrected)....
R/T = 0.076
60' = 1.833
330' = 5.424
1/8 mi ET = 8.444
1/8 mi mph = 81.15
1000' = 11.066
1/4 mi ET = 13.280
1/4 mi ET = 101.92
This is with an automatic, drag radials, 4.10 gears, 3800 rpm stall converter, and Predator tuner with a canned tune for "firm shifting" as purchased from
www.rpmoutlet.com. No intake or exhaust mods of any kind! Weight with me in the car was 3,620 lbs (1/4 tank of gas).
The best I've run on the
factory tires, but all other mods noted above, was 13.319 @ 102.13. I didn't have weather info to make any DA corrections, so that is just as it was printed on the timeslip. It was 75 degrees and sunny, and the air "seemed" decent. The whole timeslip looked like this (uncorrected)....
R/T = - 0.062 (red light!)
60' = 1.862
330' = 5.472
1/8 mi ET = 8.492
1/8 mi mph = 81.55
1000' = 11.109
1/4 mi ET = 13.319
1/4 mi ET = 102.13
I had to really cook the factory tires (3rd gear burnout) to get them hot enough to pull such good short times! Probably took 500 miles worth of tread off the tires to make this good of a pass on the factory skins! Drag radials sure make launching super easy and more consistent, but the factory tires can hook if heated (tortured) properly.
I've noticed that many people struggle to get 60' times under 2.000. My 07 GT never launched better than 2.006 with the factory stall converter (and averaged around 2.1), so the 3,800 rpm stall converter has really helped in this respect. Average 60' times have improved two to three tenths with the stall converter. Now, I need to work on getting the new converter to lock-up sooner in 4th gear to get the mph back up (it's lower than it was with the stock converter as it slips more). A little tuning should fix that, though.
It was on a Sunday(22nd), the 23rd was a Monday. Somebody in the tower got out of bed on the wrong side
