I am starting to tweak my '72 Mach 1 for strip/street duty. I have aluminium headed 460 cid with app. 580 hp, TKO600, moser 9" rear with aluminium case, MW pinion support and 3.89 gears with detroitlocer. I have been loosing some weight from the car and it is now 3790 lbs with a driver. Car has mid-eye 175 lbs rear leafsprings with Calvert Racing Cal-tracs. Front has 600 lbs springs.
I have added Weld Prostars for the car and 295/55-15 MT ET Street Radials (equals 27.80 x 12 - 15). I have also coming a set of shockabsobers modified by ex-prostock racer, front shocks have a quick outbound & slow inbound, rear is slow in both ways slow out & inbound.
I will test drive the on spring, I will open up the front swaybar. I have cal-tracs currently in the lowest positions, I will test the passengers side to the upper hole and keep the drivers side in the lower hole.
Here's a one example of my car in motion with 28" tall tire (275/60-15)
You can clearly see that the startup is pretty good even now, but then the rear tires starts to loose traction and the nose dives. Current start I was staged too much to right away from the best traction are. Car ran 13.706s / 114 mph.
My two second starts were allmost similar, but not so severe wheelspin because I lined up better to the stage. Last two ET:s were 12.987-12.974s and 117-117.5 mph, 60 ft times were 2.356-2.390 on all three starts. I ran on fourth gear to the finnish line with 5700 rpm - engine has peak hp power at 6300-6400 rpm.
Any ideas fellows how to improve? Are my thought somewhere between right & wrong? My target is to achieve 1.80s 60 ft times and +6000 rpm on finnish line on fourth gear.
with my current combo on fourth gear (straight 4th 1:1 gear, 3.89 rear and 27.80" tire):
Pretty long message but all input from fellow Ford guys is highly appreciated. Thanks.