hardtail help needed

[holeshotta]

Am running a 496 chevy in a 225 hardtail. Glide with 5600 stall 4.30 gear, new Hoosier 33.5X17X16. on poor tracks 60 ft is 1.17. went 1.14 today, ran 7.95 @ 166.78 on last pass. Running tires at 5.6 psi. any thoughts on launch RPM or tire pressure? 60 ft is the same leaving at 3500 or 4100. thanks much

[hammertime]

sometimes hardtail cars need to hit the tire harder, try 4400ish. Them tires co6's or co7's ?

What are you looking for, more consistent 60ft from good to bad track ? Your converter is tighter then most so its going to affect 60ft a bit more then a looser converter would do.

[holeshotta]

looking to keep consistent 60' and pick up a bit of ET. i am thinking of a looser converter as well. the tires are CO6 Hoosier. any thoughts on this range of 60 ft times? I ahve only made 60 passes in this car.

thanks
TA

[hammertime]

was it the same track or a different track ?

My car is what Id call "stupid good" most the time, last weekend at one track it was 1.098-1.101 all day, yesterday at a different track, 1.028-1.036 ... only difference is one tracks 60ft cones are off.

Even on the same track day to day, as long as its consistent all day on that day I wouldnt worry a bunch, but if it starts moving around a lot Id start to worry.


Loose converters are deadly IMO but normally not fast.