1/4 mile time

[kato]

i have a 71 challenger with a 383 stroked out to 426...dynoed at 485 hp and 505 tourque...running stage 2 727 tranny with a 3.55 sure grip diff.. tires are MT et ss street (25 psi) no spin...reaction time is about .2..(i know.could b better) 0-60 ft is 2.1 secs and final trap is 13.22 at 106 mph..carb is quick fuel 700 cfm on a m-1 single plane intake ..running msd distributor and premium fuel..edelbrock performer heads..edelbrock fuel pump..tci headers..TCI 2900 stall and extreme energy comp cams (21-225-4)

how is this time?? i was kinda disappointed in it
thanks for any info that i can get to make this set up faster

[cudabob496]

I would say you need 3:91 gears in back, and
a bigger carb (well tuned 850 dp), and stall around 3500.

lightening up the car helps. ie shaved 40 lbs off each front wheel by removing Cragers, putting on Wilwood disc brake set, Weld Prostar wheels, and lightweight  and skinnier front tires

timing curve in dist may be off.  Getting a tune job on a chassie dyno would be valuable.

I run my MTs at 20 psi.

synthetic fluids everywhere.

[Chryco Psycho]

I see approx 335 RWHP which is good
there is always a lot in tuning but I assume you did this on the dyno
 The car is slow to 60 ft so there may be less traction than you believe or you need more reaction from the car with weight placement or front drag shocks .
Carb is too small
 Cam sucks , Lunati Voodoo offers similar lift with less duration 703 or more lift with similar duration part 704 widening the powerband

[Strawdawg]

That 60' time killed you...you can figure at least a 0.15 sec gain in the quarter for each 0.10 reduction in the 60' time.  I think Chryco is right.  Those tires should have gone up in smoke....show's a lot of promise, I think

[cudabob496]

also, want to have good weight shift to rear when you launch, for tire traction.
too stiff of rear shocks can prevent good weight shift.
Also, an ajustable pinion snubber is good, and getting your
pinion angle correct with shims helps a lot.  I installed the 3 degree
negative shims under my leaf springs.