dragster help
I am new to dragsters coming over from fast 10.5 car. Bought a hardtail racetech with 489 Chevy on alcohol (1050 rupert) mechanical fuel pump. Merlin steel heads. Eagle pistons, H beam rods, 4.25 crank Hossier 33.5/17/16 tires. 4.56 gear. 70 runs on tires. NGK plugs gapped at .035. I am struggling with consistency.
I am leaving at 4200 ( air shifting at 6800. Tires at 5.5psi and engine around 160 everytime. In good air running 5.05-5.08 ( 1500 ft low humidity), bad air fell off to 5.17 ( 70 % humidity and 3600ft) Mph 134.5-135.2. Short times vary from 1.12-1.16.
Am i expecting too much to be more consistent than .03-.07 each run. Previous owner ran car in the 5.03-5.05 range everytime! Only differnece is he weighs 25 lbs less.
Anyone have any suggestions for me? Timing recommendations? launch RPM recommendations, tire pressure recommendations? I have not ever started messing with the delay box yet. Any help greatly apprieciated.
thanks.