Originally Posted by SPEEDNEEDS1
Can't say if it is under tired or not but I think it is. I see every one else running a 16.5-17x33's and some with 34.5's. I have access to all of the 17x33.5 and 34.5's that I could ever use, but I have no 16" wheels. The car runs really well for what it is. The track that I have been running it at has several dragsters and most there have 565's with BB3 cylinder heads and we run the same et, so I figure that mine is running ok. I understand that the big tire will slow me down, but I ran with a few guy's that ran this same D2070 tire that I have and had 4.72-4.73 time slips like they was ran off of a coping machine. My car only moved .002 from the 330 to the 660 all weekend. Still ran 4.85 to 4.88 and 1.065-1.086.
My converter was not set up for a dragster, was set up for my 2600lbs door car and it is a 8". Any ideas if this is what the problem is.....
Id venture to say them cars going 4.70s with the same tire have almost the same 60ft as you going a tenth slower ?
Do you know anything about where the converter flash stalls and fallback rpm is ? Sounds to me like you have a lot of wheel speed which makes me think the converter is on the tight side. With a smaller tire you need something a bit looser (6400ish) and more forgiving. From what your saying its good after the shift but from launch to that point its moving around, pull timing, looser converter or bigger tire would all help.
Example of how to calm them down at the hit, 4.72@148 last weekend first pass in my new car, I set the converter upto flash at 6750 and fallback just over 6900. Very loose, deadly and big mph. My 60ft was 1.088-1.090