Originally Posted by oldman
AFAIK, they are now in the low 14s. I wonder if the 4 speed auto in the Challenger can take it? I'm assuming the MM supercharger is a 5 speed auto Nag1 equipped car.
When the genie of forced induction gets unleashed on 4 valve variable timed engines, the numbers will keep falling.
Now Challenger SEs will need the 5 speed auto LSD refit kit... I guess it would be a Challenger SC !
I saw the Charger when it was in Chicago land and it does have the 5 speed.
We start to get into an interesting game with the way the gear ratios are set on the NAG1 3.5l 5 speed and rear axel ratio. It makes it a good overall more flexible performer, but not necessarily the best in the 1/4 mile. It becomes one of those "what do you want" issues.
Modern Muscle never got out of third gear in their runs, perhaps with a higher rear end they will, but not necessarily.
Our 42RLE 4 speed third gear is 1/1 with a 3.64/1 differential which is a better 1/4 mile combination, but not the best based on the HP/torque curves for our 6500 rpm engine. It can handle the torque from a blower (especially a centrifugal blower) but I wouldn't want to put on big wheels and reduce the 3.64/1. I suspect that we can easily run a 3.90/1 without sacrificing much in mpg and increase our drivability especially city wise. Our 1/4 mile times would clearly improve. I have a ring & pinion set ordered that "should" fit our differential. Wheel speed is transmitted from the ABS so no PCM mapping should be required. Notice all the "shoulds". I am going to gamble and if it works I'll post what I did. If it doesn't I'll tell everybody what not to try and I will be out a few bucks.