2.56 vs. 2.73 vs. 3.08
Interesting debate in my mind...
Stick with the 2.56 12 bolt in my MC or change to 2.73 (I have a second 12 bolt with 2.73, and it is free) or look for a 3-Series carrier and pick up a 3.08?
The more I think about it, the more I'm inclined to stay with the 2.56.
So hear me out...
Car is very nice, my goal is at most an 11.50-12.00s cruiser with as conservative package as possible. If it ends up running 13.50 at first, so be it, but is it possible to have your cake and eat it too? Near stock stall and highway gears, at 4300 lbs?
Anyhow, the debate between 2.56 vs 2.73 vs. 3.08
2.56 (rear gear) working with 1.52 (2nd gear)
117 mph @ 5700 rpm,
124 mph @ 6000 rpm
1911 rpm at 60 mph - cruising speed
2549 rpm at 80 mph - highway speed
5569 rpm @ 115 mph - hopeful 1/4 mile trap speed, finishing in 2nd gear
2.73 (rear gear) working with 1.52 (2nd gear)
110 mph @ 5700 rpm
116 mph @ 6000 rpm
2038 rpm at 60 mph - cruising speed
2718 rpm at 80 mph - highway speed
5939 rpm @ 115 mph - hopeful 1/4 mile trap speed, 2nd gear
3.08 (rear gear) working with 1.52 (2nd gear)
103 mph @ 5700 rpm
98 mph @ 6000 rpm
2300 rpm at 60 mph - cruising speed
3066 rpm at 80 mph - highway speed
6700 rpm @ 115 mph - hopeful 1/4 mile trap speed, 2nd gear
4408 rpm @ 115 mph - hopeful 1/4 mile trap speed, drive gear
I'm inclined to go no deeper than 2.73, because of the highway cruising rpm. As little difference as switching to 2.73 would appear to make, it seems sticking with 2.56 would make sense.
I don't plan on an engine capable of 6700 rpm in this car, and shifting to Drive with the 3.08 will kill power at the end of the track.
I'm thinking a big stroker, conservative cam, good working heads, and my goal is achieved with 6000 rpm shift points. This makes sense if you can get off the line with prodigious amounts of torque.
Kudos to anyone willing to read this babble and comment.
1981 Malibu wagon
Best ET NA 12.20 @ 110
Best ET w/N2O 11.47 @ 117