6 cyl a230 ?s
And I whole heartedly agree with Garrett, except I personally would stick with the 2.45-1.45-1.00 box which are close ratios, and put the 4th ratio in the TC with a lock up for the hiway. With this combo and a high stall, you wouldn't absolutely need the 4.10s, out of the gate.
A mid-12 is ~107/108mph. with 27" tires, and a 230cam this makes about 5500 as ideal at the top so that would be 3.99s which rounds either way. I choose 3.91s and that would get you ~5500, in 1.00 top gear.
Out of the gate, 3.91s and a 2.45 low will get you a starter gear of 9.58. A good hi-stall will multiply that at zero mph by about 1.8 so now you are up to 17.24
With a 360 launching at 380 ft lbs, your tires are trying to deal with
6550 ftlbs at zero mph, so there is no way you can launch at full throttle without tirespin.
Compare that to the slanty/A230(3.08 low) and 4.10s; I get; 3.08x4.1x380=
4800 ftlbs .
Then,60ft out, the TC might be down to 1.4,or so; and I get 3.91x2.45x1.4x380=5100 still 6% more than the A230/4.10 combo.
When you hit second 1.45 ratio, the TC might average 1.3 for the entire duration so;
3.91x1.45x1.3=7.73 ratio, compared to the A230/4.10s at
4.10x1.65was it?=6.77, the automatic still out ahead.
In top gear;
the TC might be average 1.1 or so, and I get 3.91x1.00x1.10=4.30....
compared to the A230 at 4.10x1.00=4.10, the auto still out in front.
The downside of the 3.91/auto combo is; 65=3160 in loc-up, but hey
the A230/4.10s are turning 3310,lol, the automatic is still winning.
Now back up the bus;
With a 360 launching at 380 ft lbs, your tires are trying to deal with 6550 ftlbs at zero mph,so there is no way you can launch at full throttle without tirespin..
what are you gonna do about this? This is why you don't need the 4.10s. You don't even need the 3.91s here !
If this car also has to be a streeter then;
Put an extra 20hp in the engine, reduce the stall, and run less rear gear, and let the Quarter be what it will be. A 13 second street car is still a raging bull.
