AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
- Jan 19, 2014
- Messages
- 25,870
- Reaction score
- 13,175
Maybe not exactly cuz the 340 won't be making peak torque until 4000 or more whereas the stroker might make peak torque 1000 rpm lower.
So the 340 with a 3000 TC might only make say 75/80% at 3000, so say;
2.45x3.91x(397x 80%) =3042, whereas the stroker also at 3000 might be making 90% x 3579=3221., about 6% difference.
In any case this is probably 500 to 800 ftlbs more than is needed to boil street tires on the street, with street-suspension.. Hang on, hang on, My 367 has a clutch and might make 400 ftlbs at 4000; say 250@2000, which with a 10.97 starter gear, easily launches BFG 325/50-15 DRs. So the math on that would be 3.55x3.09x250=2742 The 295 BFG-T/As that are usually on it will launch from less Rs, so say 2200ftlbs.
But we haven't yet talked about the TM (Torque Multiplication) that occurs inside the TC right on the start line. Which I don't know anything about, but have heard it estimated to be a high as 20%,allbeit only briefly. Which kindof makes sense... cuz the factory usually put 3.55s behind sticks and 10% less, or 3.23s, behind autos. In other words the stick cars needed a lil bit more TM, to keep up with the cars that had some built-in TM inside the TC. With that type of logic one could surmise a minimum of 10% inside the TC. However I have no idea for how long the multiplication exists or to what degree.
Long-story short either combo has ample torque to break traction. And ample power to spin to 60 mph.
And so does a well-built 318.
So just build whatever and go have fun.
So the 340 with a 3000 TC might only make say 75/80% at 3000, so say;
2.45x3.91x(397x 80%) =3042, whereas the stroker also at 3000 might be making 90% x 3579=3221., about 6% difference.
In any case this is probably 500 to 800 ftlbs more than is needed to boil street tires on the street, with street-suspension.. Hang on, hang on, My 367 has a clutch and might make 400 ftlbs at 4000; say 250@2000, which with a 10.97 starter gear, easily launches BFG 325/50-15 DRs. So the math on that would be 3.55x3.09x250=2742 The 295 BFG-T/As that are usually on it will launch from less Rs, so say 2200ftlbs.
But we haven't yet talked about the TM (Torque Multiplication) that occurs inside the TC right on the start line. Which I don't know anything about, but have heard it estimated to be a high as 20%,allbeit only briefly. Which kindof makes sense... cuz the factory usually put 3.55s behind sticks and 10% less, or 3.23s, behind autos. In other words the stick cars needed a lil bit more TM, to keep up with the cars that had some built-in TM inside the TC. With that type of logic one could surmise a minimum of 10% inside the TC. However I have no idea for how long the multiplication exists or to what degree.
Long-story short either combo has ample torque to break traction. And ample power to spin to 60 mph.
And so does a well-built 318.
So just build whatever and go have fun.
