AJ/FormS
68 Formua-S fastback clone 367/A833/GVod/3.55s
- Joined
- Jan 19, 2014
- Messages
- 24,870
- Reaction score
- 12,215
If you spread your money around, you won't know which mod gave you the most bang for the buck.
What if one mod made you quicker, and a second one made you slower. Then you go out to test it and you get a big fat disappointment. What will you do next? I would concentrate on traction first.
Zero to 65 is usually a 1gear to 1.5gear deal. And most of the time is spent spinning the tires.Of what use is extending the operating rpm a few hundred rpm. Remember you are trading away bottom end for top end.
With 3.55s, and 88s(sorry 88=28xpi), 6200 in first is about 56mph. 60 will be 6650. So to trap 60=6650 you might want your powerpeak to be at 6300. That's a pretty high peak.Many sizes bigger than the 284.
better it is to gear it to trap60 in second gear. Then you can put a smaller cam in there,with a lower power-peak, and now, because you are using two gears to get there, you may put down more average power during the run, and thus go quicker, with less, no less,lol.
Suppose you buy into this and get yourself a 270FTh cam. This is about 2 sizes smaller. And maybe 30/40 hp given up.And the power peak came down about 400 rpm.
If the 284 peaked at 5200. this new cam might peak at 4800, so the trap speed might be 4800/.95= 5050.To spin that in second at 65mph will require 4.30s. . That 727 has a 1-2 split of 59%. So it might want a 1-2 shift of 5800(46mph), to drop in at 3422. Now you race up the rpm band,putting down near max torque at first and then very near max power from say 4300 to 5200. This will be from 54 to 66mph.
If you plot this on a graph, you will see that you went thru the power band TWICE! Once from 32 mph to 39 mph, and again from 54 to 66 mph.So if you calculate the average power from zero to 65 mph, at say 4 mph increments, with each cam;I bet the smaller cam may get the job done. And the smaller cam will not need a high-rise intake or big heads or anything.
More average power between any two points, almost always wins.
More gears almost always wins.
Never race a Mustang from a standing start. Make him get into second, then show him how it's done.
What if one mod made you quicker, and a second one made you slower. Then you go out to test it and you get a big fat disappointment. What will you do next? I would concentrate on traction first.
Zero to 65 is usually a 1gear to 1.5gear deal. And most of the time is spent spinning the tires.Of what use is extending the operating rpm a few hundred rpm. Remember you are trading away bottom end for top end.
With 3.55s, and 88s(sorry 88=28xpi), 6200 in first is about 56mph. 60 will be 6650. So to trap 60=6650 you might want your powerpeak to be at 6300. That's a pretty high peak.Many sizes bigger than the 284.
better it is to gear it to trap60 in second gear. Then you can put a smaller cam in there,with a lower power-peak, and now, because you are using two gears to get there, you may put down more average power during the run, and thus go quicker, with less, no less,lol.
Suppose you buy into this and get yourself a 270FTh cam. This is about 2 sizes smaller. And maybe 30/40 hp given up.And the power peak came down about 400 rpm.
If the 284 peaked at 5200. this new cam might peak at 4800, so the trap speed might be 4800/.95= 5050.To spin that in second at 65mph will require 4.30s. . That 727 has a 1-2 split of 59%. So it might want a 1-2 shift of 5800(46mph), to drop in at 3422. Now you race up the rpm band,putting down near max torque at first and then very near max power from say 4300 to 5200. This will be from 54 to 66mph.
If you plot this on a graph, you will see that you went thru the power band TWICE! Once from 32 mph to 39 mph, and again from 54 to 66 mph.So if you calculate the average power from zero to 65 mph, at say 4 mph increments, with each cam;I bet the smaller cam may get the job done. And the smaller cam will not need a high-rise intake or big heads or anything.
More average power between any two points, almost always wins.
More gears almost always wins.
Never race a Mustang from a standing start. Make him get into second, then show him how it's done.
Last edited:
