Ford Mustang Forums banner

1 - 4 of 4 Posts

·
Registered
Joined
·
848 Posts
Discussion Starter #1
I’ve got a 347 with stock suspension and Nitto 555R drag radials on 17 inch combat replica wheels.

Car has TKO600 with Ram HD clutch, 31 spline axles, etc so driveline is built to handle the power.

What is recommended initial air pressure I should start with.

What would recommended launch RPM

My peak Hp on the dyno is 404 Hp at 5750 rpm. Planning to shift around 6200 to 6300 rpm

I’ve got Lakewood 70/30 front struts and Strange adjustable rear shocks to go on car but wanted to get initial numbers to compare the gains.

I’d like to lower the car a bit for looks. What springs would be best trade off?
 

·
Premium Member
Joined
·
1,340 Posts
I would start at 2500rpm and slip the clutch. Raise rpm every pass to find the limit of the drag radials. Beware of axle hop - drag radials break sh*t when they shake.Tire pressure I would start around 20psi. No burnout, just clean them. Single or double adjustable shocks? You will have much better results with a set of slicks if you can get a hold of a pair. They are much more forgiving to a stick car. Good luck, have fun.
 

·
Registered
Joined
·
848 Posts
Discussion Starter #3
Thanks for the tips. Got rained out last week.

The rears are single adjustable.

I have Maximum Motorsports LCA plus I still have the quad shocks in.

What normal breaks? I’ve got a fully built driveline.

31 spline, TKO600, reinforced torque boxes, new rear diff with carbon fiber friction plates, etc.

According to calculator it estimated high 11s with a 1.8 60 ft.


I would start at 2500rpm and slip the clutch. Raise rpm every pass to find the limit of the drag radials. Beware of axle hop - drag radials break sh*t when they shake.Tire pressure I would start around 20psi. No burnout, just clean them. Single or double adjustable shocks? You will have much better results with a set of slicks if you can get a hold of a pair. They are much more forgiving to a stick car. Good luck, have fun.
 

·
Registered
Joined
·
241 Posts
What breaks is whatever is behind the clutch if it has excessive base pressure and / or counterweight pressure. Not knowing the details of your Ram, just saying this in a generic context. Clutches as described, while good for a street car with power under the hood, will wreck havoc from the flywheel back when launched without any slippage ("dead hook”) on slicks at higher RPM’s. Transmissions and rear ends can and do fail as a result. But I’d still rather race a clutch car any day over an automatic! Good luck and have fun.
 
1 - 4 of 4 Posts
Top