03 on the dyno today....

[tcrews]

Originally posted by sn8kbit

neat thing was, the A/F curve never leaned out past 12.6:1 which is just about right.

On the dyno? That's pushing it for a boost A/F ratio. Once the car is actually on the road and having to move the weight of the car (vs. spinning the dyno rollers) the A/F is going to jump up about .5 putting the car at a 13.1:1 A/F which I'd be a bit uncomfortable with.

When dyno'ing you want to hit at least .5 below your target A/F ratio to allow for the change in road A/F vs. dyno A/F.

Great numbers though.......those '03s are pretty darn impressive!!

[Evilcartman]

Originally posted by cobrabitn
Steve, the stock boost is either 6 or 8 lbs and when you put the Lightning pulley on it, it jumps to 14 lbs. Slap on an OR pipe and a cold air kit and can you say over 500 hp at the flywheel?

Actually, Ford claims the stock boost is 7.5. I have also seen it posted at 8 psi. The stock Lighting pulley (2.93) adds 3-3.5 PSI. I'm seeing about 11 on the gauge, even though it is not a real accurate gauge. I think that the aftermarket 2.80 pulley can give you up to 13-14 psi in cold weather. 2.80 is the smallest you can go due to the snout clearances. A lower pulley would be the alternative to getting even more boost.