Hey folks, looking for opinions... I've got a '96 Formula that I basically converted to an LT4 with ported heads and intake and all the necessary valve train goodies. I have a 2800 RPM stall and 3.73 rear gears. Just had it chassis dyno on a Mustang dyno for tuning and put down 295 ft-lbs torque @ 4900 rpms and 321 HP at 6200. I've got a comp cam 305 (07-305-08). It has 114 degree of lobe seperation and 4 degrees advance built into it. I installed it straight up as recommended for optimal engine performance. I'm thinking of advancing it a little more to lower the power band curve. This is my daily driver and I want more throttle response and low end power off the line. I know I will sacrifice top end speed/ power, but I want to go around corners rather than straight lines. My question is considering the power band of the 305 cam, my 2800 stall and 3.73 gears, does it make sense to lower the power band curve or advance the cam more to achieve lower power? Will I lose engine efficiency? What do I need to take into consideration?

 

The problem with advancing the cam is that it drives the Opti spark and all the referenc for ign on the OBD 1 cars is taken from here. The computer program would have to have the curves modified to compensate for this.

Of you could move to the XE 224/230 it would have the same effect basicly.

 

Yup, don't move that cam unless you can compensate for the reading from the opti spark.

-Shannon

 

So basically If I advance it more, I'll need to get it re-tuned to adjust the ignition timing???

 

Yep, Ask Madwolf I do beleive it was him talking about it in another thread (that I can't find)

 

How much advance can I feasibly get away with? I've heard there's a formula that can tell you how much advance to get the power band within a certain range. With my 2800 stall and 3.73 gears I'd like the peak torque around the low to mid 3000 RPM range.

Any one know of such a formula or how much advance I should do to get it within that range? (If that power band range is even possible) Keep in mind, the cam already has 4 degrees advance built into it.