Help Make Sense of my Dyno numbers (fuel problems)

[65racecoupe]

I recently took my car to the Dr Gas dyno in Sandy Utah. You really find out alot about your car when you dyno it.


Anyways, my numbers were
289 hp and 289 ft lbs torque at 5100 rpm. After that, it drops off the face of the earth. 289/289 is really good at that rpm concidering my peak should be 2000 rpm higher.

This would explain my 14.2 in the 1/4. I was shifting at 6800 rpm. I will be down in the mid to high 13s shifting at 5000, even though my engine has a ton left in it without the fuel problems.

My 331 is made to rev to 68 - 7000 rpm. Neal, the dyno guy, said that my fuel delivery is to blame. It could also be the alternator not being able to keep up (making the fuel pump not keep up as well).

I have a 140 GPH Mallory electric fuel pump, fuel filter, and fuel pressure regulator.

I have an autolite alternator. I guess it wouldn't hurt to get a 140 amp alternator while I am at it.

Am I on the right track?

 

[dodgestang]

That's quite the wall....I know it sounds simple, but did you confirm

1. You had a full throw on the throttle
2. The secondaries are actually opening

 

[65racecoupe]

Actually, no. We went straight to the fuel problem because the FPR guage was going crazy at 5000 rpm and higher.

 

[brianj5600]

A/F ratio is most helpful as well. If it is electrial it would go pig rich. Fuel related pig lean?

 

[69Rcode_Mach1]

Hey 65 racecuope i didn't know that neal had finally got the chassis dyno up and going. Finally we have a chassis dyno in Utah. How much did it cost for a pull i think i might want to try it out later on for the same reasons you did. Also do you have an AIM account or anything i would really like to get to know some more stangers in my own state. Sorry didn't mean to hijack.

 

[slapper]

Is the fuel supply line big enough?

 

[bull999999]

From several dyno articles I've read in the past, there's been many cases where an engine will experience a sudden drop in power at high RPM due to the valve float or the valves bouncing open after it closes due to the weak springs.