Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec new 3L dyno graph

Well that explains a lot!
What size injectors? 24# that come with a 3L or the 19# SVT?
I advise you to use the 19# SVT injectors while you run the SVT PCM, MAF and computer. The A/F ratio will be fine, though like all SVT's it is running rich up top and robbing you of some power. An SAFC will help you lean it out.

You now have proof of what I expected. You have a serious lack of torque in the low ranges because the secondaries are yanked out and it doesn' recover until the RPM and airflow get high enough to take advantage of the opened up ports. I imagine the little torque spike is caused by the sudden increase in timing and fuel that the pcm gives when the secondaries open up. Your air fuel looks fine until 5K rpm where it drops. There may be another factor if you didn't use new plug wires as the graph doesn't look very smooth. Check on those. If you have SVT cams, I'd use them as they would help a lot. Hell, older Taurus cams or contour SE cams that used the secondaries would be more similar to what the SVT computer expects and might help somewhat.
You can improve above 5K by leaning it out but the torque will still drop rapidly because of the type of intake manifold and the cams. As far as the low-end, you may be able to boost the low-end torque a little bit, but not enough to overcome the loss of your dual runner intake setup. A little more power down low may be had if you lean it out some.
What can I say though, for a straight swap the power looks pretty good in its peak area. This is what would be expected from an engine tuned for an automatic transmission. The computer is still running timing and fuel as if it were a dual runner manifold and different cams. Once you get it nicely tuned, I would expect a huge single hump torque curve with a maximum between 4-5K rpms, right where an automatic transmission would make most use of it.

Thanks a lot for finally dynoing with 3L cams and 3L intake system as this helps out tremendously in determining which engine combinations are good for different purposes. I expect that this intake package with a good turbo would be awesome. A faster acting turbo would really boost the low-end and it would hold the power until the redline if the turbo was sized correctly.

warmonger