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

This was just a baseline no tuning yet I will the dyno after it is completely tuned.





3l dyno graph

first off.....my neck hurts now


second....was that a straight swap??

Looks interesting to say the least. Do you have an SVT contour or SE? I'm curious as to which engine computer is in use?

I take it this is a 3L longblock with 3L cams and not SVT cams, with 2.5L dual-runner intake manifolds?

I am so very suprised that there is such low torque at the bottom, but such high torque at the top. Are your spark plug wires new?

I'm kinda thinking that the secondaries opening up cause the first little spike in power, then it drops mysteriously before opening up again later on.
Give us a bit more information so we can explain the characteristics of the graph.

Tom

Straight 3L swap complete with 3L intake manifold and heads.

Yeah...but headers? What exhaust? What MAF? Opt TB? Any headwork done?

I'm dong the same swap...I'd like to know the details...

Here are the details

2001 3L longblock complete with 3L heads, cams, and intake. l TB, SVT ecu, SVT maf, gutted cats, no res. LIke I said this was just a baseline before any tuning. It needs to be richened up down low. Warmonger you are correct about the secondaries. The computer still thinks there are secondaries so it add fuel in the portion of the graph where the power spike is. I am going to have this dyno tuned here soon with a custom chip so it should make the graph a lot more linear.

Chris

Hey Chris nice to see the car is on the road, how many months was it down?

Also do you still have that GTExtreme sticker on your back window? If so... you might want to remove it. (it became a porn site when I didn't renew it)

-Mark

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