Ford vs Chevy Build-up

[HandOverFist]

Originally Posted by fordteacherguy

Rich,

Lean that tune up to around 13-13.2 and watch it pick up a ton!

Brian - The second pass (handed off to Kenny) he reported 14.0ish before he crossed the stripe. I did not have the camera in the car that pass and took him at his word...was afraid to lean it any further at that juncture. I'm pretty sure it's still a sour air/fuel ratio problem which I will have to get a handle on.

After Alan brought up the drive shaft phasing I began to doubt myself and took a look at it again today...all looks good as far as I can tell. I'll re-check pinion angles again. Car is on a lift with the rear fully extended in the pics, thus the extreme angle at the pinion.





Junk shots under the car...









Had some popping going on at cold start initially...figured it was lean at idle and WB confirmed. Gave it a little more fuel at that point and calmed it down. I'm wondering if I should just remove the piggyback for now and let the wideband O2 sensor tell me what to do via fuel pressure adjustment.

[SSGT Mustang]

Is it an illusion, or has the u-joint moved? It looks like it's not fully seated to the end of the bore on that yoke (bottom bore in this picture).

[HandOverFist]

I'll look at it close today, but if you view the rear it has about the same appearance.

Edit : U-joints are fine.

[HandOverFist]

Failing to find anything of significance thus far I feel its time for a large move to test for effect. I have either missed the mark on the engine assembly or the fuel events are way off. Thinking of removing the aftermarket controller and letting the factory ecu do it's thing...I can adjust the fuel pressure and monitor the wide band O2 readings.

[SSGT Mustang]

Don't do that. You'll hit the rev limiter, and not be happy.

It's your first time out. Leak the motor and adjust the valves, then bring it to test and tune. Make 10 hits, make one change at a time, and log the changes.

It sounds a bit sluggish out of the hole. You may need to give it more timing. Let the engine and trans find their way. Don't be afraid to lower the shift points. What did you install the cam at?

Most importantly, talk to John Pressing. He went 11.50 in L/S I believe 10 years ago in one of those cars. There are lots of guys with good experience on this board, but from my point of view John's the guy you want to talk to.

[HandOverFist]

Working my way from back to front I found an interesting item today. My TPS sensor is only registering a maximum of 92 percent WOT. Rounded a new one up and will test it tm...if that knocks another 3 tenths off it will be the best $35 I have spent in awhile.

[HandOverFist]

No joy with the new TPS sensor...best I can achieve is 94% throttle. Must be a voltage thing and I don't know how I would allow/adjust for that. There is a variance scale screen in the handheld for TPS set-up, but I have not been able to get it to move one way or another.