Powerjection initial experience

[jdean]

So far I have only a couple of hours time running the Powerjection I on a 520HP 418 SBF. Got the Powerjection I vs. III because at the time the P1 was the only one to also control spark timing/advance via the (MSD) Ford TFI electronic distributor. This is the MSD version of the same dizzy that came on millions of mid/late-90s 5.0 EFI Mustangs.
Disclaimer - Comp Mutha Thumpr cam is a not an ideal EFI choice at 236/248 and a 108 LSA, so does not pull a lot of vacuum like a 112 or 114 would. But it was already in by the time I decided on EFI.

Two issues to sort out -

1) It idles too high. Adjustment screw is backed out all the way too. Tech line (Cody) said to cover the small air hole in the top of the TB, which I did and it helped get it to about 1100 RPM.....annoying but not a show stopper yet.
2) At 1800 cruise RPM the AFR is rich at about 11.5. My theory is it is lugging a bit at 1800 causing the MAP sensor to make it richer. When I drop to 4th and get to 2400 RPM cruise it levels out to 13 or so AFR.

The good - starts right up cold or hot, it runs smooth, no hesitation, great throttle response, seems to make tons of power from off-idle all the way to 6000 limiter.

This week is the Texas Cobra Club meet, so I will get at least 200 more miles on it. We'll see if it "self-learns" enough to correct some of the issues.
EDIT: the 520 HP dyno number was acheived with a Holley carb.

[PANAVIA]

What does your timing map look like -- and the AFR is way rich at cruise. have you measured AFR at idle/off idle .?

is there an IAC >? do you have a sealed crank-case >?

is this system SD or MASS >?

[jdean]

It is SD. Yes it is rich right now....both at idle and cruise. Tech support said let it "learn" a while before tinkering with fuel map, but I think I am ready to change the map now after 200 miles of driving this weekend.

I'll check on the spark map. Initial is 15 degrees, and by 2000 it is up to 25, thats all I can remember without looking it up.

[jdean]

OK, about 400 more miles of driving since last post. Throttle response is "right now" with no hesitation. Power is very good.

Keep in mind I am an EFI newbie. I've been annoyed with a high idle for most of the time, but did not have time to call Retrotek or mess with the software until today. All I did was do what the tech line advised....that is the target AFR settings have the most impact and are easiest to adjust. So I hooked up the laptop to the ECU and set the idle AFR to 14.5 and it settled down immediately to maybe 900 RPM. I figure I cant go much lower than that with the cam I have.....gets a bit less than 12 inches of vacuum at idle.

So far I've have no complaints, and I would recommend PJ. But if you can, you should get a cam with an LSA around 112 or more. I have 107, thus the low vacuum.