But Paul.... I don't see any of that in my logs. Stioich, then richer as the load increases. No spikes. And every one of my runs - all of them, are the same. Remember, this isn't a carb.

Looking at the many dyno plots on here - I don't see any evidence of that occuring either on a properly running truck.

I don't think what he's seeing is normal or accurate. The PCM is calling the shots here... and it's supremely fast.

 

well thats just not even half, and not nailing it, it could be completely different if I were to instantly go WOT. I havent had a chance to data log yet

 

old dyno graph of mine. little over a year ago

this was with no tune stock fuel pump and injectors.. yeah i was lean . 2nd gear pull. damn spiked lean!

heres another i found just using google

 

Yeah here is one of mine from my old engine, it doesnt spike lean for a second

 

If you are looking for a tranny, the 4R100 was used behind the 7.3L PSD from 02-??. From what I have read the E40D was weaker than the 4R100. And it is available in 4x4.

 

ok well the question is, will it bolt up, and can it be programmed?

 

It will bolt up to the 5.4 I just put a BTS in my truck. But it was no esey task!!!!
I had to get 4R100 flex plate/dip stick, tube and bracket/ cross member/ Lightning tranny wire-harness/L computer/change the exhaust to fit around it/ shorten the driveshaft + you need the 4r100 and a torque converter to fit it! Then I added a LFP pan to hold more fluid and a V10 tranny cooler.
You don't even want to know what the total bill was,,,lol.

Phil

 

thats what I figured. Id rather just put some good stuff in mine when the time comes.

 

damn that torque curve looks like converter shutter. that or out of balance tires? did you use beads or wheel weights to balance those tires your using? and its not that it goes lean particularly its just that the air hits before the fuel does. so the a/f goes high then levels off.

 

Actually, that's a specific phenomena that's caused by the film of fuel evaporating faster than it is replenished when there is a surge of air through the intake. You compensate for this through an acceleration compensation setting on the ECU. If you have an electric fuel pump and properly matched injectors, your engine should never go lean. I just watched a 500 hp Mitso Evo get tuned last week with an AEM ECU, its A/F ratio never went below stoich, at the instant from idle to 100% tps the accel compensation made the A/F ratio right at 12.

Your using a stock ECU right? I can't believe that it would be set-up to lean out like that. What kind of control do you have over the fuel map on that beast with the tuner that you are using?

 

Yeah I dont know why it did that, it was the only run that did it.

 

That's really wierd, only one run huh? All the rest were good? Maybe there was some F'up in the ECU and the fuel trims didn't respond fast enough.

Tuning is the pits when you don't have access to a dyno all day long, and you can't tune it the way you want with the tools that you've got. You really need when dealing with that crap.

Well good luck figuring out your fuel/electrical gremlins. Let us know when your running 100%.

 

Oh I will lol, with some videos!

 

haha niiiiice!

 

Careful, it's against the law to kill too many unsuspecting people