EFIDynoTuning Forum

I sent a long text today, Wed, 7-30-23. Please read it.

Another note-

2 different things going on???

1- When I pin to WOT I get the bog in 2nd gear for datalogs.

2- When I accelerate more gradually through that same rpm range I do not get any bog and my fuel psi gauge does not waver either time.

Just info- I have not touched my FP regulator and I had 6.5" of vacuum at idle with my old cam and I now have almost 9.5" at idle and I am at appr 38-39 psi when I turn the key on prior to starting.

I ran a fuel pressure check and it stayed at the (on my gauge) 38-39#'s up thru 5,000rpm.

I left you a couple more texts and a brief voice mail.

Are you able to see the bog in the datalog I sent?

Put another 40 miles on it today. Runs good till I hit the pedal hard. I watched the AFR carefully and at appr 4200rpms it bogs and the wide band reads over 15.2:1. Seemed to do it once, catch itself and then do it again above 4500rpm. Fugly!

I know nothing about tuning this system but it sure seems that lack of fuel could be causing that "bog" or whatever you want to call it. I don't notice it as much when it's not under a real load when doing a quick 2 sec burnout on my bridge tonight.

Correct, didn't touch the fuel

Michael-

Did a data log tonight.

New wires with resistance checked, new Motorcraft plugs gapped at .050".

You probably don't remember but we had a "bog" or hesitation of some kind around 4K or so last time and couldn't figure it out Anyway, it's much worse now.

You'll see it in the datalog.

I can send you a pic of my air intake if you think you want to see that.

Whatever you need but it's a very noticeable "lack of power" in the rpm band then it takes off fine and accelerates like a bandit to redline just like it does from idle to this rpm band.

Brian

Reading your dyntotuning pages again... sure is a lot of good "stuff" there. :)

Fuel pressure should be at 42psi at idle from our previous tunes correct?

I'm just asking for clarification is all. Here's the quote from your tuning page: "Decipha recommends 65psi of base fuel pressure for injectors smaller than 80lb."


I

Timing is at 11deg BTDC.