EFIDynoTuning Forum

Truck is a 1995 4.9L, originally E4OD with a ECM marked "SUB2" (SD47A). About 10 years ago I ZF swapped it and replaced the ECM with one out of a junkyard 1993 manual 4.9L F150, box code "ANT1" SD40A. I've never had any trouble since the swap.

I'm currently building an engine for it and will need to tune it. I ordered a quarterhorse and downloaded Tunerpro RT. The plan is to eventually have Decipha remote tune it, but I figured I should learn how to use the quarterhorse while the old engine is still in it rather than risk blowing up the new engine as I learn. The goal for now is to datalog it to ensure the system is working right, get a feel for modifying the VE table, and finally try adjusting for bigger injectors.

So far I've downloaded Efloth's stock J1X tune and looked thru everything in Tunerpro. I have not attempted to connect to the quarterhorse yet. For now I just have a couple questions:

1) Can I use Efloth's base tune and adx file on my ANT1 box?
2) Can I read the stock tune off my ECM and use that as a starting point instead? My understanding is that this should be possible since Decipha has provided the xdef file but my understanding of how all this works is still a little rough....

Thanks in advance

1) Yes, not sure how broken out it is, A1C is probably the way to go.
2) Yes, then you need the definition.

Basically, any EFI-SD4xxx hardware will work with any speed density bins with the correct adx/xdf, I think that is correct. Except a manual PCM will not work with an auto, but an auto PCM will work with a manual when told so.
The SD47a is for a six cylinder auto. I am assuming SD40a is a six cylinder manual.
Using A1C, and your SD47 you can tell it what trans your using.

I've read the stock tune off my PCM, without a supported def file, and it has taken me years to understand. Probably spend too much time on these forums than actually tuning my rig. It is a learning curve.

You will need to have your tune file converted which means youd need to be a premium member. Not a big deal since you plan on anyway.

Its exttemely difficult to blow up an engine unless your really trying veey hard to.

OK thanks, I think that clarifies it. The xdef files are specific to the box code, so I can't read mine and expect the A1C xdef to convert it to something intelligible in tuner pro.

Can I at least datalog my ECM using the A1C adx? Or does that require that I be running the A1C bin too?

Also what about the J1X stuff that Efloth posted? I think his truck is a 1991, but it's got the same "EFI-SD40A" label that my ANT1 box does, so I was hoping his xdef, bin, and adf would be enough to allow me to play with mine.

Sorry for all the newbie questions. I do plan to let Decipha do it right, I just want to learn what I'm doing before
it matters.

My concern is specifically the initial break in of the flat tappet camshaft. Need the engine to run at 2000 rpm for 20 minutes immediately upon initial start up without being so rich it washes down the cylinders or so lean it's breaking up or over heating. I'd like to have a good enough understanding of the process of making changes to be able to tweak fueling on the fly if necessary during break in.

The adx xdf and bin all have to match. No reason to ever read the stock tune when using tunerpro other than on eec-v to get the pats code, otherwise its useless since you won't be using it.

As long as you have a functional o2 sensor then it will correct the air fuel ratio to stoich every time. Best to use the stock tune with stock injectors as it wouldn't require any adjustment to do so.

Well that's the issue - the cam is a solid lifter 222 @ 050, 264 advertised duration, .480 lift, on a 110 LSA. Everything I read says the stock speed density won't like that cam one bit.

The head is ported too, pretty extensively, deshrouding the valves enough to probably change timing requirements due to shape of the chamber.

Also the intake is modified (upper is gone, replaced by a box plenum, effectively shortening the runners by about 40%) with a single 70mm throttle body setup from a 1999 5.4L truck. So I'm sure all the transient fueling parameters will need to change a bunch too.

Altogher my guess is that the stock VE table is going to be very lean for the new motor.

What's the turnaround time for making a new def once I become a premium member? And is it ok if it's 6 months later before I'm ready to have it tuned? Hard to predict an exact timeline at this stage of the project......

No new def just need a tune is all no big deal.

No such thing as too big of a cam for speed density thats only for stock tunes.

I should be able to put a startup tune together for you in a couple hours.

Nah theres no time limit on updates. I sent revisions out years later sometimes.

J1X is fully broken out but the ADX still has some minor issues. It would be a good learning tool while you are finishing your build.