SUB2 stock bin - '95 4.9L E4OD

[Sevensecondsuv]

We were talking about pulling the stock bin off my truck in another thread. I figured I should start a new one. Here it is. Obviously this isn't broken out at this point. Somebody smarter than me will have to do that lol.

The truck this came out of is a 1995 F-150 with the 4.9L I-6, E4OD transmission, 4wd, federal emissions, speed density / batch fire and has the later computer-controlled dwell type of TFI module. The box code is SUB2 / SD-47A.

[efloth]

I have started a list of changed parameters between stock A1C and Michael's tune so we can get a list of parameters that need to be broken out in SUB2

[efloth]

I will update this as I can. Bytes and words for now:

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A1C Address	Parameter Name
	2e68	Ignition Degrees Per PIP - DEGPIP (Unactual)
	43ca	Code Patch
	43e6	Code Patch
	444b	Code patch
	4464	?
	A02C	Code Patch
	a40a	DELHYST - ISCMOD_TPREL Hyst (DELRAT)
	a40c	ISCMOD_MAX - Idle Modulation Max
	a40e	ISCMOD_MIN - Idle Modulation Min
	a410	KDNDT - Idle Mod Gain
	a412	TC_OVER - IPSIBR Delay Idle Over
	a416	ISCMOD_RPM - Idle Fuel Modulator RPM
	a418	PSIBRM - IPSIBR Correction Max
	a41c	PSIBRN - IPSIBR Correction Min
	a41e	ITHBMA - Throttle Body Airmass
	a420	DEBYCP - IAC Min Calc Flow Limit
	a422	DASCTL - Daspot Max to allow Idle Control
	a424	DASPTK - Dashpot Gain
	a426	DELHYS - Dashpot TP
	a428	RPMCTL - Idle ISC RPM Control (FBS Startup) (ISCFLG)
	a434	UPDATM - ISCKAM Correction Rate
	a435	MINMPH - Idle Control Max MPH
	a440	~IS_NUBASE - NEUTRAL IDLE RPM (NUBASE)
	a442	~IS_DRBASE - DRIVE IDLE RPM (DRBASE)
	a446	BZZRPM - Startup RPM Adder
	a454	TKDTN - Kick Down Time (FN826B) (TKDTM)
	a455	BZZTM - Startup RPM Adder Time
	a458	Failure Default RPM (NUBASE)
	a81c	IPSIDLY - IPSIBR Update Crank Delay
	a820	SETLNG_TM - Idle Disturbance Delay (Dashpot Settling Time)
	a822	AHISL - Injector High Slope (K-Constant)
	a826	OPCLT3 - CL Delay Hot
	a831	OPCLT4 - CL Delay Cold 2
	a832	OPCLT5 - CL Delay Warm 2
	a854	?
	a856	Lambse Base in OL ?
	a858	MINPW - Injector Min PW Clip
	a85a	PIPOUT - Number of Pips Between Injector Outputs
	a85c	INJOUT - Injectors Per Output Port
	a868	NLMT - Rev Limiter
	a86a	Rev Limiter Hyst
	a86c	VSLIM - Vehicle Speed Limiter
	a86d	MPH for Fuel Cut OFF Hyst
	a87a	WOTRPL - WOT Lambse Time Modifier RPM Min
	a890	DFSECT - DFSO ECT Min
	a89e	Idle Spark Min Something (maybe tq)
	a8a2	~SPK_FBS_MIN - Idle Spark Min Clip (1 of 2)
	a8a4	Idle Spark Max Something
	a8a6	Idle Spark Min Something
	a8b0	SPKCTL - SPK_FBS DSDRPM Adder Max Clip (Idle Spark)
	a8b4	SPKINU - SPK_FBS Neutral Target Idle SpkAdv
	a8b8	?
	ac3e	CTHIGH - Hot Start ECT Min (OPCLT3)
	ac3f	CTLOW - ECT Threshold Cold (2 of 2) (OPCLT)
	ac40	?
	ac41	ENGCYL - # Pips Per Rev (NUMCYL)
	ac46	~MHPFD - Signature PIP Difference Value
	ac52	BASEMD - Engine Volume Liters (SARCHG) (cubic inches) (Idle Stability)
	ac58	DELTA - PT Threshold
	ac5e	THBP2 - WOT Threshold
	ac76	ISCDTY Default

[Sevensecondsuv]

Wow thanks!

To be fair, Michael didn't make a lot of those changes, I did. Mostly trying to see what parameters would produce a noticeable change in idle performance. I.e. the trial and error method of tuning.

I would think the bare minimum to get started tuning SUB2 would be access to the VE table, injector slope and offset, and the spark table. Beyond that it'd probably be helpful to have trans type (since SUB2 is for E4OD and I'm running a stick), FN800, FN875, ITHBMA, Dashpot stuff, NUBASE, and the open loop fuel table.

[wwhite]

I should post my SD48 that is nearly 100% broken out. Just needs ADX.
I think it is LADx that is the newest version of code, 1996. That would be best.
But A1c works on sd20, etc, happens to work on SD4x, with bugs.

[efloth]

Cool. Do you know what type of TFI module it is set up for?

[wwhite]

SUB2_cmt.txt

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3400 # 0 = Thick Film Ignition (TFI)
41f3 # Indicator of ignition type
41fa # 2 = Low Data Rate Distributorless dual plug (LDR_DIS)
a36f # 1 = Thick Film Ignition - Improved Computer Control Dwell (TFI_ICCD)

SUB2_dir.txt

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ca17: 01                  byte      1            IGN_TYPE

From what I can tell, it is TFI_ICCD.

[wwhite]

Cool. Do you know what type of TFI module it is set up for?

SUB2, KID2, LAD1 all set byte 1 (TFI_ICCD)
A1C and J1X set byte 0 (TFI)

[efloth]

So do you guys want to focus on Sub2 then or adapting LADx? We could add the extended VE patch/datalogging to either one. SUB2 would take longer. Either way we should get a copy of your A1C tune that was only editied by Michael

[Sevensecondsuv]

I can try to post the latest Michael tune later. I will note that it ran worse than the later one I posted. Mine at least has the VE table very close.

As to which strat to start with, I'm assuming LAD1 is off a V8 strat? While either one should be fully compatible with the SUB2 hardware SD-47A, I'm thinking there's going to be a LOT less tuning required if we start with SUB2. There's obviously a lot of differences in the tune between 6 cyl and 8 cyl.

All that said, I've never tried to break one of these out, so I don't have a good feel for how much work we're talking about. It's not lost on me that strangers are volunteering their own precious time to help me with this. For that reason, I'll be extremely grateful for whatever help/time you are willing to put in.