496 BBC Using 0411..... 8.1 Tune?

[123pugsy]

I have a 496 block coming from the machine shop soon. I will assemble it and spark her up on the stand.
I have 24x crank reluctor and 1x cam sensors.

My 0411 is from an Express Van with only 1 coil. I will be using 8 of course.
I want to prepare my harness now so I can clip it on and do my start up.

Should I flash an 8.1 tune to the ECM and change the firing order?

I need to figure out pin outs for the harness and which diagram to follow.

[04silverado6.0]

Is there not a 454 that was 0411 controlled? I know the 350 made it into 02ish. I believe the table for firing order is only for misfire detection. Someone with user defined parameters may be able to change the firing order in the background(me).

[123pugsy]

I don't think so any 454's on the 0411. I have a 1998 Vortec 454 I'm stroking and that came with a dizzy, not coils for every spark plug. I got an 0411 ECM and harness currently from an 01 Express van, which has only one coil wire as well as it's also a dizzy.

So, what I need to know is if I add 7 wires to the ECM for 8 coil packs, is the signal already there, just not being used when it's a dizzy vehicle? Or, do I need to re-program by copying a tune from a vehicle that was using coil near plug? I'm sure this method will burn 4 credits, but that's OK of course.

If I copy a tune, will I need to use the pin outs associated with the vehicle I copy? I'm finding differences on many pin out diagrams that are for 0411 ECM's.

[blindsquirrel]

I think if you are using LS crank/cam sensors and LS coils and LS whatever else, you'd be better off starting with a LS base file. Just change the firing order (ECM 14000) and injector bank select (ECM 12301) to make everything line up. The parts of the OS you can't change thru regular tuning stuff doesn't need to know that the engine it's connected to has siamesed intake ports, or that the cylinder heads are iron, etc.

Many PCM pins are software-assigned, meaning different OSes may have things connected to different places even though the PCM hardware (service number) is the same between them. Use diagrams/pinouts for whatever year/make/model's OS you choose. There is no one single diagram for "an 0411".

[123pugsy]

Thanks. Will pick a tune that I can find a good diagram for as I believe this to be of utmost importance.
Will need to be a drive by cable system.

Dizzy is now a cam sensor, 1X, and I have a 24X crank reluctor.

[blindsquirrel]

...or an 8.1 base file, with the same firing order/injector bank changes. From what I can see in the service manuals the 8.1 reluctor is the same as the LS.

Where is your 1x cam sensor gonna be taken from, cam sprocket or a distributor? edit: answered while I's procrastinatin'

[blindsquirrel]

Do the smart thing and buy a subscription at alldatadiy.com, that way you can get good diagrams for anything you end up with and don't need to limit yourself only to what's been put up online for free.

[edcmat-l1]

Yeah I'd start with a P59 and 8.1 calibration.

[123pugsy]

Thanks.

8.1 has a different firing order, but that is easy to change, I think?
Just use HP Tuners to change it?

I found some tables for the 36 LB GTP injectors I have, so just copy and paste those?

[blindsquirrel]

firing order (ECM 14000) and injector bank select (ECM 12301)

In the editor, type CTRL+N. Type in '14000' or '12301'.

[123pugsy]

Thanks.

Really? There is a place to type?
Never seen a typing window before.

I know how to click stuff.
I found system and firing order. Looks easy enough to change that.
I also found ETC where I could change to 0 for drive by cable? I think.

I found 12301. Is it Injector bank Select?

[edcmat-l1]

Thanks.

8.1 has a different firing order, but that is easy to change, I think?
Just use HP Tuners to change it?

I found some tables for the 36 LB GTP injectors I have, so just copy and paste those?

Same as the LS. If you wanna get fancy order a 7-4, 2-3 swap cam and BOOM, LS firing order.

[123pugsy]

Same as the LS. If you wanna get fancy order a 7-4, 2-3 swap cam and BOOM, LS firing order.

Thanks.

I was looking at the firing order of the Express Van tune and seen old school firing order.
I have a 5.3 swap in my El Camino and didn't even realize the firing orders had changed after the SBC.

I wish I had of realized this before ordering my cam.

For that, I can make up my wiring harness to suit for the coils and injectors, keeping this in mind when diagnosing misfire issues.

[123pugsy]

I was going thru pin outs for 02 F body because I read of guys were using that OS, and hit a snag with the front VSS. I'm running a 4L80e. The F bodies must have only come with 4L60e's?

I guess that's why I read that guys were using truck tunes. Need a tune from a truck with drive by cable, coil near plug perhaps.

[04silverado6.0]

Like i said above, the "firing order" table is only for misfire detection.

[123pugsy]

Like i said above, the "firing order" table is only for misfire detection.

Thanks.

Didn't understand what you were saying.
So the computer uses that table to isolate the issue?
Not to tell the coils when to throw a spark?

[04silverado6.0]

Here is one parameter you will need access to. I remember seeing a table for cylinder number vs coil pack.

[04silverado6.0]

Many tables in the background to change. Im not sure i have definitions for all of them. Still cannot find the xdf with coil vs cyl. Not counting multiplier tables for knock sensors and probably some others.

[123pugsy]

Here is one parameter you will need access to. I remember seeing a table for cylinder number vs coil pack.

Thanks.
Yep, found that.

Also, research has me at now using an 03 Express Van tune as GM still has it as DBC with the CNP.

I got All Data diagrams for the 03 as well, so I believe I'm good to go to get my harness cobbled for test stand running. I will do a permanent job on the harness later as I believe I will receive a few frowns with the volume of wire nuts coming up, ha.....

I will simply run the wires to the appropriate coils and injectors.
7/4 and 2/3 swaps.
When diagnosing issues, will have to remember the changes.

[Alvin]

I have a 496 block coming from the machine shop soon. I will assemble it and spark her up on the stand.
I have 24x crank reluctor and 1x cam sensors.

My 0411 is from an Express Van with only 1 coil. I will be using 8 of course.
I want to prepare my harness now so I can clip it on and do my start up.

Should I flash an 8.1 tune to the ECM and change the firing order?

I need to figure out pin outs for the harness and which diagram to follow.

Have you looked into EFiconnection?

I did a 502 Ramjet with a early setup that used a distributor and 411 then we redid it a few later with coil per cylinder. It ran on a C5 vette OS. Just an option if you haven't seen it already.