BBCpoweredZ28

iTrader: (3)

I have the 8496 iirc and a harness from an early 2000 truck with 5.3 for my swap.

I've read that I need to reflash my ecm to the 0411 OS.

Questions is, when I clean up my harness for a standalone barebones setup, do I repin it back the the 8496 diagram, or to the 0411 diagram?

Or can I just use the 8496 OS? Eventually I would like to go to the Holley ECU, but obviously want to get the car running driving before I do that. Won't be going too crazy with the setup til I get everything figured out then eventually a S480 and if I need to go 0411 OS and pinning I'd like to do it while I have everything apart.

Thanks

Pocket

iTrader: (24)

Same pinout for both PCMs. 0411 is a newer and more common version of the same thing. IIRC, the 0411 may have a little more memory, but you'll never need it until you get to split OS and theres only a handful of cars in the country that use that

Why change control systems to holley? OEM is more than capable of handling your turbo 5.3

customblackbird

iTrader: (15)

I agree with pocket on the ECM, stock is much better over the Holley for mild applications. Not to mention hella cheaper.

Question tho, my 5.3, harness and ECM are from a 99 Silverado. How do I know what ECM I have? I got my HPT pro this week and have most of the harness worked out and converted. Their are a few wires I'm confused one. One being the Brake switch wire? I left it pinned in but do I need to connect that!? I'm running a 2004r with an independent tq converter lockup so in not totally sure if this wire is needed. Also the tach signal wire, forget which one that is but it's at half signal right? So I will need to program my speed hut speedo for a 4cyl to work right?

BBCpoweredZ28

iTrader: (3)

Eventually going to the Holley once I reach the limits of the OE computer, plus the ease of tuning without having to buy credits on HPTuners. It'll eventually control boost, fuel, timing, trans brake Etc. That'll be a good ways off tho so no time soon.

Hell HPTuners initial cost is half of a Holley HP setup.

customblackbird

iTrader: (15)

Yea the credits suck. The HP will not support all of that. I though too of getting the Holley HP and called Holley to verify its what I needed and he said I needed to go to the dominator setup. All I planned to run was boost, fuel, timing and water/meth. He said the HP didn't have enough drivers/inputs for everything. The cost of the dominator ECU is over 2k, the harnesses etc put it over 3k I think. HP is basically good for a normal NA setup.

Call Holley and price it out... U will be surprised

Pocket

iTrader: (24)

If its a red/blue PCM from a truck, then its more or less the same as a 0411, same pinout too. Only red/blue oddballs were 97-98 F/y-bodys and they look different from any other PCM

The brake switch wire is the PCM input for when you hit the brakes, PCM commands TC unlock. If you're not running a trans ending in E, this is not required. R10 wht, tach will output 4cyl mode for all LS vehicles from the factory. Its a simple value change in the PCM to correct to V8 output or leave it and reprogram the gauge

Rule of thumb for tachs: if the tach has NO reading, you need a booster. If it reads wrong, then the output needs to be changed to match the gauge

customblackbird

iTrader: (15)

Thanks pocket. Yes, it's the red and blue connectors and the harness/PCM is from a 99 Silverado. Quick question. Going to be finishing the standalone harness within the next couple of days. What is the thick purple wire for? Is that the control for the starter solenoid wire? I wanna say it's like a 12-10gauge and goes to the same large black plug that has all the switch 12v for the injectors etc and PCM power?

I ask because I currently use a remote solenoid to activate the starter and I'm not sure if I need to use the purple wire or just cap it off. Since my solenoid gets activation (switched 12v) from the key being turned currently do I even need the the purple wire in the LS harness?

So currently my key would kick the motor over and the PCM would take over from there. Or does the LS purple wire need to be in contact with the starter solenoid?

Pocket

iTrader: (24)

Thats the starter solenoid wire and yes it functions the same. If you already have that wire covered in the original wiring then remove/ignore it