Speed Density VS MAF

[joecar]

setting B6614 to zero:

ok, thanks, I'll keep this in mind.

[Tinbender59]

previous post got clipped-probly my fault ..anywho...-I helped my buddy with a 2006 8.1L Sierra. We found a weird issue with table B6614 where it was set to +640, which in other model years meant no torque reduction. But in this particular year it pulled nearly 50%! Setting it to "0" allowed th ethrottle blase to open 100%(instead of just 53%). the truck would now roast tires without hesitation. Not sure if it will help on your model year, but thought I'd bring it up for you to look at.

Also, I can't stress enough wiring the LC2 exactly as Innovate says, with the relay and everything to the battery. I have the same WB and it's great, but other system noise will easily corrupt the signal and your tune will never converge to stability.

Yeah, theres a lot to learn and read and re-read, I was there a few years ago, but it's well worth it and totally addicting.

Good to know stuff, thank you. My 8.1 is sporting a cable TB?? Should be interisting!! Lol.

Later today I'll post the start tune that I created with the help of LEXTECH, basically a 6.0/4L80E tune, that I copied every line dealing with the motor out of the stock 2004 8.1 tune line by line. It took a bit of time. Lol

[Tinbender59]

If any one would like to see what I'm building? Look here - http://www.silveradosierra.com/under...d-t593361.html

[Tinbender59]

My home brewed tune, if someone would like to critic it I would welcome any suggestions. I do however have a question in Injector flow rate.

I cant find any data that makes sense, what should I put in there?? my 8.1 is completely stock, with vacuum referenced fuel pressure, (has a vacuum line going to the regulator on the rail)

NEW_BIG_TRUCK_0000.ctz

[Tinbender59]

I was comparing the tune to the factory 8.1. Wow it is a mess, I guess I'll spend some more time on it, lol. I have a good tune for the 411, and a 411 with licence, May go ahead and pop that one in for now. With the 1MB ECU I am having some weird dash issues. No 4X4 light, gear indicator changes how it acts with every start?? I did prove that 4X4 is working?? Also dead in the water until the new diaphragm for the regulator shows up, kinda leaking - "bad".

[Tinbender59]

Well it appears that I have a small problem with my tune, it is not going to do what i want. With that said does anyone have an idea where i can find a DBC 4X4 4L80E tune for the 12586243 1mb ecu? motor size is not important

[joecar]

My home brewed tune, if someone would like to critic it I would welcome any suggestions. I do however have a question in Injector flow rate.

I cant find any data that makes sense, what should I put in there?? my 8.1 is completely stock, with vacuum referenced fuel pressure, (has a vacuum line going to the regulator on the rail)

NEW_BIG_TRUCK_0000.ctz

With MAP-referenced FPR do this:
- temporarily remove reference hose (leave FPR open to BARO);
- measure rail pressure (aka "base pressure"), should 58 psi +/-1 psi;
- if FPR is adjustable, adjust rail pressure to 58 psi;
- remember to reconnect reference hose.

note: some vehicles run base pressure other than 58 psi.

Measured base pressure is used to scale injector flow rate.

Also note that with MAP-referenced FPR/rail pressure, the IFR is flat (same value in all cells).

[Tinbender59]

I have a couple of new problems, my gear indicator is not working correctly reads R, D, and 2, and the 4x4 light does not illuminate but it is in 4x4?? hum??

[joecar]

Post your original tune, and your current tune ( is this it: NEW_BIG_TRUCK_0000.ctz )

What segments did you swap, and from where...?

[Tinbender59]

here is a better tune NEW_BIG_TRUCK_0001.ctz

on this tun I started with a 6.0l 4X4 4l80e , told it that it was not DBW, and then pulled all motor data, line by line, from the original 8.1l ECU that was different than the 6.0l into my tune. I did find injector data in another tune. should work better, "I hope" as soon as the diphram for the regulator shows up Ill find out