Head Cam Intake ls1 2002 trans am

[oreobadr]

Just to make sure, this is with the ltft cells changed from like 1100 to 2600 or something like that right?... Not the 6000 and 6001?

Sent from my Nexus 6P using Tapatalk

yeah I changed them to 1400, 2200, and 3000 RPM

[oreobadr]

Oh yeah thanks! That's an important one that isn't very intuitive. It's nice when others confirm what I'm trying to convey/or correct me if I'm wrong,or fill in knowledge gaps.

This has been an awesome thread, although long, I think it details a lot of good info. It's definitely helped me get a deeper understanding of the ls1b cause want to know what I'm saying will help. When I tuned mine, there was a lot of "let's see what this does" type flashing.

And actually oreo, seeing how clean and stable you got your idle has convinced me to go back and redo mine since I'm running hybrid open loop at idle (I clearly don't need to since yours had a larger cam than mine).

Sent from my Nexus 6P using Tapatalk

Thanks man I definitely owe my success to you, Joecar, and Statesman! Yeah my idle is definitely very stable now. It wasnt an easy process but once I found out the base air flow I just modded the decay rates enough to get it where I want it. I am thinking about even lowering it to 800 RPM because I am still not having stalling problems. I also have the FAST 102mm throttle body which I heard of professional tuners not even trying to tune it because of idle problems so I feel pretty accomplished to say the least lol!

[joecar]

+1 statesman said to go OL until you get bank 1 NBO2 fixed.

[Jetmech442]

+1 statesman said to go OL until you get bank 1 NBO2 fixed.

I also agree, but why doesn't his other bank record values? His log shows both LTFT flat-lined, even though the other 02 is reading (albiet not very well).

He also shows OL for sae.fuelsysA the whole log

Sent from my Nexus 6P using Tapatalk

[oreobadr]

If you're going to go this way, yes, correct, disable any NBO2 trimming (see below).

CL: B4205: disable
LTFT: B3801: disable
STFT(OL): B4206: disable
SOL: B3605, B3647: eliminate stoich cells.

I dont have a b3647. What was this supposed to do? Also, for B3605 I just made the highest value .96

[joecar]

I dont have a b3647. What was this supposed to do? Also, for B3605 I just made the highest value .96

GM OS has B3605, this is ECT vs RPM.

EFILive COS replaces B3605 with B3647 which is MAP vs RPM.

[joecar]

You can use 0.98 EQR or 1.02 EQR, these are sufficiently far from stoich to avoid STFT trimming during OL (aka semi-open loop, SOL).

[joecar]

...

EFILive COS replaces B3605 with B3647 which is MAP vs RPM.

which gives much better OL fueling control over the MAP range.

[oreobadr]

which gives much better OL fueling control over the MAP range.

Gotcha thanks.

So I ran some more testing and updated my tune accordingly. I am pretty sure the car does not run lean anymore! It runs really well, idles great, and I think the data is more consistent now that I am only using the wideband.

Now to tackle another issue. I have bucking at 0% to light throttle from 1500-1800 RPM. My timing isnt jumping so what could it be?

[statesman]

Now to tackle another issue. I have bucking at 0% to light throttle from 1500-1800 RPM. My timing isnt jumping so what could it be?

Your cam.... you can try adjusting timing and airflow to minimize it, but some cams just like to buck at lower rpms.