closed loop Lterm BLM's 120 help

[halfazn]

using datamaster to log my tune i found something wrong.

Lterm BLM's are comming in at 120, but the Sterm are balanced out at 128. I don't have exhaust leaks.

Please look at my datalog and help me to pick it apart. I have blended the table in vemaster, and am waiting to upload it to see if the patch has brought me closer to 128.

below are my VE tables: starting from 20kpa up to 65kpa in increments of 5

36.3 39.5 40.6 42.2 45.3 48.4 48.8 51.2 53.9 55.9
40.2 43.0 44.5 46.5 49.6 53.5 53.9 56.3 59.0 61.3
42.2 45.3 47.3 49.2 52.7 56.6 57.0 59.8 63.3 64.8
44.9 48.8 50.8 53.1 56.6 60.9 62.1 65.2 68.4 69.5
47.7 50.8 53.1 55.5 59.4 63.7 65.2 68.4 71.1 72.3
47.3 52.3 55.5 57.4 60.9 65.2 66.4 69.1 71.9 73.4
50.8 54.3 56.6 58.2 61.7 66.4 67.6 69.5 71.9 73.4
52.7 56.3 57.8 59.8 62.5 67.6 68.8 70.3 72.3 73.8
56.6 60.2 62.1 64.1 66.8 70.3 73.0 74.6 77.0 78.1

My question now is how do I get my BLM's to balance closer to 128 and not a lean 120? Thanks in advance

[halfazn]

I am unable to upload the .uni file but can email if requested. New to forum and 1st day tuning and logging. Thanks

[dave w]

I am unable to upload the .uni file but can email if requested. New to forum and 1st day tuning and logging. Thanks

Welcome to tuning. We all beginners at one point. The .uni file can be attached, but needs to be attached as a zip file. We will need to know what definition file the .uni file is.

dave w

[EagleMark]

Tell me what size the DataMaster .uni logs are and I'll add some room and make them attachable.

[RobertISaar]

120 isn't too bad, and it's actually indicating that your table is slightly too rich.

[halfazn]

I have ziped both bin files and uni files, for reference. The only changes Commanded that will be different in the bin file is idle settings. I figured out how to change that last night. The uni file is from datamasterEE 4.0, and the bin file is from tuner cats.

Correct me if I am wrong but I read BLM < 128 was lean and BLM >128 was rich? I may be reading it wrong though.

My engine bolt ons are as follows.

95 Impala SS, CC502 218/224 112 lsa, 1.5 roller rockers, mid length headers 1 5/8 primaries, full 2.5" cat back true duals w/ H pipe, cai, 2200 lockup stall, 3.73 eaton posi rear gear, unmolested iron heads, MSD opti, MSD coil, LT4 knock module.

Thanks

[dave w]

I'm booked solid today with things to do. I'll take a look at the attached files late tomorrow afternoon. Less than 128 Rich / more than 128 Lean.

dave w

[FSJ Guy]

120's are rich. Not too rich, really, but rich.

Remember, that doesn't mean that your ENGINE is running rich. It just means that the fuel table you have programmed is too rich and the ECM is pulling fuel in order to make the engine run at the correct mixture.

Hope that helps until someone can look at your logs.

[EagleMark]

128 is perfect but in real world you can not obtain this perfectly every day. Even if you get 128 everywhere today when weather chenges so will it. So it's a number to shot for and be close to.

Higher then 128 is lean adding fuel
Lower then 128 is rich taking away fuel.

Most all of your log the car is not warmed up so will be adding fuel/choke. Begining of your log is still open loop so BLM is not in effect. When you get to end of log in closed loop, coolant temp still rising you are running pretty good.

Logs should be started after car is completly warmed up and even driven a little. Want a perfect log for starter VE table then do that then, turn off car, discconect batterey or pull PCM fuse for a miute to clear BLM learn, start car, wait for closed loop and then log! First five minutes will be what you base your VE table at. Ooops! Gave away a secret...

[halfazn]

Thanks, that makes sense. I will try the reset BLM learn tip out. How do i make the car more responsive off the line. If I give more than 25 percent travel from a stop it bogs small audible pops then finnaly takes off?

[EagleMark]

This is probably from the cam change. Normally this is an adjustment to AE, Aceleration Enrichment, like a accelerater pump on a carb. But with the LT1 being a MAF system it would be in the MAF Sensor Calibration measuring air entering the motor after your VE tables are in order. I have tuned an LT1 with cam simalar to yours in SD mode and MAF calibrations untouched with no issues, I'm glad to becuase I do not know correct procedure for tuning MAF calibrations?

Sure you got good seals from airbox through MAF to intake?

I don't know of anything here on tuning MAF? What I was going to do was look at Thirdgen.org for tuning the $6E which is MAF only, no MAP sensor, no SD Speed Density to learn more on MAF tuning.

[RobertISaar]

MAF still uses AE, it's slightly different in how it operates though. obviously no D-MAP component. the later stuff that mixed both S-D and MAF... no idea, i've never played with them.

[EagleMark]

I can't find a parameter for it in the XDF and have not had time or need to see if it's available in hack? Can't find any AE in TunerCat either? With that have been told it was dependent on MAF Calibration. Airflow change = Fuel change...

[RobertISaar]

in $EE? that is possibly one of the least completed XDF/TDFs out there in terms of stuff that's actually in the calibration compared to what is defined.

5B is a good example of MAF in that era. only used in 94-95 3800 cars/vans, some supercharged, most not, but they all use high frequency MAFs and no MAP sensors. it's XDF has accell enrich stuff defined.

[halfazn]

I have everything buttoned up pretty tight vacume wist intake through throttle body. I have run the VE calibrations made from vemaster into my PCM and have it looking a little closer to balanced than lean. New logs and tune update posted. I made idle adjustments to 700 from 750 get my lope back once the engine is warmed and in closed idle. I do not know how that effects my MPG setting it lower, but I love the sound.

I am looking around to see what other people have done to get the snappy throttle response while running cam. It bugs me when I step on it from a stop and it bogs. I hope that once I dial in my VE tables that I can take that step.

I am going to play around with my transmision to see how to firm up my shift points while not in PE mode. It used to shift nice and hard from 1<2 gear from part throttle. It feels smooth and slushy right now.