1228746 with TBI 5.7

[bennettcvcu]

Hi all!

I'm new to the data logging world as of today. Today was the first day I plugged into my 5.7 TBI. Sitting in the drive way while in park and at idle, here was the data log I was able to record. Worth noting that the base time has been set to 11º advanced.

I do plan to take it out and complete future logs under different drive conditions. In the meantime, I was wondering if anyone had any advice for a newbie on the attached? Does something look off? Is there something I should address first?

Thanks!

Chris

[bennettcvcu]

Was able to do a pull today in gear while in close loop. I also bumped the timing down to 10º advanced.

Any suggestions would be greatly appreciated. Car runs good but always looking to make it better.

Thanks,

-Chris

[stew86MCSS396]

Most of us here are just hobbyist here...normally when you ask to take a look at your data logs, you should provide the data acquisition file (.adx) that you used to acquire your data log. Some of us may ask for the .bin and the .xdf you're using as well considering you may be running an L05 in a platform that never came with that engine.

What little I could surmise...seems to creep up a little rich in park but in drive it'll stabilize near ~128. Did you disconnect the EST when you adjusted the timing in the second log and reset the CEL after as you're showing a error code 41.

[bennettcvcu]

Most of us here are just hobbyist here...normally when you ask to take a look at your data logs, you should provide the data acquisition file (.adx) that you used to acquire your data log. Some of us may ask for the .bin and the .xdf you're using as well considering you may be running an L05 in a platform that never came with that engine.

What little I could surmise...seems to creep up a little rich in park but in drive it'll stabilize near ~128. Did you disconnect the EST when you adjusted the timing in the second log and reset the CEL after as you're showing a error code 41.

Thanks for the feedback for a newbie - much appreciated!!

I noticed that too about the O2 reading creaping up in open loop at start up. Not much I can do there right?

You were correct - I did not clear the code after resetting base timing . Since then, I have and was able to complete some more pulls. Attached is my latest. As read in the xdl file I did replace a bad check valve that provides vacuum to the vacuum tank and HVAC controls. It wasnt leaking but would allow manifold pressure at all rpm's to affect this circuit.

Again, appreciate any feedback at all to help me learn

[bennettcvcu]

GM all.

I was able to do a log in winALDL and noticed that my knock sensor reads 6 for several minutes and then changes to 7 towards the end. It almost seems like somethings wrong as I would expect to see more changes over time (real time knock counts) under real world driving conditions. Would this appear to be correct (working as intended) or should I dig in further?

With a constant 6 or 7 on the knock count I'm guessing somethings wrong with the circuit/hardware and thus its retarding my timing always and I should be troubleshooting further?

Thanks in advance,

-CB

[dave w]

Hi all!

I'm new to the data logging world as of today. Today was the first day I plugged into my 5.7 TBI. Sitting in the drive way while in park and at idle, here was the data log I was able to record. Worth noting that the base time has been set to 11º advanced.

I do plan to take it out and complete future logs under different drive conditions. In the meantime, I was wondering if anyone had any advice for a newbie on the attached? Does something look off? Is there something I should address first?

Thanks!

Chris

Datalogging is a good first step. Are you able to reprogram PROM Chips?

[bennettcvcu]

Datalogging is a good first step. Are you able to reprogram PROM Chips?

Not at the moment. I really need to learn more before I even attempt to change something. Hoping to learn as much as I can here and other places.

-Chris

[dave w]

Chip programming is often required with engine performance upgrades.

Chip programming is often required if the data log shows the BLM averages are lean or rich.

The ideal BLM average is 128.
BLM averages below 128 are rich.
BLM averages above 128 are lean.

BLM averages above 138 require chip programming.
BLM averages below 118 require chip programming.

TunerPro RT BLM History (Fuel).jpg

[bennettcvcu]

Chip programming is often required with engine performance upgrades.

Chip programming is often required if the data log shows the BLM averages are lean or rich.

The ideal BLM average is 128.
BLM averages below 128 are rich.
BLM averages above 128 are lean.

BLM averages above 138 require chip programming.
BLM averages below 118 require chip programming.

TunerPro RT BLM History (Fuel).jpg

Thanks for the feedback and time takin!

Interesting... My BLM Histogram suggests otherwise These readings were compiled from my last three runs at the same base timing (10º advanced).

Regarding hardware, I have a crate 350 long block 4 bolt main that I bought from GM and put in 24 years ago. So stock heads, air cleaner and inlet w/ preheater hose on it. It’s got about 64,000 miles on the clock backed with a 700R4. I’m running an Edelbrock performer intake with a TBI adapter plate and 1.5” riser. I have Hedman shorty headers to a wye pipe with a self-gutted Cat to a 3” cat back flow master kit. It no longer has the air pump and the air tubes have been capped. The EGR valve has been replaced and recently tested. It has a stock ECM of 1228746 w/ ATCR. I changed over the typical 305 to 350 conversion items to include the ESC module, knock sensor and fuel injectors to the orange/black. It has the original EST module, dizzy, coil with an Accel distributor and wires.

I’ll continue to let it run where it’s at as I backed the timing down to 6deg bTDC yesterday and reset the ECM. Once it’s had enough time to dial in its BLM and INT, I’ll reassess.

Assuming the programs good would there be something mechanically that I should look at?

Any other suggestions on items I should track like BLM averages, etc? Are there any TBI 5.7 XDF's that folks have created other than the freebies available someones willing to share?

Thanks in advance,

-Chris

[stew86MCSS396]

Thanks for the feedback and time takin!

Interesting... My BLM Histogram suggests otherwise These readings were compiled from my last three runs at the same base timing (10º advanced).

Regarding hardware, I have a crate 350 long block 4 bolt main that I bought from GM and put in 24 years ago. So stock heads, air cleaner and inlet w/ preheater hose on it. It’s got about 64,000 miles on the clock backed with a 700R4. I’m running an Edelbrock performer intake with a TBI adapter plate and 1.5” riser. I have Hedman shorty headers to a wye pipe with a self-gutted Cat to a 3” cat back flow master kit. It no longer has the air pump and the air tubes have been capped. The EGR valve has been replaced and recently tested. It has a stock ECM of 1228746 w/ ATCR. I changed over the typical 305 to 350 conversion items to include the ESC module, knock sensor and fuel injectors to the orange/black. It has the original EST module, dizzy, coil with an Accel distributor and wires.

I’ll continue to let it run where it’s at as I backed the timing down to 6deg bTDC yesterday and reset the ECM. Once it’s had enough time to dial in its BLM and INT, I’ll reassess.

Assuming the programs good would there be something mechanically that I should look at?

Any other suggestions on items I should track like BLM averages, etc? Are there any TBI 5.7 XDF's that folks have created other than the freebies available someones willing to share?

Thanks in advance,

-Chris

Your list of engine specs is how every thread should start...keeps all of us that are trying to help from trying to guess what we are chasing. If anything has been changed from stock as dave w cited PROM tuning is beneficial. Dave w screen shot of the BLMs isn't your datalog but just a representation of what a untuned fuel map will look like in a datalog.

I didn't respond sooner being the variations $61.ADXs that I could find on the net...they seem to be a little lacking (not trying to belittle anyone's hard work that went into it) and for the life of me, I couldn't get the histogram to work.

I use Pennock's Fiero aldlview to peak at winaldl logs and attached a screenshot of your log which could use some VE table tweaks.
bennet winaldllog.jpg

[dave w]

The 1228746 is not a popular TBI computer, mostly because it's SUPER SLOW at 160 Baud rate. The 16197427 is a very popular TBI computer because it's 8192 Baud rate and Air Fuel Ratios can be streamed into the data log. Possibly upgrading to the 16197427 is an option?

Off Idle.jpg

[stew86MCSS396]

I don't disagree but I still don't mind using them...I've worked with the 160 baud ECMs and to get useful data I'd recommend you get a nice 30 min log to manipulate. The 8192 stuff you could possibly drive around a long block and acquire useful data for tuning.

[bennettcvcu]

I don't disagree but I still don't mind using them...I've worked with the 160 baud ECMs and to get useful data I'd recommend you get a nice 30 min log to manipulate. The 8192 stuff you could possibly drive around a long block and acquire useful data for tuning.

I agree. These short runs and with all the recent changes to timing and resets, likely not enough to really surmise what normal is. A early hunch is that its a little lean 1800 rpm and higher (see image attached) from data pulled today (short runs).

Could is be fuel pressure (never checked it) or something else? Perhaps tuning is required.

Thanks a bunch as this is really fun for me and learning loads!

Much appreciated

-Chris

[dave w]

I agree the 1228746 .adx is not optimal.

The 16197427 has a very good .adx file.

Knock Retard.jpg

The 1227747 has a very good .adx file too.

TunerPro RT Dash.jpg

[dave w]

I agree. These short runs and with all the recent changes to timing and resets, likely not enough to really surmise what normal is. A early hunch is that its a little lean 1800 rpm and higher (see image attached) from data pulled today (short runs).

Could is be fuel pressure (never checked it) or something else? Perhaps tuning is required.

Thanks a bunch as this is really fun for me and learning loads!

Much appreciated

-Chris

Lots of good 1228746 TBI information here: https://www.thirdgen.org/forums/tbi/...rting-tbi.html