VE table tuning in speed density

[Firebird94]

when you post your log, and have have changed your tune, post the tune also.

For verification, how is your MVPIx set up right now? How or what are you tuning, and or trying to accomplish with these logs?

There is more data on 'longer drive to work' and it looks like its using the vehicle O2 sensors?
Then there is the 'long drive to work' and are you using a wideband for that log?

Me, i use the vehicle O2 sensors and try to get the 3500prm and below VE set so its not rich nor is it lean. This is step 1 for me.
Then step 2 is doing the same for the MAF.
I don't do any WOT until those are pretty close to where they should be.

Currently you have some pretty good lean spots that need fuel added, and the circle showss an entire area that we dont know whats happening there.

So, to recap, you stated in your 1st post youre still new to tuning, thats why i wanted to verify so were all on the same page.

I have an MVPI3 and I am trying to tune following Goat rope garages video called GEN 3 speed density tuning. In this he goes over how to force the car to only run on the VE table and not the 02 sensors or the MAF which I followed and then he says to Tune your VE table from there using a wideband sensor and the AFR err table which is what I have been trying to do.

Ill attach here the updated tune file as well as the same "long drive to work log" which would be the corresponding log for that tune. Please let me know if I didn't answer anything. Thanks.

[gtstorey]

Most of the more experienced tuners on here use the fuel trims/narrow band o2's to tune everything but WOT.

[Alvin]

I have not been able to check fuel pressure under WOT yet however with the vehicle idling the fuel pressure at the rail is around 40psi and stays at about 40-45psi when I disconnect the vacuum line to the pressure regulator.

that doesn't matter.. what happens under WOT is what we need to know

[04silverado6.0]

Most of the more experienced tuners on here use the fuel trims/narrow band o2's to tune everything but WOT.

I tune ol wideband and have fuel trims -3 to 0 every time. Ive noticed on cams the switching voltage needs to be lowered to bring the trims back in line with what the wideband reports. A 200k mile set of narrowbands vs my afr500v2 with a calibrated ntk 24301 sensor.

[bk2life]

I tune ol wideband and have fuel trims -3 to 0 every time. ...... 200k mile set of narrowbands

cool story bro

lets see those trims when them 200k NBs are put back into action

-but, if you don't have anything to add to the OPs thread, save the cool guy stories for the porta john walls

[04silverado6.0]

cool story bro

lets see those trims when them 200k NBs are put back into action

-but, if you don't have anything to add to the OPs thread, save the cool guy stories for the porta john walls

Thanks.

[TheGageinator]

Ive been following this thread as I am also trying to get an Lt1 with a 411 swap tuned! How is your progress going? I'd be able to share my tune as well. I think a very important step is having the correct injector data flow rate per kpa

[bk2life]

I think a very important step is having the correct injector data flow rate per kpa

sounds like a bot the way that reads

[horsepowerguru427]

sounds like a bot the way that reads

Agreed.

[bk2life]

cool story bro

lets see those trims when them 200k NBs are put back into action

-but, if you don't have anything to add to the OPs thread, save the cool guy stories for the porta john walls

@04silverado6.0
also i apologize for that response.
was a shitty thing to write.
some days i step on my own d*ck..

[Ratssled]

Hey to a fellow Gen-2 oddball. It may be best practice on this site to ALWAYS identify that you're not tuning an LS engine. Alvin is one of the few that knows us.
Something like this:

Warning: Frankenstein!!!! A GM Gen III PCM talking to a GM Gen-2 engine, Oh My!

Few things I see in the last tune:
Injector data don't look right for a stock LT1; IFR should be 24.9 and Voltage offsets are wrong.
Cylinder volume is smaller than a stock LT1; should be 717.25 ml/Cyl
Airflow: It looks like both the MAF and VE are too high, esp. at idle and cruise.
OL EQ ratio is all over the place, like stock. You're aiming at a moving target.

Also, you can tune VE and MAF at the same time using Dynamic Air and use STFT. The reason people like using the NBO2's is because they're accurate at Stoich, and your goal should be Stoich until you get to WOT.
Don't worry about transients until after the VE and MAF are calibrated. That's in one table under fuel transients. You'll likely never get rid of the momentary lean spike, but you should knock it down fast.

[edcmat-l1]

Hey to a fellow Gen-2 oddball. It may be best practice on this site to ALWAYS identify that you're not tuning an LS engine. Alvin is one of the few that knows us.
Something like this:

Warning: Frankenstein!!!! A GM Gen III PCM talking to a GM Gen-2 engine, Oh My!

Few things I see in the last tune:
Injector data don't look right for a stock LT1; IFR should be 24.9 and Voltage offsets are wrong.
Cylinder volume is smaller than a stock LT1; should be 717.25 ml/Cyl
Airflow: It looks like both the MAF and VE are too high, esp. at idle and cruise.
OL EQ ratio is all over the place, like stock. You're aiming at a moving target.

Also, you can tune VE and MAF at the same time using Dynamic Air and use STFT. The reason people like using the NBO2's is because they're accurate at Stoich, and your goal should be Stoich until you get to WOT.
Don't worry about transients until after the VE and MAF are calibrated. That's in one table under fuel transients. You'll likely never get rid of the momentary lean spike, but you should knock it down fast.

Um, I'm pretty sure he announced in the OP that it was a 94 LT1.

[edcmat-l1]

I tune ol wideband and have fuel trims -3 to 0 every time. Ive noticed on cams the switching voltage needs to be lowered to bring the trims back in line with what the wideband reports. A 200k mile set of narrowbands vs my afr500v2 with a calibrated ntk 24301 sensor.

You've never tuned an LT1 24X setup so you probably should just listen for now.

[Ratssled]

Um, I'm pretty sure he announced in the OP that it was a 94 LT1.

OK, thank you!

[04silverado6.0]

@04silverado6.0
also i apologize for that response.
was a shitty thing to write.
some days i step on my own d*ck..

I have to say i have been using trims for tuning along with a wideband for pe. I am needing a lot less revisions to get a tune dialed in. Cant comment on any difference noticed while driving but makes my job easier since its been high demand. Using the same bank for stft and wb error as well. Ive even turned ltft back on recently on a couple daily driver vehicles.