Wot afr

[andysc3]

I cant seem to nail down the WOT AFR. I changed all of the PE modes to 12.5. On my logs its still commanding 11.3. Can someone look at my tune and see if they cant find what Im doing wrong. Thanks
1254612547

[maudyZ28]

just had a quick look and your tune seems set up fine. VE table and MAF look good, maybe the MAF should be a bit more smooth as the dip may cause problems.

It looks like the AFR is fine until half way through. I'm wondering as your parameters can activate Piston protection mode if this is an issue? Maybe set the parameters such that it doesn't activate and see if the AFR commanded stays constant at 12.53. eg set B3653 to 7000 rpm. I'm also wondering why your spark advance goes upto 30* when you are only commanding 27.7* max ? at this point

[superwagon]

I don't see your tune file?

[andysc3]

I cant seem to nail down the WOT AFR. I changed all of the PE modes to 12.5. On my logs its still commanding 11.3. Can someone look at my tune and see if they cant find what Im doing wrong. Thanks
Tune:12546
Log:12547

Here you go

[superwagon]

I only have the demo version of efi so I am not too good at navigating. I have HPtuners and am saving up to purchase efilive. I thought maybe COT and see yours is enabled but I don't see a lambda adder or anything like that in the tables? Maybe you could disable COT and make another pull and see if it comes up again?

[andysc3]

I had cot disabled when tuning the ve tables. It was still commanding 11.3 at wot.

[joeygc5]

Whats with the wideband reading staying stationary at 15.6-16 afr? What are you using now as a pressure regulator since swapping to the nnbs 90mm intake?

[andysc3]

not sure. Im starting to think that my MAF needs to be re-calibrated.
Also, for some reason my afr gauge reads different than the scanner. The scanner reads about 1 higher.

[Gregs]

the only thing i can think of is that its either piston or engine protection mode. I would experiment on those tables and figure out if either one of them is messing with you fueling.

[joeygc5]

the only thing i can think of is that its either piston or engine protection mode. I would experiment on those tables and figure out if either one of them is messing with you fueling.

Commanded and actual appear to be very far off though. If piston/engine protection mode were in use wouldn't the feedback readings be well into the rich state and not just the commanded value? Does the truck seem to stumble when going into pe or does it feel fine?

[andysc3]

Truck feels very strong throughout the pull. It ran a 13.2@100 last time I went to the track. Not bad for a 5200 lbs brick.
Im using a fuel filter from a vette to convert the ruturnless rails on the intake to the return fuel lines. Its regulated to 60#

[joecar]

Andy, your IFR is for a un-referenced FPR (returnless)... are you saying that you now have a manifold-referenced FPR...?

[andysc3]

No, Its a non-refrenced frp. Its a contunious 60#. stays steady through all pulls.

[joecar]

Ok, I was just sanity checking.

[andysc3]

Engine protection was set to 10.8, I moved it to 11.3. If the Maf was off, would that cause the commanded afr to change? I'm going to a test and tune tonight. I'll do some logs and tweak the tune as much as I can.

[joecar]

Commanded AFR is whatever it is set to by whichever table is active (i.e. commanded AFR is independent of airmass/airflow).

Measured/wideband AFR will match commanded AFR if the sources of airmass are correct (i.e. if VE and MAF tables are correct)... this is what BEN=1 indicates.

[andysc3]

I looked at all of the tables that I can think of. None of them are commanding 11.3 afr.

[maudyZ28]

andy,

I also found it strange in the tune that no where are you commanding 11.3. but as per my first post and what Gregs said Piston protection is still active. Maybe this and some other multiplier are causeing the commanded to be 11.3 ? set B3653 to larger than 7000 rpm to ensure piston protection cannot become active and see if your commanded stays at 12.5 as requested in PE only mode.

Once the commanded is solved then you can do the autop maf or auto ve to sort out the airmass as Joecar talks about.

your tune does look nearly there but when commanded values are changing its hard to set the airmass correct if you have other multipliers in affect

[andysc3]

OK, Ill do that. Also, I was looking at B4001, Injector flow rate. Since Im running a non refrenced FPR, do these tables look right?

12565

[joecar]

Non-referenced FPR: IFR table is sloped like you show in your pic.


What injectors do you have (what flowrate @ what pressure).

[andysc3]

They are the 8.1L Marine injectors. 41lbs, not sure about the pressure

[joecar]

If they are GM injectors they probably are rated at 58 psi... maybe... in which case your IFR looks correct/close.

[andysc3]

Did some logging last night, I set the tune to SD to work on the ve table. During a WOT run the commanded AFR was 12.5. I switched it back to MAF and did a WOT and the commanded AFR was 11.3. Every thing in the tunes are the same except the SD stuff.
12588 SD log
12589 MAF log
12590
12591

[superwagon]

I see in your SDAutoVE.tun that you have CAT overtemp disabled. Is your MAF log based off of the trans.tun? CAT overtemp is enabled in that one? I would be sure to set CAT overtemp to disabled and try another log based off of your MAF and see what you command then.

[andysc3]

I forgot about that. I'll change that and see what it does. Thanks

[joecar]

To fail the MAF, you have to allow a MAF DTC to trigger... in C6001 set P0103 to 1-Trip;

having this set to Not-Reported will prevent P0103 from triggering;

the PCM has to see a MAF DTC in order to failover to the VE table;

you could try setting it to Non-Emissions, if this allows the DTC to trigger then this is ok.

[joecar]

In your transmission calibration, the WOT MPH downshift speeds have to be lower than the WOT MPH upshift speeds (or it won't do the WOT upshift).

[andysc3]

Ok, I updated the tune. I havent had much of an issure on the wot upshifts.
12595

[superwagon]

In your transmission calibration, the WOT MPH downshift speeds have to be higher than the WOT MPH upshift speeds (or it won't do the WOT upshift).

Don't you have that backwards? The downshift needs to be lower than the upshift or it won't happen?

[superwagon]

Ok, I updated the tune. I havent had much of an issure on the wot upshifts.
12595

I didn't look at your latest SD tune but I thought you were having a issue with commanded fueling while calibrating your MAF?

[andysc3]

yes, it was commanding 11.3 at wot. I still had the cat protection enabled. I haven't tested it out though. I need a oil change before I do any more wot tuning.

[superwagon]

I am just asking, Do you understand VE vs MAF and closed loop vs open loop? I am not sure how much experience you have with tuning and I know it can be pretty confusing at first. Not at all asking to be a jerk or anything just want to be sure we are on the same page!

[andysc3]

I'm still learning alot. I copied most of the tutorials to a work doc so I can look over them. Any help is always appreciated.

[joecar]

Don't you have that backwards? The downshift needs to be lower than the upshift or it won't happen?Yes, you are correct (I changed my wording at the last minute and ended up messing up my post :doh: );


I corrected my post and now reads like this (this is what I originally intended):

In your transmission calibration, the WOT MPH downshift speeds have to be lower than the WOT MPH upshift speeds (or it won't do the WOT upshift).

[andysc3]

got the shift tables fixed.
when tuning for PE, do I use the autoVE map? I tried logging some WOT pulls but Im not getting any data. And when I do it will be one cell with about 10 hits.

alos, what do yall consider a large cam? I have a 227/235 .614/.624 113LSA in my 6.0L. Im considering staying SD. Would it be worth it to upgrade to a COS3 since Im planing to go boosted?

[maudyZ28]

COS 3 would probably be worth it and is much easier than i though, just follow the tutorial.

Again, following the auto VE guid you should be able to set up a map, just make sure you have the correct data selected, i,e your BEN value in your PIDs. Sorry I cant be more specific, at work atm

[joecar]

Yes, you use AutoVE during PE...

during PE, you will see the commanded fuel go rich, and the wideband should follow, the BEN shows how closely it follows.

[joecar]

If you're going boosted then you need COS3 since this has boost tables.

[maudyZ28]

andy, check also that your vehicle is conforming to your filtered parameters, ie upto temp, throttle not varying. You should see high MAP column is filled at all RPM achieved

[andysc3]

will do. Here is a snap shot of my BIN log. about a 15 min drive. Steady throttle. This is after the filters.
12607

[joecar]

Apply that, and then take another log where you go into PE (i.e. get some higher MAP and RPM cells), you may need to load the engine by applying the brakes as you accelerate (do this briefly, you don't need very much time), you can set the empty cell count low (say 5), but do filter transients.

Please do pay attention to the road (do not watch V2 or laptop), do this when there's no traffic, long freeway on-ramps may help, and please do keep safe and legal.

[andysc3]

I tried to do a short WOT run. As soon as I punched it the dash read Reduced Enging Power and I got code P1514. Here is a copy of my current tune.
12608

I adjusted C6101 20%. What else should I look at?