E38 2bar SD upgrade issues

[silverbullet08]

Im having a wierd issue on this car with the 2bar SD OS upgrade.

The car is a 2008 corvette A6 E38 T46. I just finished building the twin rear mount setup and have been running it on straight MAF. Ive had no issues with this other than the occasional random flash that does not allow the car to shift out of 2nd gear. Must be a bug somewhere still. "goes away after a reflash

Anyways, the car runs awsome and tuning is straight forward when using the stock OS in MAF only. I can put the car into SDCL mode on the factory OS as well and it runs fine just a tad on the rich side. I messed with the Virtual VE software for a bit but it seems to just be a patch to me for dialing in certain areas so I upgraded to the 2bar SD OS for the dual PE tables and tps multiplier.

I used the VE table I generated off the factory OS to fill the three new VE tables and checked that the MAF Hz were still scaled the same. Everything looked good so I applied the new OS with Write Entire. I then disabled MAF mode with the Rpm boundaries and the Hz table. Did a flash cal and tried to crank it. It starts for 2 secs and dies... Wide band read 12.8 initially under cranking and made its way up to 14 right when it dies. So I went back and put it into MAF only mode still on the 2bar SD OS to see if the VE table just needed some work. The car starts and idles, but at 1800 rpms it cuts fuel, goes into limp mode, and dies, also my fuel trims are out of wack again. I looked at this very close and it doesnt follow any of the rpm or map boundaries for dynamic airflow. Then looking closer I saw it would fail the maf at that RPM every time for a split second then show -4- in MAF sensor state on the table display for a few seconds then revert back to "no fail" MAF mode after the car was dead. I thought it had to be a VE table issue at this point since the car would die as soon a it hit SD mode every time.

Sooooo I spent the next 3 hours adding and subtracting up to 50% fuel from the VE tables in 10% increments but had no luck. So I went back with factory VE tables and did the same procedure to the TPS mult table... still dies every time the maf fails. For grins I set it up for MAF only on the SD OS and started it again. This time while it was idling I used the scanner to turn force openloop. The car didnt die, but due to a couple multiplier tables I looked past it was commanding a 12.82 afr and it ran fine at 12.82 afr all the way back. I pulled the log up and the wideband showed a lean condition in lower map and rpm areas but by less than 20% and only around idle or off throttle rolling "lean meaning leaner than commanded". Everywhere else there was 7% error or less. So just to test theory I pasted this information into the VE table, forced SD, and it made no difference. Tried the TPS table, still nothing...... WHAT IS UP????? am I a complete moron or just missing something simple here?

Edit: I adjusted the OL mult tables and forced OLSD in the tune it will commanded 14.78 in OL but will not run for more than 5 seconds. Only drivable if you command OLMAF...?

[Chris@HPTuners]

make sure you have the P0101/2/3 set to 2- No MIL. If they are set to MIL on 2nd weird things will happen.

[DSteck]

Don't post a file or anything.

[silverbullet08]

make sure you have the P0101/2/3 set to 2- No MIL. If they are set to MIL on 2nd weird things will happen.

Will try that. I believe thats the way I had it originally but ive tried so many different things and made so many changes I cant remember. Does this apply to the diagnostic test for p0101, p0106, and p0121 under general/diagnostics? As in the ECT should allow it? I had it enabled for a bit but have it disabled currently. Il post up the file in a minute.

[silverbullet08]

Here is the file im working with.

[kangsta]

post a log. do you have a 2 bar sensor?

[kangsta]

also, VE table is in GMVE not %. Set the cal for the right map sensor and redo the VE table

[silverbullet08]

Yes there is a 2 bar map on the car. Now the VE not being in the correct format would make sense! I knew it was going to be something stupid. Thank you.

[MStefak]

The the linear value and offset correct for the map your using ?

[silverbullet08]

The the linear value and offset correct for the map your using ?

Seems to be almost spot on. Key on not running reads 101-102kpa in the scanner.

[silverbullet08]

Well I changed the VE to % and set all the DTCs back to how Chris specified but its still not right. I flashed it with a write cal only and it did claim maf failed in the table display but not in the status bit. The dash read check electrical system and idles a 10.8 which if it is actually going into SD mode could be correct since I used the factory tune to redo the VE with. I went for a test drive and after 4 flashes to the VE table and the TPS table in 20% increments I get no response and it still runs rich. I tried a Write entire back to stock then a write entire of the SD OS again but it gives the same issue. I flashed the maf based file on the factory OS back in and the car runs perfect with nothing on the display... Is anyone actually running the 2bar OS? Is this normal for you to have to clear the display everytime you crank the car with the 2bar OS?

[SAM_69]

Zeroing the maf cal tab. might be effective also under Dynamic Airflow in high RPM disable add 8192 and high RPM re-enable 8100

Try to post a log file too
good luck

[SAM_69]

Also your Offset vs. Press tab. kinda high in the low KPA's stick with the stock one for now

[Bill@HPTuners]

Well I changed the VE to % and set all the DTCs back to how Chris specified but its still not right. I flashed it with a write cal only and it did claim maf failed in the table display but not in the status bit. The dash read check electrical system and idles a 10.8 which if it is actually going into SD mode could be correct since I used the factory tune to redo the VE with. I went for a test drive and after 4 flashes to the VE table and the TPS table in 20% increments I get no response and it still runs rich. I tried a Write entire back to stock then a write entire of the SD OS again but it gives the same issue. I flashed the maf based file on the factory OS back in and the car runs perfect with nothing on the display... Is anyone actually running the 2bar OS? Is this normal for you to have to clear the display everytime you crank the car with the 2bar OS?

Post the file if you'd like help.

[silverbullet08]

Post the file if you'd like help.

I posted it earlier. Here it is again with the changes suggested. I will post a log up of it in a bit.

[Bill@HPTuners]

Tune looks better, still a few little things ie ve table map axis needs to be adjusted, probably others. Nothing stands out as being a huge issue though. How far off is your afr error now?

[silverbullet08]

Tune looks better, still a few little things ie ve table map axis needs to be adjusted, probably others. Nothing stands out as being a huge issue though. How far off is your afr error now?

I made another 4 solid datalogs and flashes a little bit ago. It seems to be bearly moving in the right direction. Cruising averages a 11.8-12 and decel comes up to stoich but the guage cluster wants to read check voltage system when on the SD OS still... I thought I saved a datalog to post up but I cant pullit back up. Il try getting a log in a bit to post. Voltage stays at 14-14.1 cruising on SD OS and 13.8-13.9 on decel... quite a bit higher. Im going to double check a few things but it seems to only do it when on the SD OS.

Are you talking about the zone boundaries or the actual map axis of the VE tables?

[SultanHassanMasTuning]

best of luck and let us know how it goes

[DSteck]

What MAP sensor are you using?

I don't know how you really expect help when there's no log.



I can tell right now though, here's the start of your problem:

[silverbullet08]

Ok I took yalls info in and reshaped the VE by hand and got it into normal shape, Idk why it as shaped that way from the VE editor. That alone didnt do much as far as improve fueling but on the next flash I made another major change by pulling 20% across the board...FINALLYYYY!!! It actually changed fueling!! lol Heres a datalog of it on the last flash I got today. It still wants to show check voltage on the display on this OS. Car was running a bit lean on this but it was awsome to see it was actually making a change for once!