2013 GMC Sierra E85 Initial Log

[capt_zman]

First of all, thank you to all the posters/contributors on here as the information is absolutely invaluable. Anyways, I've been tweaking my initial e85 tune today. It's not much more than the stock tune plus a couple of minor adjustments. Any comments on the spark? Also, it's a 4.8L (soon to be 6.2L).

Thanks.

[GHuggins]

Hard to tell without a tune... Spark might be a touch low from the log - hard to tell? Is this a SD tune - if not add maf hz to the channels... If it is the higher rpms needs more fuel... All I can really say by the log right now...

[capt_zman]

Did a few more modifications to the tune and got a good pull in on a nice flat road this am. Overall, even though its a work in progress, it drives well and pulls well for a 4.8.

[5FDP]

You'd benefit from installing a real flex fuel sensor too, currently the virtual sensor only says you are running 55% ethanol content and they are very inaccurate.

Adding injector pulse width and knock retard to your channels list will be helpful too, those kind of things are stuff you want to know.

[capt_zman]

You'd benefit from installing a real flex fuel sensor too, currently the virtual sensor only says you are running 55% ethanol content and they are very inaccurate.

Adding injector pulse width and knock retard to your channels list will be helpful too, those kind of things are stuff you want to know.

Great information thank you. Attached are 2 more logs with the channels cleaned up and everything functioning.

[GHuggins]

To make things easier - you would be better off to 0 out your gas PE/COT spark table and just worry about the alcohol tables and normal spark tables... You can also more than likely add more timing in the 4000 to 6000 rpm area - there's a gigantic dip in the timing table there with the alcohol even with the PE/COT table's addition... Do a copy / paste special half to your MAF table - should clean it up with one correction - it's not bad off...