Printable View
Anybody with a LS2 GTO that has converted to flex fuel have a copy of your Flex spark adder table you could send me?
Wanting to get a decent baseline if there is anything that should change from the stock zero'd out table.
I have heard some people say add a flad 2 degrees across the board, some say lower RPM should remove some spark, so wanted to see an actual working tune and not hearsay.
Thanks
Here is mine. I have included the hi octane table also so the flex table makes more sense. I use the alcohol correction spark table to add half the spark to the flex table in case the sensor malfunctions at wot. It will pull 3 degrees if that happens. This is a PD blower car. The E40 flex spark table will not allow -numbers so that's why all the zeroes instead of -1, -2 and so on. Hope this helps. It is probably not correct for your setup, whatever that is. You will find that you need to play around with the startup spark and startup fuel charts also once you get the 85 flowing.
Here is mine. I have included the hi octane table also so the flex table makes more sense. I use the alcohol correction spark table to add half the spark to the flex table in case the sensor malfunctions at wot. It will pull 3 degrees if that happens. This is a PD blower car. The E40 flex spark table will not allow -numbers so that's why all the zeroes instead of -1, -2 and so on. Hope this helps. It is probably not correct for your setup, whatever that is.
Mine is NA, and right now, other than 3" cat back, Flex fuel enabled, and a Duspeed OTR CAI, there aren't any other Mods. It's an M6.
Hmmm--You can probably add the flex spark down low, but at wot, you should limit yours to about 2 degrees total so as not to break any pistons. And that's if you are on the stock spark table. Make sure you have a wideband. Do you have the GM flex sensor wired in?
Still on the stock table, using the GM sensor. Putting my WB in Friday. Commanded A/F follows fuel content pretty well, Dave Steck had me send him my stock file so he could enable the flex in it. Fuel trims all look good as well.
Those of you that are wanting to still have negative numbers for flex part throttle on the E40 can get around it this way.
Use the 12635 Alcohol PE/COT to add a negative number. I usually use a number like -10 in the entire table.
Now you will want to counteract that by putting a +10 in the 12678 Flex Adder table. Now you are back to zero but it physically shows +10 in the table so anything below 10 is a negative value.
At this point now you can populate flex tables like you would on any other platform, just realize the values will "appear" to have 10deg more timing in them than is actually there.
Thanks!!! That is really good to know. When I run E85, it is at the track, so idle or wot. It would be nice to have the spark table correct in case I street drive it with flex. I am guessing that you cannot do that with a remote tune? Long drive from FL to KY.
Smart. Thanks!Quote:
Originally Posted by LSxpwrdZ
Wanted to update this thread, E40 logic strikes again, don't try to do the +10/-10 method above. Had a 2005 GTO that this method didn't behave correctly. The 12635 table wasn't active all the time so it never pulled the 10deg back out putting the global timing over advanced 10deg. As soon as PE kicked in however the table activated working as it should. There is another enabler/multipler table for the PE/CAT tables that must be not accessible currently preventing this table from being active all the time like older Gen3 PCM's.
Thanks!!
Car is finally finished!
LSA blower at 10 PSI, BTR stage 3 torque PDS cam, kooks longtubes and ID1050X injectors...
Makes 610 to the tires on E85, 590 on 92 octane.
Was there a fee to enable the Flex fuel?
NO fee. It is just a tab--Enable/Disable