40 Degrees max timming, i want more

[fezz57]

guys, playing around with my car (OS 12225074) and seem to find that when i log the timming values the max timming is 40 degrees. even if i have say 44 deg in both my high and low oct table

cant seem to find a way to increase this.

does the factory limit this to 40 deg

anyone found a way to overcome this?

[WeathermanShawn]

Make sure on your scan tool that your max value is above 40 degrees.

I had a similar problem. I just changed the Scan Max Value to 45.

[fezz57]

tried that,
set the max value to 50, and set the gauge to 50 but still only goes to 40 degrees.

any other suggestions

[mr.prick]

I noticed that my spark advance gauge would only hit 40* and flash red today.
Check the alarms tab in the gauge properties for min/max settings.
Is your log showing SA values higher than 40* or is it limited to 40* too?

[fezz57]

the alarm is set to 50 aswell

sorry whats SA values??

[rally1]

I have tried getting over 40 before while playing around with lean cruise and had no luck, it seams there’s a max timing value hidden somewhere.

[mr.prick]

the alarm is set to 50 aswell

sorry whats SA values??

Spark Advance.

[SSpdDmon]

Post tune pls.

[fezz57]

here, (hope i posted it right)
cheers

[rally1]

When I was trying to get over 40deg I had been tuning the spark table with bi directional controls, my log was showing that I could go over 40 with bi directional but it would max out at 40 if I tried to run it above that from the tune file, so there must be a limiting factor in the PCM somewhere, unless you try and talk nicely to Paul 40deg is going to be your limit.

[GMPX]

I have a feeling that there is a single max timing figure hardcoded in the PCM, I do remember something like that.....40 degrees is awfully high.

[joecar]

Post some log files.

[fezz57]

thats probably the case, the car seems to love heaps of timing at light throttle.

i see the e38 cars have much more than 40 deg timing

[SweetS10V8]

Whats telling you it loves the 40 degrees of timing?? Do you have a chassis dyno and watching the torque under light load or something?

[joecar]

When do you need 40*...?

[joecar]

Post log files.

[fezz57]

the fuel economy has improved, the more timing the better i find.

[joecar]

Oh, so you mean at cruise and low load. Post some log files.

[fezz57]

here's a log

[fezz57]

anyone?? suggestions?

[The Alchemist]

old post but I've just found this with a cammed GTS I'm tuning...I have been doing light load tuning with the MAP zoomed in to watch for changes in vacuum as you change the timing. You can indeed command and get more than 40deg using BIDI controls BUT when you enter say "45" in the spark map, reflash and observe again you only ever get a max of 40.
At light load , IE free rolling on the dyno , the MAP is your main indicator on engine efficiency. This car clearly loves 45+deg free rolling at 1800rpm and over and runs smooth with NO surging. Change to under 40deg and its a dog. Will post LOG file to demonstrat later today. All very interesting stuff its just a pity you can't achieve this unless in BIDI mode :(

[The Alchemist]

mmm having done up to 2400rpm at light load and knowing I could make this car so much better at light load this is now really frustrating !!! :shock:
WRT to "MAP" tuning at light load, the moment you go past free rolling on the dyno manifold vacuum as an indicator goes out the window and tractive effort becomes the main stay for setting spark timing.....
In the attached jpg you can clearly see the vacuum increase with each timing change of 2 degs and then back again. Worked a treat but only in BIDI can you go above 40....
Can this be looked into by EFILIVE admin/programmers...?

[The Alchemist]

added screen shot of MAP sensor during light load tuning

[The Alchemist]

Hey,
can this be looked at by the EFILIVE crew to give me a final " no its 40deg and thats it > stop asking" or " yeah sure we'll have a look at it and stick it the next update"
Makes a huge difference in a cammed engine especially at lower cruise revs.
Thanks > Mike

[joecar]

Hey Mike, I pm'd Paul.

[GMPX]

Mike, I don't recall on the LS1 PCM if there was a hard coded OS limiter for spark or a tunable parameter.
If you can Email support your .tun file, I'll have a look and if I find something I'll just change it in hex, it would be too much work to add an OS patch (if that is what it needs) and regenerate the LS1 .calz files for this request.

[The Alchemist]

copy that :)

[Naf]

I have a simiar issue, but i max out at 46 degrees...I have tried everything but i cannot get my timin any higher than 46 degrees.

Please help