Scaling?

[907DAVE]

Thanks Thomas.

OK now to my next question.

Why in the ICP map on few of my programs the MFD only goes to around 44, when others go to 70?

[cleatus12r]

That is what your last tuner did. Why? I couldn't tell you for sure. What you could do is rescale those to stock with the normalizer FN013 and try it........

I don't see the reason for doing what they did.

[907DAVE]

That too care of that.

How did changing that back affect the map as a whole?

[cleatus12r]

I'm looking at them right now....

[cleatus12r]

Ok Dave,

Here's what I am going to guess.
Your tuner decided that for some reason, any ICP commanded after 44 MFD was to continue to use the highest values....essentially causing the PCM to run the same ICP at 100 MFD as it does at 44 based on any RPM.

I could see scaling the MFD axis on the ICP map to something higher (like 80 or 100 MFD instead of the stock 70) for better resolution and control, but not lower. Bill has no idea why it was set up that way either.

Bill is actually looking at yours as I type this.

[907DAVE]

Ok... so after 44 MFD the ICP will not raise anymore but instead stay the same all the way to 100?

Is this the same thing that happens with stock scaling(70mfd)?

[cleatus12r]

Yes. But on a stock truck (or near-stock truck) it doesn't matter since the boost related fueling will only allow 70 MFD anyway.

[F-127]

Originally Posted by cleatus12r

Your tuner decided that for some reason, any ICP commanded after 44 MFD was to continue to use the highest values....essentially causing the PCM to run the same ICP at 100 MFD as it does at 44 based on any RPM.

Not to steal Dave's thread, I had a been meaning to ask a question about that. Make sure to answer his questions first.
So anything "off the charts" is referenced the exact same as the edge of the map/graph? Is my interpretation right?

How about when you get a situation like this?

[cleatus12r]

Dave,

Bill was just as confused as I was about why they'd want to do that. But then again, he brought up the graph of a few of the ICP maps and kind of made a funny face about them, too.

Thomas,

I have often wondered that myself with the stock MFD map as most of the maps are that way. I have always just rescaled the A/D counts so that 100 MFD occurs at 1023 (or 1000 in your case). I'll ask Bill tomorrow (since I hate bringing up work-related stuff after or before work hours) what he thinks about it.