MSefi.com read only forum (Jan.15,2018)

Ok I think I missed something somewhere. I filled out the alpha-n table and turned it on. But when I started the car it appeared to track like it was still using the MAP sensor.

So if I program the 0% TPS/1000 rpm cell for 30 kPa...I would expect the car when ideling at 1000 rpm and the tps at 0% to be pulling from the 30kpa/1000 rpm cell on the VE table. But it wasn't it...somehow it was pulling from the 85~90 kPa cell like it did when I was using Speed Density.

Is there something I need to switch other than the settings in the software? Oh I was using Tuner Studio to adjust my settings. I have a MSII with 2.3 code loaded. I know I'm working in the past I just havne't felt like getting up under the dash to load the latest software.

As for why I'm switching to alpha-n. I did some reading/searching and there was a thread about lumpy cams and how speed density may not deliver the best solution. Since I was having issues getting certian areas to be consistant in 2nd and 3rd I thought i'd give it a try.

In addition to filling out the table you have to choose the alphaN option (blend map and tps) and select the Rpm region in which you want to use alphaN and where you want to use SD. Basically there are 3 options:
No alphaN

alphaN below Rpm1, a tps/map blend between Rpm1 and Rpm2, and map above Rpm2

The reverse of the previous, that is map below Rpm1.

Obviously by selecting very high or very low Rpm1,2 you can get pure alphaN or pure SD.

Ok, so let me make sure I understand.

If I set RPM 1 (labled as Pure Alpha-n to blend...) to say 6000 rpm, and I set RPM 2 (Blend to SD Threshold) to say 7000

The alpha-n area is 0-6000, the blend area is 6000-7000, and the SD area is above 7000 rpm.

And if I never want to see any SD I would set Rpm 1 to say 8000 rpm (redline of motor is 6500) and rpm 2 to say 10,000 rpm, that will give me pure alpha-n all the time right?

I think I cleared up the question above this post but I have come up with a new one...

When viewing the Data Logs in relation to the MAP readings that show up...are those the calculated MAP readings from the Alpha-n table or are they the true MAP readings from the MAP sensor?

The Map column in the datalog is the sensor reading, but there is a variable called calcMap that can be logged or displayed in a gauge. That is the equivalent MAp calculated from the specified blend of map/ tps in alphaN mode. (of course it is pure map or pure tps in those rpm regions where it is supposed to be pure SD and pure alphaN.