Shift strategy idea

[cleatus12r]

Originally Posted by 907dave

I like the idea of having predictable, consistent shifting, which recently seems to be my biggest gripe.

Buy an OBS.

[F-127]

Your stepped shift schedule seems like a good idea and I'm glad it seems to be working out for you (besides your recent leak). Goes to show that a smooth shift schedule doesn't always mean smooth/desireable shifting. I might have to try with a file and see how it goes for me as well on my next reburn.

I'm glad you liked the spreadsheet!

[GTS]

I haven't gotten in and messed with any shifting yet but I need to as my programs hold out my 1st gear a bit to long at light throttle position. When Bill was doing the tuning on my shifting the graph looked stepped just like the one you showed.

What is the measurement it's using on the bottom for throttle position? I haven't had a chance to get into a lot of the tables yet but it seems some use wird measurements.

[907DAVE]

Shifting is determined by comparing speed and throttle position. Throttle position is measured using a/d counts. Cody had a nice little layout on a/d counts vs volts, I will have to see if I can find it.

[907DAVE]

Here it is......

Just for your information:

A/D counts are a more precise way of measuring the 0-5 volt input to the PCM from the Accelerator Pedal Position (APP) sensor. There are 204 A/D counts per volt of input.

Keep in mind that the APP sensor DOES NOT put out 0 volts, nor does it go all the way to 5 volts. This means that you will never get 0 A/D counts or a full 1023 A/D counts. More like 100 to 918 A/D counts.

For those of you who have this "updated" MFD scale, you might want to take this into account on your MFD map.

[GTS]

Thanks for the info! So what are A/D counts? What does A/D stand for?

Maybe this is a question for a different thread being it's a little off topic but at what point of APP does 100% mass fuel desired come in at? And is there a reason other than the throttle pedal won't push the sensor far enough that it won't hit a full 5v?

The reason I ask is because I trimmed the stop down a bit awhile back to get the voltage close to 5V. The problem that I ran into was that if I pushed real hard it would shut the engine down so I assume once it hit that full 5V it was to much and the PCM cut fuel. I thought about just putting a 5V regulator on it so that it would come up to 5V and not go over. This way I could get full load fuel and not have to worry about it shutting down. Is my thought process on this off?

[907DAVE]

Originally Posted by GTS

Thanks for the info! So what are A/D counts? What does A/D stand for?

Maybe this is a question for a different thread being it's a little off topic but at what point of APP does 100% mass fuel desired come in at? And is there a reason other than the throttle pedal won't push the sensor far enough that it won't hit a full 5v?

The reason I ask is because I trimmed the stop down a bit awhile back to get the voltage close to 5V. The problem that I ran into was that if I pushed real hard it would shut the engine down so I assume once it hit that full 5V it was to much and the PCM cut fuel. I thought about just putting a 5V regulator on it so that it would come up to 5V and not go over. This way I could get full load fuel and not have to worry about it shutting down. Is my thought process on this off?

A/D counts is basically a signal that has been converted from 0-5 volts to a digital signal 0-1024 A/D.

Here is some good reading on the subject.....

http://forum.gopowerhungry.com/minot...0-scaling.html

http://forum.gopowerhungry.com/minot...-question.html