Highway mode question

[srgould41]

7747 $42 ECU

I enabled Highway mode and could see in the data log where the engine went open loop. I have read this shows the engine is in highway mode. The first run shows sporadic highway mode. Looking at the scalars there is one named "HiWay Max MAP". The value is 74.92 kPa. I am seeing about 77 to 85 kPa at 55 to 60 MPH. I believe that means the engine drops out of highway mode when the MAP is above 74.92 kPa. Since I am quite often above that value I decided to raise it to 90.05.

I also changed the "HiWay - MPH Enable" from 55 to 50.

I ran a test today and the log shows the engine never went into highway mode. What am I missing? The above values should allow longer stints in lean cruise, shouldn't it?

Steve

[steveo]

mm unless you have a gigantic cam or incredibly heavy vehicle, MAP that high means you are NOT cruising, you're hauling load. am i wrong?

[srgould41]

5k lbs FJ40 with the aerodynamics of a barn door.

[steveo]

i wouldn't 'highway mode' with that much load on an engine, it's asking for trouble. hell i wouldn't operate an engine continuously with that much load period, i'd gear down.

[EagleMark]

Post a data log. That 74.92 is where I kick out of HLC, anything more is just to much of a load! If you are pulling that much kpa then HLC won't help...

[srgould41]

Here are my last 2 logs. 020-7-19-14.xdl shows the Hiway Mode coming on and off. 023-7-27-14.xdl is after making the following changes and no more Hiway Mode:

HiWay- MPH Enable - from 55 to 50
HiWay - Max MAP - from 74.92 to 90

Post a data log. That 74.92 is where I kick out of HLC, anything more is just to much of a load! If you are pulling that much kpa then HLC won't help...

[srgould41]

I looked at my last bin and the hiway patch showed an indeterminate status. I figured something corrupted. I started over and it is working again.