Driving in Whisper Mode
 

So it looks like the Wife just drove my truck 120 miles with the chip set in whisper mode. Any harm in this. She said it drove fine.
Thanks
Matt
Early 1999 F250 Crew Cab 4X4 7.3 liter

Nope, no harm. The fueling and timing maps as well as all transmission functions are normal at all RPMs above an idle...or 1000 RPM at most.

The biggest thing you'll notice is probably some slight loss of performance and fuel economy. Whisper mode does pull a bit of timing out, but doubt it would really hurt anything at all.

Does your Whisper Mode affect more than just idle, Bill?

If so, to the original poster, go by what Bill just said.

Yes, timing is reduced 6-8 degrees, depending on the vehicle. Not exactly the best word in performance but otherwise not generally harmful.

It looks like I lost a couple of miles per gallon or so on that tank but other than that everything else seems fine. I guess I was alittle worried that the engine would somehow get loaded up with the reduced timing. Oh well towing the TT next weekend so that should clean it out:cheesy smile:.

I still can't believe how much better this truck tows with one of Bills chips.

Thanks
Matt

I remembered seeing this post so I tried it. Mine spit and sputtered and poured white smoke like no tomorrow when I drove in whisper mode.