Early 99 tunes????

[freeride707]

ok. thats what i thought but with your tuning the factory benefits of having pmt1 dont matter?

and what exactly is done to make the truck quiet on whisper mode? is it drivable in this mode? say to leave the neighborhood early in the morning etc

[907DAVE]

The Wisper mode is done by retarding injector timing. Yes, it can be drove in this setting but probably not the best thing for extended periods. I am not sure about how this program works on a cold engine, but I can imagine the smoke (white) would be considerably thicker until things warm up a bit.

Now ...........if you were using a synthetic oil the negative effect would be substantially decreased because of the oils ability to "flow" at colder temps.




These are all just my assumptions and the PHP crew would be better suited to answer this question.

[cleatus12r]

Originally Posted by freeride707

ok. thats what i thought but with your tuning the factory benefits of having pmt1 dont matter?

and what exactly is done to make the truck quiet on whisper mode? is it drivable in this mode? say to leave the neighborhood early in the morning etc

The shifting with the XLE4 program we would use on your truck would be much better than stock but the deficiencies that the E99 trucks have is not fixed in the tuning.

Yes, the truck is driveable in Whisper Mode as Dave pointed out. It's not going to hurt anything but you will get a lot of white smoke with a cold engine.

Thanks Dave!

[freeride707]

ok thanks for clearing that up. i plan on running synth, next oil change. i would mostly use the whisper mode for coming home late, not leaving early. now just to save up for a chip.
i plan on getting stock, 65tow, 80daily, 140race, whisper, and either smoke or high idle