How Bout' a "Snow and Ice" tune

[907DAVE]

Maybe make the idle when extremely cold (about -20 to -40)not sound so freakin loud. Kinda scary sounding.

Also I think all the shifts should be really smooth and early, lock the TC sooner than normal to keep RPM's low(below 1800).

This is one of the main reasons I want the Minotaur Software.

[cleatus12r]

Originally Posted by 907dave

Maybe make the idle when extremely cold (about -20 to -40)not sound so freakin loud. Kinda scary sounding.

Also I think all the shifts should be really smooth and early, lock the TC sooner than normal to keep RPM's low(below 1800).

This is one of the main reasons I want the Minotaur Software.

Been there, done that.

I use 5/40 in the winter and have written programs to address this concern relating to SOI vs. EOT and SOI delay when the engine is really cold.

I agree with the smooth shifts....always have agreed no matter if it's for icy roads or driving on pavement in the summer.

The problem with applying the torque converter clutch earlier is that even though there is less torque available in sub-1800 RPM ranges, the drive wheels get a direct power input from the engine. Conversely, when the TCC is not applied, the slippage in the fluid coupling greatly softens the "impact" of torque application to the rear wheels.

[907DAVE]

Maybe change the PWM of the TCC to soften its application, and have it unlock immediatly when you let off the pedal, for me any way to keep the R's down would be nice.

[cleatus12r]

Originally Posted by 907dave

Maybe change the PWM of the TCC to soften its application, and have it unlock immediatly when you let off the pedal, for me any way to keep the R's down would be nice.

Piece of cake. The TCC apply rate can be changed to apply the clutch softly. BUT "burn time" is not good and the longer the apply takes to reach 60+% duty cycle the more friction material damage due to heat. I use the value of 60% because it is usually enough to create a lock and hold condition depending on EPC or "line pressure".

Unlocking the TCC on deceleration is also possible. Heck, lots of PCM strategies out there do that anyway. It's possible to change a few parameters and get even a PMT1 to do it.

[907DAVE]

Originally Posted by cleatus12r

Been there, done that.

I use 5/40 in the winter and have written programs to address this concern relating to SOI vs. EOT and SOI delay when the engine is really cold.

I

Is there any harm by doing this? Shouldn't the engine noise level be similar on a cold engine as a warm one? Or are there other things influencing this? I realize that it wont be as quiet but damn this thing can get really loud. As a tuner how would you know when you have gone too far?

[cleatus12r]

Originally Posted by 907dave

Is there any harm by doing this? Shouldn't the engine noise level be similar on a cold engine as a warm one? Or are there other things influencing this? I realize that it wont be as quiet but damn this thing can get really loud. As a tuner how would you know when you have gone too far?

There isn't any real mechanical harm in "retarding" the start of injection when the engine's cold. As far as retarding the SOI goes, it's not really "retarding" since it's more accurate to say that it's just less advanced. A lot of folks sell quiet tunes....even PHP has a Whisper Mode. Incorporating less advance in both the Start Of Injection for RPM vs. EOT and the Start Of Injection Delay for EOT vs. ICP maps allows the PCM to delay the commanded injection event slightly for the thinner oil when cold since the whole reason that map is there is because of the oil viscosity along with slower combustion rates and longer ignition time. Using 5W/40 oil when cold results in a "faster" injector than one utilizing 15W/40 at the same temperature therefore less advancing of the timing is necessary.

The noise level will always be slightly higher with a colder engine because it is working harder just to stay running. The drawbacks to not enough injector "lead time" when cold could be harder starting, white/bluish smoke, and sluggish performance. It takes quite a bit of "less SOI advance" to get these drawbacks so once you get to the hard starting or smoking, you've gone too far with that particular truck. Too much SOI advance is definitely audible and it's something that should be avoided for fear of a junk engine.

If you've ever heard of people recommending being easy on the engine while it's cold, it's because of these EOT related maps. There is A LOT of "advancing" going on there. Add into that the increased SOI of aftermarket tuning (RPM vs. Mass Fuel Desired) and you get some pretty awesome timing.

[John Anderson]

Why not just soften the throttle table a little. You would have to basically push much harder to the same amount of power. Everything above half throttle could be the same, but below kill it by about 10-15 percent.

[cleatus12r]

From post number 2:
.........for the most part the only thing you can do to keep from spinning is using a stock program or less than stock power levels.

Exactly my thinking, John!

[88Racing]

Just get yourself some of these:www.mattracks.com
Then you will be able to go anywhere!
J/K!!!!!
LOL's
Lars

[907DAVE]

Originally Posted by cleatus12r

There isn't any real mechanical harm in "retarding" the start of injection when the engine's cold. As far as retarding the SOI goes, it's not really "retarding" since it's more accurate to say that it's just less advanced. A lot of folks sell quiet tunes....even PHP has a Whisper Mode. Incorporating less advance in both the Start Of Injection for RPM vs. EOT and the Start Of Injection Delay for EOT vs. ICP maps allows the PCM to delay the commanded injection event slightly for the thinner oil when cold since the whole reason that map is there is because of the oil viscosity along with slower combustion rates and longer ignition time. Using 5W/40 oil when cold results in a "faster" injector than one utilizing 15W/40 at the same temperature therefore less advancing of the timing is necessary.

The noise level will always be slightly higher with a colder engine because it is working harder just to stay running. The drawbacks to not enough injector "lead time" when cold could be harder starting, white/bluish smoke, and sluggish performance. It takes quite a bit of "less SOI advance" to get these drawbacks so once you get to the hard starting or smoking, you've gone too far with that particular truck. Too much SOI advance is definitely audible and it's something that should be avoided for fear of a junk engine.

If you've ever heard of people recommending being easy on the engine while it's cold, it's because of these EOT related maps. There is A LOT of "advancing" going on there. Add into that the increased SOI of aftermarket tuning (RPM vs. Mass Fuel Desired) and you get some pretty awesome timing.

For me the truck gets extremely loud during cold startup and easy driving even after extended idle time. I realize that the EOT is not up to temp yet which is why it is like this, but it really does not sound healthy at all. It has really concerned me. Keep in mind that I am running Hybrid injectors and know that it will never be as quiet as it was with the split's in there. So if I understand correctly if the truck is properly tuned when cold the idle and cruising noise levels should be similar to when the truck is warmed up? And its possible that I can be doing more harm to the engine with this (advanced SOI) than I could be with it less advanced? The white/blue smoke does not bother me much as I no longer have the intake air heater, fuel heater, or EBPV anymore and those all aid in reducing that. EPA probably wont like me much but I dont mind.

Ok, so how about doing the same thing (lessening SOI) on a warm engine to reduce engine noise. What adverse effects would that have. I would assume higher EGT's and poor economy, anything else? Would be nice to have a tune for city driving where economy and EGT's are nut much of a concern anyways.

Sorry, I am green at this and trying to get a handle on things.