Why are my shifts so hard while in Speed Density?

[Bill@HPTuners]

Many earlier Gen 3 calibrations commanded max line pressure when the maf fails...probably GM's way of telling you to bring your vehicle in to be fixed

You can disable this function by going into the editor & under Trans Diagnostics change the MAF Max line pressure drop downs to disabled.

I've attached a picture of the 3 drop downs I speak of.

[Dirty Howie]

I wonder how mine is set as I didn't notice hard shifts in Open Loop.

......you don't mean that little kick in the pants in the 1-2 shift ??


DH

[Russ K]

The 2001 & up vehicles don't have the Maf DTC shift pressure table enabled.

Russ Kemp

[xonelith]

Is this the same thing for us V6's (otherwise known as 'safe mode')? I know if the MAF or the MAP are disconnected, the transmission kinda does the bucking bronco when putting it in D, and shifts really frickin hard.

If so, I see a request going in to HPT for new parameters

[rs2112]

Many earlier Gen 3 calibrations commanded max line pressure when the maf fails...probably GM's way of telling you to bring your vehicle in to be fixed

You can disable this function by going into the editor & under Trans Diagnostics change the MAF Max line pressure drop downs to disabled.

I've attached a picture of the 3 drop downs I speak of.

This has been a problem I could not figure out thanks this helps.

[MikeGyver]

The 2001 & up vehicles don't have the Maf DTC shift pressure table enabled.

Russ Kemp

I just happened across this thread this morning. My 2002 OS truck had the MAF DTC max shift pressure enabled. It seems like it's been 10 years shifting this way. I haven't been looking for a cure, I just assumed that for some reason the trans shifts like this because of the blower. I figured that I would dig into it some day. I drove out of my way today enjoying how stock-like my trans is now. Maybe it would have caught my eye earlier if in the READ ME section the title was changed from "Max line pressure in speed density" to "Max shift pressure in speed density".

[lanebaumann]

My 2003 truck does not have the MAF DTC max shift pressure enabled. Is there any other way to disable the max pressure shifts?

[Meangreen]

The 2001 & up vehicles don't have the Maf DTC shift pressure table enabled.

Russ Kemp

is there a way to get this enabled? lots of people could use it.

[blindsquirrel]

is there a way to get this enabled? lots of people could use it.

You're quoting a post from 14 years ago. Lots of stuff has changed, lots of tables have been added over the years. And you are asking a specific question about a specific item in your specific tune file from your specific vehicle, and did not post said file for anyone else to look at to see if they can find something that you overlooked or misunderstood.

[Dan_McD]

Goto trans diagnotics and disable max line pressure when maf failed