U7147 shift firmness

[Ryder276]

Without having to buy a third party tune, can you guys soften up the harsh shifts a little?
It chirps the tires on the first to second shift under heavy throttle (unmodified 91 octane tune), i have had this tuner for awhile-just concerned about the drive train.

Thanks.

2005 Crown Victoria P71
9r04 tune

[mikel]

export a copy of the last tune written and post it here please

[Ryder276]

ok here you go.

[Ryder276]

Did you guys come up with anything?

[bigkeeko]

just concerned about the drive train.

When modifying settings to improve the firmness and holding power of the transmission, we sort of have to undo what the manufacturers do as they`re under the misguided concept that stock settings mean cars should shift as smooth as silk. If they didnt they`d get slaughtered by the automotive media.

The first thing (for a performance program to do) is reduce the torque reduction. This gets rid of the "dive" that occurs between each shift. Now if we eliminate torque reduction with no other considerations, you are going to end up with worn out clutches. This brings us to step 2...

Next we reduce the amount of slip time in between each shift. This reduces the amount of wear on the clutch plates by reducing the time it takes for a shift to complete.

Finally, there are two ways to modify line pressure: Line pressure modification during shift (for each gear), and overall line pressure modification (also for each gear).

For most performance situations, increasing pressure on each shift improves the shifts by causing a quicker, more positive lock of the clutches. This reduces wear. Once the clutches are locked or engaged, the additional pressure backs off and you run the desired main pressure. There usually isn't much need for increasing the overall pressure in these situations as the clutches don't have any problem holding the moderate power gains you'll normally see with a programmer. Of course if you significantly change power output with a supercharger, turbo, nitrous, etc. then you may run into an issue and those needs are addressed in a different fashion.

For towing, not only do you want improved shift pressures, but you'll usually want a slight increase in overall pressure to ensure the clutches don't slip with heavier loads. Since we design towing programs with much of the torque reduction still in place, we don't need to get too aggressive on shift pressures. This helps prevents stressing the overall drivetrain, including the transmission.

It's quite true that increasing transmission pressures can cause problems with the transmission, including excessive tranny temps so I can half understand your concern, However, most of the files that cause this damage are often running anywhere from 25 to 50 PSI higher than stock on both shift and main pressure. Most tuning with these tuners is much more conservative, and usually up to about a 10 or 20 PSI increase will do the job nicely.

What I`m saying is, your box will be fine.

[Ryder276]

10-4 on all that.
Thank You.

[TKB]

This should help

[Ryder276]

I will load it up, Thanks!!

[Ryder276]

i get a error message "cannot load tune, vin mismatch" on the custom tune.

[mikel]

can you please post your backup file?

[Ryder276]

Here you go.

[Ryder276]

bump

[Ryder276]

Any update on the fixed tune??

[Ryder276]

bump

[mikel]

try this