Hi All,
I've been driving with the 93DMS tune from ZFG. It's been pretty much smooth sailing with performance and customer service response.
As some of you know, the DMS tune allows you to put a different driving profile in any driving mode.
All of my modes are programmed with stock profiles with the exception of the normal mode which has the "Performance Plus" profile and the sport mode which
has the "Racing Profile".
The Performance Plus offered an extra 25WHP while the Racing can boost up to 100 more WHP.
Bear in mind that there is much more than adding power to these tunes. As you can feel, the transmission computer is also modified in several ways.
The noticeable additions include strategically raising the fluid pressure, which is what causes your tighter shifts.
These shifts not only enhance performance but it is a transmission protection factor.
As Adam mentioned, the longer it takes the shift clutches to engage, the more they wear in that duration.
When they slam together, there's no time for them to significantly wear, meaning those clutches will last longer.
As far as performance, I once had a Supra Turbo, on which a shift kit was installed and caused the same hard shift.
It actually felt like a horse was kicking the back bumper every time it shifted. I got to understand the significance of this when
I raced cars that used to run even with me but now, every time it shifted, I pulled a half car length on them. I now welcome that hard shift
every time it happens.
Conversely, it's not an around town driving wish for that to happen. Fortunately, with today's technology, that can be governed to your liking.
That's why it's an advantage to have the DMS tune wherein you can have normal mode, smooth shifting, performance mode tight shifting
or race mode hard shifting. Everyone drives home happy.
There's more training to your foot than there is to the transmission. Not only is the shift schedule modified and the gear change tighter but
the accelerator pedal is also adjusted so that it arrives at a higher throttle percentage at lower pressure. This adjustment is incorporated in
the more radical tunes, which is likely in the sport mode. That is one of the reasons it's more responsive in that mode.
So it's not just more power, it's more pedal and a higher RPM shift schedule. You also feel the downshifts more because they are tighter and
they are happening at a higher RPM on the way down than in a normal mode.
Also as mentioned, it's important to keep the trans fluid at the proper levels and even on the high side. When it is checked, it's imperative
that it's done at a higher fluid temp than most have been mentioning. The check fluid temp is done between 206° and 215°F.
The factory sweet spot is between 3 and 4.5 on the little dip stick. ZFG stresses keeping it on the higher side and maybe even a little over,
which would put it at 2.5 on the stick. Higher performance requires higher maintenance levels. (same with engine oil)
At 106K miles, this 2020 is still a beast and is running without a hitch.
Enjoy your STs!