It's been some time since I've posted... And in many ways I feel like I got off track on the enjoyment I get from simply doing mods on my car... I got involved in another forum (mostly to sell things) and I find that after a year I've lost touch with simply enjoying my car and working on it. I also miss the folks here on this site... It really is the best forum for getting to know people and sharing our common love of these cars...
Although there are so many things we can do with our cars, Lately I've become more interested in doing technical modifications. My 300C is the only automatic transmission car I've owned in the past 20 years. And needless to say I was not completely happy with the shifting strategy of the car. The transmission shifting program is designed to increase fuel mileage. It simply does not have much of a "Sporty" feel to it IMO.
There have been a number of devices cretaed that increase the "Firmness" of the shifts but they do nothing to change "When" the car will shift. This lead me to thinking, why not build a programmable shifting system that you can adjust to your liking? So that's what I did. I call it the VTCM. (Vitruial Transmission Control Module) It actually ended up being a group of modules in the end... A system per-se.
I did run a VTCM beta program last year but I've decided not to sell this system any longer. Mostly because It is something that I work on all the time... And frankly, I enjoy it more as a personal project.
The current build is called V2. And it is VERY different from the beta systems in both programming and hardware. I'm very happy with the V2 but already see things I want to do for V3 LOL...
Anyway, Enough talk... Let's toss some pictures in here too...
* Here is a picture of the pre-Beta system. The thing that really stood out with that system was the mess of wires involved. It actually would take me close to 3 hours just to make the harness. It also required 9 wire taps to install in the car.
*So for V2 my goals were to increase performance, streamline the design, and minumize the number of wire taps... Here is the result...
The V2 system is a "Plug-In" system that plugs directly into the TCM. This dropped the number of wire taps from 9 to 2. The only taps needed are for the CAN B-Bus about one foot away. And because the Main SFC board is physically between the TCM plug and the TCM itself, I was able to increase the control effect of the shift and modulation pressures from 82% to 100%. In other words, it works better with less stress on the TCM...
* Here is a picture of the Main Controller (Brain Board) in it's protective rubber boot... I like to keep it in the glovebox where I can easily remove it and bring it in the house while I continue code development. It's quite small and will fit in the palm of your hand.
Here's a photo of the V2 SFC Board plugged into the TCM. Only 2 external t-taps are needed for the B-bus under the steering column 1 foot away...
*In this photo you can see a small angle bracket added to the bottom mounting screw for the TCM... The SFC Board screws into this bracket for stability and to make ground...
*Here is the SFC board plugged in and screwed in position
*Two taps to the B-Bus and plug in the Controller and we are good to go :-)
So in the end what do I get from this?
A fully programable shifting control system that controls...
- Upshift points (limited by the TCM hard limits)
- Downshift points
- Wireless paddle shifter controler (No wires in the clockspring needed)
- (Pause / Engage / Gear Hold) via Cruise control wand movements
- Two saved modes of control that can be moved between on the fly
- Full management utility that controls settings, graphical monitoring, datalogging, and data playback for analysis.
*Here's a picture of the opertion as seen in the graphical view on the management utility. In this case I was looking at why there seems to be more of a flare on the 3>4 shift then there is in other gears. You can see it in the higher then normal modulation pressure increase during that shift...
Anyway, Just thought I'd share my work and want to say I love this project. I've not driven my car in "D" for almost a year now. I would not want to drive my car without this little mod I've created :-)
Thanks for looking... Cheers!