Very, very cool cribbj...
I have the SRI gold connector kit on my F355 (2.7 Motronic). I'm not so sure I'd be interested in the whole kit as I no longer get transient warning lights and feel confident that the Motronic brain is getting correct readings/signals.
I would however be curious to know if you could develop a "smaller kit" that only replaces the Cat ECUs as those are still a weak point on my car. In other words, I'd potentially be interested in the "guts" but not the display module and SW that drives it.
Thoughts on offering a product like that?
Thanks Rick, actually you're the first who has expressed an interest only in a module without display to replace the Cat ECU's. The 'gist I got from most of the owners who participated in earlier discussions is they wanted the protection functions and a display. You can still have "only" the protection functions with this instrument - just don't run power to the lighting circuit, and it won't light up
then if you don't want to see it, you can tuck it somewhere up in the dash, or under the seat
But seriously, if there's an interest in having only the "guts", I'll approach Aerospace and others to see if they'd be interested in doing it.
So does this unit repalce both cat ECU's in that it intefaces with the Motronic? Would you still get the "Slow Down" light if temps get too hot?
Yes & yes. This single unit replaces both cat ECU's and it has to be either wired into the harness where the cat ECU's were, or wired into the ECU connectors. I'll be detailing this part of the installation with pics and/or video when I do my unit.
The 348 is not listed as a recommended use model. Any reason why?
Lane, only because I wasn't aware your 348 was equipped with these Catalyst ECU's? Or did I misunderstand, and you're interested in it only for EGT monitoring? Note to all
: one of the ways we were able to keep the cost down on this unit plus add the display, the datalogging and the other features, is to use embedded microcontroller technology, so this unit doesn't put out a continuous analog signal like the OEM catalyst ECU's do. This instrument will put out 3 different discrete voltage levels that equate to Normal, Slow Down Alarm, and Slow Down Danger levels. These three different voltage levels are all the Motronic really wants to see anyway - the continous voltage variations between these three levels are meaningless to the Motronic ECU's.
So when the cats are in their "normal" temperature range, this instrument will put out 2.0v and this will keep the Motronic ECU's happy. When a cat's temp goes above the "alarm" setpoint that you have programmed, the instrument will then put out approximately 3.83v, and the Motronic will trigger the flashing "Slow Down" alarm. Then if the cat's temperature goes above the "danger" limit that you've programmed, the instrument will put out 4.096v and the Motronic will trigger the solid "Slow Down" message, and it will kill the power to the injectors on the offending bank.
I've measured and confirmed the "trigger" points of the Motronic inputs in the past, and these values will have the desired effect.
This method of signal generation also improves the accuracy and repeatability of the instrument, in that the millivolt signal of the thermocouples goes directly into an A/D converter, then is displayed, rather than having to be linearised and amplified in the classic manner by analog circuits that are subject to drifting due to temperature, age, voltage instability, etc. The output voltage from the unit comes from a corresponding D/A converter, and everything between these two components is completely digital.