DIYEFI.org Forum

I don't think a 150 dollar ignition module should be a deal breaker in a performance engine build, but just for the benefit of those wanting to keep the original equipment, I guess a concession could be made. How about an ORing schottky for +5v and an externally switched FET driver for +12v(ground a...

I think the key difference is the Bosch unit is a triple-tier darlington vs. the regular two-tier; 22mA vs excess of 300. I guess the question boils down to this: I understand the reasons behind maximum flexibility, but it too is a coin with two faces. It increases the board complexity, it adds to t...

Yeah, I read and acknowledged that FETs should be used. If it didn't come out in the text correctly I apologize. I'm a bit at loss here. Bosch datasheet states +5v signal on the darlington base. Then again I've read about the +12 volt needed on darlington here. So is the manufacturer wrong with the ...

Yeah, I got a little confused there for a minute. Of course the system isn't inverted; I guess I'm not at my sharpest at midnight anymore. Anyway, the actual transistor for the ignition module driver is going to be a FET and not some odd throughhole BJT. The provided schematic was a nice gesture fro...

Figuring out the high current drives. So yeah, higher resistance internal resistance with IGBTs is bad for the injector response time with 12(14) volt system. Going for MOSFETs this time. The VNx14NV04 would indeed seem like the ideal choice, the TO-220 package version is VNP14NV04. The injector cir...

No seriously, I want(need!) to know the problem with injectors and IGBT's. Datasheets and example projects don't seem to indicate such issues, in all it's pretty much a MOSFET input, BJT output type of deal. Flyback diode arrangement is different since there none inherently in the device, but extern...

Ah, so there was to summary of the available features. And as I thought, I have a couple of feature ideas without firmware support (yet?). The blank faceplate option was explored, turns out for all of the options headers (that I found) overlapped with the PCB holders on the faceplate, so that didn't...

Hardware layout You don't design the board before doing the schematics, but the two do go somewhat hand in hand, and here's my take on the PCB layout. Top layer is for the really sensitive signals and most components, and is zoned for each function group; CPU is at the signal hub. The second layer i...

After a lengthy hiatus from most car-related activities (post-layoff blues and weariness and lack of funds with the engine build) I've decided to properly take on a FreeEMS HW implementation. To keep the feline themed naming, I though to use simple "Wildcat", googling "wildcat engine ...

About which devices to use SPI... basically, you want to keep SPI devices within the ECU enclosure. For remote equipment you'd want to use RS-485 or CAN. I had the idea about SPI addressing using a demux and buffer chips. What it'd do is you'd enter the bus address with an SPI message to the handler...