I agree, but whether we have that code in the same release as the timer based stuff I'm not so sure about. Once you have code switching 8 channels with 2 timers, you can keep sequential for staged ones provided that the end time is the same (or start time) and use only 3 timers to do that control. 4 for water if it also has the same end point etc.seank wrote:I think seq on at least 8 would be a big plus. You could batch fire a second set of injectors and as long as you didn’t max out your seq controlled set, you can still have individual cyl fuel trim control.
Exactly, and although they might be semi common, they aren't heavily used by low budget DIY types looking for insane power are they. Like you say, V8 is the common choice for easy reliable silly power over there. At home it is boost and RPM on rb/2jz/3sg/sr20/etc that is the common choice for fast cars with fuel injection. (like your 8's are cheap, our jap market imports are dirt cheap too)Not likely, 10 cyl maybe (ford/dodge v10s are somewhat common in some countries, but most people that need big power chose V8s).
I'm adamant that we should build a fuel/ign controller with good accessory control. Trans seems to me to be a whole application of it's own. I'm wondering if you have seen lances/James trans controller stuff? A member on msextra called devojet is using a 90usd ms2 card and some perf board to control his toyota trans. the gpio board might cost around 150us when/if it comes out. our cpu card alone is 125us +p+p, might be cheaper easier more fun to do it that way rather than try to hack it into the middle of the ecu code. I'm keen for traction control, and wheel speed logging too, but I don't think we *need* timers to do it reasonably.Traction control would be a nice feature especially for real race cars. Having an idle rpm/MPH table would be neat, that's one reason I let the stock ecu control my iac valve. With vehicle speed we could do transmission controls too, a typical auto trans controller sells for several hundred US dollars.
So am I, but the answer to your question is a surprisingly large amount, at least if you stay freescale it is. 500us or so for an mpc555 (designed to run an engine) on a proto card not suitable for use in a project like this. The beauty of the tech art card, and the reason I/we went with them is the packaging. BTW, there are three of us with the xdp512 adapt cards now :-) picking up momentum! The xep cards are cheap, but also not that useful for integrating without major mods. The adapt card can be a plug in solution with the possible exception of replacing some tantalum caps that are 16V with 35V ones.Im a big fan of doing more with less, but how much more would it cost for a fully qualified MCU and when you factor in how much you spend on the average project does it really cost that much more?
YES!! and a good thought, I'm glad you feel the same way :-) BTW, if you bought both the 40us xep100 card (assuming the pin count is the same) and the adapt, you could graft the new chip on. Most of the key pins probably line up the same. Freescale are good like that.It would seem to me that the seq/semi-sqe model can be extended (much of the code resued) in the future on hardware that is more capable. When that times comes it seems like all other methods may become "effort better spent elsewhere" just a thought.
I intend that the output board will have 24 power devices built into it (provision for them anyway) another board can be sandwiched on for more. I think there is no reason that the BASE (have to keep reiterating that it is a BASE for others to work from and extend) couldn't be brought up to any arbitrary number of channels later. The compromise would be much less logging, and loss of accuracy from excess load.I would be very happy with 18 outputs(8ign, 8 seq,1 batch fuel, 1 batch meth), but I dont have a problem with semi seq model at this time.
I'm glad you feel like that. I think we need to hone in on the angle of attack and commit to it. I thought I had, but you lot seem to have some other ideas :-p (not pointing the finger at anyone in particular Jean ;-) )I'm definitely not the most experienced hardware/software guy on this board but , I would rather see this project grow with the hardware rather than trying to do too much with too little.
We can't spend forever discussing how many channels for what under every random combination of engine/trigger/setup etc. We need to make some decisions and lay down some designs.
I propose that we stick with this for now :
6 timer injector channels running seq or semi seq
6 staged injectors with a PIT controlling start point, and ECT end point at the same time as main
12 ign channels controlled by two PIT timers
leave sequential V8,10,12 for later
leave full hard core siamese control for later
leave water injection for later (its a hack anyway, run good fuel or drop your compression to a reasonable level, too many people are too hung up on high compression at the same time as boost...)
Note, I'm not saying don't do them (do absolutely anything at some stage) I'm just saying don't do them now.
How does that sound to you two that care : Jean, Sean ?
Next...