Dino is going to be sending me his DIY-WB o2 controller soon, so i'll finally have the oppurtunity to copy the PCB and build my own. (the guy wouldn't respond to my e-mails for buying a PCB from him so i'm just going to fabricate one off of Dino's after i build him his)
Bill has slowly been convincing me to get a Mega Squirt, or for those of you that don't know it's kind of like the 034 EIC but it's designed to controll any type of injector - high or low impedance. the only thing that i don't really like about it is the fact that it only really controlls 2 injectors via a batch firing mode, instead of sequentally.
i've been thinking... is it at all possible to link some sort of wide-band oxygen sensor (in this case, the DIY wide-band sensor) to an 034 EIC or a Mega Squirt to have it learn and perfectly tune the fuel curve in open loop by it's own? for example... i could set a goal like this:
RPM: 2000 4000 6000 8000 A/F: 12:1 12:1 11:1 11:1
or something like that... the DIY wide-band would output raw A/F readings to some type of injector controller (along with MAP data, RPM, IAT, and crap like that but i'll deal with that later), and the injector controller would say "ok, the A/F ratio is suppose to be 11:1 but i'm seeing 10:1, i'll narrow the injector pulsewidth by Xms every 500ms or something until it's on target. then i'll remember what the final pulsewidth should be at this paticular RPM for next time."
this seems like a really good idea to me in which the car would basically tune itself perfectly in open loop. any comments?
The 034 EIC can control 1-10 injectors of low or high impedance if that helps you make a decision. I don't know of any cheap way give an extra injector controller wide band capability. I once pondered getting a fuel-only ECU with O2 sensor capabilities to drive my secondary injectors. The guy that sells the 034 EIC also sells such a unit: http://www.034efi.com/034ecu.html The cost is prohibative though. At that price, you might as well go with a full stand-alone system with O2 sensor input.
Corbin
'95 ESI-T HRC+FMIC+ETC...
Gimme fuel...Gimme fire...Gimme that which I desire
you know, i was just thinking about that the other day..be cool to use a dedicated wide band o2 to set a steady A/F ratio under boost, at any boost and rpm..that would be sweet as hell...
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
It's defenitely a good idea, but I don't think the wideband O2 sennsor would last long enough under constant, regular driving conditions. (which it what it would see, as all of us here don't have dedicated race cars) They aren't designed as ruggedly as regular automotive O2 sensors. And, they are far more expensive, so you'd be spending alot of money replacing wideband O2 sensors over time.
If you are planning on using the megasquirt, I wouldn't worry so much about the fact that it is not sequential. I know sequential is better, but cars have been running on batch injection, throttle body injection, and carbuerators for a long time, so I think you'll be ok
The GEN 6 DFI HRC sells, the 015013, is batch fire. Works fine.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
Dark0ne95: There is a butthole on that girl that his going to feel the wrath of 23 yeras of worldwide hate. Me: Can I put that in my sig? Dark0ne95: GO right fucking ahead.
there was talk about wideband conversion for the mnega squirt on the forums for MS
check it out i dont remember what all was said..
Bill
the mega squirt is nice cause u can build new parts add them in and program them its like open source for tuning =)
You can have it cheap, fast or good. Pick any two.
If you want it cheap and fast, it's not going to be good. If you want it cheap and good, it's not going to be fast. If you want it good and fast, it's not going to be cheap.
I talked to an engineer who works at GM and basically what he said was that sequential helped a small amount below peak torque and improved idle and emissions. No increase at peak hp. Injection timing per cylinder was also found to work the best shooting at the back of a closed valve, probably a tradeoff in mix temperature and quality of mix. If you're really worried about it, you can hack the megasquirt or at least set one bank to 1,3 and the other 4,2.
Yes, some Hondas used a Lean-Burn motor, and a wideband O2 sensor. More information can be found at www.diy-wb.com . Making the Megasquirt run 1-3 and 2-4 wouldn't really be a hack, either. Just a matter of rewiring the injectors, not that I have any experience with that. The MS doesn't give a shit what it is driving. It just sends out a pulsewidth, and whatever is connected to it will fire. I don't have a problem with the slight idle and emissions issues that may result from batch-firing in two banks. Beats the hell out of TBI, which is marginally better then a motor with a Carb. Hell, there are motors with carbs making TONS of power. If that can be accomplished with a carburator, imagine what can be done with a better system (dual bank multiport fuel injection). -=B-=
Dude, Boeing called. They want their wing back.
Dark0ne95: There is a butthole on that girl that his going to feel the wrath of 23 yeras of worldwide hate. Me: Can I put that in my sig? Dark0ne95: GO right fucking ahead.
Thats what i'm sayin. AFAIK the MS has two batches so its simple to run 1,3 & 2,4. It would be a hack to run sequential and it wouldn't gain you anything more than a smoother idle, lower emissions and a very slight increase in power below peak torque. Probably not worth it.
BTW, Fuel injection does not necessarily make more power. It is definately smoother quicker to tune, but a carb generally does a better job at air/fuel homogenity.
My point about the WB O2 was in reference to VX100s post above.