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...

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.

Howdy,

I'm looking at using the megasquirt myself...
I think for the price you can't go wrong....

Lee.

Told ya, Nate... hehe... <sticks out tongue>
:thumbsup
-=B-=

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 =)

Aren't there some Hondas that run WB O2's stock?

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.


-=Whittey=-

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-=

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.


-=Whittey=-

Well, the latest trend is toward direct port injection. That's neat stuff. Anyways, I believe deeply in the Megasquirt, as it is the best bang for the buck in fuel management.
-=B-=

I'm ordering my Megasquirt today...

If you guys like I have no problem acting as a test subject....lol, might as well wait till I have mine up and running.... but I'm predicting awesome results.... the capabilities of the megasquirt are actually beyond what the EIC controller that most people use around here..... we shall see.

Lee.

Keep us posted. I really like the fact that it can read so many sensors. I may have to switch over in the future.

Corbin

'95 ESI-T
HRC+FMIC+ETC...



Gimme fuel...Gimme fire...Gimme that which I desire

i have confirmed that the megasquirt does use input from a wide band signal its specifically setup for the DIY wb kit also...

i think that the mega squirt being setup like linux and open source where u can add anything u want is the best option...

Bill

maybe ill get one isntead of a smt6 anyone want to put mine together ??

Bill

i can solder well. for a small fee, mail it to me and i can throw it together for you.

ner hit me on aim and maybe we can work sumtin out =)

wanna make me a knock sensor add in that works with the mega jolt?

Bill

mabye if it had an option to *learn the curve then remove the wb o2 so it does not get worn out.

the o2 sensor it uses is a 28$ o2 froma vw or a honda and its oem equipment i wouldn't worry much about wearing out...

Bill

lookup lm-1 it has the part numbers for the vw 02 sensor