I am posting this here inspite of the fact that I want to start MS naturally aspirated and go turbo later BUT...
1) Are you running Wide-band or Narrow-band, and what value do you have your EGO set at? The manual says to set it at .45 - .5 for narrow and about 2.5 for wide, that sounded to small for narrow band to me, is this a center value?
2) How do you calculate ignition events for the o2 step%? Im still not getting that concept.

Representing the Central Cali chapter of 2GNT!
(I think I'm the only member )

he runs a tech edge wideband...not sure of settings though

as for ignition he is working with the ford edis setup not ours.

Terry

96 Eagle talon ESI
Star Stage II - Boost/oil/EGT gauges

97 Eclipse
Greddy header - Apexi N1 3" exhaust - SFMU/return line - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: Apexi AFC, HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

Mitchell on Demand copies available

Yeah, I heard about the EDIS thing, but Im not sure Ill go after that quite yet. I'm almost thinking about the MSD programmable DIS-2 unit to make it easier, but that will come in due time. Im pretty sure those values are a center setting ( .5 for the 0-1 volt narrow, 2.5 for the 5 volt wide) but wanted to make sure.

Representing the Central Cali chapter of 2GNT!
(I think I'm the only member )

Howdy,

To answer your questions:

I was running a narrow band with the old setup... but as pointed out my new engine will be using a techedge wideband... yay.
The switchover point should be set to 0.5v for narrow band. The reason being is that where stoich is at on a narrow band... when in closed loop you want to swing either side of that value... just like the stock ecu does.
As for the ignition steps numbers I don't remember off hand.
I'll tell you this though... those numbers are the leassst of your concern.

You will have most trouble finding a good rpm signal, and getting the accell enrichments set good.

For the ignition trigger if you do not modify the MS (I'll tell you how later) then you must use one of the two coil pack trigger wires for the rpm tap. This then means that you have to tell the MS that the motor is a 2 cylinder...

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Megasquirt powered 420A
Custom turbo system

http://www.ms-custom.com

Originally posted by MrSlickthen you must use one of the two coil pack trigger wires for the rpm tap. This then means that you have to tell the MS that the motor is a 2 cylinder...

Representing the Central Cali chapter of 2GNT!
(I think I'm the only member )

OK, More questions, I have been reading the manual A LOT (Im on my third time through taking notes) and I wanted to know a couple things. Dont worry, more questions will come. Here goes:

1) Are you using GM sensors or stock sensor? If stock, where did you get the EasyTherm files?

2) What did you do with the stcok injector harness? Did you get any CEL's? Did yoou have to wire in any resistors?

3) What sensor did you use for IAT? Since you're turbo Im assuming you went to an open cage sensor. Did you leave the stock one tied into the stcok ECU?

4) A little off topic, how did you run the fuel regulator? Can you tap into the back of the fuel rail with an AN fitting, or did you have to go off of some sort of pressure port?

Alright, thats all for now. Thanks in advance, I know it's a lot of questions but I want to go in with as much knowledge as possible. I hope to have the MegaSquirt put together and on the car in a month and I'll be running it NA for a while to learn to tune it more and to see how much it will do for a non boosted engine. OK, back to work.

Representing the Central Cali chapter of 2GNT!
(I think I'm the only member )

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Megasquirt powered 420A
Custom turbo system

http://www.ms-custom.com

Thanks for the help guys, I really appreciate it. Tell me how the resistor thing goes. I was told by an elec. engineer friend of mine that fuel injectors act a lot like inductors and so, if the computer is paying too much attention to the injectors for resistors to work then maybe that ought to be tried. And as far as this mod to MS for ignition, do I need to get a bootloader or something for this, I want to have everything before I put it on. On a side note, I'll probably not beat Grain to the proverbial MS punch, but I'll definately be the first to run it NA , and thats gotta be worth something.

Representing the Central Cali chapter of 2GNT!
(I think I'm the only member )

you are dealing with a DC current so inductance is not going to be an issue. Inductance only plays a part in AC current due to the 60 hertz cycle that our electricial system operates at. the inductance causes the phasing to distort hence the reason Capacitor banks are installed on three phase ovhd electrical systems. The capacitor counteracts the phase distortion cause by three phase motors and equipment. (these motors act as inductors to the system. With DC there is no cycle rate therefore the voltage and "time" is not altered/distored.

I am not the best at explainign this without diagrams and picture but i hope this gives you an idea why you would be able to substitute resistors in place of injectors.

Terry

Best way to understand is to view AC on an occilloscope.
Inductance causes voltage to lag the current. When capacitance is intruduced into the circuit the voltage will lead the current. In DC current there are no cycles, therfore no problem. 12v dc stays 12v dc constant. in AC current each phase cycles at 60 hertz, goes from 0 v to 120v to 0 and back to 120 60 times a second (120/240v residential circuit for example)

96 Eagle talon ESI
Greddy header - Greddy exhaust

97 Eclipse
Star Stage II - Boost/oil/EGT gauges - Apexi N1 3" exhaust - SFMU/return line - Apexi SAFC - Stage 2 6 puck Sprung hub MIBA clutch - Shortened shifter - Koni Yellows w/eibach prokit - Stillen Fr/Rr swaybars - ceramic intake - DEI Keyless entry alarm - Niche 17" Shoks

Waiting to be installed: HKS EVC IV, 450 Turbo injectors, GSX Front brakes (need rotors)

Mitchell on Demand copies available

Im not an electrical engineer by any stretch, but that made some sense. Is there a simple formula for figuring out how much of a resistor to use? Does impedance really matter for this formula or just the ohm rating?

Representing the Central Cali chapter of 2GNT!
(I think I'm the only member )