Cybaster

Hello, i have finally discovered the wonders that the MS has to offer, and i have a few questions for everyone here ( since u guys know more than me on this)

#1 so let me get this straight, the MS is a DIY stand alone, not a piggy back?

#2 it includes a 2.5 bars map sensor, so does that mean i can ditch the MAF sensor on my TII?

#3 i read in MS's info site that it can handle narrowband O2 sensor. I saw in one of the pictures of the program it has a full A/F ratio meter, so does that mean I need a WideBand 02 or is it unnecessary?

#4 i really dont' want to go premix, that is why i wanted to get a PowerFC before. But if i have to, i guess i don't mind..... I saw in the following post:
https://www.rx7club.com/megasquirt-forum-153/ecu-plug-also-ac-cruise-questions-517289/
that you can use the stock ECU for Cruise control... can u also control the OMP then with the stock ECU, and the rest with the MS?

#5 i see the MegaSquirt I and MegaSquirt II for sale everywhere, if i want to get the DIY kit, which one should i get?

thanks
That is about it right now...
Jonathan

renns

Standalone.
Ditch it!
[quote]#3 i read in MS's info site that it can handle narrowband O2 sensor. I saw in one of the pictures of the program it has a full A/F ratio meter, so does that mean I need a WideBand 02 or is it unnecessary?[quote]In order to get meaningful AFR readings, you need an aftermarket WB02 setup. MS can be configured to work with virtually any WB out there. Note that you need to purchase separately the WB and controller. It's theoretically possible, but would be a science project. Plan on premixing, or convert to an old style oil injection system. V3.0 kit with MS-I chip.

Roger.

muythaibxr

Read the FAQ as well. At least some of the questions you asked here, and most of the questions I'll bet you're going to ask are covered there.

West-se

I thought the OMP was controlled mechanically and not by the ecu ?

Rex4Life

S4 and S3 versions were mechanical, S5 (and up I think) are electronic control.

West-se

I was scratchin my head wondering wth, kuz mine is sure mechanical unless theres some hidden circuitry in there. Wouldn't then a sollution to avoid premix to use a mechanical pump of an FC or FB ? I know mine is simply activated by a rod on the throttle assembly.

Cybaster

you S4 guys have it easy =D
well I am really leaning towards the MS, so i wanted to get the most info as I can. Thanks everyone,

as for the premix, i know it is better for my car as well (burning cleaner oil, etc) and it is not too much of a hassle (compared to building the MS =D ) but it just seem like one of those ( it is in the car, so i hope to retain it ) kinda things....

well i am always up for a science project, so i'll have to look into IF i can configure it so the old ECU can run the OMP =) if i can, i can have cruise control too.... if i can't then no Biggie =)

thanks guys

muythaibxr

The first car I megasquirted was an S5. We just got rid of the factory ECU (and cruise) and premixed. I'm sure leaving it in can be done... but I've always thought most piggyback installations I've looked at are pretty messy.

Running the OMP off the factory computer will require you to leave the wide-range TPS hooked to the factory computer. I don't think you can share the signal on that, but you can just hook the narrow range TPS to the MS instead...

Also, you don't HAVE to use a tps at all. A lot of people are having pretty good luck with the MAPdot accel enrichment code. The only things I really use a TPS for in my installs anymore are to engage fuel cut and idle advance.

Cybaster

Thank you for the input,

I know Slpin said in the 2nd gen that he did a install before leaving the factory ECU in to allow for the OMP.

Well then I'll keep up my research, and once I get it, i'll be asking for a lot of help ^___^

thanks again

muy, would u know what paramenters aside from the Wide Range TPS is needed?
and since i'll be using the MAP sensor with the MegaSquirt, the MAF signal would be gone correct?

I believe i'll make it so that the factory ECU would be the "piggy back" to the MegaSquirt, controling possibily only the OMP and maybe the Cruise Control. if that theory indeed works ^___^

slpin

iTrader: (9)

it would work...

2713ddddavid

iTrader: (1)

Cybaster,
The cruise control, I found out, has its own box completly seperate from the ECU, your Megasquirt will not have any effect on it working or not.
AS far as the OMP is concerned in the S4 its mechanical, in the S5 its controlled by the ECU. As others have stated here there are ways around that. I don`t know what they are as I`m S4.
If you are S4 AND your A/C still works AND you plan on keeping it, then you must jumper the wires at terminals 1E and 1F. (see pg 4A-32 of the FSM). I don`t know about S5.

Cybaster

well i am an S5, and i have read that (from Slpin)using the stock ECU as a piggy back ( to control the OMP) would work. so i will have to experiment and tell everyone the results!

Black91n/a

I'd want to be able to control the OMP with the Megasquirt. Would there be any possibility of that? Is it just a stepper motor, or is there some complex circuitry in place that would prevent some sort of motor control from being designed into a daughterboard or even a sperate controller?

I'm seriously thinking of trying this out one of these days when I get some cash to play with, but there's still some things like that that hold me back from wanting to take the plunge.

Cybaster

controling the OMP from the megasquirt don't seem to work. but i guess there might be a day that can do that =)

but the other way of thinking is, rather than using a piggyback fuel controller like SAFC or Greddy E-manage, u can have full control of everything, except the OMP. So the stock ECU can do that specific task.

in a few weeks, i'll buy the megasquirt and build. i'll check all the inputs. as Muy said, the OMP probably need the wide Range TPS on the stock ECU.
but from the looks of it, using the stock ECU to control OMP is very do-able ( its just that supposedly it is cleaner to pre-mix anyways )

besides, i think the benifit from the megasquirt is so much more than the hassel of premixing so if this doesn't work for me, i won't mind....

i'll keep everyone updated