fstrnyou

MS1 v2.2 MSnS-E 029t

i'm in the very beginning stages of the install. right now, i am only monitoring the sensors to make sure everything reads correct before i try to run it with MS.

only thing i've noticed so far is that the Tach in MT reads "0". i have the RPM signal wire going to the negative lead on the T1 coil. is that even correct? i haven't checked continuity between the negative lead and the MS yet. there may be a bad connection somewhere. any help would be appreciated.

FSTRNYOU

muythaibxr

Are you trying to run ignition? fuel only? what exactly are you doing?

Ken

Aaron Cake

iTrader: (1)

Do you still have the stock ECU installed? That's the only way you are going to be getting a signal at the ignition coils if you are intending on using the Megsaquirt as fuel only. I assume this is what you are doing since you are using the RPM input wire...

fstrnyou

yes, fuel only at the moment. the injectors aren't attached to the MS yet, but everything else is.

with the exception of the o2 sensor and injectors, every stock component is will be attached to the stock ecu. i have dedicated sensors for the MS. GM temp sensors and s5 tps. The analog 2 output of the LC-1 will go to the stock harness.

i read somewhere about putting a 50k resistor in the tach signal wire tp minimize/eliminate tach spikes. i already had on hand some 47k 1/2 watt resistors so i used one of them instead. do i need to take this back out?

and just to clarify, the two wires going in to the T1 coil....i measured the top one as positive and bottom lead as negative. i did this with a DMM while cranking. set to DC volts, i put the black lead on the bottom and red lead on the top and it measured a positive voltage. which means i had the black lead on the negative and red on tne positive. am i correct in my assumption? another thing, am i supposed to be using the trailing coil? or should i run it up to the leading coil? is there something in the code that i have to set so that MS knows how many sparks per revolution to determine RPM? how does MS knw?

Trailing coil - 2spark/2rev
Coil on plug- 1spark/2rev
1 coil on 4cyl-4spark/2rev
1 coil on 6cyl-6spark/2rev
ect. ect.

Thanks again for your help. I built this MS two years ago and it's been sitting in my closet since then. I'm excited that it's finally going in and for the most part, it's working.

Aaron Cake

iTrader: (1)

Connect the RPM input to the yellow/blue wire at the trailing.

If that does not work, then connect to the negative of the leading coil (the actually connection on the coil itself will be marked with a - symbol).

You will also need to jump the appropriate jumper on the Megasquirt (X1 I think, but check the manual) and install the Dave capacitor.

fstrnyou

i measured the coil leads, and they're getting 12v continuous with the key on. so anyhow, i looked through the FSM to find out what the stock tach runs off of. as you just mentioned, yellow/blue wire. that didn't work either. so i check to see if i'm even getting signal to the MS and i am.

didn't know about the jumper. by check the manual, you mean the MegaManual?

also never heard of the Dave capacitor either. time to search.

Aaron Cake

iTrader: (1)

Yes, the MegaManual. It covers the appropriate jumper connection as well as the Dave capacitor.

fstrnyou

Found it. I'll be getting that squared away sometime today. As well as figuring out why my TPS is reading wrong. Also found in the megamanual about how to figure out what wires are what on a 3 wire TPS.

I just assumed the Br/B was ground, Br/W what 5vref, and the other wire was the signal wire. but i don't think i hooked it up that way though. i'll see when i'm under there.

Thanks Aaron for the help.

the only thing is, i can't even hook this thing up fully until i figure out why my car won't run right. but that's a whole new thread.

fstrnyou

got the TPS working...

still no tach in megatune. no blips or anything. removed the jumper from XG1 to X11 and ran a jumper from XG1 to XG2. i wasn't going to use the Dave cap unless i noticed problems with the signal.

any other sugestions? what am i doing wrong?

Aaron Cake

iTrader: (1)

Do you have the software set up right? If I remember correctly you need to set the ignition to "Distributer" mode.

fstrnyou

doesn't much matter now. i figured it out. it seems the Y/L wire is a variable 0-5v signal wire to operate the stepper motor tach. wich is not appropriate for the megasquirt as this isn't the type of signal it's looking for. there is a very similar wire coming off the leading coil. black with the same female connector as the trailing coil took out the resistor and wired the tach input wire to that lead and bingo. tack works in MT because the coil is outputting a 12v blip blip blip signal. actually reads about 50-100 rpm low which through my reading is normal.

as a matter of fact, i hooked up my injector harness up to the MS and it fired right up. idled smooth as heck at 55-60kpa at 52%VE. had to turn off all enrichments and EGO correction to do it because my temp sensors aren't installed yet and the wideband isn't calibrating right.

ok, end of thread. use black lead on leading coil as tach signal for megatune.

Aaron Cake

iTrader: (1)

Sweetness. Glad to hear you got it going! It's nice when it finally fires and runs (just gold a Wolf3D equippe car going that we had been battling with for a month last night...).