a_reyes1014

iTrader: (1)

i was wandering how can i troubleshoot to see if the leading is getting a signal? im not getting any spark to the leading and wanted to know what else should i check besides the jumper from D14 to IAC2A. i just installed the ms and got the car to start right up but not getting any from the leading.

muythaibxr

I would check for continuity from the - lead of D14 to the plug that goes to the leading coil to begin with.

Ken

a_reyes1014

iTrader: (1)

never mind i had an extra coil laying around and just found out that the coil was bad. next question is i have 1000cc rc low impedence injectors, do i leave the injector settings alone with what the instructions tell me to set them at?

muythaibxr

Are you using those as your primaries?

I would recommend using them with a resistor pack. If you let the MS control the PWM settings, you'll have to do some extra wiring to avoid noise issues.

Ken

a_reyes1014

iTrader: (1)

yes they are being used as primaries.
how do i wire them in?
resistors inline?
and what resistance do i use inline?
what do i put in on the injector characteristics page?

muythaibxr

The resistance for the resistors depends on the impedance of your injectors. I normally just wire them in on the +12v supply to the injectors.

If you use resistors, you just put 25.5 and 100% in the injector characteristics page. Otherwise if you want to use the PWM features, you'll probably want to do a few things:

1) wire a second +12v return for the flyback circuit to an external +12v (so flyback doesn't go out the normal MS +12v input causing noise).
2) follow the instructions in the megamanual for setting the PWM parameters
3) try to get the opening time of the injectors nailed down as close as you can, 1000cc injectors are going to make it hard to idle or cruise at low pulse-widths.

Ken

a_reyes1014

iTrader: (1)

all four injectors ohm out to 2.5 ohms.
so how much resistance should i add in there for all four?

muythaibxr

Since you wire primaries and secondaries to separate channels, and primaries are parallel, and secondaries are parallel, that halves the resistance to 1.25 Ohms on each injector channel.

That gives you 11.2A at 14V.

To get to 5A total, using Ohm's law (V=IR) you get a resistance of 2.8Ohms, but then the injectors are already 1.25 Ohms, so 2.80 - 1.25 = 1.55.

You'll want to make sure you get properly heat-sinked resistors, as they can get pretty hot.

This of course is assuming that my math is correct.

Ken

a_reyes1014

iTrader: (1)

hey will 2.5 ohm resistors be ok with my injectors? i found these laying around and i have it set to 25.4 and 100 %. i have them in now and so far everything seems to be working ok.

a_reyes1014

iTrader: (1)

also whats the procedure to calibrating the stock iat and clt sensors. it seems to be reading higher than actual temps.

muythaibxr

The procedure for sensor calibration differs depending on whether you're using ms1 or ms2... I don't remember which you're using.

2.5 ohms for the resistors might slow down the opening times a bit, but if it's working, then go for it. Just make sure they don't get too hot at higher duties.

Ken

a_reyes1014

iTrader: (1)

im using ms2 2.1.x to calibrate

toplessFC3Sman

iTrader: (1)

With MS2 2.1.x, you just need to go into Tools/Calibrate Thermistor Tables, and fill out the values for your bridge resistor, and three resistance vs temperature points. I know that these have been posted on here before; For the coolant sensor, you should use the normal MS resistor at R7 of 2490 ohm, and the three points are:

; Temp, degC Resistance
; -20 16200
; 20 2450
; 80 320

For the intake air temp sensor, you should use a bridge resistor of 47000 ohms at R4 (if you dont have exactly this resistance there, input whatever resistance you installed, but it should be approx 40k-50k ohms), and temperature inputs points of:

; Temp, degC Resistance
; 20 41500
; 50 11850
; 85 3500

a_reyes1014

iTrader: (1)

hey i forgot to ask if using these resistors should it be safe to to put 25.5 and 100% in the injector characteristics page.

and thanks for the numbers topless.

a_reyes1014

iTrader: (1)

ok guys what triggers ase? everytime it goes off it leans out crazy.

muythaibxr

ASE is After Start Enrichment. It turns on just after start for the amount of time that you specify.

If the engine runs lean after ASE turns off, richen up warmup enrichment (assuming the engine is cold) or richen the VE table if the engine is warm. After the engine is warm you can get the VE right and then redo the warmup enrichment.

Ken

a_reyes1014

iTrader: (1)

well it turns on randomly when i rev it to maybe around 2000-3000 rpm. and i notice its only when i rev it.

a_reyes1014

iTrader: (1)

hey ken also not questioning your math here i just checked out the megamanual site and computed what i needed for resistors inline with my injectors on the site and it says i need 10.6 ohms resistors to eliminate pwm and just set it to 100% and 25.6.

toplessFC3Sman

iTrader: (1)

im not sure why you'd want to eliminate PWM and proper low-impedance control of the injectors. Not only can you get more flow out of the same injectors due to shorter opening times, but because of the current spike to achieve those opening times, the injector is less likely to stick closed. They can cause a little bit more noise, but i've never noticed that to be a problem.

a_reyes1014

iTrader: (1)

ok so should 30 and 1.0 be a good starting point for the injectors?
im sorry for the newbie questions im just trying to get this right and not burn anything out.

a_reyes1014

iTrader: (1)

meant to say should i set it to 30 and 1.0?

a_reyes1014

iTrader: (1)

ok i figured out why i kept seeing the ase turning on. im losing sync and its falling out at around idle to 2000 rpm. i tried the noise filter settings and it still loses sync. my question is im using the relay board along and i know the relay board wiring harness to ecu doesn't have shielded wire. my 24 tooth vr sensor ground is going into my clt return slot on the relay board. should i move this to another spot or ground it somewhere else?

muythaibxr

When I calculate it there for 2 of your injectors at 2.5 ohms (comes out to 1.25 ohms total resistance) injectors, it comes out to about 5.6 ohms, which is half what you're getting.

If I calculate it for 1 injector per resistor, it comes out even lower still, at 4.5 ohms...

Are you assuming a 1A hold current? It is better for opening time to err on the side of lower resistance (higher current) in my opinion.

I'll stand by my calculations since I did them assuming one resistor per 2 injectors, and assumed 5A (2.5A per injector). If you're worried go with 3 or 4 ohm instead of 1.55. 1.55 might be a little low since I was probably over estimating the current. The megamanual won't allow you to enter 5A as the current, but if you enter 1.25 ohms (again, 2.5/2), 4.9A, and 14v, it gives you 1.6 ohms.

We're going to be using 3-ohm resistors on eage8's car for his secondaries.

With 1000cc injectors on the primaries, you're going to need an extra-low opening time. You could also go with Jean's peak-and-hold injector driver board instead of resistors. That would ensure the lowest opening time.

Ken

a_reyes1014

iTrader: (1)

what about if i leave out resistors and use whats on the v3 board and pwm control?

im actually using it without resistors right now and it seems to idle a lot better.

could this be causing me to lose sync?

muythaibxr

If you don't do what I said and run a separate +12v wire specifically for the flyback, then there could definitely be noise issues caused by PWMing the injectors causing you to lose sync. That issue is why I normally recommend using resistors. The high opening time issue is why I usually recommend lower values for the resistors than the megamanual.

With 1000cc injectors, it's going to be hard to get a good enough opening time to idle well. PWM will idle better because it's opening the injector faster, so you have more of the total pulse-width that you can meter the fuel with.

Jean's peak&hold injector driver board installed even inside the megasquirt would have the same benefits of the PWM driver without having to worry about PWM causing noise.

http://www.jbperf.com/p&h_board/index.html

Ken