.::evil inside::.

Hey there guys, I'm just bench testing my megasquirt v3 running ms2 extra 1.0.0.2 firmware with stock cas and dual variable reluctor setup. I'm using standard fc leading and trailing coils, my leading is functioning fine and my trailing is firing fine except its not toggling between the coils. Its only firing on 1 coil, the toggle function doesnt appear to be working. I've checked that my module is functional still by applying +5v to the white toggle wire on the coilpack and it switches to the other coil.

So the module is functional and both coils are functional, it obviously isnt getting the toggle signal from the megasquirt. I've tried messing with different settings and can't seem to have any success. This is a pic of the settings I am running in megatune.



if anybody could make any suggestions that would be fantastic!

muythaibxr

Your tooth #1 angle is wrong if the CAS was stabbed as stock, but that wouldn't cause the problem you're seeing.

How did you wire your trailing? Does the middle LED blink at low revs?

I've actually only ever used 1.0.2 with ms2/extra on my own rotary setups, and it has worked fine, trailing fired exactly how it should, etc... so the only thing I can think of is wiring.

Ken

H4Inf

what should tooth #1 angle be for a stock CAS ?

muythaibxr

On ms2/extra, with the stock CAS stab position, you've got tooth 11 at 65 deg BTDC. So 12 is at 35, and tooth 1 is at 5 deg BTDC.

Ken

.::evil inside::.

Thanks for your help Ken, I really appreciate it mate.

I've successfully got the car running! hooray, except I have a bad glitch at around 2000rpm. When I get to around 2000rpm the rpm signal goes absolutely mental and jumps all over the place and in turn so does the ignition so there is a massive stutter around 2krpm. Once I get past 2krpm it keeps revving out fine with no issues. I havent driven the car yet so I don't know what its like under load, but it obviously wont be any good with a stuffed signal like that. I've tried putting the 0.1uf cap from G+ cas wire to ground as close to the lm1815 as possible with no luck. If anyone has any idea whats going on please share your ideas with meee!

thanks

muythaibxr

Could you get a datalog of that behavior so we can see what's happening when you're having that problem?

Also, how do you have tach input wired internally?

Also, did you remember to turn off fixed-timing so you actually get advance?

Ken

.::evil inside::.

Hi Ken, here is an image from my datalog showing the spikes


I have the tsel wired to vroutinv and tachselect to vrin.

I did run on and off fixed timing (it obviously wouldnt want to rev out on fixed timing hehe) but it revved out just fine on the ignition map... It's just the nasty hiccup in what seems to be the rpm input...

something paul mentioned was that I dont have my air temp or coolant temp sensors connected and I'm going to put resistors where they should be just for testing purposes. Could that be a possible cause of my problems?
I shall be testing all this stuff tomorrow morning so I'll post back to let you know how I went.

H4Inf

Just a note- the spikes were to around 3000rpm or 4250rpm. This may have some sort of mathematical significance.

muythaibxr

Alright, if you've wired to vroutinv, you need to change ignition input capture to "falling edge." That could easily be the problem.

Ken

.::evil inside::.

Thankyou Ken! I wired up my sensor wires to resistors and changed my ignition input capture to falling edge and it now has no glitch and runs suh-weet. I'm a very happy camper right now and there's no way I could have done it without the help of all the guys here at rx7club, namely Ken, paul (H4Inf), Quasar, and many others. Thanks guys... now I just need to set up fuel injection

muythaibxr

Make sure that after switching the input capture edge, you reset your timing by turning the CAS. The timing will be off significantly if you previously set it while capturing on the wrong edge.

Ken