rmh3093

I just wanted to double check since I couldn't find it posted anywhere. Does the crank trigger disk have 180 teeth?

nismology

iTrader: (8)

I can see where this is headed. You're not planning on starting a brand new thread for every question you have concerning your future MS setup, are you?

hightuner

iTrader: (1)

*******************




, i will try to find info on the fsm,

rmh3093

is that a 3.0 flywheel or 3.5 cause i think they are different and I need the specs of the 3.0....

from http://forums.maxima.org/showpost.ph...67&postcount=1



i count 180 on this pic which is supposed to be for a 3.0

rmh3093

i only have 1 more 2 more questions that I havent asked, and the info isnt necessarily related or helpful for only MS installs, its good info about the VQ motors that isnt posted anywhere yet

hightuner

iTrader: (1)

Man lol , i never count it , i just took someone word .

it looks like your right
its 180
I confirm this is my 3.0 96 resurfaced.

from what i read , this is too much for the ms, i wonder how much is the other one.

rmh3093

i think i can use a hardware divider circuit (couple bucks) 180/4 = 45 which would bring i think is ok with the MS

EDIT: acutally i think an even number is needed so 360/5/2=36 and 360/6/2=30

nismology

iTrader: (8)

Cool. Just wanted to make sure we were on the same page.



But to answer your question, yes it is 180 teeth. 180 teeth and 180 spaces to make up the 360° signal.

Apparition

iTrader: (5)

What would we do without you..

rmh3093

Alright so if the crank trigger wheel has 180 teeth... now with regards to the crank sensors... does reference signal fire a pulse once per revolution when cyl1 is at TDC? and does the position signal fire 180 pulses per revolution or 360 pulses per revolution?

DandyMax

iTrader: (7)

IIRC the REF sensor is 2 teeth at TDC, and one at 120 degrees and at 240 degrees (all relative to #1 TDC). The POS sensor is a square wave, corresponding to gaps and teeth on the ring, and used only to establish rpm, it's blind to piston position. See below...


From my first EU thread back in the day... all the crank and cam signals scoped...

rmh3093

ahh i knew i saw this a long time ago when i first read your thread... thanks for the links

hightuner

iTrader: (1)

thanks DandyMax

It looks like its very near to what GM DIS Ignition

exept it work whit 60 instead or 120 , dont know if theres is a way to mod it or somthing

hightuner

iTrader: (1)

It looks like i read too fast ... once again

what dandy descibe is the opposite as GM

is this what you mean dandy ??

rmh3093

this also seems similar to the buick C3I: http://megasquirt.sourceforge.net/extra/setup-c3i.html

rmh3093

one of the programmers on the ms2/e forum can probably write support for the crank ref + cam signals if we can draw out a timing map like the other ignition systems have...

are there any pictures of that crank ref plate? and what generates the signal for the cam sensor?

here is another photo from the FSM that migh help us out:

hightuner

iTrader: (1)

sup guys , can anyone confirm that Vq35 cams have the same groove as the VQ30 ???

eng92

iTrader: (3)

They are not even close. VQ30 cam sensor is on the timing cover and picks up off the sprocket. The VQ35 sensors are on the rear end of the valve covers and pick up off that trigger that you have pictured above.

Dan posted the VQ30 cam waveform above.

The VQ35 crank and cam waveforms are given here:
http://forums.maxima.org/showpost.ph...53&postcount=3

hightuner

iTrader: (1)

Thanks Eng92 ... appreciated

is this the reason why ppl need to put a cam adaptor (vq35 swap A32 ecu) ?

thanks

rmh3093

hightuner, i found this interesting... seems like our cars run in batch fire mode on startup then switch to sequention once its up and running

hightuner

iTrader: (1)

interesting , and odd.

rmh3093

DandyMax, do you by any chance have a scope of the cam vs. crank pos and the crank rev vs. crank pos? or if you still have access to that scope could you get these signals for me please?

EDIT: Are all those scopes with the engine running at the same RPM?

rmh3093

this is my best first attempt to turn the time based scope images into a degree based timing map.... can people look over this and see if it is accurate, thanks!

rmh3093

Does this look right to anyone that has scene the crank ref signal plate?

rmh3093

can no one really confirm or reject any of this?

.... this is all thats keeping the megasquirt devs from writing code for our stock sensors!

DandyMax

iTrader: (7)

I haven't had time to check any of this, sorry. You don't have a cam sprocket/REF ring to compare? IIRC the scopes I posted above were done at idle and 2000 rpm.

Are they writing the program based on those 2 signals?

I'll try and look over your timing diagrams later tonight if I get a chance.

rmh3093

no i dont have cam sprocket or crank ref ring to compare too...

they said if I could draw a timing diagram with the crank ref and cam signal (in degrees) then they could write the code... but the i has to be relative to degree and the scopes are in milliseconds

if I could get a scope of the crank ref vs crank pos and cam vs crank pos then there should be no issue in converting that to degrees

thanks for your help!

eng92

iTrader: (3)

The signals are periodic. You can calculate the degrees of separation directly from the scope outputs

rmh3093

thats how I generated the ingition map 2 posts above, but its an estimate... not exact, thats why i want confirmation

... from the looks of the cam+crank ref 2 scope, it seems like there are exactly 150ms between each crank trigger and each grid is about 10ms apart so that would mean 120/180 = .8 degrees per 1ms or 8 degrees per 10ms

it also appears from those graphs that on the crank ref plate the second tooth at TDC starts 10 degrees after the first one.... that what i have been able to come up with