MS2 upgraded from MS1 no RPM 4+1 CAS - Miata Turbo Forum - Turbo Kitten is watching you test compression.

MD323 · **MS2 upgraded from MS1 no RPM 4+1 CAS**

I have a friends MS1 here that I upgraded to MS2 and did all the mods on the wiki.
http://www.boostedmiata.com/gallery2..._0003_mods.jpg

its using this style 4+1 CAS from a FWD BP05:

im using a PnP style standalone jumper harness that ive ~~double~~ triple checked.

the ignition setting are set to CAS 4+1, falling edge, d14 is spark, 2nd trigger on JS10

ISSUE
i get a 200RPM spike once in awhile from it but otherwise no RPM,

multimeter shows a fluctuation from 0 to 11v during cranking

diagnostics in TS is greyed out, I have no clue why.

I dont know the needed trigger angle but 50 deg should be close to correct.

any ideas?

**Reverant** · 07-17-2011, 04:19 PM

Quote:
	Originally Posted by MD323 diagnostics in TS is greyed out, I have no clue why. any ideas?

Update TunerStudio. Then diagnostics will be available again, and you will know what it s wrong.

MD323 · 07-17-2011, 04:23 PM

guess i need to stop slacking and fix my wifi card then..

im going to guess from your statement you think its sync error? none showed up in the log but I know that doesnt really mean much

MD323 · 06:12 PM

ok so both triggers are eratic at best. im uploading a log now but this laptop is slow as hell.

suggestions?

MD323 · 07-17-2011, 06:43 PM

so thinking noise might be an issue on the harness. I used some 2 pair 16ga foil shielded wire and bypassed the stock harness for the crank and cam signals and no change.

even seen reverant's posts about a 2nd opto circiut being needed on his builds, think this is the issue?

MD323 · 07-17-2011, 08:50 PM

im leaning towards installing a 2nd 4n25 on the board but this still leaving the noisy signal on the primary input..

any suggestions for that?

2nd 4n25 from the mse manual will be added like so:

and since im sure someone else will need it, here is the datasheet for the 4n25 with the pin number in it:
http://www.vishay.com/docs/83725/4n25.pdf

MD323 · 07-17-2011, 11:35 PM

ok so with the 2nd opto installed i still get no RPM.

here is the MSQ and the composite log:

MD323 · 07-18-2011, 10:40 AM

74 views and no input?

am I missing something that n00bish that no one wants to point it out

**Reverant** · 07-18-2011, 10:44 AM

There is no cam signal at all from what I see. Double check your wiring, circuits, etc. A scope would help here.

MD323 · 07-18-2011, 11:14 AM

Quote:
	Originally Posted by Reverant There is no cam signal at all from what I see. Double check your wiring, circuits, etc. A scope would help here.

on the new log? or both?

TS's logger confuses me.. i assume the "flags" represent it seeing the signal change state?

this is the 3rd time ive needed a scope in the past 6 months, guess its time to just buy one

**Reverant** · 07-18-2011, 11:18 AM

The blue trace is the crank signal; there should have been a green trace as well, which would have been the cam signal. It is missing, so the red trace on the bottom suggests that there errors (specifically, there crank pulses but there were no cam pulses).

MD323 · 07-18-2011, 11:23 AM

heh, I was too tired last night to notice that on the new log. ill go double check everything seeing as I atleast had an erratic cam signal prior to the 2nd opto

MD323 · 07-18-2011, 12:27 PM

ha, so my jumper harness was the cause of no cam signal after the opto install... these things do not like to be uninstalled/reinstall 60 times a month

I have 257 cranking rpm's now

anyone have one of the newer style CAS's and can tell me the angle between main and return?

if not i guess ill have to do it the hard way

FatKao · 07-18-2011, 02:46 PM

Shouldn't you be using the 4g63 decoder with a BP CAS?

MD323 · 07-18-2011, 03:49 PM

Quote:
	Originally Posted by FatKao Shouldn't you be using the 4g63 decoder with a BP CAS?

this is for a FWD BP which has a single coil and a distributor as well as our CAS only has one tooth on the 2nd wheel as apposed to two like the 4G63.

otherwise they are identical to the (im guessing at the exact years here) 96 97 miata and later model DSM CAS's

the car is running decently now lets hope it the does the same on his later this week