nu-rx7junkie

iTrader: (1)

OK well put it in so im going connect to my laptop later and see if everything works. Thanks

nu-rx7junkie

iTrader: (1)

Anyone have a base map for a hbp, turbo, 1680cc 550cc injectors, dual vr conditioners, and need a map to start with. If no maps avaliable guess im going to ask tons of newb questions for trying to confugure, calibrate, and settings. Thanks Let me know if yall need more info.

nu-rx7junkie

iTrader: (1)

Ok I got couple more things to ask about.
1. I had the stim running the squirt and was playing on my laptop to try to learn my way around megatune and see what settings I need to find out. Well I turned the IAT pot and turned it back and fourth to see the effect and some smoke came from it?Burned Smells burned , doesnt look burned and If i remember correctly it still worked? I just have a v2stim. Do I need to swap out that pot with a different higher ohm one?
2.The 2nd vr condtioner. The diagram in this thread shows a 56k resistor and an 82k. I have my board for the curcuit (i bought from the link posted a little back)b. It is for a dual vr but i was going to build the one side i need instead of in the proto area. The 82k resistor in the diagram. Should it be 82k? Or Is that one that needs to be changed? My little kit only has a 1meg ohm left. I think it is. I have some
100k ohm one laying around wll that work? Well i traced all the other parts and values to their locatons but this one got me.OK,
next item in the FAQ:



KEEP IN MIND that the 56K resistor above should be replaced with a 39K resistor, and the .001 capacitor should be exchanged for a .01 capacitor for the rx7. Also keep in mind that the left part of the circuit isn't needed at all for a v3 board, as the v3 board has a built-in VR signal conditioner that you can use.

. And yes i swapped out the .001cap for a .01 cap. JUst a little stumped right now. So what about the 56k? and the 82k? Im pretty sure my ciucuit wll only use one of those.


3. Anyone have a base map ? If not anyone care to help walk me through and clarify settings I need to make?lol so many choices .
Any yes I keep reading faqs and reading the megamanual but rotary is not a clear subject and this level of tuning is new to me and so is some of the language. But time is on my side. Ill learn.

Aaron Cake

iTrader: (1)

Smoke is almost universally bad. If I had to guess, based on the schematic, you put in WAY too low a value for R4. This the pot was sinking way too much current. You can turn all the pots on the Stim to their limits and not worry.

You cannot substitute a 1Meg resistor with a 100K resistor.

For the two tooth circuit, I have always used 82K.

Here is a link to a thread with some MSQs which will help get you started:
https://www.rx7club.com/forum/showthread.php?t=678869

nu-rx7junkie

iTrader: (1)

Ok well got to looking at the ms2 faq and noticed the 2nd vr circuit is different from ms1. So I have ms2 and ordered the jb perf vr board and it looks more like the ms1 vr circuit schematic. So guess it is junk now? Or Guess I can desolder the resistors and look at the schematic for the ms2 and jumper resistor locations that i dont need. Or try to build it in the cramped proto area.

And I see vrout goes to js10. And then to the cas? -g?
And i guess just jumper the 5v and ground to the proto area?
And what goes to vr in? g+? and in through what pin on the db?
I got some microphone cable to run the vr wires. Do I run 4 wires for both vr circuits? or Just 2 for the 2nd vr trigger?
And what is the best way to connect the jb perf board to the squirt?

Or see how well modified cas works. Any one have any good sucess with it?
Is the modified cas accurate to 8.5-9.5 k rpms?
Thanks in advance.
Sorry for more questions

pmrobert

The 12-1 works fine at high revs. It is theoretically a bit less accurate and more noise prone though my 12-1 use was drama free. It just worked. Some people are a little antsy about chopping up a perfectly good CAS, I wasn't due to having several. It can be a little tricky cleanly deleting 2 teeth as that is very soft steel and a slip of the Dremel will gouge surrounding teeth leading to an imperfect waveform from those gouged teeth. Also, you need patience and the correct sized drift to get the roll pin/drive gear off so you can get the whole shaft out of the housing. The teeth delete operation should not, in my opinion, be done with the CAS assembled. I now use the jbperf unit with the RC circuits disabled (pin 14 of the chip grounded). This means that at negative zero-crossing, the output toggles on and stays there until positive zero-crossing thus rearming the trigger circuit.

Aaron Cake

iTrader: (1)

I don't know anything about that board, but if it is based on the standard LM1815 setup, then it will probably work fine.

I've always just built them in the proto area. There's plenty of space.

It depends on the firmware. 1.x firmware needs VROUT connected to JP4, 2.x requires JS10.

VROUT (technically VR2OUT on the LM1815 schematic) connects the VR signal to the CPU. It does not go back to the CAS. This is fairly clear on the schematic. Note that the instructions for MS1 are almost the same as MSII, the exception being where VR2OUT gets connected.

That would be easiest.

The stock VR conditioner on the MS board is used for the 24 tooth wheel, NE. The LM1815 circuit is used for the 2 tooth wheel, G.

I suggest running both VR signals inside your shielded microphone cord.

The easiest is to install a header on the prototype area, and then use a plug on the JB board.

nu-rx7junkie

iTrader: (1)

Ok I figured out the jb perf board and just ordered shielded wires from RSautosport.
And I found this Pdf in a thread I found.http://stuff.pw.cx/Megasquirt%20MS2%...azda%20CAS.pdf
I found this document very helpful for myself. I saw the msII faq and noticed that this document was not in it. I make a motion to move it to the faq, after muythaibxr and other ms pros check over it. And when will settings for ms2/extra be avaliable?
Ill be back to ask more questions later.
Thanks

Aaron Cake

iTrader: (1)

Yes, that should be in the FAQ. The FAQ is a bit out of date at this time and I've wanted to fix it for a while, but first I need to update my own site...

nu-rx7junkie

iTrader: (1)

Anyone with a map to start a 13bt, 550, 1680, ms2v3.0/extra 2.0.1? dual vr circuits, gm iat and stock clt sensor. If you need anymore info let me know.Thanks in advance

TwistedRotors

iTrader: (3)

Thank you for posting that link but it was broken for me (Firefox on Ubuntu). So I Googled the part that I could see and was able to find it. Here's the link again just in case someone else has the same problem I did.
http://stuff.pw.cx/Megasquirt%20MS2%20V3%20Mazda%20CAS.pdf
-John

nu-rx7junkie

iTrader: (1)

Ok now ny coolant temp reading is erratic whether on the stim or on the car? Im using gm iat sensor and stock mazda temp sensor. The readings go from like 185 and start shooting up to like 300 or so. and then repeats. So sounds like ecu problem to me. What would i look for to fix it? open circuit? or what? Thanks

muythaibxr

With the MS2, you'll want to remove the cap and resistor connected to pin 14, and then ground pin 14. You should be able to do that on the jbperf board.


Ken

muythaibxr

The ms2 section should not be out of date at this point. I updated it pretty recently.

Ken

Aaron Cake

iTrader: (1)

Cool. I'm in the middle of making the mother of all Megasquirt RX-7 write ups at the moment. I may pick your brain slightly on a few details of the MSII since I don't have a lot of MSII seat time.

muythaibxr

Cool, glad to see that you're doing a write-up. I'm swamped with work, and ms2/3 coding.

Ken

nu-rx7junkie

iTrader: (1)

So, the jb perf board I only need to delete the cap and resistor on pin 14 and ground it? Do I need to swap the 51k resistor for a 82k? And on the perf board anyone know if the ground pins are all connected on the board? Just trying to double check this part cause i have no rpm signal using the dual vr. I have jimstim on the way asap so I can try more testing.