I have the surface mount board i bought complete from DIY, it is as the title says PCB3.57M SMD
I can't find any diagrams or any information of any kind for this board. Is it pretty much the same as the 3.0? No proto area?
Does anyone know where i might be able to find a good diagram of the board or any point in the right direction would be helpful. I am trying to run this on a 2 rotor Cosmo Engine. Same Ignition and CAS as the TII. I am just trying to figure out what exatly i need to do to this board to get myself going and i am having trouble figuring this out when only kind of diagrams or instruction, well any information i can find in general is about the v3 or under.

Any kind of help is greatly appreciated
Thank you

 

I'm not sure but I dont think anyone here has any experaince with that board. I know all the 3.57m stands for is a preassembled board but as far as modding it to work with a rotary I would contact who ever you purchased it from for more information.

I'm not going to say you cant mod it but it may be a bit more diffrent than the regular V3 board. I look at it this way, no matter what you must solder something on or off the board so why not build it from step 1, this way if or when something goes wrong you have an exact idea where to start looking for the problem.

If you have something you cant fix yourself you are probably better off with a microtech. Dont be intimidated with the electronics, I would return that kit and buy the regular ms1 V3 pcb and start from scratch, there is an overwelming aray of help here for help and support to get it running.

Best of luck, Russ!

 

Well, In theory it should be easier to configure since i dont have to solder anything or well not as much it seems like it is pretty much the same for the most part i did message the company i bought it from and i am waiting to see if they can send me a diagram of the board. If i can get that i will get it going next weekend and hopefully start the car. I wanted to try out all the new ms2 features as well and use one of these newer nicer boards i will get it figured out one way or anyother. The ms1 or the other ms2 would be no prob. The surface mounted board i have is just a little more different than i thought it would be but if i can get this one going ill probably start using them on everything. I'm praying for a diagram from DIY, I'm sure they will probably be able to get me one.

 

Two things for starters you need to find out about is what resistor you need to change for the coolent sensor to make it work with the rx-7, and unless you are going to cut teeth out of your cas you need to add the second VR circuit to work with stock trailing. They both involv a bit of soldering. I'm 100% sure you can add both changes to your board but you need to learn where to tap into and how to tap into this board for everything to work correct. And for other mods like electric fan, boost controller, boro correction, etc..etc..etc.. you need tl learn how to add that stuff. The V3 pcb has areas to connect that stuff and it's well marked.

 

I've just received an SMT board, so I'll have a look at it and post what mods are necessary when I've had time.

Ken

 

Thanks for posting that pic that will help

 

I found the schematics i was looking for. I'm sure a lot of you know about this site but i didn't and DIYautotune told me.
http://www.megamanual.com/357/hardware.htm

 

Thanks for taking interest Ken. I'll greatly appreciate that

 

I'm glad you found that diagram.

 

Based on the megamanual it looks like the SMD version 3.57 has a second vr circuit already setup on the board. It may make the extra board unnecessary?

 

Nope, the 3.57 board does *not* have a second VR set up on the board.

Ken

 

any updates on this?

 

I can take some pics, but basically modding this board is very easy, as it already has the pullups built in, has a transistor that's got a high enough current limit to run the BAC, and is prebuilt. You will have to build a second trigger conditioner on a separate board, and connect it to the 3.57 board, but the pins to connect it to are the same as the regular v3 board. I'll take a look tonight and make sure there's nothing else different.

Ken

 

do the 3 wires still need to be soldered on? What about all the Vrin --> tachselect and the TSEL --> vroutinv. But yeah, I'd love to see some pics when you post em up! I really like the new board alot, but I wanted to steer clear of it until someone became familiar with how it can be modified for the rotary, etc.

 

all the wires for vrin->tachselct etc.. are done with jumpers now... You'll still need to solder wires for the ignition outputs out to the spare pins though.

Ken

 

What about baro correction? is the board populated with a second MAP input for this?

 

No, it's not, you'll still have to get another sensor and mount it somehow.

Ken

 

Any more updates?
I basically convinced my brother sell his microtech ltx8s w/ coils and hand controller to get a megasquirt because I will be doing all the tuning on his rx7. I personally don't like the microtech anymore. I definitely want him to get the 3.57 board, but I want to make sure that I won't be running into a "dead end" or getting stumped trying to get it to work like my 3.0 board. (Ex.: building or setting up the 2nd VR circuit, etc.) I must admit, I will need sort of a walkthrough on the 3.57 board. Or should I just go with the MS-II 3.0?

 

Figured I'd ask 1 more time before I buy the 3.0 this week. I guess it doesn't help not being electronically "savvy" (unfortunately, I hardly have anymore time on my hands to sit down and study schematics and figure it all out)

 

Like this?
http://www.jbperf.com/dual_VR/index.html
When using the 3.57 board with the MS2 processor, is there room inside the case to mount it anywhere like on the top side, or would it have to be mounted externally somehow.

 

That board should work, although you might have to change a couple of components in the BOM depending.

It should fit inside the case. Just make the wires long enough so you can mount the board away from the MS2 daughtercard itself.

Ken

 

Unfortunately I'm giving up on going with the 3.57 board, and I'm going to stick with the 3.0 board and build a 2nd vr in the proto area and use the MSII processor. There just doesn't seem to be enough info on the 3.57 board for me to justify buying it and stumbling through it when I'm in a situation where I'm pressed for time.