I finally got the time to mod an MS to use with ms2/extra.

It runs pretty nice, smoother than ms1/extra.

I'm running the full stock igniton, with an unmodded CAS, and stock leading + trailing.

The mods to use it are basically the same as ms1/extra, except for the second trigger input to the ms2 chip.

The only issue I had was with noise on my 2nd trigger input... so after studying what other manufacturers do on their VR conditioner inputs, I put a .1 capacitor from G+ to ground on the input to my lm1815 circuit, and that cleared the problem right up.

We'll be driving one of the rx7's down to the megasquirt meet near Richmond VA this coming weekend, and tuning the ms2/extra while we're there.

Anyway, that's it for the update, just wanted to let people know that ms2/extra runs the rotary with no problems!

Ken

 

is the code as stable as the current code for ms1/extra? Also are there going to be any plans to sell a PnP MS2 unit in the future?

 

It's more stable in some ways, less in others... configuration is a LOT different..

We may eventually sell an ms2/extra-based product; but we need to get production sorted out so we can keep up with demand first.

Ken

 

That's awesome. Good job! My 12A is humming right along w/ the MS2/Extra 1.0 beta code. Image of window sticker for new toy attached.... Finally got rid of the 04 automatic. Huge difference!

 

Great news Ken. You sure do a lot for us.
Does MS2 use the same inc files for MAP and temp sensors as MS1?

Thanks,
Marty

 

MS2 doesn't use inc files at all... you enter the calibrations in megatune (every time you reflash the firmware).

 

Is there any chance you would post up the specifics of your set up? I have a MS2 that I want to put in my FC.

 

Basically, I'm using one of my MS->FC adapter boards that I designed originally for ms1/extra.

The only difference between what's in the FAQ for required modifications, and what I did here are 1) the capacitor that I added to the lm1815 circuit, and 2) the output of the lm1815 circuit goes to "JP4" on the ms2.

Other than that, it's exactly the same as the FAQ, including the use of pullups, which LED does what, etc...

If there is anything left out, or anything in the FAQ or here that you don't understand, ask that specific question, and I'll do my best to answer it.

Ken

 

Sweet! Thanks!

 

excellent news Ken! ... quick question tho for the lm1815 part ... this .1 capacitor ... anything special or just any will do? ... did you go to board ground or external?

 

I just basically connected the G+ and G- wires where they attach to my daughtercard..


I used a .1 uF ceremic cap that I had lying around. I don't think it will matter that much as long as it's .1uF, and ceremic.

Ken

 

Hi Ken,

If you don't mind too much please take a look at the procedure I compiled from the FAQ thread, this thread, and other sources. As I was trying to understand exactly what I have to do I found that I had several specific questions. The compilation can be found in the following thread... Thanks!!!

https://www.rx7club.com/showthread.p...94#post6872094

 

congrats muy. I will be hopefully be trying this towards the end of the year. Between autox and bills, I am strapped for cash pretty well now a days.

dpf22

 

On a sort of related question... We have been considering converting my wife's S5 over to MS and will be doing just what you did more or less. Trying to keep as much as stock and improving where required. About how long did it take to do the conversion excluding tune time?

 

I didn't do a "conversion" really...

I have an S4->MS adapter board that I designed. I just used that, plugged it into my car, hooked up the MAP sensor, and fired it up. That's all there was to it.

Ken

 

So while I would be building Acidshocks computer I could just make a board that takes the MS pinouts and runs them to the stock ECM wiring using a scrap ECU for the connector...?

 

You could. Or you could build a harness... Often the stock harnesses are in pretty bad shape on these cars.

 

just reading this. that's great news Ken.
i watched your presentation also, looks like some interesting things developed for MS2.

i have an unassembled MS1 V3.0 kit. is there any way to get just the MS2 chip without having to get the whole MS2 kit? what else would i need if i could do that?

 

most of the sites that sell the MS kits sell just the MS2 chip.

 

Ken,

Couple of questions:

1) What are the perceived and then (now that you actually have it running) actual benefits that you've experienced using MS2Extra vs MS1Extra?

2) When you say "configuration is a LOT different" - what exactly do you mean? I've been poking around the MegaTune interface with MS2 extra and haven't seen anything that looks too drastically different!

As you may remember I'm about to go from a fuel-only setup to a fully ignition-controlled setup on my V3 board. I'm now debating using MS2Extra but would love it if you could answer the above questions!

Thanks in advance

 

The main thing you'll notice is that the engine runs a lot more smoothly. This is due to a large number of reasons, which make it possible to actually control the pulse-width down to the microsecond, and due to the fact that the every-tooth wheel decoder uses every tooth to set dwell and timing... which leads to a much more stable spark output.

I mean that the wheel decoder settings are completely different... all you have to set is the number of teeth... 2nd trigger, missing, or both, and then angle of the first tooth after the extra or missing tooth. No more setting triggers or returns, etc...

Also, there are a lot of new options for setting what to use as load, dual load... load is settable for spark independently from fuel, EAE is now incorporated, etc...

Ken

 

Thanks alot Ken. Any chance you could do a mini-FAQ for MS2 software settings?

 

Some documentation has been started, which will include rotary-specific settings. I'll post here when it's further along.

 

Where can we download the MS2/Extra firmware?

 

I found the firmware at msextra.com. Thanks for the work you put in to this Ken.