[Supras] Update on MegaSquirt

[Sean Cavanaugh]

the sensor is easy, using dual VR conditioners you can use the stock CPS 
dual wheel without modifying it. I don't know how the 2jz coils are set up 
but I do know that driving the 7mgte triple coil packs is easy as there are 
2 coil select lines, a coil fire line and a tach line. the only issue that 
has popped up about the MS is the fact that the stock ECU controls 3 fuel 
injector channels and the MS currently only supports 2. I know adding more 
fuel channels is in the future works still. I've come across Coil On Plug 
kits for the 7mgte that maintains the same wiring that the coil packs 
utilize so there's no modification there. Like I said, once my friend gets 
the RX-7 one done he's going to work with me on making a very viable PnP 
module for the MKIII. My module is currently MSnSpark but I think I can get 
a prototype MS2/extra out of him since that's the main version they're 
pushing now with the much better accuracy and extra features like fast idle 
stepper control.

-Sean


----- Original Message -----
From: "Supras Ireland Admin" <admin at supras-ireland.net>
To: "Supras at supras.com" <supras at supras.com>
Sent: Monday, December 04, 2006 2:29 PM
Subject: Re: [Supras] Update on MegaSquirt

> Sean,
> I have been looking at a Direct Coil Drive 6 cylinder MSnS_Extra Setup 
> that is available here in the UK.
> Just wondering if it can drive 2jz coils and what did you use fron 
> cranksensor i.e. optical setup or modified CPS. Im looking at putting it 
> on a 7mgte
> http://www.extraefi.co.uk/products.htm#wasted6
>
> Marty
>
>
> ----- Original Message ----- 
> From: "Sean Cavanaugh" <millenia2000 at hotmail.com>
> To: "Supras at supras.com" <supras at supras.com>
> Sent: Monday, December 04, 2006 6:08 PM
> Subject: [Supras] Update on MegaSquirt
>
>
>> For those of you that seemed to have interest in this previously, I 
>> thought I would have a little update. My MS module is still away being 
>> tuned but there's a big reason its taken so long.
>>
>> The guy I have tuning it is the guy who is writing the software for the 
>> new MS2/extra code. He's refining the code level up to where it should 
>> have been. the original MS2 was written entirely in C and some of the 
>> code wasn't the best it "just worked". My friend is going thru and 
>> redoing everything in assembly which not only speeds up the code greatly, 
>> but he's fixing broken code and raised the code resolution from 1 uSec 
>> down to .01 uSec so as to have events occur EXACTLY when they are 
>> supposed to (1 uSec had issues of minor wobbling in the timing). Other 
>> features that were originally written as not possible are being done. 
>> can track his development in the MS2/extra devel section at 
>> http://www.msextra.com/viewforum.php?f=91.
>>
>> He's also currently working on a PnP MS module for the 2nd gen RX-7 (FC 
>> S4 soon to add S5) and I am talking to him about helping develop a PnP 
>> for the MKIII Supra also using mine as the setup car since he just moved 
>> up a few miles from where i live. It would be for the N/A guys first and 
>> turbo later as i switch parts over for it. The only real difference 
>> between the 2 is the coil ignition setup (2 wires for N/A vs. 4 for 
>> turbo) as the AFM is replaced with a MAP sensor on the MS module. It's 
>> also nice how the MS2(/extra) can even handle the fast idle stepper 
>> motor.
>>
>>
>> I still need to finish my write-up of what parts are needed to swap the 
>> interior bulbs over to entirely LEDs as I have already done on my car 
>> (dome lights were only ones i had to do any work to replace). I will do 
>> one for the exterior bulbs too when i get the funds to get them
>>
>>
>> -Sean
>> '87 N/A Supra to be turbo EVENTUALLY
>> '90 RX-7 N/A convertible 200HP "the original MegaSquirted rotary"
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