Yeah, but at $110 for a full tunable computer - it's like a sore dick...




















You can't beat it.

 

Being that the megasquirt has no MAP or MAF sensor, it has no way to calculate load on the engine. In essence this is nothing more than an electronic carburator. Gas mileage on one of these things has to severly suck...

 

enlighten me on one thing, how are you using a TII intermediate housing with pre 86 rotor housings. The inner and outter housing seal grooves are in different places. If you got it to work with pre '86 rotor housings, it would shed some insight in what you were doing. So the engine seals even though the inner and outter housings grooves are mating togther on it? Any other engine builders seeing some discriptency in this "TII center plate" in a GSL-SE engine?

 

I wasn't aware that the grooves were still in the rotor housings on the SE's 6 port motor. I've only built my S4 using the TII housing. This'll be my first 1st gen engine. I was under the impression that the 12A's were the only ones to use that configuration.

 

Nope, 13B, pre-86 use that configuration as well, its what alows the use of 12A end housings with 13B rotors and housings, to make a 4-port 13B NA. At least thats how I understood it.

 

Good catch. Nice to have observant people around.


By the way, he could still just build a complete second gen engine, (with TII intermediate plates and all) and put it in the 1st gen the traditional way, using the the SE Oil pan, front cover, blah, blah, blah...etc..

 

Series 4 2nd-gen AFM's don't send a pulsewidth signal either - they send a variable voltage. That's the way every flapper AFM i've seen does it - it's just an air door connected to a potentiometer, and a fixed voltage is sent into the pot and the position of the air door determines the output voltage.

Note that no RX-7s use MAFs - those are totally different than AFM's.

 

Actually, if you read into the site, it has it's own on board MAP sensor. I have a MS already, I just haven't installed it yet. I want to work out a few bugs with the motor using something that I am familiar with first.

The MS also uses 2 GM thermistor sensors for air and water temp. We have config files written now that allows you to use the stock GSL-SE or 2nd gen sensors.

 

You are correct. I was looking at the FSM's last night. I have found several GSL-SE's with S-AFCs now. It does work.

 

Looking at how the MegaSquirt works, and looking at the GM ECM information, it looks like MegaSquirt is just a more easily programmable GM ECM. By this I mean, from what I see, the programming criteria are the same stuff. (Instead of entering fuel maps, you enter engine size, injector size, and make tables of VE data and discrete target A/F ratios and the ECM does the math)

Hell. I have a small stack of GM ECMs. I can get a EPROM burner and a handful of chips for $110.

 

I was only looking at the wiring diagram for the MS, not the actual litterature. I do now see that they have the onboard MAP sensor.

Seeing as the TII housing won't work without some form of modification to either it or the rotor housing, we'll be using the stock block and I'm sure it'll stay well within the capacity of the stock ECU.

Thanks for all the input.