Sounds awesome, if anyone gets some info about people putting these together that support RX-7s, let me know. I have no fine motor skills so I cant solder worth junk. Otherwise, congrats on getting all this to work... going to be awesome

 

I put my Megasquirt into my stock ECU case. I just ran a DB37 cable to the relay board, though, I didn't try to use the stock wiring harness (I figured that was my problem child anyway). I'll tell you what works out really well for mounting those megasquirt boards into the stock ECU cases: I know both of you guys have assembled computers, you know those motherboard standsoffs? The metal hex ones? you take one of the short ones, and then you find the older style, white plastic "snap in" motherboard holders. Screw the snap in type onto the metal hex ones, and it's at the perfect level to sit the board evenly across, and the snap "tooth" will hold the board straight. I just put 6 of them in (three on each side), and they hold my MS really securely in the case.

Making a Plug-and-play one would be pretty cool, if you could trust your (car's) wiring

Congrats, muythaibxr, you have done us a great service.. I'm definately going to do this, as soon as the season is over.

"Brought my Megasquirted 7 to work today, it's a 55 mile trip one way.. oh yeah, I trust it "

 

Yeh, I drove my MegaSquirted car from Greenbelt, MD, to Blacksburg, VA. 4 1/2 hour trip man

 

The beauty is that I think nothing of jumping in it to drive somewhere, like work.. it's just another day at the office Now if I could only get my warm up enrichments working, life would be a lot happier.

 

tofuball and I are going to switch to using rpm/percentage based accel enrich, and we're going to redo his PWM idle settings (BAC valve stuff)... and we're going to redo his wiring harness (I made a mess testing all this stuff).

Also, tofuball installed a new fuel pump, which actually works, which means his top-end high-load stuff needs retuned, and I've also got to make it so closed loop doesn't come on below a certain TPS value, so that decel works right.

Adding trailing is causing us to need to retune fuel on most of the map (high vacuum/low kPa runs a lot leaner with the settings we have once trailing is working, and the rest of the map needs tweaked).

But even with all that, the engine still runs pretty nice.

 

Ken DID have my engine idling ROCK SOLID. I've never seen another RX-7 ever idle like this one did on MegaSquirt. . .Like you could LOOK at it and not tell it was even on.

Then I went and installed a 9.5lb flywheel. No more rock solid idle :p

 

I've only messed with the idle a little, and not at all since you dropped it to 800. We'll get it back to at least being close to that kind of idle.

 

I can't stand it anymore...I'm moving this to the Megasquirt forum.

 

Aw man, hows anyone gonna know to look in the megasquirt forum without reading this thread? :-p

 

Hi Ken;

Some questions here on your Fidle setup.
Are you using the BAC valve for Fidle? AWS? something else?
How do you have it wired? relay board?

Thanks and Cheers
Cary

 

We're not using a relay board.

We ARE using the BAC valve. The BAC valve is basically controlled with PWM. Changing the duty cycle changes how much air the BAC valve lets through.

You have to get a ZTX688 transistor, and a 510 ohm 1/2 watt resistor and replace the current fidle resistor and transistor on the megasquirt board (R16 and Q5) with them.

Then you just hook up one of the BAC valve terminals to +12v, and the other to the megasquirt, and you're all set. The rest of the setup is done in megatune.

 

damnit, i might just have to get out of this carb business after all

 

Do it, carbs are hard to tune, megasquirt is easy and instant.

Regarding trusting a megasquirted car on a road trip, before I tore mine down to install the supercharger I was commuting 40 miles a day in it with no issues other than warm up enrichments not yet being fully dialed in. It idled damn near stock smoothness at 800 rpm with no BACV and a large street port (stock flywheel though). Startups were very quick, hot or cold.

Megasquirt rules. I cant wait to start driving / tuning my car again.

 

yeah, we have the warmup enrichments for 60 deg and above pretty well tuned. And tofuball says his idle is a lot better than stock... almost no vibration, even with a lightweight flywheel.

As soon as we get his other car up and running again and can stop daily driving his megasquirted car, we'll redo the whole harness, fix up his intake, and then we'll fine-tune everything.

I think we're also going to megasquirt an FB once my other friend gets his 240sx running again... I strongly recommend going with the megasquirt, you just can't beat the price if you're willing to put in the work.

 

I think the MegaSquirt forum could use a FAQ sticky at the top

 

Yup, I'm going to write up an FAQ at one point or another but I can't sticky it

 

Bah, they should make you a mod already, its not like you don't already respond to every thread :p

 

I just added a feature to the msns-extra firmware for idle advance. Instead of using the value in the ignition advance map at idle, you specify a TPS value and an rpm and when your tps is lower than the specified value, and your rpm is lower than the specified value, the specified idle advance is used. This is to get rid of oscillations in rpm due to hitting a spot in the spark advance map between your really low (-5 in my case) idle advance and your really high (20 in my case) next bin over. If/When the creator of msns-extra decides to put it in the official version, I'll post here.

Also, right now 025k is the version I'd say is the "rotary stable" version of msns-extra... I just tested the latest release (025v2) of the msns-extra firmware, and noticed a very small problem with leading igntion. This problem isn't in 025k so anyone who's setting up to use megasquirt for leading and trailing ignition should use 025k for the time being. I think I know what's causing the problem in the latest version, and will debug and fix it probably this weekend. Leading works fine almost all the time, except when you fall below the 700 rpm limit, trailing cuts off (which is fine) but when you go back above 800 and trailing comes back on, there's a small miss in leading. It's not a huge problem, and the engine would run fine even with this problem, but since I'm pretty sure it's an easy fix, I'd just say wait till I've fixed it before trying the latest version.

So short story: Stick with 025k until further notice, and for those who want the idle advance feature I've added, I'll post a version of 025k with that feature.