Megasquirt FAQ, writeup (Updated 30/10/09)

Talk EMS and Computer related performance

Postby pit_celica » Wed Feb 04, 2009 11:10 am

here is my AFR map. These AFR map are something universal :

Image

For the fuel map, use the VE table generator in the fuel map option. This will genrerate a base map dependign of your injector size, hp and torque number. This table will be too rich for sure, but this will be a nice starting point.
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1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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Postby tw2 » Wed Feb 04, 2009 9:13 pm

Thanks for the target table. I have read up a little more. The VE table has the "injector values" for MS to use, the AFR tables has the target values which never change and the ignition table is all about guessing.

Would you be willing to post your ignition table at all? It would be nice to start off with if you don't mind. I know it isn't fully tuned but it would be easier than starting from scratch for most of us.

Do you pretend that you have high impedence injectors when configuring MS? since we have injector resistors already built in for our low impedence?

Some of those fuel and cranking settings seem pretty complicated :|
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Postby pit_celica » Wed Feb 04, 2009 10:19 pm

Ok, here is my ignition table :

Image

Please, do not comment about the 10 and 0 values on the upper right part of the table. This is just for security. Anyway, I will never go past 6500 RPM and 12-13 psi until I have a kind of "knock listeners". I will try the "det cans" trick this summer (google it).

For my part, the stock ST215 injectors are top-feed, high impedance 540cc. For low impedance injectors, read about it in the Meagamanual, it's covered.
1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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Postby tw2 » Wed Feb 04, 2009 10:46 pm

Some of those 0 cells you could not possibly get to with a t3/t4 anyway. Thanks for that. There are some excellent instructions on det headphones on mr2oc and also some diy instructions on autospeed using a jaycar micrphone amplifier designed for deaf people. I can find both of them if you need me to. They should allow you to street tune your ignition with someone else in the car.
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Postby pit_celica » Thu Feb 05, 2009 2:38 am

this could be very nice if you could try to get theses. Let know when you get some news!

Sam
1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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Postby tw2 » Thu Feb 05, 2009 3:05 am

http://www.mr2oc.com/showthread.php?t=242341 This is to the autospeed article via a link in the 1st post. I found this by accident just then on mr2oc.

Sorry I cannot find the other one from mr2oc, I cannot remember how I found it. It is basically some earmuffs with brass fittings drilled and taped into them, vac hoses going to a brass fitting which is bolted to the block. It looked pretty good and is very very cheap.
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my ignition map

Postby Quark » Fri Feb 06, 2009 9:14 am

Hi guys.. I did something smart.. Or I think so :-D

I toke the ignition map from the AEM Alltrac EMS setup and made a ms sparkmap out of it...

Look here, I think that you dont find a better starting point then this.
Image
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Postby Quark » Fri Feb 06, 2009 9:18 am

It is much more agressive than the other one that is posted here, but I think this is much closer to the original.
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Postby pit_celica » Fri Feb 06, 2009 10:51 am

Watch out! All of the AEM users remove 3-4 degrees across the whole map before starting with the AEM base map. Please do the same. You would prefer to be in the safe side!

Ask some AEM users over MR2OC, they will told you that the AEM base map is too agressive.
1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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Postby Quark » Fri Feb 06, 2009 7:50 pm

3-4 degress is not enough to be a problem. Only at max load it can be a problem.. Never heard of it, maybe it true, dont know.. Will look into it on mr2oc.com
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Postby Quark » Sat Feb 07, 2009 5:32 pm

Got my MS2Extra up and running now, had a problem with one of the Vb921, but now its running. Still needs a tuning.... :-D

All this done without cutting any wires... :-D
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Postby pit_celica » Sat Feb 07, 2009 6:14 pm

really nice, keep us updated with this! Post some pics of the installation and get it tuned!

Sam
1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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Postby Quark » Sat Feb 14, 2009 6:55 pm

Finally I got it running like its suposed to. A small problem with resistor from daugther board to vb/bip. Now its running strong.

Pit_celica> Do you have a problem keeping the idle down? Mine will idle at 1200-1250 with idlescrew shut and Pwm valve off.
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Postby pit_celica » Sat Feb 14, 2009 7:19 pm

The problem with our IAC valve is that it is normally open. So, even if you have set your PWM at off, the idle valve is open. I suggest you to plug the vaccum line of your IAC. This way, no air will enter by the IAC valve and your idle RPM will be set by the idle screw on the throttle body.

Further, when the engine will be nicely tuned, you will need to tune your PWM valve. You will remove the plug in your IAC vaccuum line, you will set your PWM to 100% (fully closed) at normal coolant temp. You will make a table (PWM idle % talbe) that ramp from 100% at normal operational coolant temp (180°F in my case) to 0% at -40°F.

This way, the valve will be wide open at -40°F and completely closed when the engine reach his operational temp.

As I said earlier, would you post your tuned .msq file, I wanna see it!

Good luck for your future tuning!

Sam
1991 Toyota Celica GT-S ST184 with 3SGTE gen4 ST215 swap, Megasquirt 3 + MS3X, t3/t4 turbo, 3" full exhaust, front mount intercooler and more for fun !!!!!
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Postby Quark » Sun Feb 15, 2009 7:19 am

I will upload it a little later..

Ms2 extra have the function of inverting the PWM valve, so that not a problem, the problem is, that when its at 0% pw, it still lets air in. It operates fine at low temp.
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