Megasquirt 2 build in 3 1/2 minutes

[Biggy72]

http://www.youtube.com/watch?v=CLW42W0YSZA

Like the kegerator in the back ground?

[Grant Mahler]

How are you doing timing/ignition events?

[Biggy72]

This was our second one being built. It's going to be batch fire, but on our first one it will be sequential. This way we have one that we know will work (batch) and one that we can experiment with(sequential).

I'm not really the expert at all of it, but we have two guys that are really good with MS and one guy that's pretty good. I'm hoping to learn about it though so I can use them once I'm done with school.

[Grant Mahler]

Since you are using a 4 cyl, what code/trigger wheel are you using? I was unaware of any that was stable to 16000 RPM, and would like to know what it is (if you are willing to share).

[Biggy72]

I don't know the specifics, but I was told not to worry about it too much. We had talked about it before because I read that other people were worried about it. The other guys lurk on here, but I don't know if any of them have ever posted or even if they have accounts.

Also we won't need 16000rpm. With the turbo we probably won't make any power above 11500 rpm or so. We will probably choke the restrictor between 8500-9000 rpm.

[Grant Mahler]

Ok.

From what I understand, the fastest MS can go is ~8600 rpm, as that is the RPM limit for EDIS wheels. I'm not sure if this limit is from a loss of resulution from the trigger wheel spinning too fast and "blending" the trigger peaks, or if it is from the ignition circuits not having sufficient time to charge up/create separate events.

Anyone got any ideas? I was under the impression there were several other teams running MegaSquirt.

[Biggy72]

why do you have to run an EDIS wheel? Also wouldn't the time between firing be the same in this application as for any other bike ignition? If so it seems like there should be sufficient time for the coils to recharge.

[mkosonen]

Hey guys,

I'm the one in the video assembling the Megasquirt 2 box. We are the Megasquirt 2 chip, using the -Extra 2.0 firmware. This allows any missing tooth wheel to be used. In this case, ours is the 12-1 wheel. With batch, we are not using the cam sensor, with sequential we are using a cam sensor, and a single tooth. Both of our boards (batch and sequential) have 4 coil ignitors (no other ignition box required). There are guys on the MS forums running up to 15000-16000 rpm on a Honda with Megasquirt. It is amazing what the -Extra code enables Megasquirt to do, if you want to read up on it some more, check out the MS2 Extra site (http://www.msextra.com/ms2extra). I've been running Megasquirt on my personal car for years, and really like everything it has to offer, and love that it is open source, and is always evolving.

Matt Kosonen

[drivetrainUW-Platt]

Link to where they are running engines up to 16,000 rpm?

Our engine guy said we cant run spark fast enough with it and we need to run the stock ignition.....
We are using coil on plug of that matters, 02 Yamaha R6

[Biggy72]

http://www.msefi.com/viewtopic.php?p=185043&highlight=16000#185043

[consig]

We are running MS2 on a v3.0 board on a Suzuki GSXR600 engine. We have 240cc/min injectors which I think are stock. I was wondering if you found that you had to go to smaller injectors. We are having a hard time controlling idle because our required fuel pulse width at idle is so low (1.2ms) and the megasquirt resolution on pulse width is only 0.1ms. What idle pulse widths are you using, and are you able to idle under 1500rpm?

[Biggy72]

Those are some gigantic injectors. I'm not suprised at all that you had to drop the pulse widtdh so much. We're running a 19lb/hr injector and that's on the big side simply because we're going turboed this year. Last year we only ran a 16lb/hr injector and it did pretty well naturally aspirated.

[Poe]

Stock injectors seem to be around that same amount. Our F4i injectors were about 235 cc/min (which works out to around 21 lb/hr, which isn't much bigger than your 19's). We were at the limit of the stock injectors initial turbo/E85 testing last year, so I wouldn't say they were all that gigantic.

[consig]

Well we are certainly not running a turbo engine, I'll be interested to see what the pulse width is under load at high rpm when we get everything tuned.

Do you know if there is anywhere that i can find flow rate tests on some common stock injectors to get an idea of what flow rate i could expect if i lowered the fuel pressure?

[Biggy72]

that is something I hadn't thought about. How much pressure are you guys running Poe? We're at about 50psi.

[consig]

I actually just read in one of the MegaTune help files:

new_fuel_rate = old_fuel_rate * sqrt(new_pressure/old_pressure)

[Poe]

We were running around 45 psi static. One thing to keep in mind is that if the fuel pressure is lowered too much, the spray pattern will not be as good as it should be, and may cause some other problems. Best I can remember, resolution on our fuel map was around .1 ms as well, and we didn't have any trouble at idle. The 1.2 ms seems close to what it took for idle on our engine, if I remember correctly. We usually set engine idle speed between 1500 and 2000.