Megasquirt ignition/fueling table size?

[holmesgraham]

Hello!

I'm new to this forum and am looking for a bit of advice. I am looking for an ECU that will manage a 1000CC motorbike engine that is going in my classic mini, to be precise its a BMW S1000RR engine. I have been looking at the specs of the MS3 and am unsure if the fueling/ignition tables will be big enough as the bike revs to 14200RPM.

Has anyone used this ECU up to these RPM's on these type of engines and would be willing to give there opinion of how the ECU performs.

Cheers!

Graham H

[radial]

I've seen multiple motorcycle engines run on Microsquirt(a updated MS2 in a tiny and handy Credit card size casing),and that is a "slower" unit than MS3.

Someone might put more facts on the table to reassure you.

As far as table size, you cant add more cells, buy you Can change the scale on each cell individualy to match your maximum rpm and kpa.

[elutionsdesign]

No problem, I think when you are done you'll be amazed how small the changes are across wide rpm ranges. You can also enable table switching based on rpm and get two tables for both VE and ignition (and AFR).

[billr]

My impression is that 14.2K rpm isn't all that high for the bike guys...

[nathaninwa]

I table switch on the fueling side because I wanted more break points for boost, and that allowed me to fine tune fueling over peak tq area and all around the map. My fuel table is essentially 26x31

[muythaibxr]

Engines operate pretty linearly, with large jumps only in a couple areas. 16x16 is enough for like 95% of the engines out there, maybe more. For the ones that need more than that, just use a second table and switch between them.

[ekam99]

Do you mean 1000rr with a throttle, traction, abs, quick-shifter...etc.???

[holmesgraham]

Thanks for your input guys, this really puts my mind at ease about using this ECU.

Yeah, it did have traction control and ABS but these are controlled by the original ECU. I did plan to use the original ECU but with all the extra rider aids and the ride by wire throttle it seems simpler to go aftermarket ECU as it's going in a classic mini, this also makes going forced induction easier!

[grom_e30]

my gsxr600 went to 14,500rpm that ran on a microsquirt quite happily i used table switching based on rpm so i had one spark table from 900-7000rpm and it switched over to the second ignition table from 7001-14500rpm.

[dnz]

my gsxr600 went to 14,500rpm that ran on a microsquirt quite happily i used table switching based on rpm so i had one spark table from 900-7000rpm and it switched over to the second ignition table from 7001-14500rpm.

Just curious as to why you need two spark tables? I would've thought if anything you would want a larger fuel table, not spark?

[grom_e30]

in ms2 the fuel table is 16x16 which i found was large enough, but the ignition table is only 12x12 and and between 1500 rpm and 5500rpm the timing at low load goes from 10btdc to 60btdc and the 12x12 was a little to small for me so i doubled the timing table to make the transition smoother.

[ekam99]

Thanks for your input guys, this really puts my mind at ease about using this ECU.

Yeah, it did have traction control and ABS but these are controlled by the original ECU. I did plan to use the original ECU but with all the extra rider aids and the ride by wire throttle it seems simpler to go aftermarket ECU as it's going in a classic mini, this also makes going forced induction easier!

Learn how to deal with oem ECU. Forced induction on 1000rr? IMO the best ever advice could be: sell a bmw engine, buy any of japanese 1000-1300cc for your project and microsquirt it. Don't ruin a top class machinery.