2kBlk

Which is the better thing to do first? Convert to COP, then Megasquirt & wideband, or the other way around?

Any pros/cons to either?

jasonrobo02

iTrader: (13)

I have both of these waiting to install, so I'm in the same situation as you. Plenty of people have had success running the COPs on the stock ecu and plenty of people have success running the MS with the stock coils.

The only thing that I can think of is that the Toyota COPs require a dwell time that is shorter than the stock Miata coils, so perhaps being able to adjust the dwell via MS may lead to less stress on the coils and longer life.

I say install whichever you have ready first. If you build the COP harness before the MS harness, then install the COPs.

cjernigan

iTrader: (13)

Megasquirt, then COPs. COPs are easy compared to MS and will be an easy addition to your car once MS is up and running well. Plus you'll be able to run them at the correct dwell, though it doesn't really matter. Do what you please, either way it doesn't really matter.

Savington

iTrader: (31)

MS, then COPs. COPs are useless on stock ECU and stock power.

Arkmage

iTrader: (3)

I put on the COPs before I actually switched over to the MS for the long term. The MS was in, but I wasn't using it for anything but datalogging the stock ECUs AFRs. They did seem to add a little bit of pep and gave me a little better fuel economy on the stock ECU.

Zabac

iTrader: (39)

+1
MS&WB-COPs-Terboz
that's the order I'm going in

paul

iTrader: (21)

i vote for MS then COPs. That way if you forget to d/c the coils when setting up MS you don't burn out your new COPs

FHS

iTrader: (2)

Hey Andy. Hope you made it home from the autocross without too much drama.

Can you explain this? Reading the MoaCT and around the net, the recommendation to move over to COPs seems to be for a lot of benefits that have nothing to do with FI. Better idling, mpg, eliminating plug wires, easier to replace bad coils etc. The stock ECU "seems" to handle COPs fine. Why would they be useless on stock power for a Miata?

Zabac

iTrader: (39)

our stock dwell is too high for COPs

Arkmage

iTrader: (3)

how so? mine ran fine with the stock ecu and COP for quite a while. the COP never failed, misfired, overheated, etc. If it's "too high" generally the COP will discharge early to save itself and you get a misfire, OR it will overheat. Neither of which occured.

Zabac

iTrader: (39)

not saying it may not work, but general consensus is that people with MS lower the dwell a bit when running COPs, i don't have first hand knowledge to prove you wrong
but i think it's something like from 5.5ms to 2.5ms when running and from 6.5ms to 3.5 on cranking, again, no first hand

Arkmage

iTrader: (3)

hmm... I'm still running the DIY setting with my COPs. So if someone can specify a reason for changing this I'll do it.

Savington

iTrader: (31)

Specify the reason yourself. I've heard the exact same thing; stock is something like 5.5 crank, 5.0 run, and while it works and nobody's seen failures, the dwell they are actually designed to run with is in the 2.5-3.0 range.