Still having issues you can see it in my logs it only happens in 3rd gear. So I don't know what is going on. Might switch to dual table and see if that will help.

 

Can you describe the issue? Like I said before, the only reason staging will suddenly turn off is if you lose sync and one of the staging condtions is no longer met.... so if rpm goes to 0 and you're staging on rpm, the secondaries are going to turn off.

Ken

 

what happens if I try to do a full run by the time i get to 3rd I hear detonation so I lift. when you look at the datalog you can see at around 6000rpm the injector start going crazy but all other thing look normal no spikes just injector go nuts. I am running 550/1600 injector combo they are low and high mixed I was running resistor pack on the secondary before with no problems. When I had the first problem I tried to switch back in forth with the resistor to see. It made no difference. What made it work much better was the 24style wheel decoder setting.

 

Sometimes due to the low comms speed on the ms1, you can get spots where RPM is dropping to 0, but it doesn't show up in the datalog. This is most likely what is occurring.

I'll try to think of a way you can debug this to confirm that's what's happening, but a lot of people are using staging with no problem, and the only time I've ever seen a problem with it is when noise causes one of the staging parameters to no longer be met.

Ken

 

Does the tach signal look clean to you. I though is was good I should add a capacitor to it or something to help. Do you hook it up in series with the vr sensor. I have see post about it but I am not clear on how to hook it up. Thank for your help great need and appreciated.

 

I have had the engine all the way to 9800rpm @ 16psi with no issue. It only happen when I do long pulls through the gears.

 

what conditions are you using for staging? just rpm?

and easy way to see if it is your rpm is to make an OR condition with your tps above 800 (80%) or something to test. if it still drops, it's not your rpm signal.

 

I keep having the same issue although I also have made some progress. Im very much intrigued at the fact that I am also running 550cc /1600cc. Car is using stock wiring, pnp setup to connect the squirt, plus modified CAS, one VR circuit. I have tried the following:

changed the stock signal wire to a shielded wire for the CAS. I was having spikes and found out the stock wire was iffy at the connector by the CAS. Decided to replace it completely. It cured some hesitation, but not the main issue.

Changed both coils, sparkplugs, sparkplug wires. Problem remains the same.

added an extra ground to the engine block. Made sure MS unit is properly grounded, checked wiring and made sure no loose connections. Adding the extra ground didn´t improve anything.

AFR is rock solid when the detonation occurs. Just so you know.

Made sure I was running the correct wheel configuration 24s9style (always have)

Im sure I tested rpms being the condition doing an OR condition (problem persisted) in staging, but will test tomorrow again on my way to work.

Im running out of options and Im considering either redoing the wiring completely, (new harness for megasquirt and eliminate stock crap), building a new VR circuit with a premade board, adding the capacitor to further clean the signal. Troubleshooting seems to be moving towards the MS unit, if I really want to isolate the issue completely to MS, I will have to swap to the Stock ECU, but Ill have to figure out a way to revert back to stock secondary injectors.

 

well sorry to hijack this thread...

switched to MAP based injector staging problem continued...so it's not ignition 100% in my case. 13bdarren do that test to confirm your issue, well worth it.

I logged the drive to work this morning and made sure car detonated several times. Check out the lean spots. AFR gauge is not registering this at all, but log is, don't know if the analog output is wrong or I set it wrong.

 

I have tried playing with the staging but got nothing is seem to be the ms unit with me too. I might try to find some new injectors that match. Right now I have low and highs. Yours seem to be doing the same thing. Problem doesn't pop up till 3 or 4 gear. I never hade this problem before. This is my 3rd year running ms I have had many issue along the way but this one is a wierd one. I also still can't get trailling to work right. I just gave up using it. I don't know if they are related.