#841, "Spark issue at 15 psi with MS running ignition"
Well I got the car running great up to 10-11 psi,but when i try to run 15psi, i get a BIG backfire out the exhaust and the car bucks hard, and at the same time, the MS resets. I thought it was from running too rich, but it's not. After some leaning out of the VE map at that pressure, it still did it. I then reconnected the stock ECU to run spark, and it ran just fine, like it always did at 15 psi. I'm wondering if the 3.5ms dwell time is not enough for a strong spark at that boost pressure. Someting just isn't right somewhere. Nate, did you ever scope the stock ignition trigger signals to see what the ECU is using for dwell time? It's either the dwell settings not right, or big tach dropout at that pressure for some reason. I don't understand why the MS resets either when it backfires..The Mitsu ignitor stays really cool at idle, which is why i think we could up the dwell a bit for a stronger spark. Anyone have any insight?
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#936, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 10
if that doesnt work summit does sell the Fast idle solinoid. I cant remwember the part number but it is on MEFI, i will search for it. Cost is like 70.00 though. I like doug's idea
#1136, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 11
As an update here, James over at msefi.com, who writes the "extra" code, said that the wasted spark dwell is not right yet..which is prob why i'm getting a weak spark/misfire. I've used an analog dwell meter, and also measured the current draw comparing the stock ECU doing ignition, and then the MS, and the MS is a noticable decrease in both dwell time, and current draw. Even with dwell maxed out, it still does not match the stock ECU signals.
So in order to be done with it, I ended up ordering a Crane HID2 ignition CDI box..These dont rely on dwell time, and i'll get the best spark i can possibly get with the stock coilpack. I think i'll end up driving the Crane with the mitsu ignitor, instead of off of the MS directly..I would think it would keep noise at bay anyway, and it's really how the Crane unit was designed to work. We will see how it works by mid week or by the end of the week after i get it in...
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#1137, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 12
Damn you gave in, heh. That's really weird how some setups work fine with the 4G63 transistor but yours is misfiring. I can't quite put my finger on it. A shot in the dark... Have you tried the MS 3.0 board yet?
#1138, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 13
Originally posted by ner947 Damn you gave in, heh. That's really weird how some setups work fine with the 4G63 transistor but yours is misfiring. I can't quite put my finger on it. A shot in the dark... Have you tried the MS 3.0 board yet?
Nope, havent tried the new board version yet..That will be a project for the winter i suppose, not in a huge hurry to upgrade, since the car is running really well now(fuel side anyway). I've always thought it was dwell related, as I can tell its a weak spark...James himself said dwell for 2 spark outputs is busted sooo.. If you think about it, there really are not that many people running wasted spark, plus forced induction with the MS..I mean, the spark is fine up to 10psi or so, which means those who are running this type of ignition setup, may never even see this type of issue. There are tons more people running distributors, and the ford EDIS setups, which dwell for both of those are fine..
One thing of interest though, I put my adjustable timing light on the car, and had the advance set at 15 degrees in MS, then set my light to 15 degrees on the knob, and the light fires right on both of the cam TDC marks even..so looks like timing is damn near right on to what you set it to in the MS..
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#1140, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 14
Originally posted by XtremeRSOne thing of interest though, I put my adjustable timing light on the car, and had the advance set at 15 degrees in MS, then set my light to 15 degrees on the knob, and the light fires right on both of the cam TDC marks even..so looks like timing is damn near right on to what you set it to in the MS..
I got similar results measuring ignition event on my scope overlaid with the crank angle sensor output... I set the MS fixed to 29 degrees and it lined right up on a noticeable crank angle tooth.
#1141, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 15
Well I got the Crane unit hooked up, and it runs GREAT Spark is very strong now, and it pulls excellent at 15 psi. Unfortunately, it was an expensive solution, but i'll never have to worry about spark strength ever again. I was unsure what to set dwell at in MT, knowing that the Crane unit does not rely on dwell, so I just chose 3.0 ms, and the mitsu ignitor stays super cool as well. The mitsu ignitor seems to like firing the Crane ignition box. Sweet.
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#1146, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 17
Originally posted by rs-pssst I really wish it doesn't have to go aftermarket ignition. extremers, have you turned up the boost to 21 psi or higher yet on MS? How is dougie2 running 26psi on MS without spark problems?
I have NO idea why others can run more boost without any spark issues..I'm totally baffled by it. Maybe my stock coil is a bit weaker for some reason, or maybe there is less voltage at the coilpack for some reason..But anyway, the guy that writes the MS code had said that the dwell portion of the code for wasted spark was not working right, and has now released an updated code version to try out. I will get around to trying it out, but not for a while yet..The car's running awsome now at 15 psi though, so I'm not too inclined to keep changing code and settings..i've been doing that all this season ever since I got the damn MS up and running..Now it's August, and it's finally right..Oh well
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
#1147, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 18
Got a question... Is 200-300rpm surge at idle a problem you have noticed with the mitsu ignitor or should I just play around with the timing numbers a bit more... I wasn't sure if that surge was from IAC freaking out.
#1148, "RE: Spark issue at 15 psi with MS running ignition" In response to Reply # 19
Originally posted by rs-pssst Got a question... Is 200-300rpm surge at idle a problem you have noticed with the mitsu ignitor or should I just play around with the timing numbers a bit more... I wasn't sure if that surge was from IAC freaking out.
It's mostly the IAC...For now, i've taken out my IAC, and tapped the pintle hole in the TB for a bolt, and used a washer on the bolt to seal up the hole where the IAC bolts on the TB. So basically, both holes are sealed with one bolt. The only major downfall to doing this is you have to keep your foot on the gas for a little bit as the motor warms up..after that it's fine. You just cant simply unplug the IAC, because boost will push in on the IAC pintle, and cause a high idle..
13.5 @108 MPH-2.2 60ft(stupid FWD!) S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential fuel injection) My webpage: http://eclipsed4evr.home.comcast.net -1998 Mitsubishi Eclipse RS-T- "Toy" -1992 Plymouth Laser Turbo AWD(SOLD) -2000 Honda CR-V(daily)
Spark is very strong now, and it pulls excellent at 15 psi. Unfortunately, it was an expensive solution, but i'll never have to worry about spark strength ever again. I was unsure what to set dwell at in MT, knowing that the Crane unit does not rely on dwell, so I just chose 3.0 ms, and the mitsu ignitor stays super cool as well. The mitsu ignitor seems to like firing the Crane ignition box. Sweet.