At about 20-21 lbs during a long 3rd gear pull, a loud backfire happens and MS resets. My overboost protection is set at 249kpa, and the BASE number of sparks to cut is set to 3.
I feel like this is the wrong number of cuts -what would be a better number, 4?
BTW at about 21lbs, I was able to put down 300whp even. I left after an hour of tuning and my 3-4k rpm were still a little rich.
I sucks that there is no zoom feature on the MSlvv -I might need to start thinking about making something in visual basic.
#1605, "RE: Lound backfire, MS resets." In response to Reply # 1
Yep, exactly! I fought with this issue all summer long, only to finally find out it was due to a weak spark, caused by the dwell code in the MS Extra firmware. I havent tried out the version that was supposed to fix it, but I ultimately installed a Crane ignition CDI box, which completely solved the misfire/backfire. A rather expensive solution,but it works great. I still use the Mitsu ignitor to fire the Crane box.
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)
#1606, "RE: Lound backfire, MS resets." In response to Reply # 0
I've found that a lot of MS resets can happen because something sends current back into one of the outputs. For example... my 4G63 ignition module overheated a while back, which creates a condition called "thermal runaway" in the transistor which makes it not act like a transistor anymore and send current back into the processor. When this happens the MS resets.
#1607, "RE: Lound backfire, MS resets." In response to Reply # 3 Oct-30-05 04:04 PM by rs-pssst
I am using the mitsu ignitor, the v2.2 board, remote mounted TIP42C. I am not using a crane box.
This is great info.
I noticed that I am getting backfires more often in hard 3rd gears pulls @ 10psi+ -only once did the MS reset, so now I lowered the boost till this problem is under control.
Can I just increase the dwell to help this problem? Currently i am at 25/5.5/.1
Would the Mitsu ignitor be less likely to overheat when used with a crane box?
#1608, "RE: Lound backfire, MS resets." In response to Reply # 4
Originally posted by rs-pssst Would the Mitsu ignitor be less likely to overheat when used with a crane box?
Yes, because you're sending such a high voltage to the primary coil that dwell isn't really an issue anymore.
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
#1610, "RE: Lound backfire, MS resets." In response to Reply # 6
I had this issue with boost from 11-12+ psi. 10 psi it was fine. Its a weak spark. My ignitor stays cold when firing the crane ignition box. CDI boxes do not rely on dwell time, which is why it works with a dwell messed up code.
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)
#1614, "RE: Lound backfire, MS resets." In response to Reply # 8
Originally posted by rs-pssst My running dwell is 5.5. It is possible that it is over boost protection on the high boost. But backfires are happening at 11, 15, and 18psi.
That's what I was saying. If you were boosting 21 PSI and your Overboost Protection was set to 249 kPa, then the protection was kicking in (because 249 kPa = 21.something PSI). The 10-20 PSI MS resets are most likely the same problem that XtremeRS has encountered. Who knows why some of you guys are getting MS resets over 10 PSI... nobody that I know of has found a solution other than to use a CD box.
Originally posted by rs-pssst I just ordered the crane box yesterday
#1615, "RE: Lound backfire, MS resets." In response to Reply # 9
Yeah the problem with just upping the dwell time, it gets the ignitor super hot, which i dont think is a good thing. I mean, it can handle some intense heat, as that thing is bolted right by the cylinder head on the 4g63 engine. I also ran slightly larger plug gaps as well, which could have contributed to the misfires, esp when a weak coil charge is happening all at once. I ran around .032" gaps, and still run that with the crane box.
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)