| Go back to previous topic |
| Forum name | Engine Management Systems & Controllers |
| Topic subject | Megasquirt tuning 2-3k stutter and backfire |
| Topic URL | https://forums.2gnt.com/dcboard.php?az=show_topic&forum=i54&topic_id=3552 |
3552, Megasquirt tuning 2-3k stutter and backfire
Posted by wickedtalon, Jan-06-08 10:39 AM
I'm having a problem between 2-3k rpm since I installed larger injectors. I've tried leaning it out but it still backfires before I hit boost. The plugs dont seem to last as long as before I upgraded injectors. It drives great at all other rpms but I cannot CRUISE normally. I have to drive it in a lower gear and be above 3k. I'm running stock ignition w/ megasquirt v3.0 controlling the 780cc injectors. I've been tuning manually in megatune. Not quite sure how to use VE analysis in MegaLogViewer.
Can anyone that knows what they're doing take a look? This is the last log and msq file.
http://www.2gnt.com/documents/wickedtalon_megasquirt200801051940_tuned2.msq
http://www.2gnt.com/documents/wickedtalon_datalog200801052147.txt
change the txt file to xls
|
3553, RE: Megasquirt tuning 2-3k stutter and backfire
Posted by justins71, Jan-06-08 01:19 PM
I wouldn't run RPM-based accel unless your stuff it pinpoint tuned, or only track-driven. Also in your Fuel Table Selection, you have both GammaE's turned off... this means it won't compensate for any changes (CLT, MAT, Accel, etc) - may wanna try those on. Reason I'm targeting accel is you log shows a lean spike whenever you even slightly change manifold pressure. You're also running really lean in your high end boost - give that VE analyzer a try. It's really something! Otherwise you logs don't really show a miss - maybe you have some other mechanical issues?
|
3556, RE: Megasquirt tuning 2-3k stutter and backfire
Posted by wickedtalon, Jan-06-08 02:56 PM
Cool. I'll try those changes. What exactly will the GammaE do when its on? Do I need to change an other settings for this to work right?
|
3558, RE: Megasquirt tuning 2-3k stutter and backfire
Posted by justins71, Jan-07-08 02:52 PM
GammaE just takes into account those inputs like MAT, CLT, EGO(I think) to compensate your injector output. without it on it just goes by your table. You also have accel time as 0.0 ms, try something like 2.5 or so on decay. I could shoot you my .msq if you'd like, car's been runnin pretty well for me
|
3562, RE: Megasquirt tuning 2-3k stutter and backfire
Posted by wickedtalon, Jan-09-08 06:04 AM
The car runs like a champ now. Thanks for the help. I changed some settings and fixed the super420a ecu.
|
3563, RE: Megasquirt tuning 2-3k stutter and backfire
Posted by justins71, Jan-09-08 08:34 AM
glad to hear!
|
3583, RE: Megasquirt tuning 2-3k stutter and backfire
Posted by ivan300, Jan-22-08 09:15 AM
heh i have been having the same issue, what i did is just richen the are to make it drivable, Ill give this a try
also justins71 would you please post your msq just for comparason. Thanks
We really need to setup a msq database.
|