adham Posted July 3 Report Share Posted July 3 Hi everyone I'm having what seems like fuel cut at 100kpa. Probably boost cut. I can't find the problem it had been a couple of days Engine m50b25 Injectors 840cc Radium fuel system 4.5 bar Storm g4+ black External wastegate Link boost controller Link 4 bar MAF. I tried the following Open loop control with map limit 250kpa Removed MAF limit from engine protection Disconnected wastegate line from boost controller Tested MAF sensor by connecting it to air compressor outlet. It reads perfectly At all the above tests the same issue persist Fuel cut at 100kpa Under 100 kpa AFR is perfect and so is ignition timing Any ideas are greatly appreciated. I'll send a full log and the file tomorrow Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 4 Report Share Posted July 4 Attach a log and tune. Moving this post to the G4+ forum. Quote Link to comment Share on other sites More sharing options...
adham Posted July 4 Author Report Share Posted July 4 hi @Adamw thanks for your support . heres the file with log where the problem is happening any suggestions are greatly appriciated boost cut 100kpa.llg boost cut at 100 kpa.pclr pclink version version 5.6.8.3669 Quote Link to comment Share on other sites More sharing options...
adham Posted July 4 Author Report Share Posted July 4 Let me know if any other information is needed Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 4 Report Share Posted July 4 There are no limiters or cut active in your log. You have a misfire. The first thing that looks out of place to me is there is a crap load of fuel going in if it really does have 840cc injectors. Change the accel fuel load correction back to 1 and reduce the master fuel value to see if it runs better with less fuel. What ignition coils does it have? Quote Link to comment Share on other sites More sharing options...
adham Posted July 5 Author Report Share Posted July 5 Audi TT coils Quote Link to comment Share on other sites More sharing options...
adham Posted July 5 Author Report Share Posted July 5 Thanks @Adamw Yes it runs better now thanks. Reduced master fuel from 14 to 10 Reduced acceleration wakeup load to 1 Is there something else? Still same issue at 100kpa Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 6 Report Share Posted July 6 Can you give more detail about the history - Im assuming it has been tuned and was previously running correctly? Quote Link to comment Share on other sites More sharing options...
adham Posted July 6 Author Report Share Posted July 6 The engine haven't been tuned yet. It's a fresh build . Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 8 Report Share Posted July 8 Your MAP sensor looks suspicious to me in that it appears to flatline/bottom out at 35Kpa and doesnt increase until you get over about 15% throttle. The coil dwell is way too much for VAG coils, they typically work around 1.8ms. There is nothing much else obvious in your log. Quote Link to comment Share on other sites More sharing options...
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