Robert. Posted November 6, 2018 Report Share Posted November 6, 2018 Hi I'm just wondering how much deviation in lambda is acceptable on throttle transients, my situation is that i can tune all the cells with a reasonably close AFR at a steady state but soon as i release the throttle a tiny bit it instantly goes rich say from 14.7 to 12-13 afr and shutting the throttle completely makes the issue worse. I get as you shut the throttle this is closing the air off to the cylinder resulting in a rich afr but seems much richer than it should be. Just wondering if there are any work around to this or not? ecu is a v9 wrx plugin running a ej207 ID1050X injectors Thanks Robert Quote Link to comment Share on other sites More sharing options...
Typ17 16vg60 Posted November 9, 2018 Report Share Posted November 9, 2018 Hi, I got the same doing, goes rich when I close the throttle. I test it with a table where go minus injection by tps delta but not really helpful.. I'm interesting too for this doing Greetings Benny Quote Link to comment Share on other sites More sharing options...
Jeffersonc Posted November 9, 2018 Report Share Posted November 9, 2018 Following this. I having a similar issue where it goes rich for a moment after stabbing the throttle. I found adjusting the accel hold to 2 INJ events helped my engine setup. Try some adjustments on the accel sense and decay? I'm going to try adjustments in the clamp table this week, starting with lower rpm first so I don't possibly run into a lean spike during full throttle gear shifts. Quote Link to comment Share on other sites More sharing options...
Typ17 16vg60 Posted November 9, 2018 Report Share Posted November 9, 2018 I try it too with the accel option, but then goes my real accel fuel lean, so it was not a option for me Greetings Benny Quote Link to comment Share on other sites More sharing options...
Robert. Posted November 10, 2018 Author Report Share Posted November 10, 2018 Playing with the fuel table I got it a bit better The closed loop control in the factory ecu use to react quick enough to stop the rich spike whereas the link is a bit slower Quote Link to comment Share on other sites More sharing options...
Grant Pratt Posted November 15, 2018 Report Share Posted November 15, 2018 It is to do with "TAU" , wall wetting, fuel puddle are some of the names for what is going on. Our ECU does not have a correction model for this so this will always happen. If you tune to steady state targets it will only be right at steady state, if you accelerate through the map it will be lean and if you are backing off it will be rich all due to TAU. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.