Hello all! i have been messing with my tune for years trying to get it to idle perfectly. Read a ton on here, tried many things, finally asking for some advice.
It has a really light flywheel/clutch (RPS carbon fiber clutch) and i think that ends up causing 80% of the problem. It also smells horrible. I had this mostly tuned out at one point but it came back when we updated the ECM software from the dealer and put the same calibration back on..
So the main things I'm trying to figure out are:
1. how to keep it from stalling randomly. This is an oddball, sometimes it works perfectly, sometimes it floats the rpms a bit and then settles, sometimes it just seems to ignore everything and flies right by the idle target and stalls like it's not even trying, and sometimes it gets real low and brings itself back up.
2. how to get rid of the fuel smell especially while cruising, i know there's always going to be some at idle but trying to minimize it here
attached is a tune, if you see anything WAY out of place let me know. it works decently, even though i changed some things around in it (you might see some really low follower step downs and things where i was trying to control the rpm decline rate , but after doing even more testing this might reference the proportional airflow table even if the proportional idle isn't being used??)
Trying to figure out the relationship between the tables in this ECM is a nightmare. There's NO PID's in the scanner that I can see which tell me what it's TRYING to do other than desired airflow, spark, things like that. Really frustrating.
It especially stalls more if the a/c is on right now.
Hoping there's something obvious i'm missing here. It's possible I simply need to add more base airflow, or the timing is off somewhere. I can upload a log after I grab one tomorrow.
Realizing how annoying E67 is..
I was also thinking about how to keep a lot of torque in reserve maybe by upping the airflow and forcing the ecm to use timing to lower the idle so there's reserve timing left over.
The funny thing is, once it is idling it won't stall easy.. I can let it out in 1st gear and it will drive itself down the road even up hill some, but as soon as it transitions off of idle it starts to have issues.
Thanks!
Engine is LSX 7.0L , LSX heads, medium cam i think it's 228/240 at 0.050 and 272/292 at 0.006 , .635 lift, 118 LSA +4
RPS BC3 clutch (super ilght), N/A right now trying to get it correct
Long tube headers, full exhaust
LS2 TB (i tried ls3 but the airflow numbers were all weird, the ecu didn't like it and idle was way crazy)