GTO 416 LS3 E40 Idles Higher Suddenly, Speed Density Tune

[cburb88]

Just starting out on the hptuner game, been reading alot and watching vids, but recently i notice my car has been idling higher then usual, it was around 1k now its been 1100ish and sometimes it will hang up at like 1500-1600 specially after its warm, you rev it and the rpms will travel down to 1600 ish and stay there. It doesnt always do it kinda strange but when its idling high i can let out on the clutch a little to load the engine then it will usually drop down around 1000, rev it again and it hangs. Regardless it almost always idles in the 1100s now instead of 1000 which is bothersome.

It drives very strong otherwise no issues, from what ive read i might have to change airflow final minimum settings or the under and over idle adaptive spark control? Not sure why all the sudden its running like this but the outside temps have been lower recently not sure if thats enough to make it do this.

both 93 and e85 it does the same thing, my cam is a ed curtis 646/616, 254/240, 115 btw, need to know anything else just ask its a fully built engine.

Attaching my tune and a log, not sure if i have the right PIDs im still new as hell at this. appreciate any help. At 3:46 into the log i blipped the throttle and you see it hang afterwards. The hptuners mph is reading slow slightly, no idea why but when i corrected my speedo the hptuners doesnt match it...they like arent in sync with eachother.

[sgod1100]

Just starting out on the hptuner game, been reading alot and watching vids, but recently i notice my car has been idling higher then usual, it was around 1k now its been 1100ish and sometimes it will hang up at like 1500-1600 specially after its warm, you rev it and the rpms will travel down to 1600 ish and stay there. It doesnt always do it kinda strange but when its idling high i can let out on the clutch a little to load the engine then it will usually drop down around 1000, rev it again and it hangs. Regardless it almost always idles in the 1100s now instead of 1000 which is bothersome.

It drives very strong otherwise no issues, from what ive read i might have to change airflow final minimum settings or the under and over idle adaptive spark control? Not sure why all the sudden its running like this but the outside temps have been lower recently not sure if thats enough to make it do this.

both 93 and e85 it does the same thing, my cam is a ed curtis 646/616, 254/240, 115 btw, need to know anything else just ask its a fully built engine.

Attaching my tune and a log, not sure if i have the right PIDs im still new as hell at this. appreciate any help. At 3:46 into the log i blipped the throttle and you see it hang afterwards. The hptuners mph is reading slow slightly, no idea why but when i corrected my speedo the hptuners doesnt match it...they like arent in sync with eachother.

yeah i would start with lowering the airflow minimum setting by small amounts and see if that changes the hanging rpms

[cburb88]

Im curious by what amount should i lower it and where at on there, like should i change across the board or just lower it around 1000-2000 rpm on like N and 1st?

[Lakegoat]

Lower it from 800 to 1200 rpm. All the cells. I would highlight it and reduce by 3.00. That would make the 14.00whatever 11.00. A t 1100 idle, your timing is 10 or lower. That's the indicator that the final airflow is too high. You have commanded 22 degrees which is about where it goes when you blip the throttle and runs up to 1600. I will post mine in a minute.
Mine has a 102 also along with cam,etc

[cburb88]

Just a follow up, i went -20% on the entire final minimum table. Now it doesnt constantly idle around 1100 and randomly spike to 1500ish like it was, its sitting steady at just under 1k and (knock on wood) the idle hasnt spiked up randomly yet, thanks.

[Lakegoat]

Couple of things___ Under spark, Enable spark smoothing since you are a manual trans. In your list of mods, you show 80# injectors and a return system. Your tune under Fuel is not set up for those injectors or a return system. All that can give you problems also. Your coastdown spark table doesn't look correct either.

[cburb88]

Oh thats lovely i guess tuner didnt do everything. Im really new to tuning so i doubt id be able to make the changes it needs.

[Lakegoat]

He took the easy way out. Max injector on the E40 is 63.5# and that was what he used to max out the reading. If you look up Deka 80#, they flow about 90# at 58psi. You double stoich, half ifr, half ivt terms and insert all of the deka data in the fuel tab. It would be easy for your tuner to correct ---easier if he would not have been lazy the first time.

[cburb88]

Yea i wouldnt know how to change all that myself, i mean it runs good puts down great power, it bucks a little slowly cruising and other then that its great.