don17 Posted October 30, 2023 Report Share Posted October 30, 2023 cant seem to figure out why my idle jumps around, rpm target is 990rpm, after letting off throttle, ususually falls slowly to about 1100rpm, stay there for a random amount of time them falls to 990rpm. Can be sitting there with no throttle movment and just up randomly to 1100rpm. Supra link, throttle cable, iacv https://www.dropbox.com/scl/fi/wre7uwomojvbvg1xwx0je/idle-3d-base-table2.pclr?rlkey=r75hx0orsn5b101zun9kagidn&dl=0 Quote Link to comment Share on other sites More sharing options...
remski2 Posted October 31, 2023 Report Share Posted October 31, 2023 Post your log as well. Quote Link to comment Share on other sites More sharing options...
don17 Posted November 8, 2023 Author Report Share Posted November 8, 2023 On 10/31/2023 at 9:57 PM, remski2 said: Post your log as well. https://www.dropbox.com/scl/fi/e1fnlrwpo2hebkflfizym/Log-2023-10-14-3-25-37-pm.llg?rlkey=9ohigl8e24jofboztqoyhonpm&dl=0 Quote Link to comment Share on other sites More sharing options...
koracing Posted November 8, 2023 Report Share Posted November 8, 2023 Providing a log with it fully warm may help - but your idle ignition control table looked pretty conservative as far as how aggressively it changed timing to keep the idle on target. You can try this tune where I've modified that table and the idle igntion rpm lockout. Your 3D idle base table doesn't change much with your y-axis so not sure what the goal there was. https://www.dropbox.com/scl/fi/0hswtfaysnnoxjysaj3wu/Don17_SupraLink_idle-3d-base-table3.pclr?rlkey=1s8prmjt6jqpo5v55ikg0b5fe&dl=0 What IACV are you using - the oem 6 pin connector stepper motor? Quote Link to comment Share on other sites More sharing options...
Adamw Posted November 8, 2023 Report Share Posted November 8, 2023 It is your idle ignition turning on/off due to the RPM lockout. Be aware the idle ignition lockout uses actual RPM whereas the normal Idle speed control function uses RPM above target, so it needs to be set above your normal idle RPM. I would set the Idle Ign RPM lockout to about 1400RPM and the MAP lockout is a bit close to being breached when cold so I would increase that to 70Kpa also. And, as per Kris' suggestion, the idle ign table could be much more aggressive, I didnt look at his adjusted map but I would typically run zero error timing around 10deg so you have lots of torque in reserve and ramp in about an extra 10deg per 100rpm error. don17 1 Quote Link to comment Share on other sites More sharing options...
don17 Posted November 8, 2023 Author Report Share Posted November 8, 2023 5 hours ago, koracing said: Providing a log with it fully warm may help - but your idle ignition control table looked pretty conservative as far as how aggressively it changed timing to keep the idle on target. You can try this tune where I've modified that table and the idle igntion rpm lockout. Your 3D idle base table doesn't change much with your y-axis so not sure what the goal there was. https://www.dropbox.com/scl/fi/0hswtfaysnnoxjysaj3wu/Don17_SupraLink_idle-3d-base-table3.pclr?rlkey=1s8prmjt6jqpo5v55ikg0b5fe&dl=0 What IACV are you using - the oem 6 pin connector stepper motor? Okay I'll try your modified map thanks, I wanted to see if it was IAT making the idle change as it got hotter, the IACV is aftermarket 2 wire With the idle table could you post a example image or what you mean. I'm a little unclear Quote Link to comment Share on other sites More sharing options...
remski2 Posted November 9, 2023 Report Share Posted November 9, 2023 18 hours ago, don17 said: With the idle table could you post a example image or what you mean. I'm a little unclear Something like this. don17 1 Quote Link to comment Share on other sites More sharing options...
don17 Posted November 12, 2023 Author Report Share Posted November 12, 2023 On 11/9/2023 at 2:09 AM, koracing said: Providing a log with it fully warm may help - but your idle ignition control table looked pretty conservative as far as how aggressively it changed timing to keep the idle on target. You can try this tune where I've modified that table and the idle igntion rpm lockout. Your 3D idle base table doesn't change much with your y-axis so not sure what the goal there was. https://www.dropbox.com/scl/fi/0hswtfaysnnoxjysaj3wu/Don17_SupraLink_idle-3d-base-table3.pclr?rlkey=1s8prmjt6jqpo5v55ikg0b5fe&dl=0 What IACV are you using - the oem 6 pin connector stepper motor? tried your map and its fixed the issue. thanks so much! koracing 1 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.