Cold air tuning
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
Cold air tuning Car is tuned in OLSD. After installing the BlueMaxx 92MM TB and the ported Fast92 intake, I've been fighting with stalling issues. The RAF is spot on for typical water temp range we see here. The VE is basically within 3% from 800-4400, all the way up to 105MAP. I played with spark and fuel at idle, and it seemed to respond best to dropping the commanded AFR to 14.0, so I richened 400/800/1200 by 5%. I also bumped the stall saver RPM up to 900 to match my idle.
It's supposed to be in the upper 20's or low 30's overnight tonight, so maybe I'll get better data on the low end of the RAF table. Richening it up near idle has helped a lot with the stalling, but the cold temps still give it fits. Even with a warm engine, sometimes it will want to roll up and down past idle.
If you think you have a method to ironing out this issue, please let me know what I need to provide
It's supposed to be in the upper 20's or low 30's overnight tonight, so maybe I'll get better data on the low end of the RAF table. Richening it up near idle has helped a lot with the stalling, but the cold temps still give it fits. Even with a warm engine, sometimes it will want to roll up and down past idle.
If you think you have a method to ironing out this issue, please let me know what I need to provide
TECH Fanatic
Joined: Aug 2005
Posts: 1,691
Likes: 1
From: Sunny London, UK
Yeah log idle trims as it heats up from cold, you can then adjust the whole range all at once. You can then add a tad more air as a margin. Like maybe 0.3g/sec or some such.
There is a good idle tuning tutorial on the efilive website.
There is a good idle tuning tutorial on the efilive website.
Here it is - Idle tuning.
For {B4307}; my car likes between -.03lbs/min +.03lbs/min average. (RAFIG)
For {B4307}; my car likes between -.03lbs/min +.03lbs/min average. (RAFIG)
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
I've got HPT, and RAF = Running Airflow = Desired Idle Airflow. It is within .5g from ECT of ~70*F to an ECT of ~240*F. I'll have to look through that thread and see if I can translate it to HPT.
Thread Starter
Joined: Jan 2002
Posts: 4,069
Likes: 74
From: Casselberry FL
Here's my average STIT vs. ECT results from a 20 minute cold start log this morning:
32: 3.44865
68: -0.09329
104: 0.13072
140: 0.16643
176: -0.31839
- I mapped throttle cracker vs. RPM vs. Speed, and some of those values are higher than what's in the calibration. Do I need to alter this table based upon the logged values?
- Same for throttle follower airflow vs. TPS... some of the logged cells are higher than in the calibration. Does mean I need to alter this table?
32: 3.44865
68: -0.09329
104: 0.13072
140: 0.16643
176: -0.31839
- I mapped throttle cracker vs. RPM vs. Speed, and some of those values are higher than what's in the calibration. Do I need to alter this table based upon the logged values?
- Same for throttle follower airflow vs. TPS... some of the logged cells are higher than in the calibration. Does mean I need to alter this table?
