ctuinstra
Goblin Guru
Lesson learned. Be careful how you place your air filter. During our build, I thought that it would be a good idea to keep it up in the surrounding air and away from any engine heat. It was standing almost straight up. Well, during tuning of the MAF tables, I was out collecting logging data and when a gust of cross wind would come, it would blow the AFR off the charts! During slower driving and no wind, they would be right were the should be. I couldn't even get a few miles before returning home.
I still had the 45 degree 3" silicone provided by DF that I never used. I repositioned in down behind the driver's seat and below the coolant tank. Took the car back out and never had a problem! AFR were spot on all the time. The difference is incredible! When running on the MAF alone, it would darn near kill the engine with a huge gust of wind. I guess running normally with dynamic airflow (using the MAF and VE tables to calculate) it would not affect it as much, but I'm sure it still did.
This is what I used to have.
This is the set up most have and what I changed to:
This is with the original set up. AFR Cmd is what the ECM is wanting and "commanding". The WB AEM is the actual AFR coming out of the tail pipe. Keep in mind, this is only running using the MAF sensor to control the fueling, nothing else (basically).
This is just moving it, no other changes to the car or tuning!
Lesson learned. Credit to my dyno tuner, last year he said the air filter was in a bad spot. Now I believe him.
I still had the 45 degree 3" silicone provided by DF that I never used. I repositioned in down behind the driver's seat and below the coolant tank. Took the car back out and never had a problem! AFR were spot on all the time. The difference is incredible! When running on the MAF alone, it would darn near kill the engine with a huge gust of wind. I guess running normally with dynamic airflow (using the MAF and VE tables to calculate) it would not affect it as much, but I'm sure it still did.
This is what I used to have.
This is the set up most have and what I changed to:
This is with the original set up. AFR Cmd is what the ECM is wanting and "commanding". The WB AEM is the actual AFR coming out of the tail pipe. Keep in mind, this is only running using the MAF sensor to control the fueling, nothing else (basically).
This is just moving it, no other changes to the car or tuning!
Lesson learned. Credit to my dyno tuner, last year he said the air filter was in a bad spot. Now I believe him.