Comments on: Injector Tuning http://tunedbyjake.com/ford-injector-tuning-intro/ Fri, 10 Dec 2010 17:39:09 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: Jake http://tunedbyjake.com/ford-injector-tuning-intro/comment-page-1/#comment-10 Jake Mon, 30 Nov 2009 20:36:35 +0000 http://tunedbyjake.com/?p=26#comment-10 Hi Con, recalibrating the VE and MAF tables should only compensate for the change in fuel flow with the Ford injectors compared to the OEM injectors. You shouldn't see a reduction in power at all since you're just increasing the capacity of your injectors. Have you logged your air/fuel ratio with a wideband since the injector swap? I'm assuming you have, but just checking. Are you using a dyno to figure horsepower or are you using the trans input torque PID from the computer? Using a dyno is the only real way to see what power you're putting out. The input torque PID uses a number of airflow tables to calculate torque input based upon total airflow and commanded fueling. Somewhere on the HPTuners forums there is a detailed description on the calculation, but in a nutshell it's not very accurate if you're anything beyond stock-like airflow. For instance my "calculated" trans input torque from my PCM reads out around 350 but I'm actually putting about 350 trq to the ground. Anyways, if you want to email me a log of the car I could look at it to see if there's something obvious. Thanks! Jake tunedbyjake@gmail.com Hi Con, recalibrating the VE and MAF tables should only compensate for the change in fuel flow with the Ford injectors compared to the OEM injectors. You shouldn’t see a reduction in power at all since you’re just increasing the capacity of your injectors. Have you logged your air/fuel ratio with a wideband since the injector swap? I’m assuming you have, but just checking. Are you using a dyno to figure horsepower or are you using the trans input torque PID from the computer? Using a dyno is the only real way to see what power you’re putting out. The input torque PID uses a number of airflow tables to calculate torque input based upon total airflow and commanded fueling. Somewhere on the HPTuners forums there is a detailed description on the calculation, but in a nutshell it’s not very accurate if you’re anything beyond stock-like airflow. For instance my “calculated” trans input torque from my PCM reads out around 350 but I’m actually putting about 350 trq to the ground. Anyways, if you want to email me a log of the car I could look at it to see if there’s something obvious.

Thanks!

Jake
tunedbyjake@gmail.com

]]> By: Con Maniotis http://tunedbyjake.com/ford-injector-tuning-intro/comment-page-1/#comment-9 Con Maniotis Sun, 29 Nov 2009 07:47:53 +0000 http://tunedbyjake.com/?p=26#comment-9 Fantastic write re calibration of 42lb injectors for GM application. I was wondering by changing the offset voltage as per your recommendations and re-tuning the VE table, would it cause a loss of power, or should I expect to see the same rwkw. I was down 35 rwkw, after changing the offset and VE table. I suspect that I have other issues and not the injectors. Thanks Fantastic write re calibration of 42lb injectors for GM application.
I was wondering by changing the offset voltage as per your recommendations and re-tuning the VE table, would it cause a loss of power, or should I expect to see the same rwkw.

I was down 35 rwkw, after changing the offset and VE table.
I suspect that I have other issues and not the injectors.

Thanks

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