Hey all, I'm tuning accel / tip-in fuel on my NSX with an AEM Series 1 (though likely similar to Series 2). I originally started messing with it because there was a slight lean condition with a quick TPS change. Generally, it'd go lean for a sec, then go rich; it felt late to correct, then when it did it'd overcorrect. Seemed like an easy fix: increase the TPS sensitivity, pull some fuel from the tables.

The original settings that came in the car:

Accel dTPS Trigger: 10
Accel Limit: 80
Accel Pump Sustain: 35.16
Accel TP Sensitivity: 69.92

I did some experimentation with these settings + adjusted the "TPS Accel Factor" table. I was able to get the AFR close to what I wanted on a large TPS change, but still cant get it to chill out when cruising.

Accel dTPS Trigger: 10
Accel Limit: 70
Accel Pump Sustain: 24.22
Accel TP Sensitivity: 78.91

I feel like I am missing something. Here are my assumptions on a couple options & params.

Accel TP Sensitivity option

The lower the value, the more it smooths the TPS signal. So the lower the value, the slower to react to TPS changes the trim will be. The goal is to get this as high as possible without triggering it all the time.

The Throttle param is smoothed by the Accel TP Sensitivity option to get the TPS Filtered param.

This all correct?

Based on other threads all over, it seems like most people are running a pretty high sensitivity value: like 90%. It's possible my TPS signal is way noisier than other setups, though.

Accel dTPS parameter

On an AEM thread (series 2 tho) AEM says that Accel dTPS "is the difference between Throttle and TPS Filtered". Is that right? It's diffing the noisy raw TPS signal with the smoothed signal?

Accel dTPS Trigger option

The user guide says this

> Accel dTPS Trigger: When the change in TPS (dTP) exceeds this value, Fuel Trim (Accel) can be added. This acts as a minimum TPS change threshold for Fuel Trim (Accel).

So I assume when the "Accel dTPS" param is over "Accel dTPS Trigger" option, it will add fuel. And when it's adding fuel, the Accel Fuel param will have a non-zero value.

Is this correct? If not, how does Accel dTPS Trigger relate to the Accel dTPS param?

My assumption is not what I'm seeing. Here Accel dTPS Trigger is 10, Accel dTPS is like 3 or 4, but Accel Fuel (also "Fuel Trim (Accel)") is non-zero and affecting the AFR.



In this case I want it to correct at the actual throttle change (see big arrow toward the right), but not when the cruising.

The cruising dTPS vals are less than 5, and the actual change is > 5. It _seems_ like I should be able to set the Accel dTPS Trigger to 5 and have it pick up the changes I want. But right now, it seems like the 10 trigger value is being compared against something larger than Accel dTPS.



Other questions

* Is my TPS noisier than most? It fluctuates like 3%, is that normal? I have a new one coming as an experiment.
* How smooth should the TPS Filtered param be? If it's fluctuating 1% or so, is that ok?