tuning & preventing AE

[Yves]

When going to tune, how do you stop AE from kicking in ?

I see that there is a minimum and maximum rpm threshold. Currently the min. is set to 2500 and the max. to 5000. Can I set it to 8000 and 10000 respectivelijk to get it out of the equasion ?

[kjones6039]

You can just raise the TPSdot threshold to 1000, but why would you want to do that anyway?

Ken

[billr]

I don't know about the OP, but I have AE turned-off that way so it doesn't get in the way of my other tuning fumbling (add to the confusion of what is affecting fueling). Yeah, there is a slight hesitation when the throttle is opened a bit, but with enough power, that is hardly an issue for me on the street.

[Yves]

Ok, I have Tunerstudio v.2.6.01. In the AE wizard dialog I have a TPSdot Threshold (%/S). It's currently set at 300.0. Not sure if that's the same ?

[kjones6039]

In the AE wizard dialog I have a TPSdot Threshold (%/S). It's currently set at 300.0. Not sure if that's the same ?

That is correct. A value of ~1000 will effectively turn AE off.

Ken

[BigLou240sx]

I see that there is a minimum and maximum rpm threshold. Currently the min. is set to 2500 and the max. to 5000. Can I set it to 8000 and 10000 respectivelijk to get it out of the equasion ?

It's a moot point now, but just an FYI - the AE settings are opposite of what you describe.

Minimum RPM = from 0 to Min RPM, 100% of commanded AE is applied
Maximum RPM = anything over Max RPM, 0% of commanded AE is applied

In between Min and Max RPM, a linear scale down is applied - using the standard 2500/5000 settings, at 3750 (half way between Min and Max), 50% of the AE would be applied.

So in order to do what you were asking, you really would need to set the Minimum and Maximum to a very low RPM in order to disable it that way.

See: Page 53, 3.4.6.2 Time-based Accel http://msextra.com/doc/pdf/Megasquirt2_ ... Up-3.3.pdf in the new manual
The old manuals had a graphic that helped illustrate this point: http://msextra.com/doc/ms2extra/MS2-Ext ... html#accel

[Yves]

Thank you for explaining that.

Could you explain the TPSdot threshold ? Is that 300 figure in there correct.

Also, I do not understand the ..dot at all.

[BigLou240sx]

Thank you for explaining that.

Could you explain the TPSdot threshold ? Is that 300 figure in there correct.

Also, I do not understand the ..dot at all.

"dot" in these cases means change over time; for TPSdot it is change in TPS/second or similar time interval. For fast throttle movements, ie, stabbing full throttle, you would expect to see a high TPSdot value (meaning high change in TPS over a short amount of time)

TPSdot threshold sets the minimum TPSdot value before any AE is applied to the fueling calculation. It is the point that says below this much/fast throttle movement, the engine does not need any acceleration enrichment, and above that much/fast movement, the amount of enrichment is governed by the TPS AE curve.

Hard to say what is "correct" for the TPSdot figure - if you want to disable AE for the time being, a number of 1000 would be good. However, if you're looking for the final number to have a properly adjusted AE behavior, it will be the minimum amount/speed of throttle movement that the engine needs acceleration enrichment and where false triggers by noise are not affecting AE. For example, you would not want to set that number to 20 if you see your TPSdot reporting 40 while not touching the throttle. I believe I have mine set to high 100s (maybe 180?)

[Yves]

Thanks again Lou to take the time and explain it that well !!

[kjones6039]

For example, you would not want to set that number to 20 if you see your TPSdot reporting 40 while not touching the throttle. I believe I have mine set to high 100s (maybe 180?)

I fully agree with Lou........ As an example, I am able to run a value of 20 without unwanted triggering. My point being...... You will, no doubt, need to find a number (as Lou did) that works for your particular setup.

Ken

[Yves]

It currently also runs 100% on tps. Is it better to incorporate map as well ? If so what % ?

[kjones6039]

Is it better to incorporate map as well ?

Just one guys opinion, but I would never incorporate map! If you do some searching around the forum, I think you will find that I am not alone in this opinion.

Ken

[Yves]

Is it better to incorporate map as well ?

Just one guys opinion, but I would never incorporate map! If you do some searching around the forum, I think you will find that I am not alone in this opinion.

Ken

Ok, I have 100% tps at the moment.

[JAM]

i believe the "dot" comes from way to denote a derivative in calculus. Time based rate of change, otherwise known as the slope of the position curve with respect to time.
is this correct?