I know this is a kind of a redundant thread to my other one, but I felt this was an important enough discovery that it warranted its own thread.... Even though the thread title is targeted to short runner manifolds, there may be some benefits to stock TPI.

However, in order to do this, you need the S_AUJP xdf file for TP... Pretty sure v6 and v7 have it... not sure about earlier revisions. Can potentially search for the hex location if it's in an earlier revision but called something else.

But this was a freaking HUGE discovery for me. At least in terms of finding out what kind of a effect it can have.

AE-TPS, DRP Threshold Determining AE-MAP Reduction 0x536 (DRP = Distributor Reference Pulse)

Description: Any time both AE-TPS and AE-MAP are active, Final PW is reduced by a coolant based limiting factor based on TPS%. When >= this number of DRPs has been counted since the invocation of AE-TPS, Final PW will be reduced. When < this number, the Final PW reduction will be less than above. Increasing this value will provide larger Final PW when both AE-TPS and AE-MAP are active. Factory Default = 1 DRP

If you're in AE TPS and AE MAP simultaneously, it'll cut back on AE TPS. Other than emissions or fuel economy or something, it's absolutely stupid for a performance car.

AE delta TPS lasts for 12 DRPs in factory 8D. So what you'd do with the above parameter is set it to 13. Effectively disabling it. This is another instance where GM put these idiotic parameters that seem to fight against performance.

As an FYI, my AE TPS duration is set to 8 DRP's. For the Miniram, it follows the general philosophy having the AE come in quickly, do it's job and then finish up ASAP.

AE-TPS, Done if DRP Counter = 0x530

Description: AE-TPS is deactivated once the AE-TPS Counter equals this number of Distributor Reference Pulses (DRPs). The duration of AE-TPS can be extended by increasing this value. Factory Default = 12 DRPs

Like I said in the other thread... These "poison pills" that GM put into the code... I wonder if this is why people give up on the factory ECM and go aftermarket sometimes. GM's code literally fights against you. All these stupid lag filters, obscure coolant temp factors, enigmatic scalars that make AE WAY more complicated and frustrating than it needs to be... Once you disable all this nonsense, the 7730 essentially becomes a performance ECM itself.

 

What's fascinating about this, is that w/o Tunerpro, w/o the SAUJP xdf (which captured all of these obscure parameters), and without someone having gone in to take the time understand the ANHT hac and then to comment all on the descriptions of these parameters in TP and what they do, none of this would have been possible. Very thankful to all those folks.

As good as I thought I had this running just one year ago... by comparison, it was mediocre at best compared to how it runs now.

 

I'm noticing another benefit to this...

It's making the ECM more responsive (and consistently at that) to changes in AE TPS. Now that the ECM is no longer "underhandedly" pulling AE TPS fueling, the correspondence between changes and throttle feel is much more pronounced.

 

V5 of the XDF has AE TPS Limit Counter Threshold @ ox536 and it is set to o.
The second one is the same.
I am guessing the first one is totally different from what you describe.

 

My laptop died today, so I can't go in and verify it... It'll be a few days before I get a new one.

 

Had to download latest version of TP to get the latest v7 S_AUJP .XDF file to work.
Now I have AE-TPS, for PW limit Counter Test. Factory was at 0 set it to 13
AE-TPS, Done if DRP Counter =. Factory was set to 2, set to 12.

 

what is your factory bin? Every 8D bin i have is 12.

 

Probably not an 8D .bin.
Sorry

 

Oh hmmm..

If you open some other non 8D in the SAUJP xdf, youre going to get bogus results. Don't use a non 8D with SAUJP.

 

Thanks. I haven't been on here for awhile, I seen your post with 730 ecm, short runners, stealth ram, or something like that. Anway, my setup. I was in until you mentioned 8D then I had to think where my .bin originated from. So checking this .XDF you are using was actually good because I also have a 1990 Vette that I had tried to data log on over 10 tens ago with no joy as you know. So it seems that I need to catch up because the CCM problem appears to have been solved.
I also just found out about Rbob, bummer.

 

There's a related AE table I'm finding...

AE-MAP, AE-MAP PW Limiting Factor .vs. Coolant if AE-TPS Active 0x563

Description:

If AE-MAP and AE-TPS are both Active:
- If either or both of the fuel limiting bits are set (0x045 b6,
b7), a coolant-based factor from this Table is used reduce
the AE-MAP PW. The factor is however slightly reduced from
the Table value.
- If neither of the bits is set, the factor directly from the Table
is used.
The larger the factor, the larger the AE-MAP PW.

Question:

What are these fuel limiting bits? And is there some way to prevent them from ever being set? Or are those bits associated with the scalars described earlier in this thread?

 

I ended up setting this scalar to 0.

AE-TPS, For AE-MAP PW Limit Test if AE-TPS Active 0x52F

This item appears to only be used by GM in testing to possibly limit AE-MAP PW if AE-TPS is active.
DO NOT CHANGE UNLESS YOU KNOW WHAT YOU ARE DOING!
Factory Default = 1

The value can range from 0 to 255. When I swung it in the other direction 255, the car was sputtering so bad it wanted to die.

But setting it to 0 seems like it either disabled or greatly minimized the effects of that AE MAP PW limiting table above...

AE-MAP, AE-MAP PW Limiting Factor .vs. Coolant if AE-TPS Active 0x563

The ECM seems to have been screwing around with the AE Delta MAP "behind the scenes" with this part of the code. When I used to play around with that table, it had very severe negative effects (bad hesitation, near-stalling, etc). Now when I mess with that table, it barely has any noticeable effect...

It's absurd how much complex code went into the AE in the 8D code. Likely for emissions I"m sure.... But so many stupid behind-the-scenes lag filters, coolant factors, filter coefficients, etc... It's no wonder people get frustrated with this thing and go other ECM's like the EBL.

Once you disable all that crap and have the ECM use the standard AE tables at face value, it's crazy how much more responsive the engine becomes... And the follow through after the AE event is over... you can definitely feel the increase in torque via seat of the pants.

 

Lots of great info here. I'm not running SAUJP yet, but I plan to switch when I get a 383. Thanks for posting ULTM8Z.

Fred