Any risk when setting throttle req load tables high to force boost by gear tables?

[08Anamoly]

OK, so I am reading through the ATR user guide for the 10th time and am (I think) getting the hang of what to switch to achieve certain goals. The MAF is calibrated and ignition timing is where I want it. I don't plan on increasing the total requested ABS LOAD beyond the current max but I am interested in making 1st and 2nd boost higher like the high gears.

So, after looking at Cobb's Stage 1+ maps vs stock, I see the following:

1. Throttle - Req. Load - Max A --> set to a VERY HIGH value, 3.00 starting at 3000rpm through 7000rpms.

2. Throttle - Req. Load - Max B --> set to a VERY HIGH value, 3.00.

3. Throttle - Req. Load - Baro vs RPM --> Baros 11.27 and higher from 2500rpm and up are set very quickly to near 2.50 abs load request.

4. Boost Dynamics and Load Dynamics are unchanged.


Am I correct to understand that the above changes will force the ECU to use the Throttle Req Load - X Gear (high/low BAT) tables (assuming they are still at stock levels and therefore the lowest abs load targets of the tables mentioned)?

Is there any chance the ECU would still try and use the other tables which are set to super high abs load targets? I want to avoid any risk of those tables being used and ridiculous torque targets being aimed for by the ECU. Specifically, I want to target boost by gear. Any input?

[Realgib3]

The tables you're talking about are "max" tables which are just limiters, so they do not force the use of the gear based tables.

The tables you need to worry about are your TRL A and C tables and the Abs. load targets table.

[08Anamoly]

That seems correct except for the Baro v RPM tables. Those are also set very high to 2.50 all the way to 7000, which seems odd and the guide specifically lists this as a boost targeting table, not a max table.

So, to clear my head, the throttle req load (A & C), throttle req load X GEAR, and throttle req load: Baro vs rpm are all used by the ECU to target load (uses the lowest tables). Therefore, Cobb sets the Baro vs RPM and Throttle Req Load A & C tables to really high targets to force the use of the X GEAR tables (to be able to tune by gear). Correct?

[Realgib3]

Originally Posted by 08Anamoly That seems correct except for the Baro v RPM tables. Those are also set very high to 2.50 all the way to 7000, which seems odd and the guide specifically lists this as a boost targeting table, not a max table. So, to clear my head, the throttle req load (A & C), throttle req load X GEAR, and throttle req load: Baro vs rpm are all used by the ECU to target load (uses the lowest tables). Therefore, Cobb sets the Baro vs RPM and Throttle Req Load A & C tables to really high targets to force the use of the X GEAR tables (to be able to tune by gear). Correct?

Yes, you've definitely got the idea, BUT the A and C table are for CL operation while the gear based tables seem to be used during OL... So part throttle/ CL you may be targeting the TRL A/C and Abs load targets and NOT the X gear tables, even if the gear tables are set lower...

[08Anamoly]

Ok, that makes even a bit more sense considering how the A&C tables are recommended to be pretty much straight lined up (throttle smoothing posts) for people who want more of a NA feel when not driving hard.

Then, if its switching to the gear based load requests for OL/High throttle, should still run safely.

Last question: assuming I set the Baro vs RPM tables very high to tune by gear for OL/WOT, and the Abs Load and A&C tables to some very high amount (straight lined up for smooth part throttle response), is there any risk that the ECU might actually use the A&C tables or baro vs RPM tables for OL/WOT/High throttle conditions?

I surely dont want to target 2.50 Abs Load or higher in any gear, especially not to 7000rpms like Cobb's map tunes show! Maybe I should straight line those to a max of the Abs Load target max that I will have in my X Gear tables?

[Realgib3]

Originally Posted by 08Anamoly Ok, that makes even a bit more sense considering how the A&C tables are recommended to be pretty much straight lined up (throttle smoothing posts) for people who want more of a NA feel when not driving hard. Then, if its switching to the gear based load requests for OL/High throttle, should still run safely. Last question: assuming I set the Baro vs RPM tables very high to tune by gear for OL/WOT, and the Abs Load and A&C tables to some very high amount (straight lined up for smooth part throttle response), is there any risk that the ECU might actually use the A&C tables or baro vs RPM tables for OL/WOT/High throttle conditions? I surely dont want to target 2.50 Abs Load or higher in any gear, especially not to 7000rpms like Cobb's map tunes show! Maybe I should straight line those to a max of the Abs Load target max that I will have in my X Gear tables?

I won't say anything with 100% certainty with this car, but in 2 years of tuning every possible thing with this car I have never once seen it target those table OL/WOT for any reason if they are higher than your gear tables.

The other thing you can easily do that will have no negative affect is to set your max loads in your A/C/baro tables to the most load you will run in in any of your gear tables.