Initial Details into How The Boost Based Tuning Works with AccessTUNER

[Christian.]

Originally Posted by bmorrisj how does this boost based switch affect ignition timing? since the ecu doesn't use full set timing if not necessary with achieved load. (or is that even correct?)

This does not affect how the ECU look-ups and calculates ignition advance values. The ECU will continue to use RPM and Calculated Load for the main ignition advance look-up functions.

Originally Posted by Lex If you've played around with this, how much do initial conditions matter? In other words if I start with 100% in the WGDC table, how much does the boost overshoot for example? Also, say there is a MAP sensor failure, does the ECU revert to using the WGDC table only?

I have properly calibrated boost controls thus far. I've not intentionally thrown off WGDC in order to see what happens. My guess is that boost spikes and oscillations will be introduced if WGDC is set to high.

I have not created a failure scenario for the MAP sensor in order to see how the ECU will respond...although, I do believe that you should be able to zero out the Boost Dynamics table and then the ECU should operate with a open-loop boost control system and just run what is in the tables.

Originally Posted by bmorrisj would the tune need to be modified occasionally for temperature swings while using the boost target switch?

I've uploaded a base calibration that has reasonable WG Duty - IAT Comp. values to help protect for super cold over boost conditions and to lower WGDC with higher IAT values.

Originally Posted by Jarods7920 Would this table function correctly when using an external gate and a grimspeed solenoid given the correct adjustments are made? Also with this checked, do we still have the ability to do boost by gear?

Boost control with any configuration will work just fine as long as it is mechanically set up properly. I have not tested the boost by gear tables yet, so I don't have an answer for ya there.

Originally Posted by Haltech Damn, i wont be able to play with this until thur, but i def want to modify one of my maps based off psi value. What should the load cap tables be set, to, 5.0 still?

Yes, I would still set the Calc. Load Max. A-B to 5...or whatever value you need to in order to not run into that fueling limitation imposed by the ECU.

Originally Posted by fjames The huge thing for me is it's much, much smoother to drive. Christian or Trey mentioned in passing that this might happen, but didn't offer an explanation. On a pair of 4-5 shifts I got no, and just a smidge of spike, so that's interesting. Just preliminary, but so far it's looking very promising for a DD.

I may have some suggested WGDC setting to help avoid spikes after shifts. Please allow me some more time to experiment or you can IM me with some questions and I will go over what I am thinking with you there.

Originally Posted by fjames Your AFR is pretty erratic and you know your pressure is fucked. I wouldn't be doing anymore logging or aggressive driving until you get that fixed.

Agreed, please don't drive aggressively until your fueling issues are addressed. manelscout4life, I greatly appreciate you allowing me to use your vehicle to verify some things. Tuning the vehicle using a boost reference was pretty easy IMO and I will continue to update our support documentation as I learn more.

Christian.