Adaptronic Guru's (Please Help) - Manifold Heatsoak % Map

Hi all,

I have watched the video on Adaptronic's website many times regarding the "Manifold Heat Soak %" map but I still don't understand how to adjust this map or when in the tuning process I need to adjust it.

My questions are:

1. How do you set this table up? (My R34 Base map is very basic in comparison to other motors I have seen the base map for in the Adaptronic software. I understand the base map is just there to get you up and running and I'd like to know everyone's train of thoughts on setting this table up. I'll attach a pic below of how mine is set in the base map)

2. When do you need to touch this table? Can you give me examples on how you tune this and certain scenarios where this might need to be adjusted.

3. Do you even use this temp correction mode or do you just revert back to the separate Coolant/Air temp correction maps?

Thanks for your time to who ever replies.

Cheers,

Cameron.

Hi Cameron, sorry for the slow reply. While at this point I haven't dealt with the Adaptronic personally, we will be very shortly in our FD RX7. This table appears to be a charge temp estimate table which is pretty common in a lot of ECUs these days. The idea behind this table is that for the ECU to be able to provide accurate fuelling it needs to know what the charge temp is of the air entering the cylinder. We can't directly measure this though so it needs to be estimated.

The way this works is that we can assume that at low rpm and low load the air speed through the intake manifold and cylinder head is relatively slow which means it has lots of time to pick up heat from these areas. This in turn means that the actual charge temp under these conditions is going to be influenced heavily by the coolant temp which is a better indicator of the cylinder head temp than the IAT sensor. Conversely at high rpm and load the airspeed is very high giving little chance for heat transfer top the air charge. Under these conditions the charge temp is going to be very close to that of the IAT sensor.

So in basic terms at low rpm/load we bias heavily towards the ECT sensor and at high load/rpm we bias towards the IAT sensor reading. Using this table sensibly can help reduce fuelling inconsistencies brought about by heat soak if you're only using the IAT sensor alone.

While it's performed on a Link G4+ ECU, here's a webinar showing how the system works and a few tips on adjusting it - https://www.hpacademy.com/previous-webinars/075-charge-temperature-compensation-link-g4/