Tuning 03 04 Cobra

Putting a thread out there to get some info flowing on tuning these cars. Now that EECV Support is starting to roll out , I suspect that a lot of the SVT guys may shift from PRP to HPT.
Since there's limited information out there on tuning these cars compared to their LS counterparts I'm presenting what I have found scouring the internet over the past month. This is not a firmed and inclusive how-to, but the goal is to get it there with revisions based on feedback.

Note- that I have not tuned my own car (or anyone else?s car) using this method but hope to do so next summer.

Tuning the MAF

You are tuning this table: Airflow > General > MAF Calibration

The setup:

Airflow > General > Disable ACDC Switch/Anticipation Logic/Cylair Filter. This will force Load with MAF Failed to disable
Airflow > General > Disable MAP. Not sure if this sensor impacts calculations on early Fords but I would disable anyway
Fuel > Cutoff,DFCO > Deceleration Fuel Cutoff > Set all of the parameters to turn off DFCO
Fuel > Oxygen Sensor > Set O2 readiness to highest value to turn off O2s. Can turn off any other parameters you see impact closed loop
Fuel > TPS Thresh. Set this table to 1 that way you are always in OL
Fuel > OL/Base > Fuel Base. Set this to your desired WOT Lambda. I will be using 0.80 to be on the safe side
Spark > Advance > Borderline Knock. Reduce the by 5-6 across the border to be on the safe side while tuning fueling

If at WOT you are greater than 1.28 Load, then Airflow > SD > Peak Load need to be increased

Tuning Timing

You are tuning this table: Spark > Advance > Borderline Knock

This is straight forward you can do this on the dyno to be perfect or on the street to be close.

Tuning LWMF

Instead of using live VE data, these cars used fixed table data points to proactively calculate fueling to supplement the reactive calculations of the MAF sensor. It is important to tune this table as it impacts drivability. To tune this you need to leave it in closed loop and populate the data points the following table

Airflow > General > MAF Failure Load (IMRC Open)

At least in my experience so far I haven't had the need to tune the MAF table in closed loop as I have been doing everything in open loop. I haven't had to disable the ACDC anticipation switch nor the map sensor. I don't know if this affects data logging accuracy but I haven't had an issue yet. My only question right now is tuning my borderline knock table as it is hard trying to data log what my spark should be as I cant find a load sensor for my car in VCM scanner. So I want to know how people are finding load. Is it based on the MAF failure load (IMRC open) setting?

I don't have a ton to offer in this right now as I am now just getting into tuning, but hopefully we get some good info in here! Excited to see HPT giving us 03-04 guys another option for tuning!

Quote:

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Originally Posted by Adammm57

At least in my experience so far I haven't had the need to tune the MAF table in closed loop as I have been doing everything in open loop. I haven't had to disable the ACDC anticipation switch nor the map sensor. I don't know if this affects data logging accuracy but I haven't had an issue yet. My only question right now is tuning my borderline knock table as it is hard trying to data log what my spark should be as I cant find a load sensor for my car in VCM scanner. So I want to know how people are finding load. Is it based on the MAF failure load (IMRC open) setting?

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Log Air Load

Attachment 156405

How does this tune look?
2003 Cobra 2.8 keen Bell 22psi

after datalog, i seen my peak load at WOT go from 1.28 all the way to 1.75 @ 5500+ would i just add the recorded data directly to the tables or would i average them out for it to be correct?

TIA

Quote:

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Originally Posted by 03Cobra1995

after datalog, i seen my peak load at WOT go from 1.28 all the way to 1.75 @ 5500+ would i just add the recorded data directly to the tables or would i average them out for it to be correct?

TIA

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If you mean for LWMF, then yes, just make a histogram and plot the actuals... looked at the log you posted, seems like your MAF curve is off and your hitting 22% STFT which is causing cutoff

okay, ill look into it this weekend, thanks again so i just wanna make sure im on the same page when fuel<TPS Thresh that parameter units are lambda? or something else?. when its set to 1.00 or zeroed out to stay in O/L thats in lambda or afr 14.86?

Fuel > TPS Thresh. is not in lambda. It's the throttle position you want the car to go into OL. By setting this to 1, your are saying if TP is greater than 1, enable OL. This is done for tuning your MAF curve. Fuel > OL/Base > Fuel Base is where you set your lambda for OL. Yours is set to 0.77 which is 11.3 AFR on pump.

Your issue could also be your boost reference line since it looks like your running a return system. Right now your fuel pressure stays at about 40 psi through your whole pull. I would first increase your MAF curve see if that changes your wideband AFR during the pull. If not, then look into your fuel system.