2002 Mustang GT with Vortech supercharger Lean Tip In

[yaqoubalmounes]

I am tuning a 2002 muatng gt with vortech supercharger 8-9 psi non-intercooled. It has dark blue top injectors and 90mm Lightning MAF. it idle and drives well. except for tip in WOT. It has lean spike when pressing the throttle to WOT. It was getting to 1.5 lambda in tip in when transient into WOT. After making some adjustments to manifold volume, maf failure load and transient tables it get a little better with 1.17 lambda in tip in then the afr get to the commanded lambda. I could not find the correct data for the dark blue top injectors so I copied the Cobra data as I think it is the closest injectors in flow rate to what I have and make some changes to flow rate low and high. Any idea how to fix the lean tip in spike?
Lean tip in.hpt I cannot upload a scanner file because I am using Forscan to data log.mustang out of car.hpt

[GHuggins]

Something to try - transient - evap rate - copy 37 column - paste into last right column and then interpolate between the two. Keep in mind that "stomping" happens at idle and lower rpms too. Looks like a lot of your load and even failed tables aren't necessarily showing the loads that you may be seeing at lower rpms...

[yaqoubalmounes]

Something to try - transient - evap rate - copy 37 column - paste into last right column and then interpolate between the two. Keep in mind that "stomping" happens at idle and lower rpms too. Looks like a lot of your load and even failed tables aren't necessarily showing the loads that you may be seeing at lower rpms...

Thank you. I will give that a try. Just trying to understand, so the load and failed table are not correct? I increased the load just to see if that will correct the lean spike. Do you recommend to keep as the stock file or adjusting them?
Is stomp caused by the incorrect load and failed table or it may happen when adjusting the evap rate. Sorry for too much questions. I am trying to understand your valuable advice.

[GHuggins]

What I meant by it was that you might also want to increase the values for airflow in the higher load lower rpm areas like you have for the higher rpm and load areas. Even your peak load and map tables were pretty low if memory is serving me correctly for these areas.

[yaqoubalmounes]

What I meant by it was that you might also want to increase the values for airflow in the higher load lower rpm areas like you have for the higher rpm and load areas. Even your peak load and map tables were pretty low if memory is serving me correctly for these areas.

Got it. Thank you for your help. I copied and pasted in the evap rate table and it got much better. I think I have a wrong injectors data. I will try another data and will see is it get better.

[RobCat030]

I don't know much about this strategy but I'm curious about how much it cares about the Speed Density. This is what the calculated VE looks like in MAF rate (lbs/min), section highlighted in yellow being values possibly not seen by the model because it's a boosted MAP value. Your failed Airmass Table would definitely need adjustment to be correct, and the slope values may need to be raised/corrected. Also curious if disabling Cylair Anticipation makes any difference. I don't see the Load w/failed MAF being a problem unless your lean spike is before 2000RPM. Some people like to raise the Cylair WOT Multiplier to like 1.9 or 2 as well.

Screenshot 2022-01-30 003746.png

Then you have this "Percent Load" switch which appears to change how the PCM finds itself along the Y axis of the Base Fuel Table (and probably any load dependent table, so Borderline Spark might be at risk too), set to "Speed Density." Could mean that it's limiting the load value sent to the fuel table (and limiting actual load), both of which could cause a lean spike. I would think with boost you would want to rely on the MAF as much as possible.

[GHuggins]

^^^ You went into much more detail, but yes these were the points I was trying to make with the "general" other load tables needs to be adjusted statement. Most strategies will use speed density for transient fueling or in other words rapid rpm changes more than 75ish rpms...

[dm63031]

Being a new tuner and trying to learn, I am glad he went into more detail!