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tdstuart
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- #437
I put the new maf sensor in so it’s not that haha.Yup just stay under 80% throttle LOL.
MAF and Load are not agreeing once pedal and throttle go above that. I see you added 3-7 lb/min in the WOT area of the transfer.
We know the cylair filter is causing this.
Its either throttle body or something to do with a speed density limit. Hack at it and go down with the MAF values and the injector values?
You didnt have calculated manifold pressure or much of the throttle position voltages in the logs.
So I can really tell you much else beyond what we already knew.
What things do you want me to log? Also as the maf gets really high from high adjustment the injector duty cycle gets shaky
K4fxd
Well-Known Member
Put the MAF settings back to stock. Until we figure out your air load discrepancy, just chasing our tails.
Your cams are the wild card. Are you 100% sure they are installed correctly? I think a code would get triggered if not, but???
IDK
Your cams are the wild card. Are you 100% sure they are installed correctly? I think a code would get triggered if not, but???
IDK
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tdstuart
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Stock vct stock rpm limit didn't have the issue but car might not have been flowing enough air and making enough power to see the issue.
Im not 100% sure about anything but its pretty hard to mess up the cam install and ya I would expect it to throw a code too if it was off. Even one tooth off the timing chain will usually throw a code.
Pistol_91
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Put your cams back to stock next. LOL. Maybe cam angles need to get adjusted across the board.
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tdstuart
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Ill put the entire car back to stock and swap to a gen2 shortblock and replace all the engine components for good measure. Once the car is 100% stock and everything is new we can finally have a baseline for tuning lmao
For drivability I agree but I don't think it would be an issue at wot as the optimum power cam angles are adjusted to what Lund was using and the car is using those cam angles. Only seeing the airflow issue at wot and high airflow.
My guess is the car is seeing something it doesn't like and referring to earlier points on the maf table to calculate what the airflow should be. Thats why no matter how much I change the maf table for the period its at when at wot it isn't actually updating the airflow the car is using to calculate fuel usage (hence no fuel trim changes)
This could also explain how even with the pmas the car was able to do okay since the rest of the maf table was changed for the pmas.
Easy test should be to raise the entire table by 5%.
Pistol_91
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Post a picture of what the 3D SD table looks like for the mapped point used at WOT. What is "Calculated MAP Max" set to right now in the tune, inHg number.
markmurfie
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Its not reaching the stock calculated MAP max. Ive looked into that.
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Pistol_91
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Welp, that answers my question. I wonder if lowering the number would have any effect? I wouldn't think it would though.
markmurfie
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Figure 2 is the simple explaination of the "aircharge Filter"
2A block 220, as much PIDs that will cover most of them going into or in that block as you can.
For throttle I want to see position sensor voltages if possible. I think you may get pedal voltages, but I want throttle position voltages.
markmurfie
Well-Known Member
The TB model is built on a ETC vacuum(14.1 inHg) transition point know as sonic flow and choked flow at a default BARO pressure. When the airflow going through is lower than expected for the MAP, baro gets calculated lower and vise versa.
markmurfie
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