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Thread: 2015 FRPP will NOT enter PE.

  1. #21
    Senior Tuner
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    I would have expected to see more than 32 LB/min peak in a pro charged coyote. another 1000RPMS and youd be at the max of your MAF curve. I think your SD changes are causing you to tune your MAF curve wrong. With your MAF that far off your torque values and load values would be too. That or you have your MAF in a very small pipe.

    MAP max delta above BP, you are over twice what you really see. calculated MAP max you are about a third too high. MAX load is too high. Load at WOT is stock(about half of max load). These things can cause your MAF value to be wrong when the cylair filter is enabled.

    Then you have OP enrichment required disabled under your VCT. This basically makes fuel enrichment based on pedal position and desired torque for load, which you are probably around half or less of what you should be from the MAF values you are seeing.

    I'm surprised lowering your max torque values did anything at all.
    Last edited by murfie; 08-12-2017 at 05:37 PM.

  2. #22
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    I'm with Murfie here. At 3500-ish rpm you're at u=102-ish on the MAF. The 32lb/min is probably ballpark, but you're close to exceeding the MAF limit. Minimum I'd recommend double checking your injector modeling then look into that MAF. May be that the MAF is in just too small a section of piping.
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  3. #23
    Advanced Tuner 96gt4.6's Avatar
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    I did have a question, I see in an earlier reply that some were having issues of the commanded lambda being different from the actual measured lambda. I'm having the same concern, however the fuel trims are getting the actual lambda to where it is being commanded in the tune, although the "commanded lambda" in the scanner shows differently. I'm assuming this is a glitch?
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  4. #24
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    100% what murfie said, had the exact same issue with a 2016 Procharger stage 2 car. I was chasing my tail for like 3 days straight then put everything back to base and dialed in the maf and that took care of the car not going into PE. depending on your pulley setup you should be flowing between 60-80 lb/min through the maf around redline (remember prochargers have pretty linear power curves). Everything he listed has to be spot on, meaning within a small margin of error.
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  5. #25
    Senior Tuner metroplex's Avatar
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    Quote Originally Posted by 96gt4.6 View Post
    I did have a question, I see in an earlier reply that some were having issues of the commanded lambda being different from the actual measured lambda. I'm having the same concern, however the fuel trims are getting the actual lambda to where it is being commanded in the tune, although the "commanded lambda" in the scanner shows differently. I'm assuming this is a glitch?
    I have the same problem... Commanded lambda is 1.2-1.3 and actual is 0.82 (what I desired/wanted).