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  1. W

    How we went from 340WHP to 455whp

    Good gains. Thanks for the step-by-step increase dyno graphs. PLEASE stop using the outdated STD correction factor. SAE replaced it almost 30 years ago. Just because it reads higher does not mean it's right.
  2. W

    Are piggyback tunes 100% undetectable?

    The stock ECU will be correcting long and short term fuel trims to keep a/f ratio at the target point, and with additional boost/airflow, these trims will go up. Keeping those trims within the limits to not set a code is part of what the manufacturers testing must verify. I had a LAP3 Uncle...
  3. W

    Are piggyback tunes 100% undetectable?

    The piggybacks LIE to the ECU about what the sensors are reporting, so therefore as far as the ECU knows, everything is working properly. That's the point of limiting how much manipulation can be done...to keep the car from going outside of accepted norms and throwing codes.
  4. W

    Are piggyback tunes 100% undetectable?

    In my example, I picked one RPM in time, so how did I say it was at a later RPM? The only thing that could be seen in a snapshot would be the wastegate dutycycle. But who is to say what the wastegate dutycycle is supposed to be to generate a specific level of boost? This is depending on...
  5. W

    Are piggyback tunes 100% undetectable?

    No, it won't. Let's pick one spot for a second. Say you are WOT at 4000rpm. The car has a target of 7psi of boost. If the piggyback were not installed, the MAP/TIP sensors would report actual boost (let's put a voltage on it and say that's 3.0V) and the ECU would adjust the wastegate solenoid...
  6. W

    Are piggyback tunes 100% undetectable?

    The way that the piggybacks, like a LAP3 Uncle Chip, work, is by giving lower MAP data to the ECU, which causes the ECU to increase boost until this skewed down value comes up to the target. As such, any recordings in the ECU would show normal MAP values.
  7. W

    RaceChip GTS Black Initial Review

    Nice write up and review. Now it's time to get it on a dyno to see the differences and log the boost, timing, knock, ECT, IAT and other goodies to see what is really going on. And just for technical accuracy, the "A" connection is to the TIP (throttle inlet pressure) sensor and the "B"...
  8. W

    Clarification on "tune" types

    It's your list, but I'll throw a little bit of fuel on the fire here. I think that saying that a sensor manipulator has greater risks and less than optimal tuning results is a bit rash. Just because there are more things a "tuner" can tune when doing a full ECU tune or those other options you...
  9. W

    Who's experienced issues with the Lap 3 Uncle Chip?

    These cars run full time wideband O2 feedback and are set to run fairly rich stock. WOT with stock boost on my Optima 2.0T was in the mid 10's for AFR. These boxes plug into the MAP and TIP sensors and skew the voltage going back to the ECU, so it thinks less boost is being produced than there...
  10. W

    LAP3 USA Kia Stinger Tuning

    So someone has stacked the LAP3 boxes, asking for double the change amount? I would expect that to have issues. The LAP3 connects to the MAP and TIP sensors only.
  11. W

    LAP3 Uncle Chip review

    My guess is that increased boost, timing and the lower octane fuel I was running (91 is the highest we get here, and the LAP3 was set on the 93 octane setting) was causing it. I've had these in two of my cars and neither has had any issues. Because it plugs into the MAP and TIP sensors, I'd...
  12. W

    LAP3 Uncle Chip review

    I meant the manufacturer of the piggy back box (LAP3).
  13. W

    LAP3 Uncle Chip review

    The Stinger might do more than the Optima in the way of checks, but if the mfg is selling them as tested for the Stinger without issues, I'd have to believe (based on my own experience with the Optima) that they will work as advertised.
  14. W

    LAP3 Uncle Chip review

    I believe that's the goal when it comes to tuning, yes. In stock form, these cars run a bit rich (conservative) and compensate for airflow changes by monitoring A/F ratio in real time and adjust on the fly, within their allowable range. This is how the LAP3 Uncle Chip gets away with turning up...
  15. W

    LAP3 Uncle Chip review

    If a sensor somewhere were reporting an abnormal value, then these boxes wouldn't be working in any of the cars. I've had this in my Optima for 2 years. It doesn't throw codes, just works as intended.
  16. W

    LAP3 Uncle Chip review

    OK, agreed. But if the sensor data that the ECU is recording is what is changed, how is that recording going to show anything outside of normal parameters?
  17. W

    LAP3 Uncle Chip review

    A piggy back device plugs in line with sensors and skews the data (voltages) going back to the ECU. The ECU sees these adjusted signals and then changes the way it controls the engine in response. In the case of the LAP3 Uncle Chip, once it achieves a certain voltage (boost) level, it starts...
  18. W

    LAP3 Uncle Chip review

    If it did, that would negate the changes. That's the point of the box.
  19. W

    LAP3 Uncle Chip review

    This ASSUMES that the boost signals are being manipulated in low throttle setting areas. That is generally not the case. I can't comment exactly to LAP3's map, but the bulk of the performance increase is at higher throttle settings, where boost is already supposed to be high and will already...
  20. W

    LAP3 Uncle Chip review

    I leave the catch cans on when I take my car in for service. The mechanic showed the service writer the first time it came in, and I was called back to tell them what it was. I explained how it worked and they all agreed it was a good thing. Never an issue since.


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