Tuning Flashpro for altitude deltas
I've been lurking in this forum; interested in going with Flashpro on a stock '06. Some recent posts have mentioned tuning to the altitude at which the car is most often driven and a statement that Honda did not bother tuning for WOT because they want the car to run smoothly as elevation increases.
Is the calibration of the MAP revised with Flashpro tuning? I would expect that the MAP would adjust for elevation changes. Since I live near sea level and often go canyon bombing in mountains ranging from 4000 to 6000 ft high, I would hate to have my car run like crap once I started up a hill. Is this really a concern? Were previous posts picking at nits while reviewing their data logs? Would power loss percent at higher elevations be same as loss with a stock tune?
TIA for your comments.
Is the calibration of the MAP revised with Flashpro tuning? I would expect that the MAP would adjust for elevation changes. Since I live near sea level and often go canyon bombing in mountains ranging from 4000 to 6000 ft high, I would hate to have my car run like crap once I started up a hill. Is this really a concern? Were previous posts picking at nits while reviewing their data logs? Would power loss percent at higher elevations be same as loss with a stock tune?
TIA for your comments.
I think you missed the point about Honda's factory tune. It isn't that the tye didn't "bother" to tune at WOT, it's that they couldn't tune at WOT without knowing what specific altitude the car was going to be driven at. Since you will drive at various altitudes, then your tune should also be based on part throttle. If you want to do some WOT tuning for the lowest altitude, then that would be fine, but that would take a very customized tune, with maps that look like this:
Forgot to answer your question about the MAP.
The ECU does rely on the MAP to deal with altitude changes, but that doesn't magically provide compensation for the Throttle plate. For example, at sea level, 800 mBAR never happens with the throttle plate fully open, but at very high altitude, it might require the throttle plate to be fully open, which would give a very different "air curve". The resulting fuel trims and / or AFR's would be very different. In open loop at high altitude, you will have lean areas in RPM spots that might be rich at low altitude.
The ECU does rely on the MAP to deal with altitude changes, but that doesn't magically provide compensation for the Throttle plate. For example, at sea level, 800 mBAR never happens with the throttle plate fully open, but at very high altitude, it might require the throttle plate to be fully open, which would give a very different "air curve". The resulting fuel trims and / or AFR's would be very different. In open loop at high altitude, you will have lean areas in RPM spots that might be rich at low altitude.
Thank you for your detailed replies.
Forgot to answer your question about the MAP.
The ECU does rely on the MAP to deal with altitude changes, but that doesn't magically provide compensation for the Throttle plate. For example, at sea level, 800 mBAR never happens with the throttle plate fully open, but at very high altitude, it might require the throttle plate to be fully open, which would give a very different "air curve". The resulting fuel trims and / or AFR's would be very different. In open loop at high altitude, you will have lean areas in RPM spots that might be rich at low altitude.
The ECU does rely on the MAP to deal with altitude changes, but that doesn't magically provide compensation for the Throttle plate. For example, at sea level, 800 mBAR never happens with the throttle plate fully open, but at very high altitude, it might require the throttle plate to be fully open, which would give a very different "air curve". The resulting fuel trims and / or AFR's would be very different. In open loop at high altitude, you will have lean areas in RPM spots that might be rich at low altitude.
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