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Mt92

2013 YZ450F at high altitude

12 posts in this topic

I am getting ready to go trail riding in Colorado at 700-10000 ft elevation. My bike has a vertex ignition on it and I was curious if it would auto adjust for the thin air? I have the stock ignition also if that would be better.

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You mean Vortex

 

  • Pre Programmed with 10 Performance Fuel & Ignition maps - all the work is done for you!
  • Instant Plug in Performance (replaces standard ECU with no mods to wiring required)
  • Fuel Trim Switches adjust fuel mapping by +12.5% to -10% in Lo , Mid and Hi throttle bands
  • Adjustments require only a screwdriver and integrated switches provide visual feedback.

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The OEM system adjusts for altitude.  The barometric pressure sensor on the YZ system (not present on some others) can actually trim the fuel on the fly.  Other bikes make an adjustment for it. but without the baro sensor, they can only take a reading during start up using the manifold air pressure sensor. 

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Anyone out there have a gytr tuner map for high elevation? Yamaha has maps for different track surfaces but nothing for ambient /altitude. I'm looking for a base map for 6-7000ft and 0*C/32 f...2016 450f.

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So maybe it would be best to go back to the stock box for the trip. This is a ex Paul Whibley bike and I am not sure what all was changed. I need to look for the barometric pressure sensor and make sure it is still there.

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The Vortex should retain all the functionality of the original system, probably except for being adjustable by the GYT-R tuner, and having switchable maps.  The Baro sensor is on the TB with the MAP (manifold air pressure) last I saw one.

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As I understand it, the ECU will reset it's 'base line' (middle point?) for the map you are on, one the bike has gotten up to temp, restarted  with zero throttle movement, for 3 minutes.

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As I understand it, the ECU will reset it's 'base line' (middle point?) for the map you are on, one the bike has gotten up to temp, restarted  with zero throttle movement, for 3 minutes.

 That applies to the Honda system, which has no discreet baro sensor, and uses info from the MAP as described to perform the calculation.  (a "better" idea?)  The Yamaha set up has a discreet sensor for barometric pressure separate from the MAP sensor, and so is not limited in that way.  It uses real-time baro info to adjust the base map for altitude.

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 That applies to the Honda system, which has no discreet baro sensor, and uses info from the MAP as described to perform the calculation.  (a "better" idea?)  The Yamaha set up has a discreet sensor for barometric pressure separate from the MAP sensor, and so is not limited in that way.  It uses real-time baro info to adjust the base map for altitude.

 

Love the info!

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