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This is a discussion on Utec within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; I brought my WRX up from Texas (sea level) to Utah. It has quite a few mods and im curious ...

  1. #1
    Registered User bnels2348's Avatar
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    Utec

    I brought my WRX up from Texas (sea level) to Utah. It has quite a few mods and im curious if I should retune it for the higher elevation. (AFR and what not)
    Also what is a good range for the Timing #1 on my dashboard in the UTEC? right now its running about 12.7 degrees before TDC.

    Thanks for helping me out

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    Registered User Thug Nasty's Avatar
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    I don't know the answer to any of those. But I would try posting over at Nasioc. There are a bunch of very knowledgeable people with UTEC godlike knowledge.
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    Registered User ktmrider's Avatar
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    A general rule of thumb on timing vs altitude is +2% for every 1000ft gain.
    I have used +10% for timing on my previous non-OBDII NA vehicles here in ABQ ( 5200ft ).
    On AF ratio, 14.7:1 is still the ideal target. The onboard O2 sensor and ECU will maintain this regardless of altitude. I don't recommend playing too much with AF, especially if you travel to lower altitude locations on a regular basis.
    Hopefully you have the selector switch with your UTEC, as with the AF if you travel to lower altitude you can cause some problems. Make a tune for your local area and have a backup for travel.
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    altitude doesn't affect turbo charged cars as much as NA cars since turbo charged cars are running an altered atmosphere anyways. Boost control will be affect more than anything. I be more worried about the difference in fuel quality than altitude.
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    Registered User ktmrider's Avatar
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    Testes is right about the fuel quality. Higher altitude reduces detonation potential which is why we rarely find octane rating over 91 at "normal" filling stations. It is also the reason you can usually advance timing w/o having the ECU pull it out due to knock.
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    Quote Originally Posted by testes1010 View Post
    altitude doesn't affect turbo charged cars as much as NA cars since turbo charged cars are running an altered atmosphere anyways. Boost control will be affect more than anything. I be more worried about the difference in fuel quality than altitude.
    The words of a master. I was having problems with my target boost after the weather got colder. I was over boosting and my KC was going nuts I changed the Waste Gate temprature compenstation and docked my WGDC durring spool and bam! I was hitting target boost once again. I thought I would have troubles with the KC still but every thing was strait. 4.5 across the board.

    I <3 enginuity.

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    Quote Originally Posted by ktmrider View Post
    Testes is right about the fuel quality. Higher altitude reduces detonation potential which is why we rarely find octane rating over 91 at "normal" filling stations. It is also the reason you can usually advance timing w/o having the ECU pull it out due to knock.
    That is interesting You would think it would be opposite but I guess with less/thinner air, you don't have to worry about lean mixtures.

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