FYI: Altitude Tuning Differences - Page 2 - Hyundai Genesis Forum
Technical Tuning of EMS/EFI This section is reserved for discussion about the electronic tuning specifics for the Genesis vehicles.

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post #11 of 15 Old 04-28-2009, 11:57 AM Thread Starter
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FYI also, I posted this with a direct reference to the stock system. With stock injectors and turbo altitude comes into a significant amount of play. The stock injectors and turbo are pretty well maxed from the factory so when adjusting the boost/modifying other parts of the car careful consideration should be taken with respect to your AFRs changing with altitude. I'd imagine that the stock ecu can mitigate some of the effects to a certian degree but the amount that it can adjust for atm condition changes is yet to be determined.

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post #12 of 15 Old 06-06-2009, 04:30 PM
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ok I hate resurrecting dead threads but what MSU is saying goes against what i understand about turbo engines. I agree with his OP in regards to N/A engines.
My understanding of turbos says that the boost sensor reads the pressure inside the intake, (maybe thru the vacuum system, i'm not real clear on that) and regulates, using the waste gate, the boost at that point? I thought that was one of the advantages of boosted engines no matter what the outside atm pressure was the turbo maintained the correct pressure inside the engine. This is of course as long as the turbo doesn't reach it's "surge" line.

What am I missing?
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post #13 of 15 Old 06-06-2009, 09:02 PM Thread Starter
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You are right to state that the engine will compensate for it, in STOCK FORM! This is the issue that I was trying to highlight for people BEFORE they had an issue due to not knowing. A factory programmed, stock turbo car will attempt to compensate for the pressure difference at different elevations above sea level to a reasonable and pre-programmed limit. That being said, the instant that stock programming can no longer be used, is altered, or is not fully able to function (i.e. adding a MBC) it is imperative that you understand how different variables effect your car. I'm just trying to help people understand one parameter of the equation that goes into turbo selection, fuel mapping, etc. The end information that is needed to be taken from all this is that different turbos will behave differently due to variations in sea level (their efficiency will be different). Like I said, there are A LOT of different variables to be understood here and I surely don't claim to understand them all, just trying to lend a helping hand.

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post #14 of 15 Old 06-07-2009, 05:40 PM
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ok i think i see what you were saying, thanks for the clarification
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post #15 of 15 Old 04-25-2011, 05:12 PM
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In short, if you are constantly driving between high and low elevations, use ecu controlled boost. Also helps with drastic temperature changes.
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