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The Terminator
Engine/Tuning
Does weather affect the tune?
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<blockquote data-quote="adrenaline rush" data-source="post: 9705410" data-attributes="member: 15424"><p>The weather technically doesn't affect the tune. However, the ambient conditions will affect the power output. The calibration is the calibration. It's coded into the RAM area of the ECU. When the MAF sensor sends the airflow data, the ecu will compensate for the correct amount of fuel needed. The algorithim is hardcoded, but the A/F and spark is calibrateable. This is what your tuner changed. </p><p> </p><p>When OE vehicles are SAE certified, it is done in an environmental chamber. The conditions are held at a constant. Also each rpm point is held until steady state before the SAE witness confirms that the HP/TQ is certified. This is all done on an engine dyno.</p><p></p><p>That being said chasis dynos are good to get a ball park figure of your HP/TQ. However, that's all that it is, a ball park figure. There are way too many variables. If your tuner dynos your car at 6 in the morning on monday. It won't be the same number if he dynoed it at 6 on tuesday. </p><p></p><p></p><p>If you had a good tuner, he would of been aware of all of these variables. Therefore, he would of tuned your vehicle via A/F and spark to not run on the ragged edge. Also, good tuners will calibrate in a consistent manner. Meaning that if you 500hp today, you'll make +/- 15% any other time.</p></blockquote><p></p>
[QUOTE="adrenaline rush, post: 9705410, member: 15424"] The weather technically doesn't affect the tune. However, the ambient conditions will affect the power output. The calibration is the calibration. It's coded into the RAM area of the ECU. When the MAF sensor sends the airflow data, the ecu will compensate for the correct amount of fuel needed. The algorithim is hardcoded, but the A/F and spark is calibrateable. This is what your tuner changed. When OE vehicles are SAE certified, it is done in an environmental chamber. The conditions are held at a constant. Also each rpm point is held until steady state before the SAE witness confirms that the HP/TQ is certified. This is all done on an engine dyno. That being said chasis dynos are good to get a ball park figure of your HP/TQ. However, that's all that it is, a ball park figure. There are way too many variables. If your tuner dynos your car at 6 in the morning on monday. It won't be the same number if he dynoed it at 6 on tuesday. If you had a good tuner, he would of been aware of all of these variables. Therefore, he would of tuned your vehicle via A/F and spark to not run on the ragged edge. Also, good tuners will calibrate in a consistent manner. Meaning that if you 500hp today, you'll make +/- 15% any other time. [/QUOTE]
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Does weather affect the tune?
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