Here is a printout of my dyno runs with the APR chip in stock and chipped mode.
02-06-2002, 02:02 AM
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Here is a printout of my dyno runs with the APR chip in stock and chipped mode.
If anyone is interested.
<img src="http://pictureposter.audiworld.com/14809/dynostock.jpg">
<img src="http://pictureposter.audiworld.com/14809/dynochip.jpg">
<img src="http://pictureposter.audiworld.com/14809/dynostock.jpg">
<img src="http://pictureposter.audiworld.com/14809/dynochip.jpg">
02-06-2002, 03:14 AM
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Spikes?
The chipped run shows a big dip at 4000 rpm and a smaller one at 5,500 rpm. Also many smaller peaks and dips. Any explanation? Looks like stock peak torque is 165 & chipped it's 220, but at a peak. The increase in torque with the chip is 34%. Advertised increase for most chips id 47% (250 ft-lbs to 368 ft-lbs). This would be close for both rear wheel (with whatever loss) and fywheel runs.
Here is my interpretation, for what it's worth. The all important area under the torque curve, which is determines acceleration, is not proportional to the peak torgue. That is due to the uneveness of the chipped curve and the flatter stock curve. This would be true of all chips, which all peak the curve, but here there are pronounced dips, which would decrease the area even more.
Point is, a chipped engine makes more power, yes, but not as much usefull power as would be inferred by just the peak readings alone. Interesting. Thanks for the data.
Here is my interpretation, for what it's worth. The all important area under the torque curve, which is determines acceleration, is not proportional to the peak torgue. That is due to the uneveness of the chipped curve and the flatter stock curve. This would be true of all chips, which all peak the curve, but here there are pronounced dips, which would decrease the area even more.
Point is, a chipped engine makes more power, yes, but not as much usefull power as would be inferred by just the peak readings alone. Interesting. Thanks for the data.
