Originally posted by nando
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AEM Dyno-shaft permanent inline driveshaft dynamometer
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2006 GMC Sierra 2500HD 4WD LBZ/Allison
2002 BMW M3 Alpinweiß/Black
1999 323i GTS2 Alpinweiß
1995 M3 Dakargelb/Black - S50B32/S6S420G/3.91
1990 325is Brilliantrot/Tan
1989 M3 Alpinweiß/Black
Hers: 1996 Porsche 911 Turbo Black/Black
Hers: 1988 325iX Coupe Diamantschwartz/Black 5spd
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I've actually done it, you can measure a significant difference even at 25mph. You can see it from secondary factors to, for example, the car will go leaner because there is more air. you don't need to know the exact flow rate if you know what to look for. :)
if you only changed the intake, and needed to add fuel to reach the same AFR (because of cooler temps), or can see that MAP increased significantly (less restriction), then you can know you're making more power. Don't need a dyno for that, you just can't quantify the exact difference without verification (I've done that too). But even then, you can get pretty close with good assumptions and math (10% more MAP, about 10% more air& fuel, about 10% more power, minus efficiency losses).
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