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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki |
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#1
12-30-2012, 09:29 AM
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e39 1997 "g-force" performance chips?
Any advice on increasing performance with these type chips?
Do any work without damaging engine? Looking for better mileage and/or horsepower. Any info would be appreciated... Thank you. 
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#2
12-30-2012, 11:24 AM
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Quote:
Most of these "chips" are complete garbage http://forums.bimmerforums.com/forum...07&postcount=6 http://www.bimmerfest.com/forums/sho...51&postcount=8 Better mileage -> higher octane fuel More hp -> VF supercharger or M5
__________________
 my wagons faster than yours 
Last edited by the540wgn; 12-30-2012 at 11:26 AM.
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#3
12-30-2012, 05:09 PM
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That's exactly right, it is a resistor. These types of things are quite popular for the BMW motorcycle crowd since the older oilheads tend to run lean from the factory and surge. They're installed not as a power booster but to mitigate the surging condition.
The website even acknowledges they are installed using two wires to the IAT (intake air temp) sensor. It's a NTC (negative temperature coefficient) resistor that increases in resistance as the air gets cooler. By installing an additional resistance inline to the sensor, you make the engine think it's cooler outside and it runs richer. With O2 sensors it does absolutely nothing since the ECU will adapt. And our engines don't run overly lean anyways.
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