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#1
05-02-2011, 04:37 PM
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So there is a noticeable difference in feel then? I may consider getting them if I keep the 4.6is, (considering selling in the next year depending on upcoming life changes) and probably will go that route with my 93 325is I got back and am getting back together soon enough. (friend that was buying it wrecked it, couldn't afford to fix it and gave it back)
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"When you do things right, people won't be sure you've done anything at all" (Bender, futurama) You make something idiotproof, they'll make a better idiot You think professional is expensive, just wait until you pay for amateur. Never let your sense of morals prevent you from doing what is right. Examine what is said, not who speaks. X5 pics RIP 4.6is..... 2003 4.6is 
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#2
05-02-2011, 05:30 PM
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A noticeable difference in feel between the aftermarket coils and new OE parts, or a noticeable difference in feel between the aftermarket coils and worn original parts?
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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#3
05-03-2011, 01:00 AM
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Quote:
Now all that being said I should have just bought a supercharger for my X and quit wasting all my money on those little extras that didn't really offer a whole lot of HP in return. But you live and learn. Now I just drive my M. 
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_________________________________________________ 2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer 2001 X5 3.0i Sport 335,448 miles & counting... SMG M3 Steering wheel E46 Stainless Racing Headers 4.6is Exhaust Turner Pulleys Afe Intake Brembo drilled rotors PowerFlex Bushings Hualingan 30mm H&R Spacers rear 20mm H&R Spacers front Bavarian Autosport High-Performance Coils Active Autowerke's Performance Software
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#4
05-03-2011, 01:44 AM
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I agree that often coils do not slowly wear out, they fail either open or shorted. But they can start to fail and provide a weak spark, if the resistance is not in spec. I've seen that on older vehicles and not these engines, so I don't know how common it is with these particular coils. These are not simply transformers (as asked above) since the primary is DC, not AC. These are induction coils, and the current in the secondary is induced by the collapse of the field in the primary. If the resistance is not to spec, you will not have the correct current flow, and therefore you will not have sufficient current flow from the secondary, resulting in a weak spark. The resistance can be out of spec simply due to the coils being too hot.
Even if it is a complete coil failure, ie no spark, that failure mode can be intermittent, as ChuckG noted, and it can be temperature dependent. You could check coils by measuring the resistance on older vehicles, not sure about these ones. If you do have an intermittent problem on a single coil, or a weak spark from a failing coil, those are the situations that can be improved by installing new coils, making the vehicle feel less sluggish. I would just suggest that if you have a problem with ignition coils, replacing them with either new aftermarket coils or new OE coils will have the same effect. I see little benefit to aftermarket coils over properly functioning OE coils given the sophistication of the ignition and engine management systems.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue Last edited by JCL; 05-03-2011 at 02:08 AM.
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