BavAuto highpo coils vs COP

[Nick_S]

Ok so basically I'm an idiot. I placed an order for some other stuff with BavAuto and saw their high performance ignition coils on sale. Hastily I placed the order only to realize the next day that it very explicitly states it's not a COP conversion. Yea I'm a dumbass. Anyways.

I can send them back and pick up the actual COP kit from HQ that is actually a few bucks cheaper. Downside is I have to pay to ship the Bav stuff back and wait for the money to get redeposited. I'm replacing OE coils and the wires are OE aswell. Plugs are new Bosch. Is there an actual noticable difference going with the COP kit vs. the high performance coils with wires? If the difference is negligible I'll just keep the BavAuto coils and use those. Obviously, aesthetically the COP looks better I know that but if it's not worth the hassle of sending back and re-ordering I'll just keep these.

[bmwm42]

get to cop kit

[KenC]

I never noticed a difference. I'd just keep the BavAuto stuff.

[Ryann]

Heat and vibration are two of the top components of electronics failure. Why bolt your coils to a cylinder head?

[Nick_S]

Thanks for the replies guys. I went ahead and installed the coils I bought and I can't really see how the COP could have that drastic of a difference over these, not saying it may not be better. Going from 20+ year old OE units with lots of miles to these. My idle smoothed out, a stumble off the line is gone and seems more responsive. I'm happy with them, I just don't want to buy new wires, they cost as much as the damn coil packs!

[immajackuup]

Heat and vibration are two of the top components of electronics failure. Why bolt your coils to a cylinder head?

x2 and it will save you the head ache on rewiring.

[grippymonkey]

Heat and vibration are two of the top components of electronics failure. Why bolt your coils to a cylinder head?

considering they use this same style setup on 4g63 Mivec turbo engines that produce way more power and heat than a M42 will... and people use the same coil system on 4G63's that push 1000hp

I don't really see an issue running it on our little 1.8 poop shooter

btw a valve cover isn't exactly a huge source of engine related heat

[bmwm42]

x2 i dont really see the huge issue with heat or vibration ive been running mine for over a year, cables are stupid expensive and that and the coils make it look ugly, this could be a purist issue though with keeping things the way they are, next thing will be is why did we get rid of the distributer electronics are prone to fail.

[Leo_328i]

Heat and vibration are two of the top components of electronics failure. Why bolt your coils to a cylinder head?

That is a really awesome observation - funny how the BMW 6 cylinder engines of this era (M5X series) always have their coils going bad after a while as they are directly on top of the cylinder head whilst the stock M42 ones never seem to go bad.

[Ryann]

^I have changed failed COP style coils on other low milage vehicles as well. Volvo S60, Mazda Protoge, and a 4 cyl. Pontiac something-or-other that I can remember off hand.

I completely agree with the wire argument Phil, $100+ for 4 wires is fucking retarded. I'm only biased against COP's based on my experiences with them failing, and engine heat/vibration are a couple of things I can think of that would make them more prone to failure. I don't mean failure like they explode two weeks after you put them on or even a year, I mean after 50-100K miles of service.

[bmwm42]

exactly dude you arent going to notice huge hp gains with a cop kit and they arent going to last forever either. one thing though ryan please explain to me this vibration stuff on an m42 and heat on other engine v8s etc that arent as balanced like a straight 6 or 4 in not sure how vibration can be a factor? just my .02

[Ryann]

All engines vibrate to some degree and vibration is tough on wiring and connectors.

It's just a theory to explain why I've noticed a higher rate of failure with COP setups vs. other coil setups no matter the engine or ignition system. It could be total bullshit, idk.