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  #21  
Old 03-06-2019, 01:10 PM
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Hmmm, just thought about what I wrote - second hand! Now I have to ask Brian why BMW has them... maybe they couldn’t get them seated either! Shoot..


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  #22  
Old 03-06-2019, 06:13 PM
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I have no personal experience but there are mixed reviews about the worth, benefit and longevity of Bavauto coils.
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  #23  
Old 03-06-2019, 06:22 PM
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Quote:
Originally Posted by StephenVA View Post
(Un)fortunately, in a previous life I worked for a very large international company (conglomerate) that built everyone's ign coils, among a lot of other engine management, brake, fuel, etc, etc parts. Most of the HIPO coils were nothing more than a different epoxy/silicone color mix. All of the windings were were either improved in the design phase or were same as the OE build ones in a blue/red/yellow color pattern with a decal. Same assembly line, same materials 50 at a time. The Blue ones went into ford boxes, the red ones into brand X boxes, the yellow ones went into Accel boxes, etc.

With a lab scope and a little engineering work you can determine what you have. Like what was posted before, unless you have a modified engine (even then there are alternatives/options) the stock coil will produce 120% of what the plug needs to fire. Over building has limitations as the excess is just "wasted" on each firing. See ignition image on previous postings on coil oscillation humps show excess being spent.

On you fit and installation issue, check the total length of the tube (cheap ones have all kinds of variances. Check with a micrometer the gasket and seat areas. Some posters found that the older style aftermarket coils had a few units where the large metal square was mounted upside down during production and hence the bolt holes were on the wrong side (Quality control from third worlds is always interesting to say the least).
With the pencil coils the boot length and sealing gasket MUST be correct otherwise the unit will not seat in the hole so you never can lock down the flip lock. Trick, add some silicone spray to the boot area which may make the material compress allowing for an insert.

Let us know your findings as everyone is interested in a better out come.
Was not aware you have coil expertise. What coils are out there that are really HYPO coils?
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  #24  
Old 03-06-2019, 06:31 PM
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Good Luck!
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  #25  
Old 03-06-2019, 06:47 PM
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Quote:
Originally Posted by bcredliner View Post
Was not aware you have coil expertise. What coils are out there that are really HYPO coils?
Yea a different life. It's that frustrated engineer in me coming out way too much.
The only ones I have even read about are the two options that make any sense are the complete wiring harness and cam cover change to use the new pencil coils (M5 engines - S62) for racing applications. The shop that builds those engines mentioned that they "may" offer a consumer package some day if there is enough demand. Something I see limited.
LINK to the forum discussion: https://www.m5board.com/vbulletin/e3...onversion.html

...And the Bav Auto branded red ones.
https://www.bavauto.com/bmw-ignition-coil-5002 (Old style coil)

https://www.bavauto.com/mini-ignition-coil-5005 (Pencil or later style)

I will hold off recommending these as the reviews are from users installing plugs and coils with NO dyno testing in a controlled environment showing back to back results. So it maybe all fluff.

Included are the instructions that show that it maybe required to use a LARGE channel lock pliers to lock down the coil flip.
***HINT HERE IS THE SOLUTION on the original posting****


BAVARIAN AUTOSPORT
High-Performance Ignition Coil Installation Instructions

It is located at the VERY bottom of the page on the pencil style units.
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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green

Last edited by StephenVA; 03-06-2019 at 07:01 PM.
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  #26  
Old 03-06-2019, 07:25 PM
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I have spares that my ex-son in law got me in a junk yard. But that said I have never replaced any of the coils on any of my bmw's.

Most have 200,000 miles or so on them. One has over 400,000 miles on it. But I may of just been lucky.

I change the plugs around 100,000 miles normally and that's all I do to them ignition wise.
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  #27  
Old 03-06-2019, 09:46 PM
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I may be on to something. The boots on the bavauto coils slide down with some effort. It looks like I may be able to pull the boots away from the body 3/8 of an inch or so and reduce the “air pressure” in the boot as they push on. Just tried on on a loose plug with success... and had success in seating the body all the way back in to the boot, now to get to the weekend when I can actually test my theory on the car...

Worst case... I’ll stick with the originals that are on there now as I am not experiencing any issues with those. It was more one of those bird in hand deals I couldn’t pass up for $80...


2005 X5 4.4i (04/05 build date)
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