morganabowen

I was at a car show last week, and got into a conversation with a mechanic who has a shop in West LA. He said to me that the red spark plug wires are not as good as the factory (black) wires. I was wondering what the people on this board believe are the best spark plug wires for the 928 S-4?? TIA

Giovanni

I had knology and my personal advise is stay away from them.

JHowell37

How would you define the best? Longevity? Ease of installation? Performance? Clarity of markings?

dr bob

The factory wires are very low resistance right out of the box, with the resistance in the plug ends on the S4+ cars. The system depends on relatively equal resistance in all the leads to keep spark energy and timing consitent among all the cylinders no matter how long or short the wire might be. For a long time, plug wire mfr's have hyped their new latest-and-greatest super whamadyne plug wires, offering some pretty amazing claims for improvement over stock. In reality, the improvements available are better or more consistent electrical performance, and/or better/thicker/prettier insulation on the wires. The electrical performance thing is already defined to what the OEM Beru wires give you. The insulation on the Beru wires is more than adequate when new.

As the insulation ages, it develops crackes, gets dirty, dries out, etc. That means more possible leakage paths for the high voltage running through it. The little electrical lighht show sometimes seen in the engine bay at night when humidity is high is an example of what leakage looks like.

So when replacing, look for non-resistance wires with consistent-resistance connectors. Look for insulation that's at least as good as the original. After that, you pay for Bling! colors, the sticker, the ground wire, and all new harness supports and brackets when you change from the OEM parts.


If the car is running fine (and yours is...) I wouldn't waste money on another set until the ones you have start to break down. Then maybe look again at what you want it to look like when you're done. Electrically, the OEM wires are more than adequate for what the stock ignition coils can deliver. If you want fatter red or other non-black wires, choose carefully. Or go with a set of Beru OEM wires.

For a while, Mark Robinson offered a "just the wires" kit for use with the original plug conectors and boots. 928 Int'l offers the factory wires already harnessed and ready to drop in, all connectors installed and all the wires numbered correctly. The 928 Int'l option would be my choice.

Bertrand Daoust

I think Roger (928R-Us) has both. Beru's full harness and Beru's wires only.
At a very good price too...

hacker-pschorr

Up until this year I would buy Bosch or Beru (the Bosh had Beru ends so I figured what's the difference). The last set of Bosh wires did not have Beru ends on them, but some cheap "made in china" ends. They were almost impossible to click onto the plug.

I ended up swapping the ends from my old wires. I'm thinking about buying the crimp tool & making my own next time.


EDIT - my 928's are 16V's

morganabowen

Thanks to all of you for the advice

Jim Morton

Anyone use Magnecor KV85 ???

Kind of curious.

Ketchmi

We sell a ton of the Magnecor's, I have never had a problem with them.

ROG100

I have complete sets of Beru wires available in black, red & blue for $99 a set including the coil wires.

Mike B

"Tick"...added to the list

Ketchmi

I got into a huge online argument with the owner of Nology about his claim that his plug wires "created" power. Being an electronic engineer myself, his claims just didn't hold water. He proceeded to try to BS everyone else in the forum while not answering my questions. Did you know that you could create more voltage and current by shielding the wire? Didn't matter to him that the supply voltage/current was the same, he swore he had more output. Ain't happinin'!

blown 87

If you get more energy out, than you are putting in, the oil company's are going to kill you.

dr bob

Obviously, you failed to use inductive reasoning, that's what causes the bad reaction!

...Resistance is futile!!...

SeanR

When you are replacing just the wires and not the end caps, make sure you do an Ohm test on each end. Those at the distrubuter and the plug. Each end has it's own Ohm/resistance. When you look at them, you can see what the impedence is supposed to be. If any of those are out of wack then you need to buy a new end piece.

I got just the wires for mine, and upon testing, 1 dist cap end was bad, and one plug end was bad.

You can save yourself a buttload of $$ if you just buy the wires and screw the caps back on to them, but you might not gain a dang thing if the end caps are not up to snuff.

Rog has all of that in stock. I think with the 2 bad ends and wires, I paid less than $120.00. Great deal to me.