Here are some of the claims made by the wires:
MPG/PLUS GAS SAVING IGNITION WIRE SET
Granatelli Performance Ignition Wire Set is GUARANTEED to boost your MPG to 15%!
Boosts horsepower and torque and ensures a smoother running engine
Rates 0-ohm resistance (compare to 4,000-7,000 ohms for conventional wires)
Granatelli's MPG/Plus Performance Ignition Set is an easy way to significantly increase your gas mileage...not a bad idea these days! Also increases horsepower and torque for better engine performance and a more responsive ride. The MPG/Plus Performance Ignition Set features 0-ohm resistance solid stainless steel core wires plus an RFI/EFI Hybrid Protection Ring that prevents stereo noise and allows full coil power to reach the spark plug. The result is full power, a hotter spark, more complete combustion, better fuel efficiency, more power and better overall performance...without replacing the coil! Premium technology throughout: stainless steel inner core for high tensile strength, silver plated copper outer core for high conductivity, EPDM insulation, fiberglass braiding for strength, 500° silicone jacket and boots and heavy-duty stainless steel snap-lock terminals at the spark plug! Meets or exceeds OEM specifications. Limited lifetime warranty.
This got me thinking... How do my original Mopar wires do and how do other kits around town perform?
I went to Napa, Auto Zone and O'Riely Auto parts and bought all the SRT-4 spark plug wire sets that they had in-stock. I then used my Craftsman Digital Volt Meter on the Ohm to connect the terminals and measures Ohm resistance.
The Wire Kits Being Tested:
Bosch Premium Wire Set - Part Number 09477 - Cost $33.99 at Autozone or $23.73 on Amazon
- Opti-Layer Mag Wire (Stainless Steel Mag Winding w/ Kevlar Reinforced Core and Silicone Jacket)
OmniSpark Ignition Wire Set - Part Number 9615 - Cost $29.99 at O'Reilly Auto Parts
Duralast - Part Number 4702 - Cost $29.99 at Autozone
- 7mm wires w/ Silicone Jacket
BWD Select - Part Number CH74200 - Cost $33.99 at O'Reily Auto Parts
- 7mm wires w/ SuperMag core (Stainless Steel Wound Conductor w/ Silicone Jacket)
As you can see all of the wires were priced between $30-$34, so you'd think the results would be the same. To be honest it looks like the Bosch, Duralast and OmniSpark plugs are all made by the same company. The boxes are the same dimensions, the instructions in the box were identical on two of them and they were all held together by the same red twist tie... Great, here we go with re-badged wires! Well, they weren't and I found the differences to be amazing! Even the guy at Autozone said I wouldn't find a difference between their Duralast and Bosch brands, but boy was he wrong.
As you can see the Ohm variance was huge between the wire sets. None of the wire sets were zero Ohm like the Granatelli MPG wire set, but the differences were huge. My original 2005 factory Mopar 7mm wires tested out at 2639 Ohms, so I used that as my 'baseline' for my thoughts here. The BWD Select and Bosch Premium wire sets were the most expensive of the bunch and proved to have the lowest resistance. The BWD selects were 383 Ohms on average and by far the best of the bunch if Ohms really mean anything. The Bosch Premium wire set looked good also, but one wire of the bunch was higher than the rest. The OmniSpark Ignition Wire Set was the worst of the bunch in terms of quality control as one wire had 3x more resistance than the other wires! The Duralast wireset was the worst of the bunch as the ohms between wires was far from consistent and the resistance was more than double the factory wires.
Based on the Ohm testing along with the likeness in Ohms on the BWD Select wires, those are the wires that I selected to use.
I also compared a wire from each set with a spark plug in it to check that out. The NGK V Power 4306 copper plug had more resistance than the NGK IX Iridium 2314, but that was expected. What is pretty wild though is that the BWD and Bosch wire sets have pretty much the same Ohm resistance that the OmniSpark and Durlast sets do without a spark plug!
So NGK Ix Iridium and BWD wires will be replacing my OEM setup! Who knows if it matters, but lower resistance sounds better for when it comes to putting the spark where it needs to be. Who knows if MPG improves or if you get any horse power / performance gains.