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Last week we ran extensive dyno testing on a TON of plugs on various vehicle. As we're preparing the data for release we don't want to just give you peak tq and hp like most guys do. Come on, realistically, how often are we driving at 7kRPM? I'd love to pull together results at around 2500RPM, but the dyno tests start at around 3500/4000/4500RPM on most of the results. Thoughts on what RPM you'd like us to post results at? Available range is about 3500-5500 on a hemi, 4250-5500 on a 6cyl truck, 3500-5500 on our modded 4cyl.
 

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Alright, well here's an article with testing that we did on all the vehicles, the Dodge Durango included:

We here at sparkplugs.com get a lot of people asking, “What is the best sparkplug out there?” Unfortunately this is a very subjective question that’s nearly impossible to answer. One type of plug may work great in a certain motor, while not working very well in another. Why is this? Well as you know, every motor is designed with very different specifications, and not all sparkplugs are manufactured exactly the same. So one type of sparkplug or sparkplug configuration may work well with a motor, while another one does not.
With the help of Claudio, owner of Pecora Motorsports in Costa Mesa, we were able to dyno test 3 different motor types and a variety of sparkplugs on each. Chances are we didn’t test the exact motor that is in your vehicle, but you should find it interesting how certain plugs performed on the different types of motors we used. The vehicles we used were a stock ’08 V-6 Dodge Dakota, a stock ’05 HEMI V-8 Dodge Durango, and a very custom MG with a CA18DET 4 cylinder turbo motor under the hood.
Keep in mind that the figures you are seeing are wheel horsepower and wheel torque. In other words, some of the actual horsepower and torque that the motor generates is lost in the drivetrain of the vehicle due to friction so the horsepower/torque numbers that you see will be lower than what is advertised for a motor.
Figures that you will see:
-Peak HP
-Peak Torque
-Top Average HP: An average of the peak horsepower numbers attained.
-Top Average Torque: An average of the peak torque numbers attained.
-Lost HP: How much horsepower a plug lost between runs, given in percentage.

’08 6 cylinder Dodge Dakota We started our testing with the Dakota, one of our delivery trucks. Under the hood is a 3.7L V6 motor that sports SOHC 2-valve heads. Rated output of the motor is 210HP and 235 ft-lb of torque. Plugs that we tested were:
-Denso Iridium (IK20)
-NGK V-Power (ZFR6F-11G)
-Denso Double Platinum (PKJ20CR-L11)
-Autolite Double Platinum (APP5224)
-Pulstar Iridium (BE-1i)
-Bosch Platinum+ (FR8LPX+)
-Denso TT (PK20TT)
-Bosch Platinum+4 (FGR8LQP0)
-Multi-Spark, a unique plug that actually uses multiple firing tips for better ignition.
-Autolite Iridium (XP5224)
-Denso Iridium/Platinum SKJ20CR-A8
-Bosch Platinum+2 (FGR8LDP0)
-E3-48
-Blue Lightning, an autolite plug that has been cryogenically frozen to improve conductivity and ignition.
-Autolite Single Platinum (AP5224)
-Pulstar Copper (BE-1c)
-Pulstar Platinum (BE-1p)

Peak Horsepower for the Dakota with standard nickel plug was 127.45
The top 3 plugs that improved upon this number were:
Denso Double Platinum (PKJ20CR-L11) 132.35
Blue Lightning (BLP533 - AP5224) 131.43
Bosch Platinum+ (FR8LPX+) 131.47

Peak torque for the Dakota with standard nickel plug was 135.09
The top 3 plugs that improved upon this number were:
Denso Iridium (IK20) 140.86
Denso Double Platinum (PKJ20CR-L11) 138.11
Pulstar Iridium (BE-1i) 136.50

Top average horsepower for the Dakota with a standard nickel plug was 125.43
The top 3 plugs that improved upon this number were:
Autolite Double Platinum (APP5224) 130.53
Pulstar Iridium (BE-1i) 130.39
Denso Double Platinum (PKJ20CR-L11) 130.24

Top average torque for the Dakota with a standard nickel plug was 131.9
The top 3 plugs that improved upon this number were:
Denso Double Platinum (PKJ20CR-L11) 134.17
Bosch Platinum+4 (FGR8LQP0) 133.83
Denso Iridium (IK20) 133.35

The stock nickel plug lost 2.3% HP between runs. The top three plugs that did better than 2.3% were:
Denso Iridium/Platinum SKJ20CR-A8 1.01%
Denso TT (PK20TT) 1.06%
Pulstar Iridium (BE-1i) 1.24%


’05 Dodge Durango Next in our arsenal of vehicles was our very own customer service manager’s ’05 HEMI Dodge Durango. This 5.7L hemispherical beast with 2-valve pushrods boasts 345HP and 375 lb-ft of torque. This powerhouse was awarded one of Ward’s 10 best engines 2003-2007 and again in 2009. Each cylinder has 2 spark plugs, that’s right 2 spark plugs, which means we had to change out 16 plugs for every dyno run! Go ahead, do the math:
Denso Iridium (ITL16)
NGK IX Iridium (LZTR4AIX)
NGK GP Platinum (LZTR4AGP)
NGK Traditional Plug (LZTR4A-11)
NGK Double Platinum (PLZTR4A-13)
E3.66
Autolite Iridium (XP5263)
Autolite Single Platinum (AP5263)
Champion Traditional Plug (RE14MCC4)
Champion Single Platinum (3570)
Champion Iridium (9403)
Bosch Platinum+2 (HGR8MDP0)
Bosch Platinum+4 (HGR8MQP0)
Bosch PlatinumIR Fusion (HGR8MQI0)
Blue Lightning, an autolite plug that has been cryogenically frozen to improve conductivity and ignition.

Peak horsepower for the Durango with the traditional nickel plug was: 258.71
The top 3 plugs that improved upon this number were:
Autolite Iridium (XP5263) 262.49
Bosch Platinum+2 (HGR8MDP0) 261.79
NGK Double Platinum (PLZTR4A-13) 261.18

Peak torque for the Durango with the traditional nickel plug was: 273.03
No plug surpassed the stock plug for torque, but the two that came closest were:
Bosch Platinum+2 (HGR8MDP0) 272.30
Champion Single Platinum (3570) 271.95

Top average horsepower for the standard nickel plug was: 252.58
The top 3 plugs that surpassed this number were:
Autolite Iridium (XP5263) 259.56
NGK Double Platinum (PLZTR4A-13) 258.03
Bosch Platinum+2 (HGR8MDP0) 258.00

Top average torque with the standard nickel plug was: 267.73
Only one plug surpassed this number, one came very close:
Champion Traditional Plug (RE14MCC4) 267.73
NGK Traditional Plug (LZTR4A-11) 267.66

The standard nickel plug lost 2.37% horsepower between runs. The top 3 plugs that improved upon this number were:
Bosch Platinum+4 (HGR8MQP0) 0.67%
Bosch PlatinumIR Fusion (HGR8MQI0) 0.96%
NGK IX Iridium (LZTR4AIX) 1.07%

MG with CA18DET motor Lastly we hooked up with Aaron Bwana, who is a moderator on nicoclub.com, to dyno his very modified 1977 MGB roadster with a CA18DET engine in it. This DOHC aluminum head, turbocharged, intercooled motor displaces 1.8L and produces 169HP and 166 lb-ft of torque stock. This robust little motor has been modified by some to produce 600HP! It is known for being very torquey and spooling quickly at low RPMs. Modifications on this motor include:
-Garrett T25G turbo
-SDS EM4-F standalone engine management
-Front mount intercooler from an SRT-4 Neon.
-Blitz SS Blow-off valve
-custom I/C piping and intake with K&N filter
-ARP headstuds
-440cc GTR injectors
-Custom 3” exhaust with flowmaster turbo muffler
-HKS flywheel
So now that you know a little about the motor, here’s the plugs we used: NGK Traditional Plug (BCPR7ES)
Denso Iridium (IQ22)
NGK IX Iridium (BCPR7EIX)
Denso Single Platinum (Q22PR-ZU)
Denso Traditional Plug (Q22PR-U)
Autolite Traditional Plug (3922)
E3.64
Bosch Super+ (FR5DC+)
Bosch Multi-Ground (FR5DTC)
Bosch Super+ (FR6DCX+)
Bosch Multi-Ground (FR6DDC)
Bosch Double Platinum (FR6DPP332S)
Multi-Spark, a unique plug that actually uses multiple firing tips for better ignition.
Pulstar Platinum (BE-1p)
Pulstar Copper (BE-1c)
Pulstar Iridium (BE-1i)

Peak horsepower with the standard nickel plug was: 164.00
The three plugs that improved upon this number were:
Denso Iridium (IQ22) 168.71
Denso Single Platinum (Q22PR-ZU) 168.08
Bosch Super+ (FR5DC+) 167.33

Peak torque with the standard nickel plug was: 158.15
The three plugs that improved upon this number were:
Denso Iridium (IQ22) 162.88
Bosch Super+ (FR5DC+) 161.52
Bosch Super+ (FR6DCX+) 161.23



Top average horsepower with the standard nickel plug was: 162.45
The three plugs that improved upon this number were:
Denso Iridium (IQ22) 166.78
Bosch Super+ (FR5DC+) 165.59
Denso Single Platinum (Q22PR-ZU) 165.47

Top average torque with the standard nickel plug was: 157.77
The three plugs that improved upon this number were:
Denso Iridium (IQ22) 161.09
Bosch Super+ (FR6DCX+) 159.77
Bosch Super+ (FR5DC+) 159.11

The standard nickel plug lost 1.7% HP between runs, and was the second best. Only one plug improved upon this number and two more were 2%:
NGK IX Iridium (BCPR7EIX) 0.10%
Denso Traditional Plug (Q22PR-U) 2.00%
E3.64 2.00%
 
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