93
Will output and torque increase if I use Iridium
Power plugs?
These are chassis dynamo test results comparing a Vitz 1300 using Iridium
Power plugs and another which uses regular plugs are shown below.
With the normal plugs, the output is 98.2PS, while torque is 14.8 kgf; when
this was changed to the Iridium Power plugs, the output was 99.3PS, while
torque was 15.2 kgf. (This is approximately a 1.5% improvement in output.)
Will my exhaust emissions be cleaner if I put
on Iridium Power plugs?
Improved combustion efficiency will clean your exhaust emission! Fuel consumption will improve too!
With the superior ignitability of ultra-thin electrodes
(0.4mm), combustion efficiency will be improved.
◎Cleaner Exhaust Emissions
CO and CO2 levels will decrease in the "EURO III"
emissions test to be implemented in the future.
◎Improved Mileage
A great bonus for long-distance drivers.
Even for those who are concerned about the
environment, we recommend Iridium Power.
■
Iridium Plug Motorcycle Emissions Comparison Test
Test Vehicle
：CBR250
Test Conditions：EURO
Test Equipment：MEXA-7400, CVS 7100
Tested Plugs
：U24FER9 (Ni Plug) Gap: 0.85
：IUH24 (Ir Plug) Gap: 0.85
I have a 4AG engine NA tuned, with a Solex 44
dia. carburetor installed, giving a 200PS output.
Which plug is good for a car such as this?
DENSO has Iridium Power and Iridium Racing to meet the
needs of tuned and racing engines. For the engine
described in the question, the right plug should be around
Iridium Power IK (IQ) 22, 24, or 27. Here is an introduction
to using the different types of the Iridium Series on racing
engines.
●
Iridium Power:
NA Tuned (Short distance racing), Turbo tuned
where a regular turbine has been tuned to increase the boost.
●
Iridium Racing (01 Type):
The 01 Type is usually called
the slant ground electrode type. If your car is turbo tuned
where the turbine has been replaced and the boost pressure is
above 1.2 to 1.3kg/cm2, an Iridium Racing 01 type is needed.
Also, if a NA tuned engine with comparatively high vibration (4
cylinders) is to be raced over long distances, switching to this
type can increase the reliability of the ground electrodes.
●
Iridium Racing (02 Type):
The 02 type (flat ground
type) is appropriate for higher output engines than the 01
type, but because the spark position is withdrawn compared
to the 01 type, only consider this plug for racing applications.
Is there a standard for differentiating the
uses of Iridium Power and Iridium Racing?
Iridium Racing uses a platinum tip for the ground electrode and
a high strength fine insulator for racing. Also, there is a silicone
coating on the insulator giving it an increased resistance to
carbon fouling. However, because of the withdrawn spark
position, the Iridium Power has the high ignitability of the two.
Instead, because of the "extension" in engine revolution felt by
many at high revolutions, it is popular with customers who race.
Choose "Iridium Power" for response and "Iridium Racing" for
high revolutions. Iridium Racing is particularly popular on the
circuit scene. (In the '03 Motegi 7 Hour Open, it was found that
45% of the vehicles used Iridium Racing※) ※DENSO findings
120
100
80
60
40
20
0
30
25
20
18
10
5
0
45
90
135
180
km/h
(kgm)
Horsepower (Ir)
Power (Regular)
Horsepower (Ir)
Power (Regular)
Internal data
Test 1
24.5
24.6
24.7
24.8
CO（g/km）
EURO III Test Pattern
24.9
25
25.1
25.2
25.0523
24.7491
Test 2
25.1569
24.7826
U24FER9
IUH24
Regular Plug
Iridium Power
140
120
100
80
60
40
20
0
Speed
(km/h)
Time
Internal Data
Internal Data
Test 1
18.9
19
19.1
19.2
Fuel Consumption (km/L)
19.3
19.4
19.5
19.0967
19.4606
Test 2
19.1110
19.4241
Test 1
69.5
70
70.5
71
CO
2
（g/km）
71.5
72
72.5
72
72.7682
70.9184
Test 2
72.1660
70.9778
Internal Data
Internal Data
