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Spark plug question

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Old 04-27-2015, 05:41 AM
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John Chan
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Default Spark plug question
What brand and model should I get?
Sun coast is very expensive for QT6 about $190 range
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Old 04-27-2015, 08:09 AM
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RajDatta
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Bought same ones from rmeuropean for a lot less. Changed them last week.
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Old 04-27-2015, 02:26 PM
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Spyerx
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Rmeuropean part 99917012990

Bosche Y5ddc
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Old 04-27-2015, 02:36 PM
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ilko
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Under $10 a piece: http://www.ecstuning.com/Search/Site...990/ES2003480/
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Old 04-27-2015, 03:24 PM
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John Chan
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Is Bosch Y-5-DDC the right one?
Same part # but oem genuine is 3 times more $, is it necessary?
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Old 04-27-2015, 04:25 PM
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Originally Posted by John Chan
Is Bosch Y-5-DDC the right one?
Same part # but oem genuine is 3 times more $, is it necessary?
Yes 100% identical. Well the plug is. The box doesn't have the porsche part number.
Y5dcc is the correct plug for the 07-8
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Old 04-27-2015, 08:29 PM
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Originally Posted by Spyerx
Yes 100% identical. Well the plug is. The box doesn't have the porsche part number.
Y5dcc is the correct plug for the 07-8
Not 100% identical.
The original has what I think is a slightly better shaped contact tips but however there's absolutely zero difference in function from my experience.







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Old 04-27-2015, 08:38 PM
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I guess can unscrew the old Porsche oem tip and transfer over if needed
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Old 04-27-2015, 10:33 PM
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Originally Posted by Tom-TPC Racing
Not 100% identical.
The original has what I think is a slightly better shaped contact tips but however there's absolutely zero difference in function from my experience.
Interesting. I have a set installed by a Porsche dealer and the ones I pulled out were identical to the non Porsche ones I put in. Wonder if they had a change at some point. Even the Markings on the ceramic are the same.
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Old 04-28-2015, 01:57 AM
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bmwtye
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Rockauto.com also has them. They were 8.24 each when I bought them
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Old 04-28-2015, 08:06 AM
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NAM VET
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plugs can look the same, but have different "heat" ranges. A plug has to get hot enough to burn fuel carbonized deposits off the electrode insulators. Not "hot" enough, the plug gets fouled, too "hot" and it can cause pre-ignition, or at least that is way i remember it when i was choosing plugs for my built Cobra's motor. Plugs for street engines are a compromise. As for alternate plugs for our motors, I have no suggestion.

All the best...
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Old 04-28-2015, 09:30 AM
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In this case the number "5" in the Y5DDC is the heat range.
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Old 04-28-2015, 09:31 AM
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Originally Posted by Spyerx
Interesting. I have a set installed by a Porsche dealer and the ones I pulled out were identical to the non Porsche ones I put in.
Maybe the dealer is increasing their profit margin by buying plugs off the internet!

Originally Posted by NAM VET
plugs can look the same, but have different "heat" ranges.
True, but the Y5DDC is the proper plug for our GT3's. No reason to use anything else.
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Old 04-28-2015, 10:06 AM
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Originally Posted by RedRSA
the Y5DDC is the proper plug for our GT3's. No reason to use anything else.
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Old 04-28-2015, 12:50 PM
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Originally Posted by Tom-TPC Racing
Not 100% identical.
The original has what I think is a slightly better shaped contact tips but however there's absolutely zero difference in function from my experience.







Excellent point. I noticed this as well when I changed my plugs last week. The tips where quite tight and I couldn't make them budge. So, I stuck with how the new plugs came. Ran the car over the weekend and she was very happy .
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