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What is the current recommended spark plug for a low mileage 997 GT3? Factory plug is the Bosch Y5DDC. Pelican and fcp euro sell a denso plug. Anyone use these? Any others?
Part number: 999-170-129-90
Y5DDC is the correct plug for sure.
I believe based on the price my shop charged me they used Bosch.
My friend ordered Bosch through Rock Auto. I’m a huge FCP fan so I do try and order everything I can through them as well. I unfortunately don’t have experience with the Denso,
Part number: 999-170-129-90
Y5DDC is the correct plug for sure.
I believe based on the price my shop charged me they used Bosch.
My friend ordered Bosch through Rock Auto. I’m a huge FCP fan so I do try and order everything I can through them as well. I unfortunately don’t have experience with the Denso,
As I’ve mentioned, I really enjoy your channel. Great content.
Yes, I should have probably DIY’d. Had my shop do it last year when engine was out for coolant lines. Along with everything else that’s a “while you’re in there” job.
As I’ve mentioned, I really enjoy your channel. Great content.
Yes, I should have probably DIY’d. Had my shop do it last year when engine was out for coolant lines. Along with everything else that’s a “while you’re in there” job.
ty! need to get around to doing some more porsche content but have been busy with the race season.
but, I would have done the same thing if I were in your position. it's nice just to get your car back "and be done"
All threads about spark plugs confirm to stick to the Bosch Y5DDC for the GT3 engine, and I think the Cup car also uses it(I couldn't find otherwise)
There was a bizarre case a few years ago, a piece of porcelain disintegrated and damaged the piston/cylinder. The plug probably fell on the ground, made a tiny fracture and once installed, fell apart causing the damage. Good to inspect closely before installing, and if one falls to the ground, discard it.
This is not a difficult DIY, I like doing it and making sure it's done right. You can find these plugs for about $7 instead of $30 at the dealer-
Out of curiosity (I have 2nd set of dual electrode premium Y5DDC given to me, so I am not yet in the market to buy. but....) in searching for that kinda price point, I see there seems to be a lot of different variants of the Y5DDC
Any insight on why all these plugs can be classified as Y5DDC ?
All threads about spark plugs confirm to stick to the Bosch Y5DDC for the GT3 engine, and I think the Cup car also uses it(I couldn't find otherwise)
There was a bizarre case a few years ago, a piece of porcelain disintegrated and damaged the piston/cylinder. The plug probably fell on the ground, made a tiny fracture and once installed, fell apart causing the damage. Good to inspect closely before installing, and if one falls to the ground, discard it.
This is not a difficult DIY, I like doing it and making sure it's done right. You can find these plugs for about $7 instead of $30 at the dealer-
found tom's post:
Originally Posted by Tom@TPC Racing
I am using Porsche Motorsport 991.602.201.8A, which is the factory spark plug for 991.1 Cup and GT America 4.0L, last of the Mezger engine race cars.
Its a surface-fire plug. I don't have a spare one to take a pic of. Here's an image from FVD's website.
The Bosch #5 is already a pretty cold heat range. We use Bosch #5 for a number of turbo applications for track use as well.
I am using the PoMo surface-fire plugs because I think its more ideal for the increased static compression ratio from the 4.0L crankshaft.
Edit note: 991.1 Cup spark plugs can be used on 997 GT3 cylinder heads but won't fit on 996 GT3 cylinder heads because they are different diameter.
Otherwise, many places are out of stock for some reason
Also, the Porsche dealer version has a copper tip, the non dealer has a silver tip, makes no difference. What did seem to change recently is the non dealer now has green stripes. This picture from a few years ago showed non dealer had blue stripes. Why pay the dealer $30+ price?
BTW, it might also help to search BMW Bosch Y5DDC, some M3 cars used them-strangely it's become harder to find them, though ECS didn't seem to have restrictions on quantity-
03-15-2021, 09:21 PM
997.2 GT3 spark plug choices?
