Denso Iridium plug info

[jacobsen]

I used the Denso IK20 plugs gapped to .28 for about 500 miles before I experienced a bad misfire.
I bought some cheap champion coppers to test the misfire condition and rule out the plugs. The car ran good on the cheap champion plugs for about 1 week or less and one of the insulator tops broke off.
I have a set of IK16 as well for my Galant I might try and put in the 1.8 audi just to experiment based on my question here.
I installed a new pair of Denso IK20 and this time did not gap them at all. I ran for about 1 week before experiencing the misfire condition briefly on a highway exit ramp.
At least I went longer this time, I really like the better Iridium plug... I think the IK20 is too hot of a plug for my car, I have APR Chip, large injectors and APR exhaust so... I'm thinking because of that I need a colder plug probably IK22, IK24 might be too cold? The car runs great with pfr7q plugs. Which I believe is a step colder on NGK scale. Both Denso and NGK heat numbers go up the colder they get.

I've been running PFR7Q with no issues for the last 10k... I am thinking the correct Denso plug for this application would be the IK22 since it is one step colder and I've already been running a one step colder NGK plug with success. Denso iridium is better than NGK because of the smaller electrode and rhodium alloy in the iridium... I've looked into the plugs, if you were wondering why I like Denso Iridium so much it is better on mileage and performance.

If any one else has input or experience on this plug situation tell me what ya think.

[diagnosticator]

Try the Bosch Iridium plugs. This plug uses iridium in both the fine wire center electrode and the ground side. While the Denso and the NGK plugs are very good, there is nothing better from the quality and technology viewpoint than Bosch. In addition, the Bosch Iridium plugs have a 7 year performance guarantee.

BTW, Welcome to Audizine!

[milan2k13]

Bosch plugs> NGK plugs?

[MikTip]

NGK makes an Iridium as well...

[CyberPMG]

I'm running NGK Iridium plugs. They've been great. For a stock engine, look for BKR6EIX plugs. Move up to BKR7EIX for tuned cars. Then go to BKR7EIX-11 when you upgrade to FSI coils.

[MikTip]

I run the BKR7EIX-11 with my 06E TFSI coils. Noticable improvement over the stock setup!

[jacobsen]

Denso Iridium has to be the best plug I've ever used, this information about Bosch having double Iridium is interesting. Gotta think they are the ultimate plug but I'm not sure I want a 4 ground plug... If I want to gap to .28 that could be tricky?

[Charles.waite]

I'm running NGK Iridium plugs. They've been great. For a stock engine, look for BKR6EIX plugs. Move up to BKR7EIX for tuned cars. Then go to BKR7EIX-11 when you upgrade to FSI coils.

This 100%.

[milan2k13]

Denso Iridium has to be the best plug I've ever used, this information about Bosch having double Iridium is interesting. Gotta think they are the ultimate plug but I'm not sure I want a 4 ground plug... If I want to gap to .28 that could be tricky?

I always thought NGK plugs were top of the line..

[EBG 18T]

Weird. My car hated the Ngk iridiums. I have to stick to Bosch plat side fires.

[NyteEscape]

anyone have part numbers for the bosch iridiums? are these the 3 electrode ones that everyone talks about?

[jacobsen]

Is there a discount at TRS for members here?

[jacobsen]

I always thought NGK plugs were top of the line..

Denso has the a .04 electrode where NGK has a .06, smaller is better. Also the Denso has the rhodium alloy which prevents oxidation. That small electrode is where it's at. Denso and NGK are very close but Denso ftw imho...

[Charles.waite]

anyone have part numbers for the bosch iridiums? are these the 3 electrode ones that everyone talks about?

No they're the side fire ones. F5DPOR.

[MikTip]

Bosch F5DPOR's are "Platin" side fire originally developed for the 20VT 5 cylinder engines.



Bosch Iridium's are their answer to Denso and NGK's Iridiums:



Then theirs Bosch Platinum Iridium Plugs:

[milan2k13]

Should I just stick to ngk bkr7e.. or is there a better plug?

[old guy]

Should I just stick to ngk bkr7e.. or is there a better plug?

With your big injector file I would recommend either the F5DPOR or the BKR7E-IX if you want to save a few$$. Changing plugs every 5-10k miles is tedious and unnecessary.

[milan2k13]

Quoting diagnosticator, source: http://www.audizine.com/forum/showth...-vs-NGK-BKR-7E
''BTW, multi ground electrode plugs, are more reliable long term compared to single ground plugs, but are not the best choice for performance applications. The reason for this is because the multiple ground electrodes tend to shield the spark kernel from exposure to as much ignitable fuel/air mixture as possible, especially at high rpms, when the available time for ignition to occur is minimal.
Single ground electrode plugs will produce better ignition performance at high speeds and loads compared to multi ground electrode plugs. ''

[old guy]

And if you really want to get obsessive you can index your plugs (Tech tip #4) Clicky click

[milan2k13]

''With modified engines (those engines that have increased their compression) more heat is a by-product of the added power that normally comes with increased compression. In short, select one heat range colder for every 75-100 hp you add, or when you significantly raise compression. Also remember to retard the timing a little and to increase fuel enrichment and octane. These tips are critical when adding forced induction (turbos, superchargers or nitrous kits), and failure to address ALL of these areas
will virtually guarantee engine damage.''

[diagnosticator]

Denso Iridium has to be the best plug I've ever used, this information about Bosch having double Iridium is interesting. Gotta think they are the ultimate plug but I'm not sure I want a 4 ground plug... If I want to gap to .28 that could be tricky?

The Bosch Iridium plugs are single ground, not four. Plugs with multiple ground electrodes must not be regapped.

http://www.boschautoparts.com/SparkP...s/Iridium.aspx

[jacobsen]

Every other spark plug maker puts all the specs on there site, I didn't see any gap spec on it, or electrode thickness.