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02-01-2023, 12:00 AM | #1 |
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Anyone running NGK 97506?
Anyone with a supercharger running NGK 97506 2 Step colder plugs? I searched the forums didn't find much. I know of one member running them without issues curious if anyone else out there is running them without issues.
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02-01-2023, 04:39 AM | #2 |
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Remember that the S65 is unique with its ionic knock control built into the coils and specified for use with LKR8AP plugs. Changing plugs is not common in this platform and would risk the knock control not reacting properly.
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02-01-2023, 05:16 AM | #3 |
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02-01-2023, 07:18 AM | #4 | |
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Quote:
NGK 93253 R2556G-9 It’s an iridium plug and at least some of us are using them on supercharger kits to extend plug life (30-40k miles versus 10k miles). |
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02-02-2023, 10:39 AM | #5 | |
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I would be super-interested in this, but I've been burned before using other iridium plugs. -_-
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02-02-2023, 11:27 AM | #6 |
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This same topic is discussed in these threads. Search the forums or threads below by keyword = R2556B-9 or R2556G-9
https://www.m3post.com/forums/showthread.php?t=1763451 https://www.m3post.com/forums/showthread.php?t=1070943 https://www.m3post.com/forums/showthread.php?t=1802212
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02-02-2023, 08:07 PM | #7 | |
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Reading your suggestions and searching the forums didn't yield much of the answer I was looking for I guess (or I'm not very good at it). There was a post, from your above, someone asked/mentioned whether the Harrop supercharger mod didn't use the ion-sensing. "I guess they don't use the ionic knock sensing?" This makes me think that perhaps this feature is modified or even turned off (kinda doubt it turned off) within the Harrop tune...? I couldn't find much detail here to confirm if a tune was made directly for this in the installation pdf: https://www.harrop.com.au/shop/tvs1740-bmw-e9x-m3 I know the OP originally intended the question to be for supercharger configurations (which imply a tune of some sort), but what about using this iridium spark plug with stock-tune, NA? Would the ion-sensing work appropriately enough using the iridium race plug?
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02-02-2023, 08:43 PM | #8 | |
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. https://www.m3post.com/forums/showpo...&postcount=148 From the post above: "I was told the only reason these NGK Iridium Racing plugs work so well in boosted applications is because in boosted applications the misfire sensing routine has been 'coded out' with (by) the supercharger tune(r). Not that these plugs ever misfired when I was running them." . As far as I understand the topic(s): The ionic knock sensing routine is not the same subroutine as the misfire sensing routine. More simply put: the stock tune would "see" boost as a misfire. Hence, tuner(s) code such functionality out to allow boost to be run with the S65 DME. Hope this helps: PS: Over the years, this exact topic of alternative spark plugs has caused serious debate on the forums. Happy searching. PPS: Not all NGK iridium plugs are the same as NGK Racing iridium plugs.
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02-02-2023, 08:51 PM | #9 | |
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Okay. That is explanation enough, and now it makes sense!! You're clearly a better searcher than me! lol
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02-02-2023, 11:34 PM | #10 |
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Just to add these plugs are favorites for stage 2 n54's that are highly boosted and s55's as well but then again you have to gap them to your specific preferences. Not sure how that translates to a supercharged s65 with tune..
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02-03-2023, 07:09 AM | #13 | |
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I bought my car in ‘18 with the blower kit installed. I needed to get the car SMOG’d, so I removed the blower kit except that I left the NGK Racing plugs and the big injectors in place thinking I’d save myself some time. The car would barely run, all popping an farting…not good!
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02-03-2023, 07:12 AM | #14 |
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This is an interesting question and I am not an automotive electrical engineer. My very simplistic guess is that if plug resistance is the same, there should be no effect on current measurement during the exhaust stroke. As I understand, the requirement that misfire detection has to be disabled is for forced induction in general, not specific to use of aftermarket plugs.
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02-03-2023, 07:46 AM | #15 | |
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Quote:
https://www.m3post.com/forums/showthread.php?t=1763451 .
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Last edited by DrFerry; 02-03-2023 at 07:57 AM.. |
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02-03-2023, 08:00 AM | #16 |
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I'm interested to know how many miles you've put on the OEM spec NGK plugs in the last 3 years in your E85 boosted application?
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02-03-2023, 09:19 PM | #17 | |
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I am interested in going with a 1-2 step colder plug but I need to consult with my tuner, interested to see if there is any actual benefit…..
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02-03-2023, 09:41 PM | #18 | ||
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02-04-2023, 02:03 PM | #19 | |
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I have no doubt the oem plugs in my current setup will last 10-15k. The benefits of the colder plug are obvious, I will have to check with my tuner to see how the knock system is being managed currently. With bpm handling the tuning for the harrop kits, what has Mike had to say regarding running the colder plugs and their effects on the knock system? (Forgive me if it’s covered in another thread).
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02-04-2023, 02:16 PM | #20 | |
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One day I’ll dig into the details regarding the wizardy of the ionic knock sensing routine inputs because other people have speculated all that’s important is the resistance of the plug. Whatever the case, I and others have run these particular plugs successfully for over 50K miles without problems BUT only because our Harrop supercharger tune disables the misfire DME subroutine coding - as do other supercharger tunes such as G-Power or VF-Engineering. Please do let us know what your tuner says..
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02-04-2023, 03:44 PM | #21 |
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E85 burns cooler. Could the reduced combustion temperature also reduce the need for a cooler plug? I would probably focus more on reducing spark blowout and increasing spark energy given the larger combustion event from the airflow of 12.5psi. Reduced gap and/or stronger coils, but I would also want to be confident any changes did not affect the knock sensing though E85 (assuming it is tested to be E85) should reduce the likelihood of knock. Probably the E85 tune is really an E60 tune if pump E85 is being used since it is well known the E content can vary.
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02-05-2023, 09:52 AM | #22 | |
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