colder heat range spark plugs to use with nitrous?? - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 8 (permalink) Old 05-11-2019, 10:21 PM Thread Starter
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colder heat range spark plugs to use with nitrous??

Hoping someone can give me a product number for a spark plug that is one heat range colder than the OE plug in a 2017 SXT Plus 3.6L....I've been going back and forth with NGK they tell me I need #SILKR8E8D. Apparently that is a special plug for a very unique application that is not for sale in Canada. I am having NO luck finding these plugs anywhere. Hopefully someone here can point me in the right direction...
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post #2 of 8 (permalink) Old 05-12-2019, 01:07 AM
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This is what they use in the Wrangler 3.6l, should be the same for the Challenger 3.6L. You might contact Prodigy, or Ripp to see if they can confirm

https://prodigyperformance.com/produ...jeep-wrangler/

Ripp lists 1118lx36-b, but it's likely their own part#

https://rippmods.com/collections/dod...12440748261440

They should be able to confirm if they are 1 step colder than the NGK 9723 or NGK 93911

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post #3 of 8 (permalink) Old 05-12-2019, 06:48 PM
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In looking closer, looks like Ripp is selling the DR8EIX, it's also a heat range 8 (1 step colder than stock 7 plug), but the reach is 19mm as opposed to the PRO-NGK-LI Prodigy sells which is 26.5mm.

The gap recommendation is different for both too. I'd reach out to Prodigy personally

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post #4 of 8 (permalink) Old 05-12-2019, 09:21 PM Thread Starter
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In looking closer, looks like Ripp is selling the DR8EIX, it's also a heat range 8 (1 step colder than stock 7 plug), but the reach is 19mm as opposed to the PRO-NGK-LI Prodigy sells which is 26.5mm.

The gap recommendation is different for both too. I'd reach out to Prodigy personally

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Thanks for the help!! I reached out to Prodigy via Facebook messenger. I asked about those plugs. They told me they have no stock at the moment and gave me the product number #6706. I crossed referenced them to the OE plug and they seem like the perfect match. I sent an email off to NGK asking if they see any issue if I run those plugs with my nitrous set up. Hopefully I will hear back from them soon...This is the last piece of the puzzle. I sent my spare ECU to Diablosport for "unlocking", my Intune i3 should arrive tomorrow (so I can retard the timing a few degrees @ wot) & the Nitrous Express kit should arrive from Summit later this week. So I'm hoping real soon to try some "throttle in a bottle" on my 3.6L pentastar. 😎
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post #5 of 8 (permalink) Old 05-12-2019, 10:34 PM
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They don't say if they are in stock

https://www.vividracing.com/ngk-spar...152457235.html

The NGK 6706 does seem to have the same specs as the Prodigy.

Several places appear to have them under LKAR8AI-9. Lowest price with a quick search may be Summit (they do show shippping on 5/28) , but Amazon has free shipping. At least if this is what you need, you know you can get them. Seems to be used mostly in bikes

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post #6 of 8 (permalink) Old 05-13-2019, 07:00 AM Thread Starter
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They don't say if they are in stock

https://www.vividracing.com/ngk-spar...152457235.html

The NGK 6706 does seem to have the same specs as the Prodigy.

Several places appear to have them under LKAR8AI-9. Lowest price with a quick search may be Summit (they do show shippping on 5/28) , but Amazon has free shipping. At least if this is what you need, you know you can get them. Seems to be used mostly in bikes

A Guy
Well, the search continues🤪......Attached is the response from NGK with regards to using the spark plug that Prodigy reccomends plus one other number I found in a forum....
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post #7 of 8 (permalink) Old 05-13-2019, 07:04 AM Thread Starter
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They don't say if they are in stock

https://www.vividracing.com/ngk-spar...152457235.html

The NGK 6706 does seem to have the same specs as the Prodigy.

Several places appear to have them under LKAR8AI-9. Lowest price with a quick search may be Summit (they do show shippping on 5/28) , but Amazon has free shipping. At least if this is what you need, you know you can get them. Seems to be used mostly in bikes

A Guy
Well, the search continues🤪......Attached is the response from NGK with regards to using the spark plug that Prodigy reccomends plus one other number I found in a forum....
Just got a response from NGK in the US...."Hello. Thank you for your inquiry. we offer a new line of plugs called Ruthenium HX and they are a very good choice for you in this case. The part number for one step colder is LKR8BHX-S. In the future, if you have any questions, please contact our Canada office tech support at (877)277-2759 or you can email them at [email protected] . Thank you and have a GREAT week!"
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post #8 of 8 (permalink) Old 05-13-2019, 06:17 PM
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All the numbers match up except the hex and slightly different gap. I'd certainly want to go with the manufacturer. Ruthenium, lol

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