tune with upgraded plugs?
#1
Registered Member
Thread Starter
tune with upgraded plugs?
My car is boosted with the stillen kit. I'm looking to upgrade my spark plugs to the GTR plugs. would i need to retune or no? i've heard mixed answers.
#2
Registered Member
Do you need GT-R plugs for the SC? I thought this was only required if you went with a turbo? I spoke with Stillen when I did my V3 kit last year and they did not suggest different plugs. I put in new plugs prior to my tune but stayed with the OEM ones.
#3
Registered Member
iTrader: (13)
Yes you do need them rule of thumb is for every 100 HP you will need a heat range colder plug. I ran the GTR plugs in mine with the Stillen SC- but no retune
Last edited by ANMVQ; 03-23-2016 at 11:12 AM.
The following users liked this post:
abrecos (01-01-2022)
#4
#5
Registered Member
So yet more bad advice from Stillen... I had pretty much forgotten about my nightmare with them last year and it now all comes flooding back. Thanks for this ANMVQ and Waste86. Here is a NGK article that is quite detailed:
https://www.ngk.com/learning-center/...or---do-i-need
https://www.ngk.com/learning-center/...or---do-i-need
#7
Registered Member
Thread Starter
I've called a few tuners and they've given me mixed answers. Some say you need a retune and some say I don't. I think I'm just going to be safe and change them with OEM plugs. I'd change to the GTR plugs and tune it if i had a tuner in my state
Trending Topics
#8
All the plugs are doing is preventing pre-ignition by going a step colder. There is absolutely no effect on the tune. the only time this would come into play is if you are running way out of heat spec plugs (say running really hot and pre-igniting a lot) and then going to a colder plus will buy you some more leeway on the pre-ignition, and you may be able to adjust your timing tables slightly more aggressive. That is just treading such a fine line that I did not consider it worth mentioning, as you want more fail safe to avoid knock. If I am wrong, someone please let me know.
#9
Registered Member
GTR Plugs the same as G37?
Hi guys... I spoke with my tuner after this discussion and he said that he did recommend a colder plug... and that no retune is required. So I ordered a set of GT-R plugs from an ebay vendor and they just arrived today. I was a bit startled when they were exactly the same as the OEM ones that came out of my car when I installed new plugs for the SC install. OEM for the G37 is Denso FXE24HR11. I looked up GT-R plug and it is the exact same plug. I called Concept Z and asked them and they recommended a NGK93026 (heat range 8) which is exactly the same as the Denso heat range 24. See Spark Plug Cross Reference HEAT RANGE CHART
So now I am the proud owner of a new set of plugs that I don't think I need. I am really surprised that the GT-R plugs are the same as ours.
So now I am the proud owner of a new set of plugs that I don't think I need. I am really surprised that the GT-R plugs are the same as ours.
#10
Hi guys... I spoke with my tuner after this discussion and he said that he did recommend a colder plug... and that no retune is required. So I ordered a set of GT-R plugs from an ebay vendor and they just arrived today. I was a bit startled when they were exactly the same as the OEM ones that came out of my car when I installed new plugs for the SC install. OEM for the G37 is Denso FXE24HR11. I looked up GT-R plug and it is the exact same plug. I called Concept Z and asked them and they recommended a NGK93026 (heat range 8) which is exactly the same as the Denso heat range 24. See Spark Plug Cross Reference HEAT RANGE CHART
So now I am the proud owner of a new set of plugs that I don't think I need. I am really surprised that the GT-R plugs are the same as ours.
So now I am the proud owner of a new set of plugs that I don't think I need. I am really surprised that the GT-R plugs are the same as ours.
To be honest, I was going to chime in and say that the heat ranges are different for the plugs. However, the information I have found seems to say they are the same heat range. The NGK has a smaller gap (.03X compared to .044 of our Denso). I kept hearing they were a step colder, but I can find nothing that supports that.
#11
Registered Member
To be honest, I was going to chime in and say that the heat ranges are different for the plugs. However, the information I have found seems to say they are the same heat range. The NGK has a smaller gap (.03X compared to .044 of our Denso). I kept hearing they were a step colder, but I can find nothing that supports that.
#12
Heat range 8 for the NGK = heat range 24 for Denso. I know of a Z turboed to over 500HP running the denso range 24 plugs with no problems. I am stunned how misinformation gets passed around on these forums and accepted as gospel. Everyone saying get GT-R plugs and they are exactly the same as OEM for Z or G37
#14
I can understand the smaller plug gap. However, everyone seems to go them because they are told they are a heat range colder than stock, which does not appear to be true.
#15
Super Moderator
iTrader: (7)
Run the plugs you want for a few thousand miles and check them for electrode erosion and soot. If no soot, repeat the test with a cooler plug. Keep repeating until the car starts to mis-fire or the plugs begin to develop soot. You know you're one range too cold then.