Reliable ignition coils for the S63TU motor?

[Used2be]

I don't currently have a problem with my coils, but think it prudent to buy 8 to have on hand. When I looked into getting them I never realized there would be so many choices of manufacturers. I believe Bosch is the OEM brand, but are there other brands that have proven reliable? The prices are all over the place with various retailers asking more for Delphi than Bosch, and another the reverse, odd. So, if you have had personal experience with a brand please share the part number and tell us if they were good or bad. Thanks.

[ur20v]

I have used both Bosch and Delphi and a few others, they are all the same - keep the plugs fresh and gapped correctly and they last, get a bad plug, to big a gap etc, the extra load sees the coil off very quickly due to the high loads and temps.

[Used2be]

Originally Posted by ur20v

I have used both Bosch and Delphi and a few others, they are all the same - keep the plugs fresh and gapped correctly and they last, get a bad plug, to big a gap etc, the extra load sees the coil off very quickly due to the high loads and temps.

I don't know what the OEM spark plug is, but after looking around it seems to me that the NGK 97506 iridium center and platinum ground is the plug I'll use. Denso has what they call an iridium plug, but it has a nickel ground electrode. Thanks for your input.

[ur20v]

I was talking coils but Bosch is the OEM provider of plugs for certain but a lot of tuners like BMS etc use equivelent NGK or slighly colder heat range with success on high out put tunes - apart from Allmotor most here aren't pushing the limits other than plug gaps.

[allmotor_2000]

Running 1-2 ticks colder helps...

[m5james]

At what power levels do you recommend going colder? I'm about 100hp over stock myself.

Edit - just answered my own question. Can you tell us the part number of the colder plugs?

[TheHouseWon]

12120039634 = Stock

12120039664 = Ngk 97506 2 steps colder

[m5james]

The article says 75-100 should go one step colder so I'd like to find one step colder before jumping to two steps. Thanks for posting that :-)

[TheHouseWon]

Originally Posted by m5james

The article says 75-100 should go one step colder so I'd like to find one step colder before jumping to two steps. Thanks for posting that :-)

12120035531 = ngk 5992 1 step colder.

You'll want to verify before buying, but I'm sure these will work

[m5james]

Between tune, downpipes and soon I'll be adding JB4 & BCM with meth, is it better to do colder plugs, tighter gaps or both?

[TheHouseWon]

Originally Posted by m5james

Between tune, downpipes and soon I'll be adding JB4 & BCM with meth, is it better to do colder plugs, tighter gaps or both?

The article you posted says to err on the side of colder plug so having a 2 step colder plug wouldnt be as bad as keeping the stock ones with mods. Gap is .020-.022.

Can a tuner or heavily modded car confirm this? BPMSport

@allmotor_2000

[13M5F10]

Originally Posted by TheHouseWon

The article you posted says to err on the side of colder plug so having a 2 step colder plug wouldnt be as bad as keeping the stock ones with mods. Gap is .020-.022.

Can a tuner or heavily modded car confirm this? BPMSport

@allmotor_2000

I was running N55 plugs which are colder than the S63TU plugs gapped to to .018.

[m5james]

Originally Posted by TheHouseWon

The article you posted says to err on the side of colder plug so having a 2 step colder plug wouldnt be as bad as keeping the stock ones with mods. Gap is .020-.022.

Can a tuner or heavily modded car confirm this? BPMSport

@allmotor_2000

Too cold has the downside of fouling sooner, but I hope the JB4, BCM and meth will justify two steps vs one step.

[m5james]

Originally Posted by 13M5F10

I was running N55 plugs which are colder than the S63TU plugs gapped to to .018.

I'd assumed they ran the same plugs...how much colder? That seems like a tight gap, isn't there such a thing as too tight? What mods?

[13M5F10]

Originally Posted by m5james

I'd assumed they ran the same plugs...how much colder? That seems like a tight gap, isn't there such a thing as too tight? What mods?

The F10 (non-M5) runs the same plug as the N55 but the M5 is different.

Mods are in my signature

[m5james]

I was on mobile so I didn't see signature, sorry. Hopefully HCP/Halim has a stage 3 as well or at least in the works since I'm happy with his stage 2.

[boots]

Originally Posted by m5james

I was on mobile so I didn't see signature, sorry. Hopefully HCP/Halim has a stage 3 as well or at least in the works since I'm happy with his stage 2.

I told ya his tune is the shitznic

[m5james]

Originally Posted by 13M5F10

I was running N55 plugs which are colder than the S63TU plugs gapped to to .018.

These happen to be NGK's like the ones mentioned above, something different and would you know what makes them different, any issues running them, etc? I just don't wanna buy $120 worth of plugs when I could get $80 worth and get the same results.

[13M5F10]

Originally Posted by m5james

These happen to be NGK's like the ones mentioned above, something different and would you know what makes them different, any issues running them, etc? I just don't wanna buy $120 worth of plugs when I could get $80 worth and get the same results.

Yes, they are NGK plugs... it's hard for me to say that the plugs made a difference since I changed to N55 plugs from day one after talking to George (MSR) and Mo (DME). It's always been a rule of thumb that when you raise boost, you'll want to go a step colder on the plugs. I'll say that from day 1 my car ran like a champ with no issues. Wish I kept the logs. I did notice when changing plugs between intervals, the N55 plugs looks amazing compared to my stock with the same miles.

Regarding cost, should be able to get these for about $80 as well. Dealer pricing or online. I'll see if I can find the link.

Here is a excerpt directly from NGK

when compression is raised, along with the added power comes added heat. Since spark plugs must remove heat and a modified engine makes more heat, the spark plug must remove more heat. A colder heat range spark plug must be selected and plug gaps should be adjusted smaller to ensure proper ignitability in this denser air-fuel mixture.

[m5james]

So long as it's not required to be a fancier plug like w/ an ///M logo like what comes stock (and the adjusted price to go with that logo), I'll just search for N55 plugs and gap them down to .18

I'll go a step colder for now since I've yet to install the JB4 and use it as a meth controller. Once I go meth and start upping boost above and beyond my stage 2 tune, I'll go two steps. Thanks

[m5 guy]

Some good info here. Going to remember this thread when I get my tune. Thanks guys.

[m5james]

2 steps colder plugs in the mail directly from BMS, cost $127 shipped...I couldn't find them cheaper.

HCP/Halim stage 2 tune only, no issues.
HCP with JB4 map 1, no issues.
HCP with JB4 map 2, initially was great, adjusted FF from 0 to 30, which has then self adjusted itself up to 100 and misfires coupled with CEL and Reduced Power start happening.
HCP with JB4 map 3, ditto of map 2 but it happens faster.
HCP with JB4 map 6, custom adjusted to 21psi...total monster so long as I feather the throttle enough to keep the misfires from happening.

I still haven't seen a link for ignition coils themselves short of going to the stealership. I have seen a link for the S63TU that's coils and plugs but I don't recall any reviews.