J-Rat

iTrader: (2)

What is the reasoning behind running all 9s for high boost application? Would this be beneficial even if the car is a daily driver (stop and go traffic)? Conversely, is there a better plug configuration for racing (I drift, nice long passes hung on the redline).

Also, what is everyones impressions of EQPs? I have heard that platinum plugs are not recommended for boosted applications, due to the fact that the electrode holds more heat. Anyone else heard this?

Thanks in advance!

Rat-ta-tat-tat

RETed

I recommend all 9's for even daily drivers.
Only the most extreme stop-n-go driving would foul all 9's.

Plats do not promote better performance.
The plats just offer longer spark plug (electrode) life.
You can look-up electrical conductivity tables, and Pl makes a crappy conductor.

Anything colder is a big jump in price.
Ever price NGK 10.5, 11, or 13's?
You'd get sticker shock.

The other option is the motorcycle B10EV's.
Check out the other thread in the Rotary Performance(?) section.


-Ted

J-Rat

iTrader: (2)

Can you give me your reasoning behind recommending all 9s?

RETed

9's in the leading positions just last longer.
We easily pay over $5 each for these plugs, so having longer spark plug life makes things cheaper for maintenance.


-Ted

J-Rat

iTrader: (2)

So there isnt any performance issues involved? Expecially on higher boost applications? I agree on the cost, but cost isnt a big issue with me.

RETed

I don't normally run the engine to the ragged edge, so I don't normally see the ignition break-up associated with too-hot spark plugs.

On big power 13B's (400+), I heard the NGK 10.5's make significantly more power (+30hp was the number I heard) due to the colder plugs.

I've never tried back-to-back testing of different heat range spark plugs on the dyno myself.


-Ted

J-Rat

iTrader: (2)

So what your saying is, it would provide some cushion against ignition breakup? This would be due to its ability to shed more heat I assume..

(thanks for letting me pick your brain)....

RETed

Yes, basically.


-Ted

drago86

I run all 9's on my NA, no problems at all. It makes the leadings wear out slowly like the trailings. I'm going to try some 9 ev's as soon as my car is up and running again/ broken in.

J-Rat

iTrader: (2)

I was thinking from a boost perspective, but If it works for an N/A too, then good..

boosted1205

iTrader: (9)

Jrat, you might to try these. The B10's are very good plugs for street are less prone to fouling than the BUR's if you are using premix. These are motorbike plugs and the "B's" are 14mm 13/16 hex. There are "C" and "D" but it won't fit due to different threads. The letters after the heat code are either plat. or iridium. It gives a solid idle and smooth to redline. It's being used on a TO4E at 12 psi and it lasts longer than the BUR's. If there are heat colorations on your threads, you need colder plugs.
The 10's should be more than enough. I've used the B9's and it seems too hot so went 1 number colder.
You also need thin wall sockets to install these.

BLUE TII

iTrader: (9)

BR10EIX is the Iridium snowmobile plug that works great and is ~$7 a plug. That is what I use.

Do a forum search on it if you are unsure- you will see it has quite a following.

J-Rat

iTrader: (2)

Now this is good stuff... Anyone else?

*edit* And I am premixing...

boosted1205

iTrader: (9)

You're not going to find too many experimenting with spark plugs unless you're a bit hard core
I had a chance to pick Rob's (Pineapple Racing) brain some time ago as he mentioned being from Hawaii. He loves to talk on the phone about rotaries.
He recommended I try the B10EGV gapped at 28.