Okay, all of you who have popped for the new Greddy turbo, here is something you should invest in. Denso has plugs for engines running FI or with some sort of engine mod. It helps prevent against pinging and fowling....check em out at www.sparkplugs.com

I got some and they make a good bit of difference. I can manipulate my AFR really close to 14.2 without any pining...cooooooooool!

 

good find

 

Interesting. Thanks for the info. I actually put in a set of NGK/Mazda RE8A-L spark plugs (leading & 1 heat range colder). I wonder if I can/should mix brands & get the Densos for the trailing units. Definitely good to know for the future.

 

My understanding is that there is not going to be any trouble with the mixing of plugs...however, different companies use different "terms" for what is colder. So, you may end up with plugs running at very different temps...that could be bad...you would run fowl and two or normal on two and ping on two..

Just my 2 cents.

 

ok not to sure but would any of these work and if so which one???

DESCRIPTION TYPE HEAT PCS. SPL NOTES PART#
PRO ROTARY SPARK PLUG RE 9 1 for Rotary Engines 13000149
PRO ROTARY SPARK PLUG RE 10 1 for Rotary Engines 13000150
PRO ROTARY SPARK PLUG RE 11 1 for Rotary Engines 13000151

 

Here are the part numbers from www.sparkplugs.com for the "cold" plugs.
Denso*Iridium Racing*5753*IRT01-34*One heat range colder Trailing
Denso*Iridium Racing*5755*IRL01-31*One heat range colder Leading

 

the above that i posted was from the greddy site was just wondering if they would work

 

I know nothing about the Greddy stuff...but if they are advertising for them...then they must work.

 

i got a call from greddy today they said that they will NOT work with the 8 but are working on a pair

 

I noticed that an RX7 runs the same 7-leading and 9-trailing heat ranges. This model is already used in a boosted application. 7-leading and 9-trailing... when does the Rx7 have to step into a colder spark plug? I had the same concern a while ago regarding stepping up to a colder plug (had some help from Mazdamaniac...thanks again!).

 

hey i know this is a super old thread bu id hate to start a new one to ask a question...

im going to be changing out my plugs, wires and decided to go ahead and swap out the coils aswell...(might as well lol)

im looking at getting plugs and i was interested in what else is available, i read that stock plugs are the way to go. i was looking at denso iridium plugs and was wondering if this would be another way to go. heres the thing tho...

i have a HKS ignition amp and was hoping to get plugs that would last longer with the amp, after reading between platinum and iridium, iridium seems to be stronger by comparison. im confused as to what stock are because they seem to be listed as platinum but people here say oem is iridium.

another question i have is with colder plugs...i kno they are traditionally for boosted applications, i plan on getting a piggy back and am going to get it tuned...i kno with colder plugs you get more flexibility to tune the car and can work with issues like pinging better. Can i use a colder plug in order to tune the car a lil more aggresively even tho im NA, will the initial loss of power colder plugs usually give be ofset by more gains of the tuning?

Please let me know what you think, i look forward to insightfull suggestions.

btw im at 70k, with the plugs changed at dealer at 45k...i say im due pretty soon.

 

i was gonna do the same thing, but everyone on here does say that the stock plugs are iridium, but then they recommend the plugs on mazsport, but those are platinum, and as far as i know iridium is better than platinum, so whats that all about?

But for you, i would say that colder would be better for tuning.

 

yea im still searching but having a hard time figuring out if the oem are plats or iridiums, im getting alot of mixed reviews...

any other ideas if i could/should go with a colder plug for more aggressive tuning?

and would iridium be best for the HKS amp for more longevity of the plugs?


please let me know, i plan on buyin monday to hopefully get it by thanksgiving weekend

 

The OEM ones are iridium centers with platinum "finewire" ground

 

The problem with lesser metals is that the less dense the metal is the more quickly it is vaporized.

So iridium>platinum>copper

as far as longevity.

You could use copper plugs, the only thing that is essential is the shape of the plug. the materials used only factor in on how long the plugs will last.

 

thanks for that explanation static, good to know about the oem plugs and thanks for the explanation on copper-plat-iridium....

any other advice suggestions???

 

they should put gold in our plugs, since they already cost a fortune, and gold is the best electricity conducting metal

 

i hear ya copper plugs on my maxima were like 2 bux each..plats were like 6 and iridium was like 9...i got a set of 6 for like 64 bux shipped or somethin...but thats 6 plugs...

 

any other advice

 

but its also very soft plus it will NOT be able to withstand the heat.

 

i know that. BUT, what about an alloy of gold and iridium? nvm

 

com
on guys I really need to know if cold plugs are gonna be worth it for the tuning let me kno

 

depends on the plug but usually colder plugs are a necessity

 

I had some problem running colder plugs with my FI thats why im switching back to the RE9B & RE7A