what do you guys prefer? most likely goin with ngk i need new ones. was wondering if the platinums are alright and if there is a better choice?

 

NGK - B10EGV

 

As fast as they wear out, I wouldn't bother with the platinums.. However, just my opinion.

Order them from http://www.rockauto.com/ . You can get them in bulk at really good prices.

 

^^ those are NOT compatible with the HKS twin power

 

You'll have to explain that one as I've seen many guys using the non-platinums with ignition amps for years without issues.

 

I use the NGK R6725-105 in trailing and the NGK/Trust racing plugs in the 9 heat range in the leading.

I only do this because I tend to wear down standard spark plugs VERY fast (my boost controller is set to 14psi and 18psi, both daily driven)... the race ones seem to hold up well, given that punishment.

 

NGK B9EGV is what i run all around. i get them at oreilly's and they come out cheaper then stock. $4 something each.

I heard that HKS recently came out and said the twin power is not compatible with non resistor spark plugs, even though a lot of guys have been running them for a long time that way.

Here is its right after "note"
LINK http://www.hksusa.com/products/more.asp?id=838

I think some boxes were popping, but idk what the likely hood of it is or any details behind it. I really like the NGK B9EGV's though.

I run a twin power.. haven't had any problems so far. "knock on wood", i am a bit nervous though when i think about it...

 

I think non-resistor plugs make the twin power run hotter so if it doesn't get fresh air, there's a chance of it frying. I remember reading somewhere that Steve Kan fried some twin powers while tuning with non-resistor plugs.

thewird

 

when I page thru the RX7 magazines and hyper rev

they're always promoting those Race type plugs.. with the electrode that runs across and into the middle

in some of the articles they also list it as an early mod to do..

where as the american tuners tend to use stock colder plugs instead..


any ideas?

 

Sounds like stories surrounding the "synthetic oil" debate...

However, the standard and platinum plugs are the same construction aside from the electrode and disc material. So I'm assuming that comment was made in reference to the post on the B10EGV's. which IIRC are non-resistor plugs.

 

I use Denso iridiums and love them, they don't load up nearly as much for (light throttle) daily driving and reportedly generate a more powerful spark with less energy (my opinion is the TP is a band aid for less than 400 hp, and above that you need upgraded coils)

I'm not sure how long they will last just yet...

 

No one asked how modified the OP's car was.

Also, I resisted running a twinpower for years, but after finally junking my jacobs amp and installing the HK$ unit, I was very very happy. Money well spent.

 

On a mildly modded setup, i think all 9s should be fine.

I have a handful of mods but i run the stock 7 and 9s. This year i ran the non-plats and didnt find any noticeable different from the plats of last year. My driving habits didnt change, my use of the car didnt change and it felt the same.

Well ill find out when i pull them out for the next change which is in about 4-5 months (i change them once a year).

 

the twin-power requires resistor plugs or at least that what it says on hks webpage.

I use BR10EIX gapped at 0.30

 

i run the B10EGV with a twin power and have been running them for about 3-4 years with not issues. my car is not daily driven and it is not stock. i have no ignition break up.

 

I've been running the b9egv's for about a year with the twin power, my car is driven on an almost daily basis. No issues so far. And yes the NGK EGV series are non resistor plugs, and i much more prefer them over the stock ngk's. It would be nice to find out exactly why HKS says to use the resistor type plugs as they never used to say not to.

 

this is an excerpt taken from a dodge stealth website on spark plugs.

"Resistor spark plugs
The standard spark plug used in modern engines, including the 6G72 engine, is a resistor-type spark plug, which is indicated by the letter "R" under the NGK letters stamped on the insulator. A 4,500 to 5,000-ohm ceramic resistor is built into the spark plug core to suppress spark-generated electromagnetic noise that can interfere with the car's on-board electronics and radio signals"

I also read that some spark plug wires can have a resistor built into the plug cap, and that you shouldnt run both a resistor plug cap and spark plug or it will reduce the spark energy.

I'm guessing that running a non resistor spark plug would make for a hotter spark, but maybe the reduced resistance pulls more current from the twin power causing it to exceed its limits in some cases.

I wonder if resistor plug caps, or resistor plug wires (if they make them for rotaries) could be used with non resistor spark plugs. Though as i already stated i haven't had any problems so far.

EDIT: more information taken from NGK's website

Frequently Asked Questions

Q: When should I use a resistor spark plug?

A: NGK "R" or resistor spark plugs use a 5k ohm ceramic resistor in the spark plug to suppress ignition noise generated during sparking.

NGK strongly recommends using resistor spark plugs in any vehicle that uses on-board computer systems to monitor or control engine performance. This is because resistor spark plugs reduce electromagnetic interference with on-board electronics.

They are also recommended on any vehicle that has other on-board electronic systems such as engine-management computers, two-way radios, GPS systems, depth finders or whenever recommended by the manufacturer.

In fact, using a non-resistor plug in certain applications can actually cause the engine to suffer undesirable side effects such as an erratic idle, high-rpm misfire, engine run-on, power drop off at certain rpm levels and abnormal combustion.

 

Tell HKS that, not me.

 

+1 on the b10egv. when i was getting my car tuned i was having ignition breakup with 9's all around but then once i changed them out no breakup at all. no twin power used either

 

 

i have close to a 300hp fd with 99' seq twins, no twin power, just pettit intake. sounds like the b10egv's are decent

 

likewise because i get these at nappa and $35 for a set of 4!

 

what do you gap the b10egv's to?

 

For that, just run either all 9's or the stock setup (7's & 9's).