Hondata

You need to use resistor spark plugs. See http://www.hondata.com/techksparkplugs.html

Appropriate NGK part numbers:

BKR8EIX #8 Stock# 2668
BKR9EIX #9 Stock# 2669
R6601-10 #10 Stock# 4017

How should we judge what heat range to use?

And are these the plugs you would recommend, ie iridium plugs?

Awesome! I just discovered this as well. I have been using non-resistor plugs on my current set-up and have been having a misfire that has been driving me crazy. I hope this fixes it. I don't like using iridium plugs in a high hp turbo car though. I have had the iridium come off of the plug(in a well tuned car). I was told to use # 6097. Courtney green uses them in his 9 second car with no problems.

As far as what heat range to use, I have always heard go a step colder for every 100hp. It has always worked good for me.

What if the ignition system we are using, recomends Non-resistor plugs??
Im using a M&W pro10 ignition, this setup eliminates the factory ICM.

Straight from M&W's site.

IGNITION LEADS & SPARKPLUGS
Do not use straight metal wire or carbon ignition leads. For best
performance use leads with a premium quality silicone jacket and spiral
wound metal core construction. Do not use resistor type spark plugs.

Thanks guys.

2 0 3 wrote:What if the ignition system we are using, recomends Non-resistor plugs??
Im using a M&W pro10 ignition, this setup eliminates the factory ICM.

Straight from M&W's site.

IGNITION LEADS & SPARKPLUGS
Do not use straight metal wire or carbon ignition leads. For best
performance use leads with a premium quality silicone jacket and spiral
wound metal core construction. Do not use resistor type spark plugs.

Thanks guys.

I run an M&W Pro 10 as well. I was not aware of this though. I was hoping that this had something to do with the misfire i am experiencing.

Use of non-resistor spark plugs results in a voltage spike travelling back down the ground path to the ECU. This can be 200V or greater. Never use non-resistor spark plugs.

Hondata wrote:Use of non-resistor spark plugs results in a voltage spike travelling back down the ground path to the ECU. This can be 200V or greater. Never use non-resistor spark plugs.

Thanks! Maybe this is the answer to my issue.

i tried resistor plugs and the car missed so bad it would hardly run. put the non resistor plugs back in and it ran almost perfect

THe fact that the spark plugs had resistors was not the issue....either you had them gapped incorrectly or there was some other issue involved.

could it be that they are not needed for the m&w ignition box?

Hey turbotypeR ,

qhat plugs are you running now ? I see you tried resistor plugs and it didnt work out, was it the gap or heat range ? Or did u end up going back to non resistor ??

We made 560whp last weekend on non resistor ngk 8's
Im about to switch to some iridium 2668's and retune for more power...

just curious what you ended up doing. may save me some diag time on the dyno. thanks

i find that if i have a car that seems to have bad ignition/fire issues 9 times out of 10 it's becasue they are not ngk plugs, not stock honda wires or ngk wires, not stock cap/rotor. if using msd ignition then ngk plugs not being used or msd bad.

replacing any or most of these to ngk/stock/new msd always fixes the issue.

What plugs would you use for a JDM B16A1? No one around here seems to know anything about this motor which makes finding parts a little hard.

same as any other honda.. what you need to know is what heat range you need..

How do you figure that out in honda's