Plugs for supercharged car

warrior · Post by **warrior** » Tue Feb 04, 2014 3:28 pm

I have been running NGK BKR7E v-power plugs in my supercharged car, it runs 10psi.

One just went and died on me and I need new plugs. What are you turbo guys using and what gap at you running them at?

I am happy to buy the best plugs available if they will last a little longer.

Post by **jif** » Tue Feb 04, 2014 4:15 pm

hey Warrior... ran the NGK platinum plugs with the standard gap, 1 step colder on the turbo'd na8 ... no problems ever. A++ would buy again :)

On 4 February 2014 15:28, warrior <mx5talk@mx5forum.co.nz (mx5talk@mx5forum.co.nz)> wrote:

I have been running NGK BKR7E v-power plugs in my supercharged car, it runs 10psi.

One just went and died on me and I need new plugs. What are you turbo guys using and what gap at you running them at?

I am happy to buy the best plugs available if they will last a little longer.

------------------------
warrior

[Posted via external email]

Angreal · Post by **Angreal** » Tue Feb 04, 2014 4:17 pm

I'm running whatever plugs the car probably was built with and it runs the charger fine. Only running 5 pounds with cams

warrior · Post by **warrior** » Tue Feb 04, 2014 5:33 pm

ok, have decided to spend the money and go with the iridium. they are BPR7EIX they are the right plug and the correct heat range.

Any ideas on the cheapest place to buy them?

They have them on trade me , pickup just around the corner for $23.99ea (ouch)

broomfish · Post by **broomfish** » Tue Feb 04, 2014 7:14 pm

I have them available at $23 each
Use the MX5FORUM code in the "how did you hear about us" box and get 10% off that. If the order is over $80 you get free delivery

http://www.broomfish.co.nz/product_info ... ts_id=2128

warrior · Post by **warrior** » Tue Feb 04, 2014 8:26 pm

Hi Peter,
where are they? cant seem to find them? What section are they in?

warrior · Post by **warrior** » Tue Feb 04, 2014 8:32 pm

Hi again,
followed the link and got to the plugs, does the 10% come off after I have confirmed the sale as I cant see the " how did you hear about us" box.

Once you have confirmed I will buy these.

Thanks.

warrior · Post by **warrior** » Tue Feb 04, 2014 8:37 pm

Went ahead with sale but was charged the $4.00 delivery fee (but was over $80.00) and did not see the 10% discount box? Please let me know what I need to do.

broomfish · Post by **broomfish** » Tue Feb 04, 2014 9:08 pm

The 10% discount is applied permantly when you create your account, so you automatically get it on each order.
It seems the free shipping was set at $80 +gst. I have changed to to $70+gst.
I have modified your order and removed the shipping so the total to pay is $82.80.

MrGrey · Post by **MrGrey** » Tue Feb 04, 2014 9:28 pm

you're a good bugger broomy

WideOpenThrottle · Post by **WideOpenThrottle** » Tue Feb 04, 2014 9:32 pm

I run a 0.80mm gap on my turbo car at 9psi

warrior · Post by **warrior** » Wed Feb 05, 2014 10:22 am

Thanks Peter, I will deposit the $ on Friday. Cheers

warrior · Post by **warrior** » Wed Feb 26, 2014 6:35 pm

What gap should I be running on the platinum plugs in the supercharged car? I was running a .32 with the old plugs.

To small of a gap for the better plugs?

Ideas please

broomfish · Post by **broomfish** » Wed Feb 26, 2014 8:13 pm

It is not recommended to regap precious metal plugs such as platiunum or iridium plugs. I suspect this is because it may damage the precious metal coating on the tip and electrode. The BKR7EIX have a preset gap of 0.75mm (30 thou)

Post by **jif** » Thu Feb 27, 2014 9:47 am

IIRC - smaller gaps are for where you'd have trouble sparking with a bigger gap. Iridium/platinum sparks more easily than regular plugs, so I'd not make the gap any smaller unless absolutely necessary.

If you're still running a wasted ignition (ie stock) one of each of the plug pairs will be firing backwards, so you'd really want the plugs with plat/Ir on both electrodes. eg PFR7A-11 , which ran flawlessly for the turbo. Stock gap is 1.1mm

Hope thats correct ... its been a while.

http://www.miata.net/garage/KnowYourCar/S2_Plug.html

[Posted via external email]

marcellarius · Post by **marcellarius** » Thu Feb 27, 2014 9:57 am

If you're using the factory waste-spark ignition, single electrode iridium or platinum plugs will have a shorter life than expected because in each pair of plugs, one spark is positive, the other is negative, which will cause the side electrode to wear faster on 2 of the plugs.

SLYDIT · Post by **SLYDIT** » Thu Feb 27, 2014 6:32 pm

you guys and ya flash plugs! whats wrong with good ols zfr7f or BKR7? both come pre gapped at .8 and are cheap as chips.. i'm on my second set of plugs in 8 years.

warrior · Post by **warrior** » Thu Feb 27, 2014 8:08 pm

One of my "cheap as chips plugs" did not work anymore after two months.

That's why.

Teamjelly · Post by **Teamjelly** » Thu Feb 27, 2014 9:53 pm

Best plugs for the MX5 (and most engines) are
NGK Resistive BKR7E

Anything else is a waste of time and money - and won't work anywhere near as well.
Any decent turbo or supercharged car that comes in for tuning with platinum or similar plugs get changed first thing

Countless times I've have spark blowout or misfiring using platinum/Iridium plugs, that gets fixed right away by replacing cheap copper plugs.

Try and find a race team that doesn't use copper plugs, as they conduct better than anything

Best thing of all - is they are only about $6 each from SUpercheap

If you engine is chewing them out, then there's something else afoot.

warrior · Post by **warrior** » Thu Feb 27, 2014 10:15 pm

I did not say my engine was chewing them out, one plug went bad.