Which Spark Plug to get ?

Nubira2.2 · Post by **Nubira2.2** » Mon Jan 08, 2007 8:51 pm

I want to know which spark plug to get for my
T22SED since im going to boost it

One step Colder

It would be perfect if u give me part #

thanks!

GsiTurbo · Post by **GsiTurbo** » Tue Jan 09, 2007 5:14 am

I would go with NGK BKR5EIX for up to 15psi boost, and BKR6EIX for over 15psi. This part num is NGK iridium plug, as used in Astra VXR.

Nubira2.2 · Post by **Nubira2.2** » Tue Jan 09, 2007 5:20 am

thanks tom!

Nubira2.2 · Post by **Nubira2.2** » Tue Jan 09, 2007 7:03 am

well did a search of my own

finded out this ...

checking the desing symbol of the standard (BKR6EK) plug and
the iridium (BKR5EIX) plug ...

the iridium is one range hotter than the standard, is it due to the iridium?

if the oem range is 6 should i look for a range 7?

comparing with Subaru Impreza WRX it uses the BKR6EIX plug

since i will have no timing control it is very important for my engine to minimize
all chance of pre-ignition and detonation

reading NGK tech info the heat range has a lot to do with it

for now the BKR6EIX is winning

MMamdouh · Post by **MMamdouh** » Tue Jan 09, 2007 7:24 am

GsiTurbo wrote:I would go with NGK BKR5EIX for up to 15psi boost, and BKR6EIX for over 15psi. This part num is NGK iridium plug, as used in Astra VXR.

as per the NGK chart, the BKR5EIX is already one step hotter than the OEM recommended spark plug... won't that be bad for the engine??

i'd be looking for an NGK spark plug with heat range of 7 if i am under boost conditions.

MMamdouh

ubuyau · Post by **ubuyau** » Tue Jan 09, 2007 11:39 am

MMamdouh wrote:i'd be looking for an NGK spark plug with heat range of 7 if i am under boost conditions.

MMamdouh

+1. Going one step cooler did give a better feel under full throttle.

--Tim