Which spark plugs are really the best?

[TME_Steve]

Well misfires now every time I go past 18.5 psi, and massive ones at that, I think I scared the crap out of some poor Hyundai owner when I nailed it on a speed limit change and accelerated like 19psi does for 1000RPM and then poured raw fuel out the exhaust when the miss occurred. the hyundai got lost in the resulting black cloud. Tomorrow the boost will be dropped to 18psi max as I don't think ignition cuts are the best thing in the world. We'll see how long it takes for the plugs to deteriorate so they blow out at that level....

Oh and Christian, Monday I can trial fit the Exo X coilpacks.

 

[naughtika]

Well misfires now every time I go past 18.5 psi, and massive ones at that, I think I scared the crap out of some poor Hyundai owner when I nailed it on a speed limit change and accelerated like 19psi does for 1000RPM and then poured raw fuel out the exhaust when the miss occurred. the hyundai got lost in the resulting black cloud. Tomorrow the boost will be dropped to 18psi max as I don't think ignition cuts are the best thing in the world. We'll see how long it takes for the plugs to deteriorate so they blow out at that level....

Oh and Christian, Monday I can trial fit the Exo X coilpacks.

That would be awesome.. Are u just test fitting it or buying them?

 

[TME_Steve]

I'll test fit one, if it fits I'll buy one to test fit in the rear bank

 

[twisted32]

How do they secure though Steve?
I didn't think the rear bank had any provisions for mounting coil packs.

 

[TME_Steve]

Yeah I was wondering what we would do there too.... I was hoping Christian would have a good idea, but I am sure we can come up with some mounting method that will work.

And today, I wouldn't say it missed but it felt a bit not quite right at 16psi....

 

[Macca]

I don't suppose you could fit another front rocker cover on the rear head? It will look weird but you cant see it anyway. That will give you somewhere to mount the coil packs.

 

[naughtika]

Yeah I was wondering what we would do there too.... I was hoping Christian would have a good idea, but I am sure we can come up with some mounting method that will work.

And today, I wouldn't say it missed but it felt a bit not quite right at 16psi....

I'd secure it using the 3 bolts holding down the coker cover.. that bolt itself is quite long, enough to hold another 2-3mm of plate.. once all measurements are taken I/we should be able to mount the COP on the plate and secured using a nutsert..

 

[TME_Steve]

Back on topic, my copper 7's are pharrrrrked. Now down to 16psi and starting to have misfires, that was what 2 weeks? so that's about 1500km and they are stuffed. So as soon as I get time (I'm now damn busy with some other things in my life) I'll put a set of 8's in....

Christian, sending you a PM on coil packs....

 

[naughtika]

so Coppers are no go..

but how does the evo owners manage to use the copper and last for quite a while?!

 

[TME_Steve]

Copper 7's are no go, maybe 8s will be OK, which would suggest that 7 iridiums may be wrong also....

(Hopeful)

 

[naughtika]

Iridium 8's?!

why is it BKR8EIX is used on RB25DET Neo?

 

[TME_Steve]

And evo's run 8s as well

Down to missing at 15.2psi.... So boost is now set at 14.5.... It's a slow car now It also surges around 1500-2000RPM at really light loads but I'm also playing with fuel AFR;s down there so it could be that too, I'll leave the fuel maps and change the plugs to find that out. I need to get 8's in it and I'll try to do it as soon as I can but it may be a couple of weks before I get the chance....

I think also as Rob suggested, once we sort out the heat range I'll probably try either the denso plugs with the platinum electrode and the iridium tip or the NGK Laser iridiums.

Also noticed their tips are thinner on the denso's which is theoretically a good thing.

 

[naughtika]

thought Denso's use actual Iridium tips.. rather than iridium dipped tips? like what NGK.. I dont know if these are facts, but I believe I read it somewhere..

 

[TME_Steve]

I'll research it before I get a set then....

 

[twisted32]

From the research I did:
Denso IK series iridium tip only equivalent to NGK IX's
Denso VK series iridium tip and centre electrode (iridium welded on not dipped I believe on the tip, not sure on the centre electrode)
NGK laser iridiums, iridium tip, platinum centre electrode.

 

[Bennoz]

The fellas that tuned my car only use Platinum. They reckon the Iridiums are rubbish, so they put NGK Platinums in, gapped at 0.7mm. Good for 250 front wheel killerwasps.

 

[naughtika]

Denso VK22 are Iridium Electrode and Platinum Ground

where as

NGK BKR7EIX, it's only got the Iridium Electrode and standard(?!?) ground probably why it melts too quickly..

 

[twisted32]

I stand corrected (once I checked my info), VK series, iridium tip, platinum ground, see here:
http://www.globaldenso.com/en/products/aftermarket/plug/tough/structure.html

 

[Guest]

how about denso plugs? from denso catalogue it says that VK22 is our alternative for the BKR7EIX

or VK20 for the BKR6EIX

I'm gonna order about 3 sets.. anyone else want some?

Chris - did you order these? VK20 or VK22? I'm keen for a set of VK22 so if you have a spare set pm me

 

[TME_Steve]

Even at 14 psi the coppers are starting to play up, not so much a big blowout miss but like a on off hesitation, barely perceptible but it's there.... I just need time to change them....