Spark Plug Gapping

[binga85]

I'm sure this has been covered, though I'm on my phone and I'm restricted searching.

anyway.....

changed my plugs yesterday to the NGK iridium bkr7ex and it's missing under WOT 6000rpm +

Any advise as to what i should gap the plugs to??

currently doing around 320awkw at 16psi with 1000cc injectors

thanks

Edited March 2, 2012 by binga85

[SargeRX8]

.8mm

[Hanaldo]

26's are easy enough, so just keep gapping it down until it stops. I'd start with 0.8mm as Sarge said. Mine had to be gapped down to 0.6.

[binga85]

Thanks guys, im pretty sure these are standard 1.1

[Black_CSR]

If it was a 1.1mm gap the end of that part number should be 11, so bkr7ex-11 it would say. So by default bkr7ex would be already gapped @ 0.8mm. Gap it down to 0.7mm.

[GTRNUR]

Your air-fuel ratio's will play a big part in your success or failure here. If your fuel ratio's are dipping deep into and past the 11's, then 0.8 won't be enough. Aim for 12:1. Transitions can be tricky with big injectors too. Really for that power you only need 550cc's.

Plug gapping to fix this is really just a bandaid to cover up the fact the tune is too rich. 6 heat range is fine for 320kw too, there is no benefit in going to 7's or super cold race plugs. In fact a hotter plug will foul less.

[Hadouken]

I run 6's gapped to 0.8 splitfire coilpacks 300kw 18psi no misfire

What coil packs do you have? Maybe try are breaking down!