Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum - View Single Post - High HP SR Spark Blowout....Discussion/Solutions

*fliprayzin240sx* · 05-23-2010, 06:54 AM

Thats what I was gonna say, a good rule of thumb is for every 100hp above stock, you go down another heat range with NGKs. Stocks are 6s at stock 180 whp ish. You are way more than double that, I'd go down to 8s and gap them down to .030. If its blowing out, start tapping them down closer to .025 if need be. I've got a guy out here thats been building SRs for over 20 years. He said from his personal experience, stock OEM coilpacks/igniters can handle up to 600hp with no issue. No point of upgrading coilpacks.

On my GT3582 at 1.8bar, I'm still running stock S15 coilpacks with NGK Irway Iridiums 9s. Already came pregapped at .030 so I never touch them. Only fucking catch is they cost like $25 a pop out here with the shitty exchange rate. Will probably order some copper plugs and see if they work just as good. Figured if coppers work, I'll just change them more often like I used to do in the states (roughly every other oil change but they only freakin cost 1.25 per plugs).

05-23-2010, 06:54 AM	#6
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19)	Thats what I was gonna say, a good rule of thumb is for every 100hp above stock, you go down another heat range with NGKs. Stocks are 6s at stock 180 whp ish. You are way more than double that, I'd go down to 8s and gap them down to .030. If its blowing out, start tapping them down closer to .025 if need be. I've got a guy out here thats been building SRs for over 20 years. He said from his personal experience, stock OEM coilpacks/igniters can handle up to 600hp with no issue. No point of upgrading coilpacks. On my GT3582 at 1.8bar, I'm still running stock S15 coilpacks with NGK Irway Iridiums 9s. Already came pregapped at .030 so I never touch them. Only fucking catch is they cost like $25 a pop out here with the shitty exchange rate. Will probably order some copper plugs and see if they work just as good. Figured if coppers work, I'll just change them more often like I used to do in the states (roughly every other oil change but they only freakin cost 1.25 per plugs). __________________ If you think Zilvia has too many assholes... CLICK HERE!!!