What spark plug for BWR supercharger? - LotusTalk

s4norice · 07-19-2009, 07:27 PM

I am installing a BWR Supercharger. I want to change the spark plug at the same time. So what spark plug should I use?

Westrock · 07-20-2009, 03:29 AM

When I installed the VF kit I went with one range cooler iridium plugs. Part number was NGK Iridium IX BKR7EIX-11. While it seemed safer, the engine was sluggish at idle. So using a trick I learned from previous forced induction cars I went back with the stock plugs, but I gapped them down 0.035" (from stock gap of like 0.050"). The engine idle'ed good again and I didnt worry about spark blowout, which becomes a bigger problem as boost and RPM increase.

Dragon · 07-20-2009, 06:57 AM

NGK BKR7EIX-11's in my car with a BWR supercharger / PES tune. I've put 25,000km's on it so far running it like a rapped ape with no issues...

waydui · 07-20-2009, 07:32 AM

+1 for the NGK Iridium IX BKR7EIX-11.

I have the BWR SC with PES tune and these plugs have been great. No stumbling, smooth idle.

Regards,
Wayne

exlondoner · 07-20-2009, 07:21 PM

+1 on the NGK Iridiums, cost more than regular plugs but absolutely worth it. Just out of curiosity is it even possible to regap iridiums without causing damage.

I just plugged them in and the car ran/started fine albeit a slightly higher idle.

Westrock · 07-21-2009, 06:32 AM

Quote:

Originally Posted by exlondoner

Just out of curiosity is it even possible to regap iridiums without causing damage.

Ya you just have to do it by pushing the ground strap against something very carefully and close the gap. Dont go too small cause you dont want to open it up by prying against the electrode.

I usually push the spark plug against the concrete floor of my garage, since its hard but wont mar the surface cause its smooth.

turbophil · 07-21-2009, 08:30 AM

You should generally only change the plugs to a different heat range if the current heat range is posing a problem, i.e. appears to be too hot or too cold

. Standard gap for all the current blower systems available is sufficient. With Gap, bigger is better up until the point the spark cannot make the jump. Standard gap (the gap the plugs come with) isn't a problem-- even at 285whp and 8500rpms...

Iridiums are nice for longevity but make no appreciable excess power than their cheap copper core cousins. If you're simply trying to determine the correct heat range for the car, buy the cheap copper versions (of the same brand) for testing/tuning purposes. Once the correct heat range is determined, go buy your expensive iridium plugs that will last 50-100K miles...

FWIW- I still have copper plugs in my car and she runs okee-dokee

Best,

Phil

07-19-2009, 07:27 PM	#1 (permalink)
s4norice Registered User Join Date: Aug 2004 Location: San Diego, CA Posts: 82	What spark plug for BWR supercharger? I am installing a BWR Supercharger. I want to change the spark plug at the same time. So what spark plug should I use? __________________ 05 Lotus Elise 06 Infiniti FX35

07-20-2009, 03:29 AM	#2 (permalink)
Westrock Haxord but mine Join Date: Sep 2005 Location: Fort Worth Posts: 1,338	When I installed the VF kit I went with one range cooler iridium plugs. Part number was NGK Iridium IX BKR7EIX-11. While it seemed safer, the engine was sluggish at idle. So using a trick I learned from previous forced induction cars I went back with the stock plugs, but I gapped them down 0.035" (from stock gap of like 0.050"). The engine idle'ed good again and I didnt worry about spark blowout, which becomes a bigger problem as boost and RPM increase. __________________ -David 2006 Storm Ti Exige + VF Stage 2 Vision Function Supercharger Install Thread Stereo Harness Info \| Exige with no wing??

07-20-2009, 06:57 AM	#3 (permalink)
Dragon Hydrocarbons Rule Join Date: Sep 2007 Location: Okinawa Japan Posts: 1,747 Images: 2	NGK BKR7EIX-11's in my car with a BWR supercharger / PES tune. I've put 25,000km's on it so far running it like a rapped ape with no issues... __________________ 2006 Exige; BWR Supercharger, Adj Sway Bar, Ohlins Suspension, BSK Oil Catch Can, Moroso Oil Pan, ORC Clutch, Custom Exhaust, Black Volk Racing CE28N's w/ Toyo R1R's, 2 piece rotors, Pagid Blue Pads, BSK Wet Carbon (Side Skirts, Front Lip Spoiler, Gas Cap Cover, Center Console, Door Panels), Dry Carbon rear Diffuser, Harness Bar, BWR Gauge Mount, OMP Superquadro steering wheel, LETSLA Short Shifter, V2arms, Rear Tow Link Brace, RLS Battery Bracket, BOE Tow Bar, Stickers. Last edited by Dragon : 07-20-2009 at 08:29 AM.

07-20-2009, 07:32 AM	#4 (permalink)
waydui GR8 SCAPE Join Date: Jun 2005 Location: Kirtland, Ohio Posts: 1,182	+1 for the NGK Iridium IX BKR7EIX-11. I have the BWR SC with PES tune and these plugs have been great. No stumbling, smooth idle. Regards, Wayne __________________ _______________________ '05 Elise Magnetic Blue, Black, Touring, Hard Top, Star Shield, Stage II Exhaust, Arqray decat pipe, S2 Front Splitter (UK), Sector 111 Rear Tow Hook, Driving Lights, De-Snorkled, K&N Air Filter, Shift-I System, LSS Dampers & Springs, Sector 111 V-Bar, Schroth Profi II 5 point harness, Exige S Probax seats, 1/4 turn undertray screws, Stealth bulbs, BWR SC with PES tune, Innovative engine mounts, SS brake lines.

07-20-2009, 07:21 PM	#5 (permalink)
exlondoner Registered User Join Date: Aug 2007 Location: MD Posts: 175	+1 on the NGK Iridiums, cost more than regular plugs but absolutely worth it. Just out of curiosity is it even possible to regap iridiums without causing damage. I just plugged them in and the car ran/started fine albeit a slightly higher idle. __________________ Ohlins double adjustable c/o \| BWR front sway bar \| Milled front steering arms \| RTV brace \| Hawk pads \| R888's \| 2qt Accusump \| ACT clutch \| Baffled oil pan \| JS Stage 2 exhaust \| Schroth Harnesses \| Sector Harness bar \| Odyssey PC680 w/custom cutoff switch \| Sector trunk bag \| Sector Fire extinguisher \| SS brakelines \| B/W front emblem and wheel center caps \| Xenons \| Tints \| Tinted side LEDS \| BWR Supercharger

07-21-2009, 08:30 AM	#7 (permalink)
turbophil Plug Whisperer Join Date: Dec 2005 Location: Kansas City/ Overland Park Posts: 2,544 Images: 6	You should generally only change the plugs to a different heat range if the current heat range is posing a problem, i.e. appears to be too hot or too cold. Standard gap for all the current blower systems available is sufficient. With Gap, bigger is better up until the point the spark cannot make the jump. Standard gap (the gap the plugs come with) isn't a problem-- even at 285whp and 8500rpms... Iridiums are nice for longevity but make no appreciable excess power than their cheap copper core cousins. If you're simply trying to determine the correct heat range for the car, buy the cheap copper versions (of the same brand) for testing/tuning purposes. Once the correct heat range is determined, go buy your expensive iridium plugs that will last 50-100K miles... FWIW- I still have copper plugs in my car and she runs okee-dokee Best, Phil __________________ \| '05 GG LSS Elise \| A Track Chariot \| BOE ClamHinge \| BOE TVS SuperCharger 280whp/180wtq \| EFI Standalone Engine Management \| BOE Fuel Surge System \| BOE Lotus Tow Package See my car at BOE Fabrication: www.boefabrication.com *----->Last Updated: 9/25/2009* If something ain't worth doing right, it ain't worth doing... *Whoever thought working on a Lotus is hard, clearly hasn't tried it. Pick up a wrench and get some grease under your nails*

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