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Jay Mauney
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what plug to use on modified 930?
What plug is the right temp range (or offers the most effiecient use of the added fuel odf the euro cis) for these mods on a 1986 930 turbo
Euro CIS 1.2 bar boost euro injectors 100 oct av gas (always) headers |
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Registered User
Join Date: Mar 2002
Posts: 3,563
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You could stick to the OEM W3DPO, but they are a pretty cold plug, so you could even move up to a W4CS plug.
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition ![]() |
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Turbo Hooligan
Join Date: Sep 2007
Location: Greensboro NC
Posts: 1,246
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I run denso iridiums, I'll have to look up the model number for you, but I have to run a cold plug to help prevent detonation. I'm one of the few around here that run 1.2 bar.
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Registered
Join Date: Jun 2001
Location: Sweden
Posts: 5,771
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I recomend NGK B8EVX
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Thank you for your time, Last edited by beepbeep; 03-20-2008 at 11:05 AM.. |
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Slantnose from HELL
Join Date: Dec 2004
Posts: 860
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Goran, here in the states the EVX (platinum) are discontinued. The replacement is EIX (iridium)for the suffix. I know there is still stock of the platinums scattered, I too used them but in the heat range of 9. The Platinums were also cheaper than the iridiums. If you can still get them they are great plugs. I run BKR9EIX, what I like about this plug, is that it has a 5/8 hex instead of 13/16. This makes it easier to get the socket in the tight confines of the 911. specially if you are running twin plug. Word to the wise you must NOT use those generic sparkplug gap tools on iridium plugs. The ground strap must be bent by itself and not using the electrode as a fulcrum. Rule of thumb is for every 100HP over stock, you run "1" heat range colder.
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It changes from time to time..... |
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Max Sluiter
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Novice question
What does the heat range of a spark plug refer to? How does it relate to detonation?
Thanks for the schooling ![]()
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911S 1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance http://www.flickr.com/photos/max_911_fahrer/ |
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Registered
Join Date: Jun 2001
Location: Sweden
Posts: 5,771
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Quote:
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Slantnose from HELL
Join Date: Dec 2004
Posts: 860
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It is really cold where you are......... Well atleast to me it is. In Florida (hell) it is hot and well just flat out hot,,,,,,and humid. I have never fouled a 9 but I suspect the colder weather definetly playing a big part in it. Do you guys put your cars away in the winter? And how long are your winters?
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Slantnose from HELL
Join Date: Dec 2004
Posts: 860
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A givin plug designed for a specific motor will run a steady temp and as long as the mixture is correct, it should last quite a long time. If you have more power being generated the the plug can become too hot and promote detonation. (meaning the plug will be so hot the temp of the plug will ignite the fuel in the cylinder before the coil sends the spark). To control temp or to change the range of the plug the amount of ceramic exposed in the end of the plug determines how hot it will be. If the ceramic is recessed alot in the end of the plug the colder it is, the more exposed the hotter it is. The more power you make the more heat you can generate. so finding the right plug to live in extreme motors is a neccessity. As Goran states you can go to cold and foul the plug. Climate, elevation, and all elements of nature definetly play a part. But if you have normal mods to your 930, only 1 or 2 heat ranges colder would be sufficient.
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Registered User
Join Date: Oct 2005
Location: Kihei, HI - Maui
Posts: 593
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The temperature of the spark plug relates to how much heat it conducts out of the combustion chamber. See this page for a great explanation: http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp
Different plug manufacturers use different heat range numbers or letters in their designations. Even more confusing, some get colder as they increase and some get hotter as they increase. The hotter they are, the less likely they are to soot up and the more likely they are to cause engine detonation. Your goal is to find a heat range that doesn't soot up in normal driving and doesn't detonate when you are driving at full performance levels. On my engine (roughly 425 flywheel hp) I use the NGK BKR7EIX plugs which are a couple of steps cooler than the NGK BKR9EIX plugs (CORRECTION, 7s ARE A COUPLE OF STEPS HOTTER THAN 9s IN THE NGKs). I'm dual plugged and it seems to be a reasonable range for my street use with occasional spirited driving. My choice was based on the OEM range of the twin turbos minus one heat range. It wasn't based on extensive trial and error.
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Registered
Join Date: May 2002
Location: Up North
Posts: 1,447
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I got confused about NGK & Bosch numbering a lot, but I thought for NGK, 7 is hotter than 9?
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87 930 K27HFS/B&B/Twin-Plug... Megasquirted ![]() |
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Max Sluiter
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Thanks for the info, mppickett and GJF.
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911S 1971 chassis, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance http://www.flickr.com/photos/max_911_fahrer/ |
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Registered
Join Date: Jun 2001
Location: Sweden
Posts: 5,771
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Quote:
Porsche started with recomending NGK 8's in turbocharged cars to be on the safe side, which went down to 7's as they noticed that owners weren't driving them hard enough to "unfoul" the plugs.
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Registered User
Join Date: Oct 2005
Location: Kihei, HI - Maui
Posts: 593
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You are right. Sorry about the confusion.
Mike
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07 Audi A4 2.0T Cabriolet - Black/Black (sold) 96 993 C2 Cabriolet - Arena Red/Tan (sold) 82 911SC - 993 Turbo Cab Trib - Speed Yellow/Black (sold) 58 DKW Universal - Baby Crap Yellow/Beige (sold) |
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Wo ist die Rennstrecke?
Join Date: Mar 2004
Location: St Johns, FL
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