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Hotter or Colder Spark Plug

Now that I am turbocharging my 3L and am going to replace the plugs. Do I want a hotter or colder plug.
The plan was NGK BPES (copper) but I was not sure what heat range I should buy them in.

Thanks JC
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Jeremy C.
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-2008 550i M-Sport
Old 11-10-2007, 06:16 AM
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I had the denso IK22s in my car but then switched to NGKs. Im not sure what range but take the manufacturers recommended range and go down 1 or two ranges and start from there.
depending on boost I would gap them between 22 and 25 as to not blow the spark out.
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Old 11-10-2007, 06:50 AM
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So even though factory reccomends a gap of 70-80. You think I should go down to 22-25?
Thanks for the info. I think I will buy in the 7 range for temperature.
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 11-10-2007, 07:21 AM
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Are we talking standard or metric? You want a small gap when high cylinder pressures are introduced so you dont heat everything up and/or blow the spark out.
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Kris @ Tech9
86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 11-10-2007, 03:51 PM
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The 930 should have used a colder plug than the 911.

The correct factory specified plug is the Bosch W3DPO although people say they are too cold really for the street.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 11-10-2007, 03:52 PM
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Factory gap is 0.024"
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
Fitting - New service kit.
Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head.

1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

http://www.danasoft.com/sig/Iamnotanumber.jpg
Old 11-10-2007, 03:59 PM
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You are right, I was talking in millimeters. Back cover of Bently says 0.028-0.032"
I went with the NGK BPR7ES
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Jeremy C.
Why's he calling me meat? I'm the one driving a Porsche. (Bull Durham)
----Nothing is far away in this car!----
-1978 911 SC TURBO, Minerva Blue Targa 965 update.
-2008 550i M-Sport
Old 11-11-2007, 04:17 AM
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I use one step colder on a bosch plug, that's wr6dc, stock is wr7dc.
lower number is colder for bosch
lower number is hotter for NGK

I started with sevens, went to sixes, and ordered fives. But the sixes look good, just looked at them this morning, 300 miles on them.
Old 11-11-2007, 08:55 AM
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