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Join Date: Dec 2001
Posts: 4,150
Xdi spark plug gap?

Recommended spark plug for a single plug Electromotive xdi set up. Using Bosch w3cs plugs?
thanks.

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'79 930/DP935
'68 VW 3.3 Turbo Crewcab
Old 04-27-2018, 10:06 AM
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Join Date: Aug 2007
Location: Austin
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Stock Street Engine 0.045”-0.060” (1.1mm-1.5mm)
 High Performance Street 0.030”-0.035” (.75mm-.9mm)
 Alcohol High Compression 0.025” (0.65mm)
 High Power 75 -115 HP per Cylinder 0.025” (0.65mm)
 Over 115 HP per Cylinder 0.022” (0.55mm)
 Over 12:1 CR or Over 14psi Boost 0.022” (0.55mm)

http://electromotive.com/wp-content/uploads/2015/05/XDI-v1.7.pdf
Old 04-27-2018, 10:34 AM
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GJF GJF is offline
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Join Date: Dec 2004
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Been running the F4CS plugs at .024. same thing as the W4CS but with the difference of having a 5/8 hex instead of a 13/16 hex. Makes it easier when changing them. More room. On your next set buy F3CS. You should be able to get away with .028 at your power level.

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Old 04-27-2018, 12:19 PM
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