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drshotty
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Bought a 2.6in pulley and a metco idler pulley for the slack. and a cai. and was reading somewhere that in order to run a bigger pulley i would need to buy heftier spark plugs otherwise the ones i currently have would blow up. Is that actually true? Also does anyone have a specific place they enjoy getting a tune from that has always worked well for them? I will be continuously doing upgrades so I'm just going to use this topic over and over.

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Do you mean to say your install a smaller pulley ? What are you installing it on ? As far as the spark plug you will go to a cooler plug if installing a pulley , & tune. As for a tune there several out there Ford Racing, Steeda IE

 

Is this going on a Shelby G.T 500 , G.T , or a G.T350?.

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I have a 2.5" pulley on my 2010 with stock plugs and 0 issues. I spoke with VMP and Lethal Performance prior to installing my pulley and both vendors said stock plugs are fine but for track use they would recommend colder plugs.

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im in texas where it gets to 100 degrees no problem with a humidity of 100%.. don't know if that would make a difference, ill probably install the plugs anyway. Also for sure going to change the shifter. Do y'all have a preference? Ive heard MGW is the best without a doubt. Not nearly as notchy, haven't really heard of any others.

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The cooler plugs are included with Stage 2 kits (2.6 pulley, CAI and performance tune) from Evolution Performance and others, probably to keep detonation in check when in the increased boost. The NGK's are around $2.50 a piece so I view it as cheap insurance, not them trying to get more money.

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It won't hurt to install new plugs that's for sure. I went with the NGK Iridiums that are one step colder than stock after I installed my TVS. Be sure to gap them correctly. Higher boost requires less gap or you'll blow the spark out before it can ignite the fuel in the combustion chamber.

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If I was in a place like Texas where the temps outside can get quite high. The first mod I would do would be a higher capacity, dual fan heat exchanger. A smaller pulley will make the supercharger spin faster and run hotter and increase the chance that your car will pull timing and nullify any gains the smaller pulley will give you. Heatsoak is a big problem with these cars when you start getting into warmer summer temperatures.

Edited by Cdvision
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