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Attn: Colorado and high altitude people

330 Views 1 Reply 2 Participants Last post by  Orlando_87GN
When I look at the spring cleaning guide and recipes on gnttype.org, it says "For cars running 12's and down run AC R42 plugs..."
Since we are over a mile above sea level and thus the typical 12 sec run is a high 12 to low 13 up here, would I still use the R42 or the R43? I don't know if the plug recomendation is based on ET or boost that you are running. Any help? Know what I mean? Thanks,


87 GN, hotwired Walbro 340, RA volt booster, blue IC hoses, home made CAI, RA 93 chip/ KB Hotflash, AFPR, gutted cat, pinon snubber, engine tie down and free mods.
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Try the 42's and you will switch back to the 43's..

Don't know who came up with that hard fast rule, but it doesn't apply to any of my cars.


Stock Block, Stock Cam, PTE-52, Champion Heads, V4, MSD50's, TH DP, JayJackson 62mm TB, 16position MaxEffort Chip. 3680# with Driver
12.0 @ 116.5mph w/20psi using 17.9* timing

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