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Old 08-11-2013, 11:13 AM   #1
madspeed's Avatar
Join Date: Jan 2013
Location: Montoursville PA
Posts: 220
turbo gurus, black plugs? tuning question within

Hey guys, finally got my car done and ready to go. Or so I thought. Took it out for a spin yesterday and all seemed well, a little rich on the idle afr's at 13.5, and part throttle cruise at low 14.xx's. WOT afr's were right at 11.5. I noticed at the upper rpm's it started it sound like it was breaking up. Got back home and pulled some plugs and they were all black with soot and smelled of fuel. Could the bit of richness be causing this? Tune is done with a Quarterhorse by Willie at Dirty Dirty Racing. I've been dealing with him for a few months while getting everything straightned out and he's done a good job so far. I just upgraded to an hpx slot maf and this is the first tune with that maf. Think its just the maf curve needing adjusted a bit yet?

Combo is 333 ci, h/c/i,on3 kit with 70mm turbo, 60# injectors, hpx slot maf, ngk5671-8 plugs gapped at .028, msd box etc. motor only has about 1500 mils or so on a build by a reputable shop
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