help look at my dyno sheet.
help look at my dyno sheet. My car car is running realy rich, burning everyones eyes,smells like gas. It puffs a little smoke at 3900 and then run ok until it fall on its face at 5200 and blows a lot of black smoke,like a diesel. the red is what the dyno operator said the dyno knows when the car is missing or vibrating. The power is less then i expected too. only 294 with mods in sig. this is w/o the hypertech. it did the same thing with the hypertech installed but it was a little worse with about 10 less hp. Didnt have wideband or fuel pressure gauge and i know that would have helped a lot. The car runs fine other than its too rich and it stutters up high right before it shifts(like on the graph). I was gonna do a pull to 5800 but i let off after it falls out so it only goes to 5700. Sorry the graph is hard to see. Could a bad sensor cause this? thanks for any help.
Stock rockers crapped out a long time ago. Hasn't happened long, i didn't change anything that i can think of. i've checked plugs and they are dark but don't look that bad.
I'm willing to bet it's the rockers. Valvetrain harmonics/geometry can cause upper rpm problems if not installed correctly. Shimming and/or changing the pushrod length may be necessary when changing rockers from the stock, non-adjustable setup. It all depends on what your preload and wipe pattern looks like. If you didn't check any of this when you installed those rockers, I'd highly recommend looking into doing so.
you need to see the AFR as well. You may just be way to rich at WOT. My stock tune commanded like 11..x AFR. Since you have a ORY you want to disable the COT for the cats too, that being enabled can cause richness.
I would surely check out the situation with the rockers first though.
I would surely check out the situation with the rockers first though.
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The fill in of the graph is normally in indication of the mustang dyno not reaching the target rpm cutoff, and ending the test. Until you press the stop test button on the screen, you will get this. I get this sometimes when you hit the limiter a few rpm early and can't get the run continued.
Ryan
Ryan
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Verdad Gallardo Do you guys think it could be a vaccum leak making it run lean at high rpms then the computer adds too much fuel to compensate for the extra oxygen not detected by the maf?
