1987 Dodge Daytona Shelby Z
2.5l .020 Wiseco pistons
T2 rods, Balanced, crank scraper, rebuilt around 500 miles ago
Stock swirl head, ported 2 piece intake, ported exhaust manifold, 52mm TB, 1989 roller cam, adj. cam sprocket @ 0, billet TU fuel rail, adj. FPR, 255lph Holley fuel pump, stock fuel lines, 52pph injectors, 3 bar MAP, Magnecor wires, Champion 12YC plugs @ .035, Accel coil, stock T2 turbo 10psi, custom boost button cal, 3" turbo back mandrel bent exhaust
I think that's about it. Driving normally around town or on the highway, the car runs like a dream. The problem comes in when I mash the accelerator. at roughly 3500rpm, like clockwork, the car has a terrible misfire and a puff of smoke comes from the exhaust, and the knock sensor flashes the power loss light. I take my foot off the gas and everything comes back to normal. Below 3500, I have 0 issues, and part throttle boost is perfectly fine too. I get full boost of 10psi at the moment at roughly 2700rpm, even under part throttle. If I go part throttle to 3500, even under boost, I have no problem. The problem is only at WOT. Ive changed the fuel filter, even though the AF gauge shows rich at WOT. I took out the RN9YC plugs with no change. Plugs looked great when I pulled them, not overly rich or lean, just right. Swapped the HEP with no effect. I haven't changed the coil yet, or the wires. These were on the car when I bought it, on the old T2 2.2l. Does this sound like an ignition problem, or maybe a fuel problem, or maybe even a cam timing problem? I'm at a loss, and don't want to just swapping parts that MAY be bad. I wonder if at WOT when all that fuel is being dumped in, I don't have enough spark to keep up with it. This leads me back to the coil. Any and all suggestions are welcome! Thank you!