Can a convertor cause a huge loss of horsepower at the rear wheels but seemingly be working ok? In a nutshell, I have a 12.5:1 468 that I figure should be making around 550-575 hp, this engine ran very strong. One day I take it out just playing around and the car just feels weak, no missing or bogging just a loss of power.
The next day I had it on a chasis dyno and it made 307 hp and 340 ft torque which is about what the car feels like now. The operator said he had seen bad convertors rob as much as 150 hp on his dyno. Nevertheless I've checked everything I possibly can, compression, valve lash, timing, fuel pressure, I"ve replaced plugs, plug wires, coil, ignition box and have found nothing wrong with the engine nor the tune of the engine but it is still down on hp.
At this point I'm "almost" convinced it's not a engine problem and starting to entertain the ideal it could be in the convertor or trans. The stall speed on the convertor hasn't changed and I've pulled the pan off the trans and it was clean. One thing I did notice is with the trans in neutral and back tires off the ground, when I spin the driveshaft I can hear a clicking sound in the transmission.
Can the convertor still be acting normal but not putting the power to the ground? Ken
The next day I had it on a chasis dyno and it made 307 hp and 340 ft torque which is about what the car feels like now. The operator said he had seen bad convertors rob as much as 150 hp on his dyno. Nevertheless I've checked everything I possibly can, compression, valve lash, timing, fuel pressure, I"ve replaced plugs, plug wires, coil, ignition box and have found nothing wrong with the engine nor the tune of the engine but it is still down on hp.
At this point I'm "almost" convinced it's not a engine problem and starting to entertain the ideal it could be in the convertor or trans. The stall speed on the convertor hasn't changed and I've pulled the pan off the trans and it was clean. One thing I did notice is with the trans in neutral and back tires off the ground, when I spin the driveshaft I can hear a clicking sound in the transmission.
Can the convertor still be acting normal but not putting the power to the ground? Ken
