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« on: July 26, 2007, 12:24:49 PM »
Jen has the same issue with hers. I think it has a lot to do with the engine mounts. When you are creeping along in first gear, you are only getting 12.5 fire pulses per second (1,500 rpm / 60 seconds (per minute) / 2 fire pulses per crank rotation). The engine is going to rock each time a cylinder fires, and if you have older engine mounts, the engine will sway. Having a 200 lb weight swaying in a light car is going to rock it pretty good, which exaserbates the problem. The more the car sways, the more the engine sways. The more the engine sways.... You get the point. Adding polyurethane inserts in the motor mounts should help.
I'm not saying it's only the motor mounts, it could be something else. Also, since the Z doesn't have a whole lot of torque, it won't keep the car moving as well as a bigger engine, which is probably why it rocks so much. I know that once Jen put the high rev intake cam in, it made the problem worse.