While my 540 is a joy to drive with power available on demand in every gear, the 525 is really pathetic. I havn't been driving it for a long, long time so I lost the feel for its power and torque, or lack there of. It has been my son's daily ride while i was using the 9000 turbo. The 525 has had an engine consuming some oil I replaced it with a 93 M50tu only two weeks ago. While the 93 engine has 170k miles, it is a much stronger engine, IMO. The compression numbers were impeccable. There are 235, 230, 180, 235, 235 and 235. And these were done following engine install when the engine doesn't start because I blew a 80 amp fuse link. The 93 engine has been stting in the corner of my garage for two years. I'd say the numbers are very, very good despite the low number in the middle.

Anyway the 525 has no power in low gears after I replaced the engine. I need to rev the engine close to 3,000 rpm in first to pull away many times. If I start in second the car just sit motionless not responding to the gas pedal. At higher speeds the 525 is okay. People have been suggesting to me to get a chip. But I seriously think something was wrong although no codes were thrown. I know I shouldn't compare to when it is new. But if it were like this 12 years ago no one would have bought it.

What could have gone wrong?