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View Full Version : Could anyone do a test on his bmw with m20 engine and A/C?


gvilkelis
10-09-2005, 01:08 PM
Hello,

On my 525 1988 m20 engine, if I hold accelerator pedal to keep steady 2000rpm and press A/C button, rpm gradually rises to about 4000rpm. And stays there until A/C cluctch disengages, or I remove foot from accelerator pedal.

Could anyone do the same test on his car and post the results? I am wonderring if there is something wrong with my car, or is it normal?

thanx!
uscharalph
10-09-2005, 05:28 PM
Hello,

On my 525 1988 m20 engine, if I hold accelerator pedal to keep steady 2000rpm and press A/C button, rpm gradually rises to about 4000rpm. And stays there until A/C cluctch disengages, or I remove foot from accelerator pedal.

Could anyone do the same test on his car and post the results? I am wonderring if there is something wrong with my car, or is it normal?

thanx!
I hope you're not doing this in park. I'll try it tonight on the road.
Torque
10-09-2005, 05:40 PM
If your car is automatic, don't rev it in park or netural. You can destroy your tranny. Like Ralph said, I'll try it on the road for you tonight and see how much of a rpm rise I get.
JAlfredPrufrock
10-09-2005, 05:48 PM
If your car is automatic, don't rev it in park or netural. You can destroy your tranny. Like Ralph said, I'll try it on the road for you tonight and see how much of a rpm rise I get.

THERE"S TOO MUCH TORQUE oh noes!!!!!!!!!!!!!!111111111111111111
Dan in NZ
10-09-2005, 06:25 PM
It's not a matter off too much torque, it's the well documented ZF4HP22 design fault... Has seen many transmissions destroyed during emissions testing in the states.
Torque
10-09-2005, 07:10 PM
I just got back home. Driving steady at 2k rpm, AC on ... can't even tell that there is a rpm jump. Maybe a couple of hundred rpm at most. I know at idle, it's a couple hundred as well.

edit: maybe not even that much.
uscharalph
10-09-2005, 07:47 PM
THERE"S TOO MUCH TORQUE oh noes!!!!!!!!!!!!!!111111111111111111
?????
Torque
10-09-2005, 08:17 PM
?????Maybe he was saying that because of my username ? Who knows.
gvilkelis
10-10-2005, 03:17 AM
I hope you're not doing this in park. I'll try it tonight on the road.

Forgot to write in my first post - the my car has a manual transmission.