328i Lazy Throttle Response - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 09-22-2005, 05:02 PM
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328i Lazy Throttle Response

When accelerating up through the gears and backing off the throttle for a gear change, the engine RPM's don't drop crisply - seems like the engine speed stay's high for a few seconds causing the car to lurch ahead on the next shift. I'm accustomed to a more crisp response from an engine when the throttle plates close. Is this normal behaviour for a stock 2.8 motor? Since this is my first BMW I have no other experience to compare with.
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#2 (permalink) Old 09-22-2005, 08:55 PM
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gotta throw this out because this is what happened to me.........but check your car mats and make sure they arent on the gas.

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#3 (permalink) Old 09-23-2005, 08:46 PM
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TB wires maybe gettin stuck?

-Serge
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#4 (permalink) Old 09-26-2005, 10:00 AM
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I think this depends on the your driving style. I have trouble with this sometimes because the float at the top of the clutch pedal messes with my timing. It also makes a diffrence if you are lazy with the throttle. If you snap your foot of rather than lifting it, most EFI engines seem to react accordingly.

What kinds of other cars do you drive?

Greg

97 328iS, Manual, Stock
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#5 (permalink) Old 09-26-2005, 11:39 AM
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When RMS fall quickly, there are more hydrocarbons generated. The software makes them fall more slowly via the idle valve opening. Saving the environment i guess...
First dont forget to try and adjust your pedal timing - release the throttle a little sooner. Give the engine a chance to slow it's positive rotational acceleration before it has to head in the negative direction again.
Still not happy? You could try decreasing the rotating mass of the engine (flywheel, fan delete, internals if you are serious), or find a workaround for the software (makbe sharking??). Also, if the AC is on, the extra load makes RPMs fall faster, but of course subrtacts from usable hp.

Edit: Lube the throttle mechanisim and clean the butterfly valve. Check for intake manifold leaks.

'99 323i 5spd


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Last edited by SpooldUp; 09-26-2005 at 11:41 AM.
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