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Cold start - abrupt power delivery

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Old 11-26-2007 | 06:24 PM
  #1  
ashwins's Avatar
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From: Raleigh
Cold start - abrupt power delivery

Something I noticed recently. When I start my car in the morning, If I take it to 6000 RPM or above in first gear, there is a sudden drop of power for a second, and the next second, there is a sudden supply of more power than normal.

It is as though there is no power for a second and the next second, its giving more power than normal trying to make up for the power it didnt deliver.

However this problem doesnt appear after driving a couple of minutes or If I shift to higher gear before 6000 RPM.

Anyone knows/experienced this?
Old 11-26-2007 | 06:39 PM
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From: I AM THE INFANTRY FOLLOW ME!
yea when i wake up to go to school in the morning and it being winter. Its cold as hell. I start my car. Its up at 3k then 2k and its sits their then about..5 minutes shes warm then its all good to go. But i think the 8 has a restrciter to were if the engine is cold. You cant go over a certain rpm,I remember me talking to my friend and he said yea. Some like a M3 has it were u cant go past 3k rpm when the car isnt warm, So as far as i no, its all good and normall just dont rev her. Wait till shes warm, wake up earlier so u can give ur car time to warm up.
Old 11-27-2007 | 08:59 AM
  #3  
Currin's Avatar
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From: Pensacola(Gulf Breeze), FL
Originally Posted by WAR CRUNK
yea when i wake up to go to school in the morning and it being winter. Its cold as hell. I start my car. Its up at 3k then 2k and its sits their then about..5 minutes shes warm then its all good to go. But i think the 8 has a restrciter to were if the engine is cold. You cant go over a certain rpm,I remember me talking to my friend and he said yea. Some like a M3 has it were u cant go past 3k rpm when the car isnt warm, So as far as i no, its all good and normall just dont rev her. Wait till shes warm, wake up earlier so u can give ur car time to warm up.
yeah. I never put it in gear untill its warmed up. It takes awhile but it increases your engines life(specialy for the rotary engine).
Old 11-27-2007 | 09:08 AM
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^overkill................. Just take it easy, till warm.
Old 11-27-2007 | 09:12 AM
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Originally Posted by ashwins
Something I noticed recently. When I start my car in the morning, If I take it to 6000 RPM or above in first gear, there is a sudden drop of power for a second, and the next second, there is a sudden supply of more power than normal.

It is as though there is no power for a second and the next second, its giving more power than normal trying to make up for the power it didnt deliver.

However this problem doesnt appear after driving a couple of minutes or If I shift to higher gear before 6000 RPM.

Anyone knows/experienced this?
That's the engine protecting itself from you.
Old 11-27-2007 | 10:02 AM
  #6  
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From: Knoxville, TN
Originally Posted by 4me2
^overkill................. Just take it easy, till warm.
Yeah, you can drive it cold in whatever gear you want, just keep the RPMs low like any other engine. I never drove my piston engine above 3000 when it was cold. Also note that you can drive this engine at very low engine speeds and switch gears jsut fine... it's recommended right there in the user manual under "cruising".

It also specifically recommends not to wait and sit with the car heating up: "avoid long warm ups, begin driving as soon as the engine idle is smooth." Smooth means not oscillating or constantly changing RPMs, which the engine will do when very cold, as someone else mentioned, starting around 2500 RPM and slowly dropping. It also mentions in the manual that you shouldn't give it gas to warm it up if the outside temps are below freezing. Above freezing you can feel free to give it some gas to smooth out the RPMs quicker. Test it out by watching the RPMs as you give it some gas. If they start out around 2000, give it some gas (only a tiny bit, bring the RPMs like 500 higher or something), and when you let up it will drop to 1500, etc.
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