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Engine Start High RPM o.o?

When I start my engine in my 7AT usually after it has been off for a couple hours the RPM is idling at around 1.5k-2k and when I put it

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Old 07-11-2011, 06:54 AM   #1 (permalink)
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Default Engine Start High RPM o.o?

When I start my engine in my 7AT usually after it has been off for a couple hours the RPM is idling at around 1.5k-2k and when I put it in Rear or D it goes back down to around 0.5-1k. Is there something wrong with it or is it just me? I realized the increased sound after getting my F.I HFC and CBE installed. It might have been the same before but since the sound increased I paid more attention to the Tachometer. O.o I can get some pics the next time I'm in the car if that's more help. I'm just worried that the possible increase in RPM will damage my transmission.
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Old 07-11-2011, 07:09 AM   #2 (permalink)
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It is perfectly normal for the car to fast idle at 1500 rpm on a cold start, after 1 or 2 minutes this will quickly start dropping towards 1000 rpm and when the car is fully warmed up it idles at around 700 rpm unless you have the A/C on. You're probably just noticing it more now because of the HFC/exhaust swap.
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Old 07-11-2011, 07:15 AM   #3 (permalink)
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I drive 6MT and it happens on cold mornings usually for me. It has been going on for a while and I haven't seen difference in performance or anything, except being louder in the mornings. I have Ark exhaust and Stillen intakes. I'm about to get the Berk HFCs and I'll see if it makes any more difference.
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Old 07-11-2011, 07:46 AM   #4 (permalink)
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yup, very normal. Happens on my G37 5AT as well. As soon as I pop it into gear it goes back down, or if you wait a minute or so.
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Old 07-11-2011, 04:13 PM   #5 (permalink)
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ohh ok thanks for clarifying.
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Old 07-11-2011, 05:57 PM   #6 (permalink)
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Quote:
Originally Posted by Corona370z View Post
I drive 6MT and it happens on cold mornings usually for me. It has been going on for a while and I haven't seen difference in performance or anything, except being louder in the mornings. I have Ark exhaust and Stillen intakes. I'm about to get the Berk HFCs and I'll see if it makes any more difference.
I wonder how many of my neighbors I wake up when I start the beast.

I've noticed that for the first few minutes the car is crazy responsive too. I understand it's the cold in the engine that's doing this.

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Old 07-11-2011, 06:30 PM   #7 (permalink)
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yah, i too kinda wonder how loud it is for my neighbors when i start mine with the fujimura muffler each weekend morning. it's nowhere near as loud as my old wrx with blitz catback (no silencer used).
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