Engine Start High RPM o.o?

Cafiax · 07-11-2011, 06:54 AM

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.

ChrisSlicks · 07-11-2011, 07:09 AM

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.

Corona370z · 07-11-2011, 07:15 AM

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.

Brutal 370Z · 07-11-2011, 07:46 AM

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.

Cafiax · 07-11-2011, 04:13 PM

ohh ok

thanks for clarifying.

KusoSama · 07-11-2011, 05:57 PM

Quote:

Originally Posted by Corona370z

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.

kenchan · 07-11-2011, 06:30 PM

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).

07-11-2011, 06:54 AM	#1 (permalink)
Cafiax Enthusiast Member Join Date: Nov 2010 Location: Canada - Richmond Posts: 291 Drives: 10 Nissan 370z PW A7 Rep Power: 16	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.

07-11-2011, 07:09 AM	#2 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 655	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. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

07-11-2011, 07:15 AM	#3 (permalink)
Corona370z Enthusiast Member Join Date: Aug 2010 Location: Ewa Beach, HI Age: 38 Posts: 416 Drives: Naked on sunny days Rep Power: 16	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. __________________ Stillen Intake, ARK Exhaust. Hopefully in the near future: Tanabe GF210 Lowering Springs, Hotchkis Sway Bars, Motordyne M370 Intake Manifold.

07-11-2011, 07:46 AM	#4 (permalink)
Brutal 370Z Enthusiast Member Join Date: Jun 2011 Location: Greater Toronto Area Posts: 357 Drives: 11' MB/Pers/6M/S/Nav Rep Power: 15	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. __________________ Stillen G3/CBE/HFC, Nismo S-tune Front Chin Spoiler, 20% tint, Password JDM V2 Shift Knob

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07-11-2011, 04:13 PM	#5 (permalink)
Cafiax Enthusiast Member Join Date: Nov 2010 Location: Canada - Richmond Posts: 291 Drives: 10 Nissan 370z PW A7 Rep Power: 16	ohh ok thanks for clarifying.

07-11-2011, 06:30 PM	#7 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141522	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).