Idling Too High In Gear?
#1
New Member
Thread Starter
Idling Too High In Gear?
Greetings from planet Earth.
Okay, so last year my car would turn off on me after I put it in neutral while driving. I figured that it was because it idles too low when in neutral so I messed with the gas pedal sensor a bit... I got it to idle at a higher RPM but only when in gear. Anyway, after swapping out my CAI filter, and seafoaming the Z twice, it would only turn off on me very rarely.
This year, I replaced my throttle body and did the gas pedal relearning thing or whatever it's called. Now it idles perfectly when in neutral but I feel like I idle way too high when driving.
For example, I'll be in 4th gear, going around 33 MPH and idling at 2k RPM. Is that high or what? At 45 MPH, I'm in 5th, idling just above 2k. I like to keep it at 2k RPM when cruising so I end up being in a gear higher than what I feel like I should be in. In neutral, at normal temperature, I'm idling at around 500-650.
What do you guys think? Am I idling too high when driving or is it just me? Any ideas on what I can do to fix this? Any suggestions are appreciated and any comments making fun of me are also welcomed.
Thank you and God bless the universe.
Okay, so last year my car would turn off on me after I put it in neutral while driving. I figured that it was because it idles too low when in neutral so I messed with the gas pedal sensor a bit... I got it to idle at a higher RPM but only when in gear. Anyway, after swapping out my CAI filter, and seafoaming the Z twice, it would only turn off on me very rarely.
This year, I replaced my throttle body and did the gas pedal relearning thing or whatever it's called. Now it idles perfectly when in neutral but I feel like I idle way too high when driving.
For example, I'll be in 4th gear, going around 33 MPH and idling at 2k RPM. Is that high or what? At 45 MPH, I'm in 5th, idling just above 2k. I like to keep it at 2k RPM when cruising so I end up being in a gear higher than what I feel like I should be in. In neutral, at normal temperature, I'm idling at around 500-650.
What do you guys think? Am I idling too high when driving or is it just me? Any ideas on what I can do to fix this? Any suggestions are appreciated and any comments making fun of me are also welcomed.
Thank you and God bless the universe.
#2
Super Moderator
MY350Z.COM
MY350Z.COM
iTrader: (8)
Automatic trans ?
#4
New Member
If you are in gear at a certain speed, you are not idling. The only thing that would affect what you are describing is your gear ratio. I think it is all in your head lol.
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Arrtus (04-27-2016)
#5
6 inch cawk is my fave!
iTrader: (3)
I agree it's all in your head you are only idle when in neutral or if your holding down the clutch.
If your going down a hill in 2nd gear going 25mph you might be at 5000 rpm as the engine works to slow you down, going back up the hill at the same 25mph in 2nd gear you might be at 3000rpm...
In your example thats just the rpm the engine stays at to maintain the speed in your selected gear.
It has nothing to do with your idle, and everything to do with gearing and the transmission.
If your going down a hill in 2nd gear going 25mph you might be at 5000 rpm as the engine works to slow you down, going back up the hill at the same 25mph in 2nd gear you might be at 3000rpm...
In your example thats just the rpm the engine stays at to maintain the speed in your selected gear.
It has nothing to do with your idle, and everything to do with gearing and the transmission.
#6
General & Tech Moderator
MY350Z.COM
MY350Z.COM
I may be wrong, but if we change "idling" to "revving" it's a reasonable question.
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Arrtus (04-27-2016)
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Arrtus (04-27-2016)
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#8
6 inch cawk is my fave!
iTrader: (3)
But the explanation is the same its got to do with the gearing of the transmission and rear axle that determines the engine RPM.
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Arrtus (04-27-2016)
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Arrtus (04-27-2016)
#10
25 mph downhill (off throttle) the ecu or ecm in this car will be adding fuel and the load will be different.
Engine load plays just as big a role and engine speed.
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Arrtus (04-27-2016)
#11
Registered User
iTrader: (15)
25 mph is not going to be the same on incline and decline. One, on an incline you are adding gas via the pedal and will be at a certain load.
25 mph downhill (off throttle) the ecu or ecm in this car will be adding fuel and the load will be different.
Engine load plays just as big a role and engine speed.
25 mph downhill (off throttle) the ecu or ecm in this car will be adding fuel and the load will be different.
Engine load plays just as big a role and engine speed.
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iideadeyeii (04-27-2016)
#12
+1 dcains
When the clutch is locked, the rear wheels are locked to the gear box which is locked to the crank shaft which IS the engine RPM, i e the wheels are locked to the engine rpm (manual transmission). A certain engine speed will always produce the same travelling speed, or vice versa, (providing you're in the same gear of course) through a series of constants (gearbox ratio, diff gear ratio, wheel diameter etc) and will not change wether you're driving in an incline, flat or decline... UNLESS your clutch is slipping, which is a whole other matter.
But to the matter, just above 2k at 45mph in 5th sounds about right. Don't worry you're fine.
When the clutch is locked, the rear wheels are locked to the gear box which is locked to the crank shaft which IS the engine RPM, i e the wheels are locked to the engine rpm (manual transmission). A certain engine speed will always produce the same travelling speed, or vice versa, (providing you're in the same gear of course) through a series of constants (gearbox ratio, diff gear ratio, wheel diameter etc) and will not change wether you're driving in an incline, flat or decline... UNLESS your clutch is slipping, which is a whole other matter.
But to the matter, just above 2k at 45mph in 5th sounds about right. Don't worry you're fine.
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Arrtus (04-27-2016)
#13
New Member
Thread Starter
Okay, I meant the RPM while in gear seems high. Not idling.. my bad! I figured you guys would know what I meant.
What are you guys usually at when you're going 40 MPH? And in what gear exactly are you in?
What are you guys usually at when you're going 40 MPH? And in what gear exactly are you in?
#14
New Member
Thread Starter
+1 dcains
When the clutch is locked, the rear wheels are locked to the gear box which is locked to the crank shaft which IS the engine RPM, i e the wheels are locked to the engine rpm (manual transmission). A certain engine speed will always produce the same travelling speed, or vice versa, (providing you're in the same gear of course) through a series of constants (gearbox ratio, diff gear ratio, wheel diameter etc) and will not change wether you're driving in an incline, flat or decline... UNLESS your clutch is slipping, which is a whole other matter.
But to the matter, just above 2k at 45mph in 5th sounds about right. Don't worry you're fine.
When the clutch is locked, the rear wheels are locked to the gear box which is locked to the crank shaft which IS the engine RPM, i e the wheels are locked to the engine rpm (manual transmission). A certain engine speed will always produce the same travelling speed, or vice versa, (providing you're in the same gear of course) through a series of constants (gearbox ratio, diff gear ratio, wheel diameter etc) and will not change wether you're driving in an incline, flat or decline... UNLESS your clutch is slipping, which is a whole other matter.
But to the matter, just above 2k at 45mph in 5th sounds about right. Don't worry you're fine.
Last edited by Arrtus; 04-27-2016 at 06:08 AM.
#15
6 inch cawk is my fave!
iTrader: (3)
About 2nd or 3rd I like that motor to run... But for cruising around town probably 4th or 5th
I know what you mean that the 350z runs at a higher rpm then lots of non sports minded vehicles, on the highway at highway speeds the Z will be at 3000rpm in 6th gear going 70 (example not actual) while in a juke you might be going 70 on the highway and it will only be at 2200rpm... Its because the cars gears are set up that way.
Its most noticeable on the highway, and is something you realize especially when your Z isnt your daily driver.
My only suggestion is to up the rpm your trying to cruise around in... 3000rpm and below is your sweet spot for cruising 2000rpm is too low
I know what you mean that the 350z runs at a higher rpm then lots of non sports minded vehicles, on the highway at highway speeds the Z will be at 3000rpm in 6th gear going 70 (example not actual) while in a juke you might be going 70 on the highway and it will only be at 2200rpm... Its because the cars gears are set up that way.
Its most noticeable on the highway, and is something you realize especially when your Z isnt your daily driver.
My only suggestion is to up the rpm your trying to cruise around in... 3000rpm and below is your sweet spot for cruising 2000rpm is too low
The following users liked this post:
Arrtus (04-27-2016)
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Arrtus (04-27-2016)
#17
New Member
Thread Starter
About 2nd or 3rd I like that motor to run... But for cruising around town probably 4th or 5th
I know what you mean that the 350z runs at a higher rpm then lots of non sports minded vehicles, on the highway at highway speeds the Z will be at 3000rpm in 6th gear going 70 (example not actual) while in a juke you might be going 70 on the highway and it will only be at 2200rpm... Its because the cars gears are set up that way.
Its most noticeable on the highway, and is something you realize especially when your Z isnt your daily driver.
My only suggestion is to up the rpm your trying to cruise around in... 3000rpm and below is your sweet spot for cruising 2000rpm is too low
I know what you mean that the 350z runs at a higher rpm then lots of non sports minded vehicles, on the highway at highway speeds the Z will be at 3000rpm in 6th gear going 70 (example not actual) while in a juke you might be going 70 on the highway and it will only be at 2200rpm... Its because the cars gears are set up that way.
Its most noticeable on the highway, and is something you realize especially when your Z isnt your daily driver.
My only suggestion is to up the rpm your trying to cruise around in... 3000rpm and below is your sweet spot for cruising 2000rpm is too low
#19
6 inch cawk is my fave!
iTrader: (3)
Here is a chart if your interested in top speed per gear
And here is a good thread for more reading if your interested...
https://my350z.com/forum/engine-and-...installed.html
And here is a good thread for more reading if your interested...
https://my350z.com/forum/engine-and-...installed.html
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Arrtus (04-27-2016)
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