Best Default Idle RPM for a Car?

Narencar · 17th February 2009, 09:39

What should be the best rpm for the car in idle mode which is always set by the manufacturer?
I am having two cars one is Wagon R Vxi which has a rpm meter and the other one is Santro which don't.According to the wagon r the idle rpm is set 500 as default but in santro i am not be able to determine as most of the times when i driving the santro i feels that the rpm is more in idle mode.

iceman91 · 17th February 2009, 09:51

Each car has a different setting. some are 500rpm some are 700,800 etc. just like how every car is different so is their parameters

the_maassk · 17th February 2009, 09:52

I think there is no standard default. It would vary between manufacturers. Also, even within cars of the same model and make, the idling RPM would differ (and would be tuned). My U-VA idles at aound 800.

leadf00t · 17th February 2009, 10:21

its best to look in the user manual or maybe ask your service advisor.

my lancer idles at 800 without ac and 900 with ac.

schumi2508 · 2nd May 2009, 21:57

hey guys
i have a problem here. please help me out.
i have a esteem vx 2001 mpfi
now when i start the car it starts but the idle rpm stays around 100-200 and within seconds the car shuts down
even if i manage to make the car running, the moment i pull my leg off the accelerator the rpm rushes back to 100-200 and the car shuts down.
please help me out as to what is the problem and what could be the solution
thanks

drpullockaran · 2nd May 2009, 23:17

Quote:

Originally Posted by schumi2508

hey guys

even if i manage to make the car running, the moment i pull my leg off the accelerator the rpm rushes back to 100-200 and the car shuts down.
please help me out as to what is the problem and what could be the solution
thanks

Get your throttle body cleaned with special attention being given to cleaning the orifice of the idling actuators auxilliary orifice. Make sure that your idling actuator's stepper motor is working.

Idling rpm is based on the weight of the rotating mass or in common parlance flywheels weight which is why the Enfield bullet has a low low idling rpm because it has a huge flywheel. Race cars have very low rotating mass and hence their high idling rpm and very difficult to control throttle at low rpm's. you would have seen many ex[ert race drivers bogging doen their engines at the start grid and also when at teh pit stop.

mohan41 · 5th September 2009, 23:00

Is it possible to increase the idle RPM easily?

My getz' idle RPM is about 700 RPM. Due to its poor low end torque, in slow moving traffic I cannot get the car to pull just by releasing clutch (on inclines). I have to sometimes use the accelerator too and rev the engine. Compared to this, the Santro I was driving earlier would move most of the times with just the release of appropriate amount of clutch. I agree that the lesser weight of Santro and different gearing could be the primary reasons, but I think increasing idle RPM in the getz should provide some more torque using only clutch. I may be wrong here.

Also I guess increasing idle RPM would bring down FE, but I hope it wont be too much.

17th February 2009, 09:39	#1
Narencar Newbie Join Date: Feb 2009 Location: New Delhi Posts: 19 Thanked: 49 Times	Best Default Idle RPM for a Car? What should be the best rpm for the car in idle mode which is always set by the manufacturer? I am having two cars one is Wagon R Vxi which has a rpm meter and the other one is Santro which don't.According to the wagon r the idle rpm is set 500 as default but in santro i am not be able to determine as most of the times when i driving the santro i feels that the rpm is more in idle mode.
	() Thanks

17th February 2009, 09:51	#2
iceman91 Senior - BHPian Join Date: Nov 2004 Location: melbourne/banga Posts: 1,961 Thanked: 34 Times View My Garage	Each car has a different setting. some are 500rpm some are 700,800 etc. just like how every car is different so is their parameters
	() Thanks

17th February 2009, 09:52	#3
the_maassk BHPian Join Date: Sep 2008 Location: Vadodara/ NG7 2QP Posts: 205 Thanked: 6 Times View My Garage	I think there is no standard default. It would vary between manufacturers. Also, even within cars of the same model and make, the idling RPM would differ (and would be tuned). My U-VA idles at aound 800.
	() Thanks

17th February 2009, 10:21	#4
leadf00t BHPian Join Date: Oct 2007 Location: MH04 Posts: 439 Thanked: 15 Times View My Garage	its best to look in the user manual or maybe ask your service advisor. my lancer idles at 800 without ac and 900 with ac.
	() Thanks

2nd May 2009, 21:57	#5
schumi2508 Newbie Join Date: Dec 2007 Location: Mumbai Posts: 12 Thanked: Once	hey guys i have a problem here. please help me out. i have a esteem vx 2001 mpfi now when i start the car it starts but the idle rpm stays around 100-200 and within seconds the car shuts down even if i manage to make the car running, the moment i pull my leg off the accelerator the rpm rushes back to 100-200 and the car shuts down. please help me out as to what is the problem and what could be the solution thanks
	() Thanks

5th September 2009, 23:00	#7
mohan41 BHPian Join Date: Aug 2009 Location: Bangalore Posts: 527 Thanked: 217 Times	Is it possible to increase the idle RPM easily? My getz' idle RPM is about 700 RPM. Due to its poor low end torque, in slow moving traffic I cannot get the car to pull just by releasing clutch (on inclines). I have to sometimes use the accelerator too and rev the engine. Compared to this, the Santro I was driving earlier would move most of the times with just the release of appropriate amount of clutch. I agree that the lesser weight of Santro and different gearing could be the primary reasons, but I think increasing idle RPM in the getz should provide some more torque using only clutch. I may be wrong here. Also I guess increasing idle RPM would bring down FE, but I hope it wont be too much.
	() Thanks