Power usage = RPM drops

goixiz · 10-11-2008, 03:03 PM

When at idle the car is at about 650-675 rpm with AC off
And when i turn on the lights or wind the windows down - power usage
The RPM drops for a second to 600-625 or so. Is there something that can be done or something i can add on to avoid this

Thanks is advance

radiocontrolhead · 10-11-2008, 03:48 PM

That's normal. It sholdn't drop over a hundred RPM. If I turn the AC on which draws the most amps and puts another load on the engine, the rpm needle just glitches. Definitely doesn't dip below a 100 rpm.

raybyduhbay · 10-11-2008, 04:11 PM

I think that it does drop below 100rpm for a very split second when you turn on the AC because of the Momentary draw in extra load. ob course we have to remember that this isnt to say that it is going to spin 100 less cyles in 1 minutes, hence Rate Per Minute as alot of us will think about it in that way. So lets say your car idles at 600 rpm that would mean the car would make 10 cycles every second. when you turn on the A/C then perhaps that draw in extra load will cause it to "skip" a cycle because of the extra load Thus you get 9 cycles in that second instead so that is why it would show up as 540 RPM for that brief second

goixiz · 10-11-2008, 04:53 PM

I have a scangauge connected
so i can see the RPM a lot more accurately than the dash needle and it does drop more than 100 rpm and the timing changes as well

I was wndering if there is something out there that dampens this effect so its not so prominent

redpepSi · 10-11-2008, 05:07 PM

Pulleys.

goixiz · 10-12-2008, 08:18 AM

Anyway of DIY to adjust the idle RPM ?

BigT · 10-12-2008, 09:16 AM

Quote:

Originally Posted by goixiz

Anyway of DIY to adjust the idle RPM ?

Unfortunately (to a lot of people at least) the idle is not easily adjustable. The idle speed is controlled by the ECU and DBW actuator. Changing the idle would require reprogramming the ECU.

ryker · 10-12-2008, 09:44 AM

Get a V8.

Other than that don't worry. Honda knows how to build engines.

GSXRSpeed · 10-12-2008, 10:07 AM

Quote:

Originally Posted by ryker

Get a V8.

Other than that don't worry. Honda knows how to build engines.

My last car was a HEMI Ram truck and the idle drop was horrible when I ran lights windows or AC. Worse than my SI.

It's normal on any car I would think. I can't imagine a way to get rid of it. Any time you put extra load on anything it's gonna slow down at least for a split second while it adjusts to the new load.

humboldt1498 · 10-12-2008, 02:23 PM

It is perfectly normal. You hard putting more load on the motor so it has to work harder.

Itchytoe · 10-12-2008, 04:21 PM

Quote:

Originally Posted by GSXRSpeed

My last car was a HEMI Ram truck and the idle drop was horrible when I ran lights windows or AC. Worse than my SI.

That was your problem. Dodge is just as horrible as it's always been. Don't get a Dodge. There's a reason they're so cheap.
Also, I like how your last car was a truck. Got a pic of the cartruck?

phatmax_666 · 10-12-2008, 04:28 PM

Quote:

Originally Posted by goixiz

I have a scangauge connected
so i can see the RPM a lot more accurately than the dash needle and it does drop more than 100 rpm and the timing changes as well

I was wndering if there is something out there that dampens this effect so its not so prominent

Get an a/c p/s remover kit ... wil solve the problem as it seem one for you !

insole23 · 10-12-2008, 05:06 PM

Ok so Im driving on the freeway you know my daily usuall routes to work 15 to 20 minutes. Usually once I get off the freeway and I stop at the first light my car idles correct and then the car suddenly bleeps or revs to 1k and drops back down. I saw it last night when I was paying attention to it. The RPMS drop like its about to stall and then bleeps back up? Does anyone know if this is regular or has this happened to someone else?? Theres no ac or anything. This has been happening for 2 weeks.

udumkid · 10-12-2008, 05:12 PM

Quote:

Originally Posted by insole23

Ok so Im driving on the freeway you know my daily usuall routes to work 15 to 20 minutes. Usually once I get off the freeway and I stop at the first light my car idles correct and then the car suddenly bleeps or revs to 1k and drops back down. I saw it last night when I was paying attention to it. The RPMS drop like its about to stall and then bleeps back up? Does anyone know if this is regular or has this happened to someone else?? Theres no ac or anything. This has been happening for 2 weeks.

Stock intake?

insole23 · 10-12-2008, 05:21 PM

yeah everything is complete stock.. nothing done to it. its not like a big rev. but it goes down and goes up. feels like I touched the pedal but i didnt

insole23 · 10-12-2008, 05:22 PM

actually I have a K&N drop in? would that have anything to do with it?

raybyduhbay · 10-12-2008, 05:30 PM

DBW actuator!!! thats the solution I THINK. why not just adjust the bolts on the gas pedal so that it increases the gas a small amount then when you are idling it will idle a lil higher. Perhaps maybe it used to be at the proper adjustment and now that you mashed on the gas pedal so much that the screw is loosening out?

udumkid · 10-12-2008, 05:39 PM

Quote:

Originally Posted by insole23

actually I have a K&N drop in? would that have anything to do with it?

From past experiences I can tell you that aftermarket intakes tend to throw the idle of a little.. If you search for Idle hunt you will see that one of the ones that tend to do this more than others will be the Fuita Sri....

Also one other thing that may cause idle hunt will be if the car has not had the idle learn procedure done after ANY kind of mod is done to the car...

insole23 · 10-12-2008, 11:19 PM

Quote:

Originally Posted by raybyduhbay

DBW actuator!!! thats the solution I THINK. why not just adjust the bolts on the gas pedal so that it increases the gas a small amount then when you are idling it will idle a lil higher. Perhaps maybe it used to be at the proper adjustment and now that you mashed on the gas pedal so much that the screw is loosening out?

I actually never really smashed my gas pedal to the floor. twice I can count I have. I really love my car and want it to last for awhile. So no vtecing to much especially the gas. But I will take that into account

Quote:

Originally Posted by udumkid

From past experiences I can tell you that aftermarket intakes tend to throw the idle of a little.. If you search for Idle hunt you will see that one of the ones that tend to do this more than others will be the Fuita Sri....

Also one other thing that may cause idle hunt will be if the car has not had the idle learn procedure done after ANY kind of mod is done to the car...

ok for sure. I think i might switch back to my stock drop in filter, and see if it does this. Maybe clean my K and N. Ill research it though. ANYONE ELSE KNOW WHAT IT COULD BE?

insole23 · 10-13-2008, 01:21 PM

so any others input

10-11-2008, 03:03 PM	#1 (permalink)
goixiz Senior Member Join Date: Aug 2007 Posts: 143 iTrader: 1 / 100%	Power usage = RPM drops When at idle the car is at about 650-675 rpm with AC off And when i turn on the lights or wind the windows down - power usage The RPM drops for a second to 600-625 or so. Is there something that can be done or something i can add on to avoid this Thanks is advance

10-11-2008, 04:53 PM	#4 (permalink)
goixiz Senior Member Join Date: Aug 2007 Posts: 143 iTrader: 1 / 100%	scangauge I have a scangauge connected so i can see the RPM a lot more accurately than the dash needle and it does drop more than 100 rpm and the timing changes as well I was wndering if there is something out there that dampens this effect so its not so prominent

10-12-2008, 05:06 PM	#13 (permalink)
insole23 Senior Member Join Date: Feb 2008 Posts: 1,848 iTrader: 1 / 100%	car feels like it stalls Ok so Im driving on the freeway you know my daily usuall routes to work 15 to 20 minutes. Usually once I get off the freeway and I stop at the first light my car idles correct and then the car suddenly bleeps or revs to 1k and drops back down. I saw it last night when I was paying attention to it. The RPMS drop like its about to stall and then bleeps back up? Does anyone know if this is regular or has this happened to someone else?? Theres no ac or anything. This has been happening for 2 weeks.

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10-11-2008, 03:48 PM	#2 (permalink)
radiocontrolhead Senior Member Join Date: Apr 2006 Location: Hollywood, ca Age: 22 Posts: 2,935 Danny iTrader: 0 / 0%	That's normal. It sholdn't drop over a hundred RPM. If I turn the AC on which draws the most amps and puts another load on the engine, the rpm needle just glitches. Definitely doesn't dip below a 100 rpm.

10-11-2008, 04:11 PM	#3 (permalink)
raybyduhbay Senior Member Join Date: Mar 2007 Location: Bay Area Posts: 1,086 Ray iTrader: 10 / 100%	I think that it does drop below 100rpm for a very split second when you turn on the AC because of the Momentary draw in extra load. ob course we have to remember that this isnt to say that it is going to spin 100 less cyles in 1 minutes, hence Rate Per Minute as alot of us will think about it in that way. So lets say your car idles at 600 rpm that would mean the car would make 10 cycles every second. when you turn on the A/C then perhaps that draw in extra load will cause it to "skip" a cycle because of the extra load Thus you get 9 cycles in that second instead so that is why it would show up as 540 RPM for that brief second

10-11-2008, 05:07 PM	#5 (permalink)
redpepSi Senior Member Join Date: Jun 2007 Location: austin, tx Posts: 1,947 dck... iTrader: 1 / 100%	Pulleys.

10-12-2008, 08:18 AM	#6 (permalink)
goixiz Senior Member Join Date: Aug 2007 Posts: 143 iTrader: 1 / 100%	Anyway of DIY to adjust the idle RPM ?

10-12-2008, 09:44 AM	#8 (permalink)
ryker Senior Member Join Date: Sep 2007 Posts: 5,904 iTrader: 1 / 100%	Get a V8. Other than that don't worry. Honda knows how to build engines.

10-12-2008, 02:23 PM	#10 (permalink)
humboldt1498 Senior Member Join Date: Apr 2008 Location: Humboldt Posts: 1,304 iTrader: 3 / 100%	It is perfectly normal. You hard putting more load on the motor so it has to work harder.

10-12-2008, 05:21 PM	#15 (permalink)
insole23 Senior Member Join Date: Feb 2008 Posts: 1,848 iTrader: 1 / 100%	yeah everything is complete stock.. nothing done to it. its not like a big rev. but it goes down and goes up. feels like I touched the pedal but i didnt

10-12-2008, 05:22 PM	#16 (permalink)
insole23 Senior Member Join Date: Feb 2008 Posts: 1,848 iTrader: 1 / 100%	actually I have a K&N drop in? would that have anything to do with it?

10-12-2008, 05:30 PM	#17 (permalink)
raybyduhbay Senior Member Join Date: Mar 2007 Location: Bay Area Posts: 1,086 Ray iTrader: 10 / 100%	DBW actuator!!! thats the solution I THINK. why not just adjust the bolts on the gas pedal so that it increases the gas a small amount then when you are idling it will idle a lil higher. Perhaps maybe it used to be at the proper adjustment and now that you mashed on the gas pedal so much that the screw is loosening out?

10-13-2008, 01:21 PM	#20 (permalink)
insole23 Senior Member Join Date: Feb 2008 Posts: 1,848 iTrader: 1 / 100%	so any others input