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Revs dropping slowly (4sp Auto) 

 

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 Post subject: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 12:23 pm 
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Ride: 2006 BF Futura

Location: Penrith
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Hey all

I've noticed that when in neutral the revs seem to drop very slowly, I first noticed this when I fitted a K&N Filter (the old one was so old it was grey)
[EDIT] It occured before I changed the filter as well, I just did not take too much notice of it
I punched the throttle (in Neutral), the revs rose as expected but they dropped pretty slowly, taking about 8-9 seconds to drop from 4K to the 750-800 idle. I tried it again today and the same thing happened.

I'm not one to notice this normally because I don't try to rev the car so maybe it's normal, but it just seems very strange, my old car (a manual 1992 celica) dropped its revs a lot faster than what this car does.

On that note, is it something that automatic cars do? It has the 4sp auto in it. If it helps, the car is a 2006 BF Mark I Futura.

Any help with this would be greatly appreciated :)
[I could not find anything similar with the search function expect an XH ute, but if there is another thread that covers this please don't hesitate to point it out]

Last edited by peachhead101 on Mon Jun 03, 2013 8:57 pm, edited 1 time in total.

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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 8:44 pm 
Oompa Loompa
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Hi Peachhead,

So before changing the filter this problem did not exist? What sort of filter was it originally (paper or foam)?
Have you tried disconnecting the battery for at least 1 hour, then doing the re-learn procedure?
Is it consuming excessive fuel?

Cheers Mick
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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 8:49 pm 
Getting Side Ways
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it's normal.

 

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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 8:56 pm 
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Mechanic Mick wrote:
So before changing the filter this problem did not exist?

The problem existed before the filter change as well, I'll edit the original to make that clear.
Mechanic Mick wrote:
What sort of filter was it originally (paper or foam)?

It was the stock type of filter, which I think is paper.
Mechanic Mick wrote:
Have you tried disconnecting the battery for at least 1 hour, then doing the re-learn procedure?

No I have not, will try that tomorrow.
Mechanic Mick wrote:
Is it consuming excessive fuel?

No, normal fuel consumption.

89.SVO wrote:
it's normal.

Is this for just the 4sp autos or for all Falcons, is there a way to change it is so?
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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 9:01 pm 
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Mechanic Mick wrote:
then doing the re-learn procedure?

What is this re-learn procedure?
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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 9:14 pm 
Getting Side Ways
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it is so unburnt fuel doesn't go out of the exhaust. emissions

To prevent dumping of unburnt fuel into the catalytic converters. Overtime, it will damage it, leading to costly repairs. The "rev hang" slows down the sudden drop in rpm to fully burn off all excess fuel

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 9:19 pm 
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89.SVO wrote:
it is so unburnt fuel doesn't go out of the exhaust. emissions

Okay, that makes a lot of sense, is there a way to change it though? I understand it's better for emissions but it's still annoying knowing it's like that.
Or if not get rid of it, as that may damage the cat, is there a way to quicken the speed the revs drop to at least a somewhat faster speed?
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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 9:23 pm 
Getting Side Ways
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I guess you could get it tuned. But what a f**k around for a rev hang that only happens when you rev it in neutral

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Mon Jun 03, 2013 11:20 pm 
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89.SVO wrote:
I guess you could get it tuned. But what a f**k around for a rev hang that only happens when you rev it in neutral

Yeah OK, I was hoping for something easier, but if all Falcons do that and you need a tune to get rid of it it is DEFINITELY not worth it. Thanks for your help
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 Post subject: Re: Revs dropping slowly (4sp Auto)
Posted: Tue Jun 04, 2013 8:06 am 
Getting Side Ways
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all 6 cylinders from EF (Broadband Manifold) do it

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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