Much better

[t_urbo]

Holy Sh!t.

This is very interesting. This makes sense to me as I see my car having a "surge" of power up the gears at around 5,500 rpm all the way to 8,000rpm - that must be the valves opening?

At idle I could see them open, but had no idea they closed again. So I assume that the hose disconnected leaves the valves open all the time, rather than shut, or is there a procedure to ensure you disconnect the pipe when the valve is open etc etc?

So it seems bullet proof for an idoit like me PippyRips, if you do it can you reply with your thoughts? Might give this a go at the weekend. Any things to be careful of rather than clamping and covering? Again, longer term effects?

Cheers!!
Ró

The surge is mainly from the throttle bodies opening from 50-60% to 100% at 5000-5500K in the first 3 gears

[88wiff]

i have just disconnected mine, its easy anyone can do it, even an idiot like me, and im an idiot!!!

[Mori]

What my mate done was cut the pipe in half and then got 2 small bolts for each side, put them up the pipes and used 2 little clamps that he got from a VW dealer that are used as the fix for the rear window washer pipe comming apart from where it conects to the washer nozzel in the hatch.

Pics? More details on the bolts?

[RedRobert]

i have just disconnected mine, its easy anyone can do it, even an idiot like me, and im an idiot!!!

What was your view on the difference after you disconnected?

[alex_123_fra]

Does this have potential to cause any damage? Would the running of the car be affected by flap back-pressure, hence resulting in problems when removing this back-pressure at low revs?

Also, would the dealers make a fuss about it?

If not, sign me up. I'd love to know how to do it with some pictures maybe as I'm even more of an idiot than most when it comes to spanners and screw drivers.

[t_urbo]

Does this have potential to cause any damage? Would the running of the car be affected by flap back-pressure, hence resulting in problems when removing this back-pressure at low revs?

Also, would the dealers make a fuss about it?

If not, sign me up. I'd love to know how to do it with some pictures maybe as I'm even more of an idiot than most when it comes to spanners and screw drivers.

See Here http://www.rs246.com/index.php?name=PNp ... 3&start=15
4th post down

[alex_123_fra]

Does this have potential to cause any damage? Would the running of the car be affected by flap back-pressure, hence resulting in problems when removing this back-pressure at low revs?

Also, would the dealers make a fuss about it?

If not, sign me up. I'd love to know how to do it with some pictures maybe as I'm even more of an idiot than most when it comes to spanners and screw drivers.

See Here http://www.rs246.com/index.php?name=PNp ... 3&start=15
4th post down

Thanks t_urbo. So us lot with standard cars may run lean if we disconnect the flaps and let them open all the time, unless we remap to take this into account (like Jeroen).

That's kind of put me off it now

[Scoobysnack]

i've thought about this running lean issue if the flaps are open............. and i dont agree...... for 2 reasons..

- the Milltek running lean issue, wasnt that on a car with the full system and replaced cats.?? i.e a better flowed exhaust system , less restictive cats and no flaps? this would a big differnece. I remember having my Scoobie and AMG cars removed centre section and the flow didnt really effect the AFR that much. Whebn i went to the full system and cats massive differnece,

- the flaps are only restiricting one opening on each side at low revs i.e less than 5500. Isnt the fueling iisue on most (but not all ) cars at the higher revs . Above this Audi already open them so no issue up to 8250rpm

discuss

J

[Scoobysnack]

Also when the throttle only opens 50 -60% , is this the ECU ensuring it therefore giving correct fuelling or a just a paremeter that spoofs it and the fuelling still thinks its 100%??

J

[pippyrips]

good points, well made. I'm no expert but it all sounds reasonable to me. Interested to hear what the more informed think.

Out of interest what is Milteks view on fitting a cat back non-valved system without remap?

[Scoobysnack]

( As an aside point..... I've been on several forums pistonheads, scoobynet, visordown, S2ki etc and i have to say so far the people here are very polite , well informed, and can put an argument together without getting emotions involved..... )

So thumbs up you lot

J

[DoctorD]

There is no risk of damage, its only an exhaust. What is really surprising about the RS4, is that with them disconnected (i.e. valves remain fully open at all times) the car drives much more smoothly and progressively, gives better MPG and doesn't sound much louder (certainly from within the cabin). It just sounds more characterful and fun.

That's what's really daft about it, with valves disconnected it feels a much better all-round car - with no downsides whatsoever.

p.s. EVO's long termer used a standard exhaust, and now my car behaves 'exactly' as it did. I'm really glad I chanced upon this discovery.

[SR71]

If its affecting the MPG its affecting the AFR.

If its affecting the AFR, best not f**k with it unless you know what you're doing.

My $0.02.

[Mori]

I don't believe that opening the flaps at mid-rpm ranges will affect AFR enough to make a difference. Not with the stock exhaust. Any pros willing to venture more conclusive evidence?

[t_urbo]

( As an aside point..... I've been on several forums pistonheads, scoobynet, visordown, S2ki etc and i have to say so far the people here are very polite , well informed, and can put an argument together without getting emotions involved..... )

So thumbs up you lot

J