Exhaust rasp has gone after air inlet changed.2.2i
Exhaust rasp has gone after air inlet changed.2.2i
hi,
Indy changed cracked air inlet boot(downstream Maf). He couldn't buy exact boot,so he fitted one without a bottom bellows(2inch dia)which was fitted to a box adjacent main air box,which didn't appear to do anything.But now it has lost its lovely rasp on acceleration.Is this possible or is it a coincidence?
My car is a 2001 2.2i z3roadster
Indy changed cracked air inlet boot(downstream Maf). He couldn't buy exact boot,so he fitted one without a bottom bellows(2inch dia)which was fitted to a box adjacent main air box,which didn't appear to do anything.But now it has lost its lovely rasp on acceleration.Is this possible or is it a coincidence?
My car is a 2001 2.2i z3roadster
Re: Exhaust rasp has gone after air inlet changed.2.2i
These are still available from dealers and off ebay,
don't understand why he said they are not available, unless he couldn't be bothered to get one and is stringing you a line.....
see here:
linky 1
linky 2
don't understand why he said they are not available, unless he couldn't be bothered to get one and is stringing you a line.....
see here:
linky 1
linky 2
Z3 2.8 Progress Journal (Mine)
Z3 1.9 Sport Progress Journal (Wifey's)
I have an element of 'M-styling' on my car, If that's a good enough reason for the manufacturers to adorn a 320 with the M badge, then its certainly a good enough reason for me..
Re: Exhaust rasp has gone after air inlet changed.2.2i
My Indy fitted a new boot- part number 13541705209 but is not the same as the original. Yet the dealers got the part number from the chassi and the registration.Now that he has got the old boot he will take it to the dealers to get a exact match.
Re: Exhaust rasp has gone after air inlet changed.2.2i
Most people hear induction roar and think that it is exhaust roar.
Induction roar is actually a bad thing - performance wise. It is caused by turbulent air in the intake system.
Now that your system has been repaired and the leak has been cured, the flow will be be efficient as it won't be interrupted by air from the leak causing turbulence.
Think of it like a river that has a stream flowing into it. You can hear the water mixing as the stream flows into the river. Now the stream has been dammed and the river can run more efficiently.
Induction roar is actually a bad thing - performance wise. It is caused by turbulent air in the intake system.
Now that your system has been repaired and the leak has been cured, the flow will be be efficient as it won't be interrupted by air from the leak causing turbulence.
Think of it like a river that has a stream flowing into it. You can hear the water mixing as the stream flows into the river. Now the stream has been dammed and the river can run more efficiently.
Pingu
Re: Exhaust rasp has gone after air inlet changed.2.2i
Initially the car had poor performance,but occasionally it would fly plus a rasping exhaust.I took it to my Indy and he found cracks in the bellows of the upper air inlet boot, so he poured supaglue into the cracks ,the car was transformed.Bags of power and that lovely exhaust rasp.So he booked me in to have the upper boot replaced.He had already sent back a boot that was not Oem .The new boot has one branch off for vaccum use.The old one has two branches off,one for vaccum and the other is fed into a closed box.
Re: Exhaust rasp has gone after air inlet changed.2.2i
I would think the one to the closed box goes to the flap in the exhaust which opens under full load. ie high vacuum in the inlet.
http://www.realoem.com/bmw/enUS/showpar ... Id=18_0383
http://www.realoem.com/bmw/enUS/showpar ... Id=18_0383
Brian
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
Re: Exhaust rasp has gone after air inlet changed.2.2i
my z3 2.2 post face lift has a two parts of hose after the maf sensor, the 1st bit has a small pipe going to the air box the second part has a pipe that goes some where else (to dark to see where) but I think it goes to the top of the engine, on mine it had been running on some thing and had holes in it causing the engine light to come on(cleared by robert t, cheers) got a new one off eBay just got to fit it, don't know if I will get my rasp back as well as that had disappeared
peter2b
peter2b
Re: Exhaust rasp has gone after air inlet changed.2.2i
We changed this part on our car, it's just a closed resonator box which made no difference when it was missing on our replacement pipe-our 2.2 doesn't have an exhaust valve either.Brian4 wrote:I would think the one to the closed box goes to the flap in the exhaust which opens under full load. ie high vacuum in the inlet.
http://www.realoem.com/bmw/enUS/showpar ... Id=18_0383
It sounds great all the time!
Regards
Re: Exhaust rasp has gone after air inlet changed.2.2i
It might well be a vacuum takeoff, but the exhaust flap is not operated by an increase in vacuum, but rather by an electric valve that cuts in at a given rev limit, thus allowing the vacuum to operate the flap.Brian4 wrote:I would think the one to the closed box goes to the flap in the exhaust which opens under full load. ie high vacuum in the inlet.
On my car (M44 1.9) the small hose comes off the main air intake hose disappears under the intake manifold and according to RealOEM, connects to the fuel injection unit: http://bmwfans.info/parts-catalog/Z3-Ro ... ion_valve/
Cheers R.
Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
Re: Exhaust rasp has gone after air inlet changed.2.2i
As said already, vacuum leak may provide an induction rasp but the combustion mixture will be weaker with too much air. A weak mixture = less power.
Re: Exhaust rasp has gone after air inlet changed.2.2i
2.2 does not have the exhaust flap. Wide open all the time. Lovely sound To go with the lovely smooth engine.
Re: Exhaust rasp has gone after air inlet changed.2.2i
Zed Free wrote:2.2 does not have the exhaust flap. Wide open all the time. Lovely sound To go with the lovely smooth engine.
Same as my 3.0 auto great sound 6 cylinders on song.
Brian
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
Re: Exhaust rasp has gone after air inlet changed.2.2i
The 3.0 auto does have the exhaust flap, at least my 2001 certainly does.
Regards
Regards
Re: Exhaust rasp has gone after air inlet changed.2.2i
The plot thickens cos mine has the pipework and electric valve but no flap or actuator in the rear pipes. It is the original exhaust or at least a one piece exhaust and real OEM says that they are not fitted to auto cars. mine is a year 2000 model.
Brian
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
Re: Exhaust rasp has gone after air inlet changed.2.2i
Mine does not have one either, where is the electric valve situated Brian?Brian4 wrote:The plot thickens cos mine has the pipework and electric valve but no flap or actuator in the rear pipes. It is the original exhaust or at least a one piece exhaust and real OEM says that they are not fitted to auto cars. mine is a year 2000 model.
Re: Exhaust rasp has gone after air inlet changed.2.2i
It's me you need to be asking, Brian, as I brought it up. I believe it is in the boot somewhere. You can see it on the diagram here: http://bmwfans.info/parts-catalog/Z3-Ro ... #7810831_5Brian H wrote:Mine does not have one either, where is the electric valve situated Brian?
It list all kinds of models with the valves fitted, which is weird, as the 1.9 only has a single tailpipe! The main implication from the diagram is that it was fitted from September 1998 onwards. I honestly don't know which models got it.
Cheers R.
Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
Re: Exhaust rasp has gone after air inlet changed.2.2i
Had a look at the link Robert, the valve is not on the list for my VIN.
Re: Exhaust rasp has gone after air inlet changed.2.2i
Robert why ask you when you don't know where it is.
The flap is in the well behind the left rear wheel. It is a small black box with 2 vac pipes and 2 wires. It works from the vacuum in the inlet manifold and the electric opens the valve to allow the vacuum to the flap valve on the right hand of the two tail pipes which in effect bypasses the rear silencer.
just been checking and the valve is he same as the one that operates the engine mounts on our 5 series.
real oem for my vin no
http://www.realoem.com/bmw/enUS/showpar ... Id=18_0383
The flap is in the well behind the left rear wheel. It is a small black box with 2 vac pipes and 2 wires. It works from the vacuum in the inlet manifold and the electric opens the valve to allow the vacuum to the flap valve on the right hand of the two tail pipes which in effect bypasses the rear silencer.
just been checking and the valve is he same as the one that operates the engine mounts on our 5 series.
real oem for my vin no
http://www.realoem.com/bmw/enUS/showpar ... Id=18_0383
Brian
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
3.0I Topaz Blue
2000 E36/7 Z3 3.0i
2016 F31 335d
2015 F21 118i
Re: Exhaust rasp has gone after air inlet changed.2.2i
hi,my indi changed the air induction boot ...part number 13541435625 apparently made for the 5 series bmw.the rasp sound is back and so too is the power, am well pleased.