Fuse 22 (re-visited!)
Discussion
Good day everyone. I know that this topic has been discussed several times before (from doing a search mainly about the V8V). However, I thought I would ask for some recent opinion.
I have thought about removing Fuse 22 from my DB9 Volante, but up to now have held off, as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted... I am therefore more interested in a on/off fix for this, so I can decide when I want to make lots of noise and when I don't...
I have heard that AM works have fitted a switch for some cars that come through them, but I was wondering if anyone has any experience of the remote control Fuse 22 disconnection advertised on www.Fuse22.net? This sounds like the ideal solution to me, but am reluctant to part with any money on the basis of a pretty undescriptive web page.....
Grateful for thoughts/input....
I have thought about removing Fuse 22 from my DB9 Volante, but up to now have held off, as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted... I am therefore more interested in a on/off fix for this, so I can decide when I want to make lots of noise and when I don't...
I have heard that AM works have fitted a switch for some cars that come through them, but I was wondering if anyone has any experience of the remote control Fuse 22 disconnection advertised on www.Fuse22.net? This sounds like the ideal solution to me, but am reluctant to part with any money on the basis of a pretty undescriptive web page.....
Grateful for thoughts/input....
gheimann0 said:
as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted...
Nonsense I'm afraid. What do you think you'd fail? Emissions? That's all they test! It's fine in or out for the MOT.It was designed for drive by noise regulations for the factory to pass. No other reason.
BR will fit one for free in conjuction with other work I believe (i.e. service/upgrades)
gheimann0 said:
Good day everyone. I know that this topic has been discussed several times before (from doing a search mainly about the V8V). However, I thought I would ask for some recent opinion.
I have thought about removing Fuse 22 from my DB9 Volante, but up to now have held off, as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted... I am therefore more interested in a on/off fix for this, so I can decide when I want to make lots of noise and when I don't...
I have heard that AM works have fitted a switch for some cars that come through them, but I was wondering if anyone has any experience of the remote control Fuse 22 disconnection advertised on www.Fuse22.net? This sounds like the ideal solution to me, but am reluctant to part with any money on the basis of a pretty undescriptive web page.....
Grateful for thoughts/input....
I have the remote switch installed and it works fine. In the 4.3 V8V I've noticed a slight drop in low-down torque when fuse22 is "disengaged" so I prefer to have the option of switching it at will. One tip - you need to find a good earth when fitting the remote switch. It's easy on the coupe, but there's no convenient bolt nearby on the roadster.I have thought about removing Fuse 22 from my DB9 Volante, but up to now have held off, as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted... I am therefore more interested in a on/off fix for this, so I can decide when I want to make lots of noise and when I don't...
I have heard that AM works have fitted a switch for some cars that come through them, but I was wondering if anyone has any experience of the remote control Fuse 22 disconnection advertised on www.Fuse22.net? This sounds like the ideal solution to me, but am reluctant to part with any money on the basis of a pretty undescriptive web page.....
Grateful for thoughts/input....
toofastforme said:
gheimann0 said:
Good day everyone. I know that this topic has been discussed several times before (from doing a search mainly about the V8V). However, I thought I would ask for some recent opinion.
I have thought about removing Fuse 22 from my DB9 Volante, but up to now have held off, as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted... I am therefore more interested in a on/off fix for this, so I can decide when I want to make lots of noise and when I don't...
I have heard that AM works have fitted a switch for some cars that come through them, but I was wondering if anyone has any experience of the remote control Fuse 22 disconnection advertised on www.Fuse22.net? This sounds like the ideal solution to me, but am reluctant to part with any money on the basis of a pretty undescriptive web page.....
Grateful for thoughts/input....
I have the remote switch installed and it works fine. In the 4.3 V8V I've noticed a slight drop in low-down torque when fuse22 is "disengaged" so I prefer to have the option of switching it at will. One tip - you need to find a good earth when fitting the remote switch. It's easy on the coupe, but there's no convenient bolt nearby on the roadster.I have thought about removing Fuse 22 from my DB9 Volante, but up to now have held off, as I know in order to pass an MOT (in theory) the fuse would need to be re-fitted... I am therefore more interested in a on/off fix for this, so I can decide when I want to make lots of noise and when I don't...
I have heard that AM works have fitted a switch for some cars that come through them, but I was wondering if anyone has any experience of the remote control Fuse 22 disconnection advertised on www.Fuse22.net? This sounds like the ideal solution to me, but am reluctant to part with any money on the basis of a pretty undescriptive web page.....
Grateful for thoughts/input....
George H said:
What's that then, like a post 50th health check? 
That's 2 days on the trot you've blind-sided me Georgio.
You can get your own costco oil for that
BTW Mr G, if a new member needs a bit of info on a topic that has been discussed previously, would it not be the gentlemanly approach to at least point him in the right direction
Fully agree with Jockman!
We're all supposed to be gentlemen here and we always remember the pride of the first days with the Aston and the fear to do anything wrong.
Confidence take some time to come (and pride remains!)
I confirm there is no problem to take the fuse out and that there are some cheap alternatives for fitting a switch or a even a remote.
I personnaly opted for a self made switch that remains in the battery compartment linked to the fuse holder by wire.
I can switch on/off in seconds even when seated and don't have to cope with one more remote (21th century men are surrouded by so many remote controls). No holes, no visible wires, no harsch...
Anyway I must admit that I even took the rear parcel shelf out to get more noise inside! I barely switched the fuse on since then!
The 4.7 V8V is loud, just fantastically and elegantly loud.
A gentleman's car!
We're all supposed to be gentlemen here and we always remember the pride of the first days with the Aston and the fear to do anything wrong.
Confidence take some time to come (and pride remains!)
I confirm there is no problem to take the fuse out and that there are some cheap alternatives for fitting a switch or a even a remote.
I personnaly opted for a self made switch that remains in the battery compartment linked to the fuse holder by wire.
I can switch on/off in seconds even when seated and don't have to cope with one more remote (21th century men are surrouded by so many remote controls). No holes, no visible wires, no harsch...
Anyway I must admit that I even took the rear parcel shelf out to get more noise inside! I barely switched the fuse on since then!
The 4.7 V8V is loud, just fantastically and elegantly loud.
A gentleman's car!
Thanks all for the responses.... and thanks Jockman for standing up for a newbie....(to this forum anayway). Just for Mr G to understand, I did say "I know this has been discussed several time before" but I wondered if there was any more recent opinion above and beyond previous discussions.....!! Never did like relying to much on historical info!
BTW, whilst a decibel test is not a "standard" part of the MOT, the examiner can decide to do one if he believes your exhaust is too noisy. Also a police officer can demand a test and issue a vehicle retification requirement if he stops you for excessive noise, it is also possible to do a roadside test of decibel noise (although exceptionally rare). The law also says that an exhaust system must not be altered to make it louder than standard...the question is, is removing fuse 22 modifying the exhaust system? Ironically, you can fit a louder exhaust system to your car (AKA spotty teen in a beat up pug with a dustbin exhaust fitted) as long as the actual system itself isn't modified.. Whoever said the law made sense....
Believe me, I should know.....
BTW, whilst a decibel test is not a "standard" part of the MOT, the examiner can decide to do one if he believes your exhaust is too noisy. Also a police officer can demand a test and issue a vehicle retification requirement if he stops you for excessive noise, it is also possible to do a roadside test of decibel noise (although exceptionally rare). The law also says that an exhaust system must not be altered to make it louder than standard...the question is, is removing fuse 22 modifying the exhaust system? Ironically, you can fit a louder exhaust system to your car (AKA spotty teen in a beat up pug with a dustbin exhaust fitted) as long as the actual system itself isn't modified.. Whoever said the law made sense....
Believe me, I should know.....
Giles - I have copied a section from Mike's Bamford Rose sticky above and it reads thus...
Fuse 22:
Loss of low speed torque when fuse 22 is removed - there is None - exhaust bypass valves open Vs closed returns the same torque output. On a 4.7L 10% torque loss is approx. 50Nm, the report of this sort of loss by removal of fuse 22 is quite outrageous.
The bypass valves are present for one reason, and one reason ONLY - so the vehicle can pass noise drive-by test. The car is tested on a controlled surface which is in controlled surroundings making noise recording very accurate. The total noise the car produces is measured at a start gate, around 30MPH in third gear, the car then accelerates at full throttle to around 55MPH where the test terminates at the end gate. The engine speed and load (volumetric efficiency) conditions the car is operated under during this test defines how the exhaust bypass valves are controlled by the EMS. The exhaust bypass valves only purpose is to effectively cheat the test and gain a noise drive-by test pass for an exhaust system that would otherwise fail, being too loud.
Exhaust back pressure at the conditions where the bypass valves operate is so low as to be immeasurable, this means that open or closed the bypass valves will have no consequence over torque output. However, that statement would be wrong if the bypass valves were closed after anything above around 4000 rpm full throttle, where torque output would be reduced.
Removing fuse 22 electronically inhibits operation of the vacuum pump which controls the valves. The default position of the valves is 'open', so by disabling the system the valves simply sit in their default position. Prolonged usage with the valves at default open position is highly unlikely to seize or stick the valves should they be operated at some point in the future. I have also read elsewhere owners have been advised not to remove fuse 22 as they have been told it creates fault codes which disrupt the diagnostic system, or somehow creates other (electronic / mechanical) faults - Rubbish... All that happens is a PCode is simply registered within the modules history to state electronic control of the valves was not possible, this code does not illuminate the yellow 'check engine' light on the dash.
In summary - remove the fuse and enjoy the soundtrack.....!!!
...if you could possibly translate it into Gaelic for me I would be most grateful
Fuse 22:
Loss of low speed torque when fuse 22 is removed - there is None - exhaust bypass valves open Vs closed returns the same torque output. On a 4.7L 10% torque loss is approx. 50Nm, the report of this sort of loss by removal of fuse 22 is quite outrageous.
The bypass valves are present for one reason, and one reason ONLY - so the vehicle can pass noise drive-by test. The car is tested on a controlled surface which is in controlled surroundings making noise recording very accurate. The total noise the car produces is measured at a start gate, around 30MPH in third gear, the car then accelerates at full throttle to around 55MPH where the test terminates at the end gate. The engine speed and load (volumetric efficiency) conditions the car is operated under during this test defines how the exhaust bypass valves are controlled by the EMS. The exhaust bypass valves only purpose is to effectively cheat the test and gain a noise drive-by test pass for an exhaust system that would otherwise fail, being too loud.
Exhaust back pressure at the conditions where the bypass valves operate is so low as to be immeasurable, this means that open or closed the bypass valves will have no consequence over torque output. However, that statement would be wrong if the bypass valves were closed after anything above around 4000 rpm full throttle, where torque output would be reduced.
Removing fuse 22 electronically inhibits operation of the vacuum pump which controls the valves. The default position of the valves is 'open', so by disabling the system the valves simply sit in their default position. Prolonged usage with the valves at default open position is highly unlikely to seize or stick the valves should they be operated at some point in the future. I have also read elsewhere owners have been advised not to remove fuse 22 as they have been told it creates fault codes which disrupt the diagnostic system, or somehow creates other (electronic / mechanical) faults - Rubbish... All that happens is a PCode is simply registered within the modules history to state electronic control of the valves was not possible, this code does not illuminate the yellow 'check engine' light on the dash.
In summary - remove the fuse and enjoy the soundtrack.....!!!
...if you could possibly translate it into Gaelic for me I would be most grateful
Jockman said:
...if you could possibly translate it into Gaelic for me I would be most grateful
Fuse 22: loss ay law speed torque when fuse 22 is removed - thaur is nane - exhaoost bypass valves open vs closed returns th' sam torque ootput. oan a fuir.7l 10% torque loss is approx. 50nm, th' report ay thes sort ay loss by removal ay fuse 22 is quite ootrageoos. the bypass valves ur present fur a body reason, an' a body reason only - sae th' vehicle can pass stooshie drive-by test. th' motur is tested oan a controlled surface which is in controlled surroondings makin' stooshie recordin' huir uv a accurate. th' total stooshie th' motur produces is measured at a start gate, aroond 30mph in third gear, th' motur 'en accelerates at foo throttle tae aroond 55mph whaur th' test terminates at th' end gate. th' engine speed an' load (volumetric efficiency) conditions th' motur is operated under durin' thes test defines hoo th' exhaoost bypass valves ur controlled by th' ems. th' exhaoost bypass valves only purpose is tae effectively cheat th' test an' gain a stooshie drive-by test pass fur an exhaoost system 'at woods otherwise fail, bein' tay lood. exhaoost back pressure at th' conditions whaur th' bypass valves operate is sae law as tae be immeasurable, thes means 'at open ur closed th' bypass valves will hae nae consequence ower torque ootput. however, 'at statement woods be wrang if th' bypass valves waur closed efter anythin' abune aroond 4000 rpm foo throttle, whaur torque ootput woods be reduced. removin' fuse 22 electronically inhibits operation ay th' vacuum pump which controls th' valves. th' default position ay th' valves is 'open', sae by disablin' th' system th' valves simply sit in their default position. prolonged usage wi' th' valves at default open position is highly jobbie tae seize ur stick th' valves shoods they be operated at some point in th' future. Ah hae also reid elsewhaur owners hae bin advised nae tae remove fuse 22 as they hae bin tauld it creates faut codes which disrupt th' diagnostic system, ur somehaw creates other (electronic / mechanical) faults - naf... aw 'at happens is a pcode is simply registered within th' modules history tae state electronic control ay th' valves wisnae possible, thes code disnae illuminate th' yella' 'check engine' lecht oan th' dash. in summary - remove th' fuse an' enjoy th' soondtrack.....!!!http://www.whoohoo.co.uk/scottish-translator.asp
Gassing Station | Aston Martin | Top of Page | What's New | My Stuff