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#1
14th February 2012, 01:48 PM
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would it work if i installed the standard centre box back on and kept the rest from the back ok with the quads or is it the back box that takes away the drone ?
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#2
14th February 2012, 03:21 PM
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I don't know mate and i'm not sure how to work it out except trial and error.
__________________
1996 A8 4.2 QS. Bose, Solar roof, um...um... rally sport towbar. Now gone to a new home as the Traders 8. Bright yellow bus o love.
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#3
14th February 2012, 05:14 PM
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its so hard living in the sticks when there is nothing around hear i have to travel a minimum of 80miles to get any fabrication done, im just wandering what makes the A8 or S8 so quiet is it the back box or the centre box that takes away the drone
?
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#4
15th February 2012, 07:33 AM
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How many cylinders fire in one revolution on the 4.2 ? im trying to work out the engine rpm x number of cylinders fireing in one revolution/60 or 2000 in order to work out the frequency witch will= the lenth of any resonators i put on, for example 133hz would be 2.25"x28" at any bend or shape so long as its capped
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#5
15th February 2012, 08:06 AM
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Surely it's a 4-stroke V8 engine so half (i.e. 4) fire on each revolution?
So at 1500rpm you get 6000/60 = 100 fired per second.
__________________
2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions and extended leather. Ski hatch retrofit. Aftermarket reversing camera. DVB-T and XCarlink now removed as redundant. 2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (Even rarer than a D2 S8!) Oh, and a brand new engine at just under 30,000 miles on the factory one!  Finally: gone, but not forgotten..... 1998 D2 PF S8. Agate Grey/Platinum. Every option (I think) except electric rear seats, Tiptronic steering wheel, ski hatch, towbar & dimming door mirrors. e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon. Added Auto-dim mirror, Leather seats, Trip computer, Cruise control, OEM Ford SatNav with CD changer. And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850! 
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#6
15th February 2012, 08:35 AM
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just spoke to mike and he is fairly sure the problem or rather the cure is to re-install the centre box as that contains the resonating chamber and hopefully that will solve my problem
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#7
19th February 2012, 08:51 PM
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Well its all done now its almost back to standard but of course i have kept the quads on there so there is no drone any more only a slight one very quiet again but when you give it some beans its a lovely V8 sound im in the middle of getting pipercross to make an induction kit for the S8 and A8 4.2 engine should be with me on tuesday or wednesday next week so i will report in with the result i think it will sound nice with a roar to it but the advantage is of course that you can keep it quiet when driving and after 4k rpm it will bring the engine to life a bit
thanks for all the advice on this
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