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I'd always wondered what was inside the twin outlet pipe RSR exhaust box, now I know......... absolutely **** all!
That's all about to change, soon to be a switchable system, straight through, and then the centre section filled with all sorts of pipes,
flaps, levers and lagging, just to keep the boys with the decibel meters happy.
Also make it a bit more easy on the ear on the long motorway runs of course!
cheers, Mike.
previously..
1994 968 Club Sport Riviera Blue
1994 993 C2 Carrera Riviera Blue
1972 911S to Martini RSR Prototype Spec
1973 911E to RS Lightweight Specification
1981 924 Carrera GT ex Mexborough car
3.2 Carrera Sport x2
ddk member# 1527
Austin Healey 100/6, 1957 Fast Road ( now sold)
75 2.7 S backdated to "r" and very light (now sold).
Adria Camper
Buddy McCrae kneeboard.
Friar Tuck kneeboard.
Lots of Bicycles.
haasad wrote:What manufacturer was that box Mike ?
andy
Andy, it's the Dansk RSR box.
cheers, Mike.
previously..
1994 968 Club Sport Riviera Blue
1994 993 C2 Carrera Riviera Blue
1972 911S to Martini RSR Prototype Spec
1973 911E to RS Lightweight Specification
1981 924 Carrera GT ex Mexborough car
3.2 Carrera Sport x2
I fancy it might be an on the fly silent choice option for a stealthy approach
andy
ddk member# 1527
Austin Healey 100/6, 1957 Fast Road ( now sold)
75 2.7 S backdated to "r" and very light (now sold).
Adria Camper
Buddy McCrae kneeboard.
Friar Tuck kneeboard.
Lots of Bicycles.
Now 'they' sell those flaps with a solenoid like the ones a late 911 and boxsters all have although the late cars work alittle differently it does the same job.
So perhaps a pair of flaps on the button which when shut send the gases around the exhaust box rather than straight out.
am I warm yet...
Neil's plan is to have flaps in the megaphone pipes that join the box to the headers with bypass pipes that route through the box and cross over.
The box is baffled and full of sound deadening material. The flaps will operate by cable which runs through to either the heater lever between the
seats or to the heater slider on the dash. You end up with a quiet system at the pull of a lever, specifically for the man with the decibel meter at
the track but then also to keep the neighbours happy on those early morning start ups and to stop the headaches on the long runs.
The downside is the cost, the expert exhaust fabricator who will build it is confident he can get it down to 100db but it will take a lot of time to
get right, and as always that's money!
cheers, Mike.
previously..
1994 968 Club Sport Riviera Blue
1994 993 C2 Carrera Riviera Blue
1972 911S to Martini RSR Prototype Spec
1973 911E to RS Lightweight Specification
1981 924 Carrera GT ex Mexborough car
3.2 Carrera Sport x2
To package a re-routing into a silencer in the middle section but then return it to the original tailpipes would be very hard to package inside the original case. The turns to get the exhaust gas into the middle section and the 90 degree turn back into the original tailpipe would be very tight.
So.....
I'd suggest having butterfly flaps in each of the tailpipes (cable linked) and drilling more holes in the section inside the silencer. Then build a set of baffles that end up exiting the gas out of two new tailpipes (either in the centre or better yet next the originals). So from the rear it would look like a wild 4 outlet race exhaust but actually only the inner "quiet" pair would be working in stealth mode and if the butterflies were opened the straight-through flow would resume (with a very slight reduction in noise because of the extra drillings).
) .
