Aerodynamics of the Z1
Aerodynamics of the Z1
I'm presently considering a few aerodynamic mods for underneath my M Coupe, and whilst I was doing a Google search, I came across some info on the Z1 where it describes that rear end of the underside of the Z1 has aerodynamic bits and pieces, including the exhaust silencer. Does anyone have any photos of these various bits and pieces that you could post? I'd like to get a few ideas of what has already been tried and tested.
Aerodynamics of the Z1
Hi Exdos, I suggest you start at Paul Drawmer's site at bmwz1.co.uk. You will find a section there on aerodynamics and in the modification section you will find some photos of the BTB exhaust which is a reasonable copy of the shape of the original.
Not sure whether anyone has any idea if it works. I tried a car without the aerodynamic silencer, it had Lorenz replacements. Couldn't tell any difference but then it really isn't a car with exactly stonking performance!
Good luck.
Not sure whether anyone has any idea if it works. I tried a car without the aerodynamic silencer, it had Lorenz replacements. Couldn't tell any difference but then it really isn't a car with exactly stonking performance!
Good luck.
Actually, I'm pretty disappointed with the shape of the BTB -- it doesn't have the same inverted wing shape that the original did. So, although it's still a spoiler, I can't see it being quite as good as the original.
Ciao,
Spokey
Spokey
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Eh???spokey wrote:Actually, I'm pretty disappointed with the shape of the BTB -- it doesn't have the same inverted wing shape that the original did. So, although it's still a spoiler, I can't see it being quite as good as the original.
Did the one you saw look like these pics?
http://www.bmwz1.co.uk/z1silencer.htm
If not it wasn't a BTB one.
edited to remove poor grammar.
Hi Paul,
I bought it direct from BTB, so I can only assume it actually was a genuine BTB exhaust!
However, if you look at the BTB exhaust (certainly the one I have!), it's basically an oval shape in profile, whereas the original steel exhaust I had on before was an actual inverted wing. So while this will act as a spoiler to a certain extent, it will not be nearly as good as a proper inverted wing.
I bought it direct from BTB, so I can only assume it actually was a genuine BTB exhaust!
However, if you look at the BTB exhaust (certainly the one I have!), it's basically an oval shape in profile, whereas the original steel exhaust I had on before was an actual inverted wing. So while this will act as a spoiler to a certain extent, it will not be nearly as good as a proper inverted wing.
Ciao,
Spokey
Spokey
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In the pic of my old silencer, it is the top that has been cut open. Whilst it isn't very clear, the top of it was convex - like the replacement BTB one.
If the one you took off was flat, or even concave on the top surface, it was a different shape from the one we modelled the BTB box on!
All depends on whether any aero lift (-ve) was being caused by Newton or Bernoulli effect!
still like the Z1
If the one you took off was flat, or even concave on the top surface, it was a different shape from the one we modelled the BTB box on!
All depends on whether any aero lift (-ve) was being caused by Newton or Bernoulli effect!
still like the Z1
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I think the aerodynamics of the Z1 were 'overkill' in some respects, since the old girl is just plain slow. However, in other respects the aero is fantastic; e.g. side winds, cockpit buffeting, noise. In these areas, the Z1 has super performance. Mind you the sides, including the door glass, get really mucky sometimes. Proof that keeping it clean was not a consideration when designing the airflow!