K19
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| posted on 2/7/17 at 10:56 PM |
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Silencer Pipe Diameter
I've got a 1.8 mk1 mx5, so its 2 1/2 inch exhaust pipe. I'm not sure what diameter silencer pipe to put onto it.
Currently its got a 5 inch bike exhaust on it (its a mess)
Just need it to pass IVA sound reqs really. any recommendations?
I have no idea what I'm doing.
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Jenko
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| posted on 3/7/17 at 09:48 AM |
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I'm guessing around 6 inch dia (with 2 inch tube), around 24inches long, should see you through IVA....That said, there are a number of other
factors that come into play...i.e. induction noise, location of exhaust in relation to engine, engine top rpm, etc.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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Mr Whippy
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| posted on 3/7/17 at 12:09 PM |
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you do get quiet bike silencers and I used them both on my buggy and the JBA Falcon, I actually bought them to be very loud but they were anything but
and far quieter than the car ones I had on. They were also super light (carbon shell) and far less stress on the exhaust system.
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907
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| posted on 3/7/17 at 03:26 PM |
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I now have a 146bhp MX5 1.8 and the standard exhaust is 2". Only the last 200mm tail pipe is 2.5".
If you have a 2.5" then its an after market one.
I have fitted a 2.5 sports silencer on mine but even with that it's only 93dBa. (see pic)
However, there are two major differences between a seven type car and the original MX5.
One is that the cat acts as a sound restriction and lowers the reading, and two, seven systems are short and the longer
the system the quieter it will be.
A 2" system will easily handle anything below 200 bhp.
Paul G
 
New back box
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K19
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| posted on 3/7/17 at 09:32 PM |
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Thanks for the advice everyone. After a bit more of a look the exhaust manifold looks like a bit of a mess, somewhere between 2.25 and 2.5 inch
diameter. Looks like its going to be a bit of a jiggle to get something sorted.
Its all going to get changed when it gets turbo'd anyway!
I have no idea what I'm doing.
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