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Old 04-09-2008, 11:32 PM   #1
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Default Anyone run a cherrybomb glasspack?

Im thinking of doing a downpipe to a cherry bomb and then dump it before the diff. Im intrested in how they sound, they look very non restrictive and cheap!
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Old 04-09-2008, 11:39 PM   #2
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Nope, but plan to. Well, they are glass packs. I plan to run as many feet of them as possible to the rear, then a muffler. FWIW, the sound deadening affects grow exponentially with glass packs. For example, compare a 2' and 3' glass pack, the 3' cuts out almost twice as much as the 2' one. For what your doing, try to get a 4' one with a turndown at the end. They used to make 4' glasspacks, but I haven't been able to find them. Still, I plan to squeeze 6-7 feet of them into my exhaust system.
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Old 04-09-2008, 11:45 PM   #3
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dont use the cherry bomb. it's louvered like a cheese grater inside. reduces flow significantly compared to a perforated core.

http://store.summitracing.com/partde...5&autoview=sku

maybe a few more bucks, but worth it.
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Old 04-09-2008, 11:54 PM   #4
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Y8s, isn't that a resonator, not a glasspack?
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Old 04-09-2008, 11:58 PM   #5
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me and compy both heard a cherrybomb on a 1.6 miata over the summer when i picked up my hardtop in philly. we both agreed that it sounded like ****.
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Old 04-10-2008, 12:00 AM   #6
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I looked inside the cherrybombs at pepboys, they dident have louvers, it was just straight through with holes (not louvers).
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Old 04-10-2008, 12:00 AM   #7
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Well its eaither cherry bomb or straight downpipe..
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Old 04-10-2008, 12:05 AM   #8
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How about two running down the sides like an old school hot rod?
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Old 04-10-2008, 12:07 AM   #9
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take a look at lightweightmiata.com. Member rmcelwee has some videos on that site as well as youtube. Sounds pretty ok for such a simple system, I think.
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Old 04-10-2008, 12:11 AM   #10
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Quote:
Originally Posted by patsmx5 View Post
Y8s, isn't that a resonator, not a glasspack?
Yeah...which means it wont restrict flow or get the raspy *** sound....so its better all the way around.

its a straight through muffler, if used in conjunction with another muffler, it then becomes a resonator.
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Old 04-10-2008, 12:18 AM   #11
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Quote:
Originally Posted by miatamania View Post
Yeah...which means it wont restrict flow or get the raspy *** sound....so its better all the way around.

its a straight through muffler, if used in conjunction with another muffler, it then becomes a resonator.
Well, they don't do much compared to a glasspack. I think it's 1/3 the sound reduction of a glasspack, and most will admit even glasspacks don't do that much. Granted it doesn't restrict flow as bad, but at the consequence of less sound reduction. Not better all the way around is the point. Each has its perks. Glasspacks wear out, resonators don't.
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Old 04-10-2008, 12:25 AM   #12
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what's the difference? it's a cylindrical muffler or a cylindrical muffler painted red. they are the same. perforated flow tube surrounded by fiberglass roving encased in another metal tube.

just make sure whatever you get isn't louvered.

yeah, robert did a dump-bomb just like you describe. dont expect it'll be quiet!
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Old 04-10-2008, 12:33 AM   #13
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Glasspacks use fiberglass as the sound absorbing media. Resonators use steel mesh, or steel wool. The steel doesn't absorb sound as well, but it last longer. They are not the same.
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Old 04-10-2008, 12:38 AM   #14
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heres what i did,

3" right after the first bend on the greddy dp
so only like 4 inch's of the greddy dp remain
so i dont touch the hoses and crap
i ran a straight line, no cat , to this http://cgi.ebay.com/ebaymotors/Magna...spagenameZWDVW

its very quiet, and sounds very nice when i romp on it
no rasp what so ever

heres how it looks

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Old 04-10-2008, 12:42 AM   #15
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Looks great.
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Old 04-10-2008, 11:15 AM   #16
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Quote:
Originally Posted by patsmx5 View Post
Glasspacks use fiberglass as the sound absorbing media. Resonators use steel mesh, or steel wool. The steel doesn't absorb sound as well, but it last longer. They are not the same.
the walker/dynomax I linked to at summit uses fiberglass...
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Old 04-10-2008, 11:20 AM   #17
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Quote:
Originally Posted by urgaynknowit View Post
heres what i did,

3" right after the first bend on the greddy dp
so only like 4 inch's of the greddy dp remain
so i dont touch the hoses and crap
i ran a straight line, no cat , to this http://cgi.ebay.com/ebaymotors/Magna...spagenameZWDVW

its very quiet, and sounds very nice when i romp on it
no rasp what so ever

heres how it looks


looks like crushbent garbage to me.
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Old 04-10-2008, 11:24 AM   #18
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Quote:
Originally Posted by hustler View Post
looks like crushbent garbage to me.
On a pipe that big it wont make a difference.
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Old 04-10-2008, 11:42 AM   #19
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Quote:
Originally Posted by Saml01 View Post
On a pipe that big it wont make a difference.
if anyone cares...

crushing a 3" pipe by just a half inch results in a 7.7% loss in flow area.
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Old 04-10-2008, 11:44 AM   #20
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Quote:
Originally Posted by Saml01 View Post
On a pipe that big it wont make a difference.
A crush bent 3" will still only flow like a ~2.5".
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