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!

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.

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.

Y8s, isn't that a resonator, not a glasspack?

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 shit.

I looked inside the cherrybombs at pepboys, they dident have louvers, it was just straight through with holes (not louvers).

Well its eaither cherry bomb or straight downpipe..

How about two running down the sides like an old school hot rod?

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.

Yeah...which means it wont restrict flow or get the raspy ass 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.

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! :ugh2:

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.

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

Attachment 213571
Attachment 213572

Looks great.

the walker/dynomax I linked to at summit uses fiberglass...

looks like crushbent garbage to me.

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.

A crush bent 3" will still only flow like a ~2.5".

:werd:

mandrell bends FTW

Im guessing because of the narrower area it creates to make the bend.

:jerkit:

as for 7% loss, who really cares for a 7% loss.....

i like it, it was cheap :)

I was running a 2.5" cherrybomb glasspack. Exactly the setup you are talking about, with the turndown before the diff. Loud, but sounded good. Not REALLY LOUD, just loud. I'm going back to a more conventional exhaust, and 3" now.

I had a cherry bomb on my N/A 90 miata. It started out okay then becaming deafening...had to buy an ansa slip on for the time being. It was a 2.5'' i think.

I picked up a 3.5" moroso spiral flow for 35 shipped from summit.com a year or two ago. Exhaust was routed through the moroso then out a cutout valve. It sounded very loud in the car, even with the cutout 'turned down.' Outside of the car it sounds like any other four cylinder with an exhaust, nothing to aggressive or loud. Definitely not attracting the kind of attention you get with an open downpipe! I would have hated it w/out the valve to direct exhaust into a 2.5" dynomax thrush (20 dollars).

I can't comment on the cherry bomb, but 27 dollars for a 3" ID FTW!

The problem I had with my old setup was the drone. The actual exhaust was actually pretty awsome. That drone would make my brain vibrate, drove me CRAZY.

DIY 3" exhaust with a straight through magnaflow and a downturn...track car only.

Would not do it on a daily driver...the sound inside the car would be annoying for daily driving. Outside of vehicle is not bad at all.

Take a look at these chambered mufflers http://www.classicchambered.com/classic/faq.html , http://www.torquetechexh.com/mufflers.htm . They cost a little more, but are way more efficient and don't make as much vibration/drone as a CherryBomb. In highschool I had two of these on an 87' IROC. I put them inline behind the cat and removed the (HEAVY & INEFFICIENT) single in dual out muffler. This alone droped my ET by .11 at the strip. The sideffect was everybody thought it was actually a V-6 because of the single exhaust.... until they heard it runnin.

When i do my exhaust in the coming weeks I am thinking of running a 2.5" downpipe expanding out to a 3" high-flow cat (which I already have), a 3" dynomax bullet, followed immediately by a supertrapp disc muffler terminating just ahead of the diff. Lets see how that works out.