JayL

iTrader: (12)

Should I run an open dump tube or have it recirculated back into the exhaust? I haven't heard a miata with an open dump tube, but I think it would be much too loud for street use. Would adding a resonator of some sort help much? I have no fabrication or welding skills, so I will be taking it somewhere to have the work done. What should I do?

cjernigan

iTrader: (13)

I ran an open dump, it wasn't all that bad. Not bad enough that I cared. I do plan to recirc the WG with the new setup though just to keep things quiet.

patsmx5

iTrader: (16)

I plan to have the dump tube parallel the 3" exhaust to about the middle of the car, then dump back in. The further away from the turbo you dump it back in, the better. Here's the jist of it. The gases coming out of the turbo are hot and expanded. As they travel threw the exhaust, the cool down and slow down. Resistance in a pipe increases by the square of the velocity. Resistance in a pipe also decreases by 1/diameter^4. (has nothing to do with this discussion). Just tell whoever builds it to put the dump tube back into the 3" exhaust as late as far back as reasonably feasible.

airbrush1

FYI Vibrant makes a WG dump muffler/flame supressor

cjernigan

iTrader: (13)

I think a lawnmower muffler is close to the same size as well, probably cheaper than the vibrant piece.

bryantaylor

iTrader: (5)

i have a open dump on mine, i can't hear it open over the turbo and the straight open 3in exhuast, so it doesn't really matter IMO

cardriverx

iTrader: (12)

open dump sounds badass, keep it open.

airbrush1

yeah I run open dump on my car now, and it sounds awesome IMHO, guys from the NE dyno day could tell you if they agree or not I'm sure

paul

iTrader: (21)

i must have left before you ran. oh well

mrtonyg

iTrader: (1)

Open dump tube here...it's not bad at all.


Tony

rappadan

iTrader: (2)

it was awesome!!!!!


open dump FTMFW!!!!

The_Pipefather

iTrader: (5)

Use one of these:

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

I plan to if I run a dump pipe at all.

atxturbomiata

go with open sounds great. just is loud.

Zabac

iTrader: (39)

Open

JayL

iTrader: (12)

You guys make it so simple to decide. Guess I'm going open and I'll see if I like it. Going open how far back should I run it?

XxGoKoUxX

iTrader: (2)

try to keep it away from any fuel lines/combustable areas.... sometimes those things shoot flames out

cardriverx

iTrader: (12)

just our of the enigne bay is enough, a turn down at the end would be nice too.

kotomile

iTrader: (24)

Anyone have any good vids or sound clips of this on a Miata?

weir

iTrader: (1)

i prefer to recirc myself, it just keeps the car cleaner underneath... i don't like exhaust on anything except the car behind me. it is also a bit more stealth sound wise... i don't feel the need to draw unnecassary attention from others (police included).

Zabac

iTrader: (39)

If you do recirc, do as far back as you reasonably can, I recommend after cat.