quiet 3"?

[boosted_baron]

i have a 3" from the turbo back with a fake cat and a dynomax straight through.. its not that bad, rumbly, but who doesnt love that?

[amelnikov]

I had a mutsu on a 2.2 with a full 3" turbo back with catco cat, 2 dynomax bullet mufflers and a large round dynomax in stock location. It was very quiet but still sounded very good and as far as boost issued, I had none, ran it with g-valve set at 16 psi with no spikes.

Alex...

[kermit]

Quote:

Originally Posted by 88shadowpjct i still have the stock little mitsu turbo but i want some sweet flow

Which one do you want, lol??

[The Pope]

Quote:

Originally Posted by extreemduster With the muffler as far back as they are on our cars the stepped down 2 1/2" muffler will have little effect as far as flow is concerned. By the time the exhaust gets back there it has substantially cooled down. However the drop in decibels from a 3" muffler to a 2 1/2" is substantial. I have a pretty stout 340 duster that had full 3" exhaust into 3" 3 chamber flow masters. The car was unbelievably loud even with the full exhaust. It was rather bad on long trips down the interstate. I moved the mufflers farther back and used 2 1/2" step downs into Dynomax super turbo mufflers. The cheapest performance muffler with packing. The car is about half as loud as it used to be and still runs the same time at the drag strip low 7.80's in the 1/8th. Matter of fact the 60 foot times picked up ever so slightly. With the stock turbo I am not sure about, but I would not use the resonators where the cat used to be. Just use a 2 1/2" muffler that has packing out back. The car will be not much louder then stock at normal speeds.

Your 340 requires a 2.5" dual exhaust to ballence the exhaust at the exhaust port of the head so more can come out of the engine. Flowmasters create back pressure for this reason. The Dynomax mufflers are a zero back pressure muffler and a Flowmaster can create up to 4 PSI. So yeah I bet the car does run the same lol. In truth the 340 done with bullet mufflers and dual 3" exhaust should be slower unless it is really built.

Turbos are COMPLETELY DIFFERENT. Idiots at muffler shops are always trying to convince me my 4 cylinder is faster with a 2.5" than my 3". Apperently because of what happens with NAs like muscle cars that they are all equal. There is a couple PSI at the exhaust port of a well tuned V8. There is in many cases over 70 PSI of exhaust pressure at the exhaust port of a turbo street car at boost, so bigger the better.

3" exhaust done right allows a street turbo engine to run a bigger turbo than normal with the same spool up. If you have a real 3" system there is never a reason to run a tiny turbo like the mitsu. A 3" system done right and a Garret will have less lag. Noise? Small turbos and exhaust have that high pitch rap to them. 3" done right is quieter. .63 housing, 3" SV and system, and a Dynomax 3" super turbo has a low quiet big block sound to it. Me and GLHNSLHT2 like it short, loud and out the side

[87dtna]

Quote:

Originally Posted by GLHNSLHT2 any flow gains on the Mitsu will pretty much result in uncontrollable boost. Stick with stock until you upgrade to a garrett at least. Then put a full 3" on it.

This is wrong. The 2.2's with a mitsu are FAR more controllable than 2.5's with a mitsu. And since he has an 88, thats a 2.2.
In my 88' shadow with the original T1 engine, I kept the stock downpipe and went 3'' all the way out. NO cat, I tried full 3'' straight pipe first and yes I did get some boost creep. Set the MBC to 13 PSI and it would be at 17 by the time I shifted. BUT, I put on a 3'' dynomax ultraflow muffler (read-straight through muffler, barely any backpressure) at the very end of the car and the boost stayed like a rock anywhere I set it. Thats all it took to get my boost to not creep, a straight through muffler!
In my old daytona I had a full 2.5'' system with a 2.2/mitsu, no cat and bullet muffler, NO creep whatsoever.

[NoDestiny]

My 2.5" system on my 2.5/mitsu did cause creep enough to go into overboost. But do note, I put the 4.7v diode on there and with my wideband, I watched absolute peaks of no more than 16psi hit no more than 11.6:1 in a couple runs. But at the same time, every setup is different and if done, I recommend you monitor your air/fuel.