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RX-7 2nd Gen Specific (1986-92) RX-7 1986-92 Discussion including performance modifications and technical support sections. |
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#1 |
RCC Loves Me Not You
Join Date: Jul 2008
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Another Exhaust Thread :)
So I'm doing research on exhausts (I need to alter/change mine) and came across this. Might prove worthwhile to those thinking about changing their own.
Consequently I'm looking at changing my exhaust by removing the y-pipe (my exhaust is not stock) and inserting a single inlet dual outlet chambered muffler to two large offset inlet outlet circular mufflers in the stock location. This should prove interesting ![]() http://www.pontiacstreetperformance....p/exhaust.html http://www.pontiacstreetperformance..../exhaust2.html Although those deal with piston engined cars, their information is still nice to have. Furthermore anyone who has experience with exhausts please feel free to post.
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
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#2 |
RCC Addict
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Chambered mufflers are a waste of time if you're looking for performance.
-Ted |
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#3 | |
RCC Loves Me Not You
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Quote:
I still aim to have around 400HP with my setup, but I would like it to be as quiet if not quieter than stock (I know I'm asking for the impossible)
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
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#4 |
Big Ugly
Join Date: Apr 2009
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Would like to see the results when youre done & your impressions on how it sounds.
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Boosted Big Body On 335's PS3 ID: Rotordad 1986 Mazda RX7 GXL - Street ported 13BT, Haltech, 62mm, ect. 2006 MazdaSpeed 6 - Eagle, Wiseco, Cobb, ect. |
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#5 |
Rotary Fanatic
Join Date: Feb 2008
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rotary + flowmaster = WAT
im also curious about sound lol.
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#6 |
RCC Loves Me Not You
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Who said anything about Flowmaster?
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
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#7 | |
RCC Addict
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Ever seen a Ferrari exhaust? It's basically one big muffler from engine to tailpipe! Chambered mufflers choke off too much performance - you'd need to build a 600hp engine to get 400hp after choking it off with all the chambered mufflers. You want quiet? Just don't rev over 2,000RPM. You thinking you can rev up to redline past law enforcement? I doubt stock is going to prevent you from getting looks. You own a PERFORMANCE vehicle. It's sad that you're putting noise supression a priority over performance... ![]() -Ted |
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#8 |
KTEC
Join Date: Jan 2009
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I did a lot of research a while back on mufflers. Then "tested" a few out. This is the ONLY muffler I will use from now on...
Where to buy it... http://www.jegs.com/i/Hushpower/526/13516101/10002/-1 Info... http://www.hushpower.com/technology.php Here's how it looks on the car... ![]() ![]() Your welcome.
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what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2 |
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#9 |
RCC Addict
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I have my doubts on anything Flowmaster makes...
I don't like that Hushpower muffler because we've messed with perforated cone disrupters before...they don't work. I still believe a perforated offset pipe muffler will outflow almost any other muffler out there while giving you the best noise supression versus performance, period. Anything baffled impedes flow - common sense. The Hushpower muffler articles go into a lot of bullsh*t marketing words but where's the chart with the numbers? -Ted |
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#10 |
Can't.Make.Up.My.Mind.
Join Date: May 2009
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just make it loud
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'90 GTUs Stay up to date with my photography '06 Toyota Highlander Hybrid '10 Toyota Prius "Initial Success or Total Failure" |
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#11 | |||||
RCC Loves Me Not You
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Quote:
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Ted, it appears I'm getting conflicting information between you and NoDOHC. This is what he has to say in a similar thread: Quote:
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#12 | |
RCC Loves Me Not You
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The Official FC Radiator Thread My Project Thread: Cerberus CCVT Virginia Rotary Group |
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#13 |
KTEC
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I do have a smart phone. But don't have a DB reader on it. Even if i did, i dropped it enough to where the speaker barely works on it. So i wouldn't trust the sound recorder on it.
I will say this. I had a 2.5" exhaust with a resonater right after the down pipe and a 2.5" muffler. I then built this exhaust which is 3" the entire way with no resonator, and this muffler is 3" also. And this exhaust is far deeper and much quieter. No I don't have any hard numbers with charts to prove. But out of the 20 something mufflers I had on FC's. I would choose this one any day.
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what I have: 1985 Gs:12a All motor Drag car - 1973 Rx2: Play car What I had: 93 Touring: TRADED - 91 Coupe: TRADED - 90 GTU: RHD - 88 10AE: SOLD - 87 Base: SOLD - 86 Base: SOLD - 1985 GSLSE - 85 Gsl: SOLD - 80 Gs: TRADED - 1972 Rx2 |
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#14 | |
RCC Addict
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Quote:
I'll put money that a perforated tube muffler will outflow any chambered muffler when it comes to performance, period. Sure, the chambered muffler will minimize noise - that's it's primary design criteria. I'm arguing performance versus noise suppression. There's two ways to suppress noise from the exhaust - choke the crap out of it or "tune" by resonance. Resonance tuning is a lost art, and does exactly what NoDOHC mentions above. The problem is that you cannot tune the entire RPM band out - you can only quiet RPM ranges, which can sometimes be quite narrow. So unless you find an experienced exhaust guy that knows the car's set-up, it becomes an expensive proposition of experiementing with muffler positions to get what you want. I always say to just stuff the biggest, honkin' muffler you can affort and fit under the car to get the best suppression. -Ted |
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#15 | |
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Currently running: 90 GTUs converted to S5 TurboII. Track car. 90 N/A GTUs.. Running project car 89 N/A GTUs in Black #2 10/6/18 Blown coolant seal undergoing rebuild and restomod. |
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