New muffler

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brackie1
Posts: 502
Joined: Sat Dec 14, 2013 1:24 pm
Your car is a: 1978 124 spider
Location: Winston-Salem, NC

New muffler

Postby brackie1 » Wed Apr 12, 2017 3:21 pm

As mark recommended I have installed a flowmaster hp-2. I was surprised at the sound. I was expecting a somewhat high pitched sounded, but instead it produces a somewhat deep throaty sound. You can feel a slight vibration in the seat as you drive. It does produce a slight drone but not objectionable. It may be my imagination but it seems as though the old spider has a little bit more pep. I like it. It is not as wide so brackets will have to be made.
Gene
North Carolina

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michaelj
Posts: 78
Joined: Sun Dec 29, 2013 9:25 am
Your car is a: 1976 Spyder
Location: Mount Dora, Florida

Re: New muffler

Postby michaelj » Wed May 03, 2017 7:02 am

Gene, were you going from the stock set up to the flowmaster? I modified my engine quite a bit and have been running it for about a year now. Runs great, but i get the feeliing it could do more. The other day i swung it into a local shop and had him put it on a lift to find a bumping noise. Turned out to be the idler arm was worn out. But while it was up there i started to eyeball the exhaust. The guy said it looked like inch and a quarter pipe. Seems small, but these are small engines I guess. Then he noted that coming out of the center muffler going to the rear muffler, that pipe was 1". It has to be a chokepoint.

That being said, I was wondering why you change the muffler, was your engine modified at all, and did you feel a difference in performance. I have higher compression ratio, bigger valves, hotter cams, lightened flywheel (best money spend right there!), electronic ignition. She runs great and i am thinking of dual carbs. BUt a 1" pipe sounds restrictive.

Mike

brackie1
Posts: 502
Joined: Sat Dec 14, 2013 1:24 pm
Your car is a: 1978 124 spider
Location: Winston-Salem, NC

Re: New muffler

Postby brackie1 » Wed Jun 21, 2017 10:54 am

Sorry for the delay in responding to you mike. I changed mine to get a less restricted flow thru the exhaust system. I honestly think it runs better certainly sounds better. My mechanic had to do some modification to the exhaust pipe going into the new muffler due to big difference in size, but wasn't that hard.
Gene
North Carolina

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chrisg
Posts: 606
Joined: Sun Jun 04, 2006 7:30 am
Your car is a: 1971 FIAT
Contact:

Re: New muffler

Postby chrisg » Wed Jun 21, 2017 11:10 am

so, you are talking about that muffler at the end of a stock system?
Chris Granju
Knoxville, TN
'71 FIAT 124BS (stock, pretty), '72 FIAT 124BC,'76 FIAT 128 Wagon (rat rod), '85 Bertone X 1/9 (FI, efficiency machine) '70 124BC (project,project), 79 X1/9 (hot rod in rehab), '73 124BS (2L, mean), '74 124 Special TC

brackie1
Posts: 502
Joined: Sat Dec 14, 2013 1:24 pm
Your car is a: 1978 124 spider
Location: Winston-Salem, NC

Re: New muffler

Postby brackie1 » Wed Jun 21, 2017 9:15 pm

Yes
Gene
North Carolina

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chrisg
Posts: 606
Joined: Sun Jun 04, 2006 7:30 am
Your car is a: 1971 FIAT
Contact:

Re: New muffler

Postby chrisg » Thu Jun 22, 2017 11:51 am

Many years ago, I used a 2" dynomax at the end of a 2" system I put together myself (at the end of a 4-1 header) and it flowed nicely & though loud it was an appropriate Italian sports car exhaust note. That particular setup was high RPM -friendly. Putting a nicer muffler after the more-or-less stock system I would think would have little actual VE benefit, though I'm sure sounds better.
Chris Granju
Knoxville, TN
'71 FIAT 124BS (stock, pretty), '72 FIAT 124BC,'76 FIAT 128 Wagon (rat rod), '85 Bertone X 1/9 (FI, efficiency machine) '70 124BC (project,project), 79 X1/9 (hot rod in rehab), '73 124BS (2L, mean), '74 124 Special TC

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phaetn
Posts: 500
Joined: Thu Jan 02, 2014 7:42 pm
Your car is a: 1974 Fiat Spider 1800
Location: Ottawa, ON Canada

Re: New muffler

Postby phaetn » Wed Jul 05, 2017 9:26 am

chrisg wrote:Putting a nicer muffler after the more-or-less stock system I would think would have little actual VE benefit, though I'm sure sounds better.

As an epistemology teacher I can't help but pointing out that perception = reality. If it sounds louder, and that's something you like (i.e. it's better) then, ipso facto, the car is faster.

Same thing with a new paint job. Forget drag co-coefficients, if it's a colour that turns your crank then it just goes more quickly. ;)

Cheers,
phaetn
1974 CS1 Spider
32/36 DFV carb
Allison's CompuTronix electronic igntion
Vick's stainless header; no cat
A/R's progressive coils, Koni Yellow dampers
205/50-15 Dunlops on CD-66 style wheels
Momo steering wheel, Corbeau seats and harness
pics and HD vids

brackie1
Posts: 502
Joined: Sat Dec 14, 2013 1:24 pm
Your car is a: 1978 124 spider
Location: Winston-Salem, NC

Re: New muffler

Postby brackie1 » Wed Jul 05, 2017 9:53 am

So true. A recently washed car also drives better.
Gene
North Carolina

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chrisg
Posts: 606
Joined: Sun Jun 04, 2006 7:30 am
Your car is a: 1971 FIAT
Contact:

Re: New muffler

Postby chrisg » Wed Jul 05, 2017 3:01 pm

You are correct. I have a wonderful was-NOS Abarth downpipe back system on my '71 (which you likely inadvertently heard at FFO last summer) that I'm most certain does not flow any better than an uncompromised stock system but sounds so nice.
Chris Granju
Knoxville, TN
'71 FIAT 124BS (stock, pretty), '72 FIAT 124BC,'76 FIAT 128 Wagon (rat rod), '85 Bertone X 1/9 (FI, efficiency machine) '70 124BC (project,project), 79 X1/9 (hot rod in rehab), '73 124BS (2L, mean), '74 124 Special TC


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