exhaust sound

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Re: exhaust sound

Postby RBP » Fri Dec 07, 2018 2:22 pm

What body are you using. I've never seen one that looks like that,or those tail lights.
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Re: exhaust sound

Postby Kris Courtney » Sat Dec 08, 2018 8:59 pm

It’s a 2014 vintage I got some beehives from Greg and French them in. Less crome better in Hawai’i . Still a bigger butt than the originals.
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Re: exhaust sound

Postby Kris Courtney » Sat Dec 08, 2018 10:33 pm

Always liked this look
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Re: exhaust sound

Postby Kris Courtney » Sun Dec 09, 2018 2:00 pm

You can see how tight the turns are for the rear exhaust bends.
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Re: exhaust sound

Postby Kris Courtney » Mon Dec 10, 2018 1:37 pm

Gonna make a RS -60 mark Silancer muffler kit.It is kinda loud.
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Re: exhaust sound

Postby RS-60 mark » Tue Dec 11, 2018 11:47 am

Kris Courtney wrote: It is kinda loud.


As in: Kinda racy, huh? :nana:
As in: The car kinda sounds like it looks? :nana: :nana:
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Re: exhaust sound

Postby Kris Courtney » Wed Dec 12, 2018 6:49 pm

RS-60 mark wrote:
Kris Courtney wrote: It is kinda loud.


As in: Kinda racy, huh? :nana:
As in: The car kinda sounds like it looks? :nana: :nana:



I haven't taken out the resonator yet.
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Re: exhaust sound

Postby DannyP » Fri Dec 14, 2018 8:53 am

Rudy, the beehives were frenched in on the 550A Spyder, of which 30-odd cars were made. Grilles were farther apart, and much further back, and had Dzus fastners on one end and a hinge on the other. Also they had the big carb doors, the clamshell was a lift-off affair. Body was lighter gauge aluminum, many more attachment points due to small-tube chassis, almost like a birdcage Maserati.

The car was lighter and WAY more torsionally rigid. 1100 pounds ready to race. Handling was better since the chassis was stiffer. The car was pretty fast since it went on a diet. IMHO the best look/performance of all the Spyders. No more oval cockpit bulkhead under your legs anymore though.
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Re: exhaust sound

Postby DannyP » Fri Dec 14, 2018 9:00 am

I measured 107 dB A-weighted under full acceleration(in the cockpit) with the old soft top on. 94 dB cruising. A lot of that noise is from the intake.

I purchased the blow-through turbo hats for the carbs from CB Performance, plus a couple small cone filters. This dropped the noise to 97 dB under full accel, and under 90 dB at cruise. I still run active noise-reduction earbuds when I drive with the top up. Without the top, the noise is much less, much more palatable.

Those carb throats behind your head and echoing through the carb "doors" are REALLY loud.
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Re: exhaust sound

Postby Ralphc » Fri Dec 14, 2018 10:35 am

Not only was 550A chassis stiffer, it was no longer pure swing axle. Axles were double jointed, and pivot was lowered.
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Re: exhaust sound

Postby RBP » Fri Dec 14, 2018 2:53 pm

Thanks D, was wondering about that. If the last picture on page 4 is the rear end of a Vintage it must have been modified a fair bit. Looks kind of funny, very flat in the area where the little tail lights go. On another note, ooks like a lost my brake lights again! This is the 2nd module, maybe I need a fuse or something.
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Re: exhaust sound

Postby DannyP » Sat Dec 15, 2018 6:18 am

Lose the adapter. I did mine with a bunch of Bosch-style relays, mounted to a steel strap in a row(the kind that used to come with aftermarket car radios). I used a couple diodes to allow my single turn dash indicator to function as well. And a single 2-prong LED flasher is installed now(motorcycle type). The original install used a regular flasher, but the new car has all LED lighting so swapped that out. The brake lights work off the relays as well. It's a little complicated but it works flawlessly, I've had it in there for 10 years now after three modules died.

Instead of two DPDT relays, I used 4 SPDT standard Bosch type. If you have a separate L and R indicator light, just splice it in with the FRONT turn signal. You won't need that relay on the bottom of the diagram. I also added a couple more relays and gave myself 4-way emergency flashers.
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Re: exhaust sound

Postby DannyP » Sat Dec 15, 2018 6:29 am

Ralph, you are quite correct, it was a low-pivot rear suspension, which still had an amount of jacking, but much reduced from the high-pivot swingaxle.

I agree Rudy, the original 550a had a more tapered look to the fender. The replicas are all flat there to allow mounting of the standard Spyder taillights.

Here's a picture of what I did:
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Re: exhaust sound

Postby RVosari » Sat Dec 15, 2018 8:55 am

If you have a Beck style 4-1 exhaust system you can incorporate a Helmholtz chamber with judicious cutting and fab work on the original pipes using an inert gas welder.

The chamber will emphasize lower exhaust tones and create an idle sound typical of camshafts with significant overlap…

The Vibrant Performance resonator from Taiwan weighs just 5.5 lbs. and is made of Stainless. You can insert a baffle and glass-pack liner in a section of the old tailpipe and tune the sound to your final liking. :)

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Re: exhaust sound

Postby RBP » Sun Dec 16, 2018 7:57 pm

Thanks D, Looks like a big rewiring job. I''ll look at that, might have some qestions so wil message you later. Thanks for the input, I guess those trailer modules are very delicate.
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