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Flowmaster

D

DaleB

Guest
Well, an older than dirt fella like me had to go out and get some "Flowmasters" (40 series) for the 94. They are LOUD.

Sounds good at idle and from 2000 on up but between 1000 to 2000, it just plain hurts the ear drum and is not pleasant at all.

The Flowmaster folks said a "balance tube" needed to be added. Local muffler shop says no place to put a balance or crossover.

Any suggestions? Maybe I need to go get some different mufflers and write off the $300 as bad behavior.:D

If I weren't so old, I'd plan more, but I want to enjoy this fun machine for a little while. :) I gotta go cause I was born (too many years ago) to be wild. :J

Cheers Ya'll

Dale
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,237
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
DaleB said:
The Flowmaster folks said a "balance tube" needed to be added. Local muffler shop says no place to put a balance or crossover.

:eyerole You gotta be kidding me Dale, look at any of the Corvette exhaust manufacturers and you'll find Y-pipes with the rear crossover. ;)

_ken :w
 
D

DaleB

Guest
Thanks for the infor Ken

I didn't even think of a rear site. The Flowmaster book says "***the "H" pipe should be installed as close as possible to the header collector. With manifolds , the "H" pipe should be placed just were the downpipes become horizontal."

At my age, by the time I get under the green machine, it's time to get back up and go to bed. Maybe that's why I need the early morning to rise and shine and go for my morning drive.

Thanks Again

Dale

:Roll
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,237
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
It's possible to make a crossover I suppose, that is physically closer to the collectors, or as the case may be, the front Y-pipe. But the resonance you are experiencing from the Flowmasters, is supposed to be reduced dramatically by using the rear Y-pipe with a crossover. ;)

_ken :w
 

Topless

Well-known member
Joined
Nov 12, 2001
Messages
444
Location
San Diego, CA
Corvette
1992 Convt w/hard top; 2004 Z06 Z16; 1962 327/300
Dale, I don't think you have a Y collector on your 94. There is room for a crossover (H or X). I was just at an exhaust shop last week, and they told me $100 to put in a 3" X in my '92 to replace the baffle box. I really don't have much room with 3" and frame stiffeners, but it can be done.
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
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CenCoast CA
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The Flowmaster 40-series is a lousy choice for a Corvette. Best for performance and noise is their 50-series Delta Flow units.

Even better would be the four-chamber 70-series but getting them to fit would be a real challenge
 
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DaleB

Guest
Hib got it right. Should be posted for anyone who plans on replacing their mufflers. I had a rear "balance" pipe put on this morning. Didn't make any change. Too bad. It still sounds good at idle and wild and not uncomfortable over 2000 rpm. It is just that easy push from 1000 to 2000 that drives me crazy.

Maybe I should think positive and just not let it fall below 2000. Might make for some interesting take-offs.

I do wish I had found this information sooner. Maybe an idea for another place on the Center for folks planning on buying aftermarket products.

Cheers

:D :s

Dale
 

Ken

Gone but not forgotten
Joined
Jan 30, 2001
Messages
8,237
Location
Hermosa Beach, CA
Corvette
1987 Z51 Silver Coupe
DaleB said:
...just not let it fall below 2000. Might make for some interesting take-offs..
:L Yeah Dale, it just might! :L
DaleB said:
...I do wish I had found this information sooner. Maybe an idea for another place on the Center for folks planning on buying aftermarket products.
That's why you're supposed to post here first, to ask for advice. ;)

_ken :w
 

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