: flowmaster resonance??
Sep 2nd, 00, 07:04 PM
I just got my 396 running a few weeks ago. When I initially got the engine running, I used cherry bombs bolted up right behind the headers. This gave a loud but resonance-free
sound. Last week I had 3 chamber flowmasters
installed with exhaust dumping right ovet the axels. Now the car sounds great but has
a "car shaking" vibration at certain engine
speeds. Is this normal for the flowmasters?
I am not sure if I can live with it.....
Sep 2nd, 00, 07:35 PM
Yep, that's the consenus on Flowmasters. Do a search on the subject, it's been discussed at length. I personally had a set of 2 chambers flows on a small block and went through the same thing, at around 2200-2500 RPM, it was quite annoying........KZ
Sep 3rd, 00, 07:20 PM
My Camaro SS396 has Flowmasters and I love them. They are the Delta Flow 50 Series. There is no resonance to speak of. They give my car a deep, mean sound. The add in Jeggs says that the Delta Flow series reduces exterior sound and interior resonance. My car is as loud as my dad's Nova that has 2 chamber Flowmasters but has none of the annoying "Flowmaster resonance". I recommend them highly.
My car: http://albums.photopoint.com/j/AlbumIndex?u=424666&a=3131121
Sep 3rd, 00, 08:28 PM
DYNOMAX, I have had Flowmasters in the past, however the novelty has worn off. They do sound nice, but I would not want to live with them anymore. I recently acquired a couple of B-bodies that had Flowmasters, they will be coming off as soon as they become regularly driven.
Sep 4th, 00, 05:27 PM
I have a flowmaster full system behind hooker comps in my '68 ragtop 327. Mufflers are delta's, w/full tailpipes. While I've read a lot here about flowmaster resonance, my car has none of that!! Not sue if it's the delta mufflers, or maybe the h-pipe kills the resonance, but the car sounds sweet, in spite of the fact that my definition of sweet is a little different at 42 than it was 20 years ago.
Sep 5th, 00, 10:42 AM
The Delta Flow series was designed to eliminate the resonance problem. So if you don't want the resonance, go with the Delta series. Also, in speaking to a Flowmaster tech person, an "H" pipe will help with the resonance issue as well.
Hugger Orange & white 69 Camaro with supercharged 350, Tremec TKO, and 3.73 12-bolt
See my website updated 9/01/00 at:
Mark W. Winning
Sep 6th, 00, 05:05 AM
I run a set of dual 3" 2 chamber Flowmasters and I can very well relate to the vibration problem. To make matters worse, I use 3" turndowns right after the mufflers. I can atest to the fact that adding an H-pipe did remove a bit (read not all) of the res and vibration.
1992 Firebird 355/Six Speed
1991 RS 350 / 700-R4
1987 Toyota Pickup 383 / 500 + HP 10.963 @ 119.95
**How fast is just a matter of how much $$$ **
"They only thing worse than drinking out of the toilet is driving a FORD."
"FORD, the other F-word"
Sep 12th, 00, 03:36 AM
My Dad has a '69 small block car with the Flowmaster ful exhaust kit. Delta-flows and tail pipes. It has a horrible droan/resonance 2200-2500 RPM. ASt first, I thought it was a driveline vibration! It doesn't seem to bother him, but if it was my car, I'd pull the Flowmasters off!