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Old 12-15-2006   #11
Aurora40
 
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Default Re: Flowmasters

Quote:
Originally Posted by Hib Halverson
snip

The Flowmaster catback uses 2.5" pipe and stock is 2.75, however, the decrease in restriction with the Flowmaster cat-back makes using it a net gain.

The Flowmaster resonator, is single in and two out. We modified it to accept a larger inlet.
Right, I mean an unmodified single inlet. I assumed it was bigger than 2.5". Is that the size where the single inlet hits the resonator?
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Old 12-15-2006   #12
Hib Halverson
 
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Default Re: Flowmasters

Darn!
16hp is pretty impressive from just an exhaust.

Were the two pulls made on the same day. If not, is this data SAE-corrected or standard-corrected?
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Old 12-16-2006   #13
Aurora40
 
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Default Re: Flowmasters

Quote:
Originally Posted by Hib Halverson
Darn!
16hp is pretty impressive from just an exhaust.
I believe that's 26hp.
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Old 12-16-2006   #14
blackjack
 
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Default Re: Flowmasters

i originally installed a borla cat-back system,2 1/2"...then i heard about the restrictions inside the pipes,apparently there to cut down on interior resonnance...so i decided to make my owm,with help from some friends..we installed 2 1/2" pipes from the cats,removed the resonator and put an x pipe in its place,and installed back the borla mufflers...we did not dynoed the car before or after,but the gain in power was really noticeable...the sound is deep and mellow,and i didnt notice any resonnance inside,at any rpm
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Old 12-16-2006   #15
Hib Halverson
 
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Default Re: Flowmasters

Quote:
Originally Posted by Aurora40
I believe that's 26hp.
My bad on that. Can't add late at night.

I was wondering if those two dyno pulls were done on the same day? If not, can you say if the data is either SAE-corrected or standard-corrected?
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Old 12-16-2006   #16
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Default Re: Flowmasters

It's not my dyno run, though the labels for the Y-axis' both say "SAE corrected" on them.
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Old 12-16-2006   #17
Hib Halverson
 
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Default Re: Flowmasters

Quote:
Originally Posted by Aurora40
It's not my dyno run, though the labels for the Y-axis' both say "SAE corrected" on them.
26 hp at the wheels, SAE-corrected, from a stock engine after just an exhaust change is absolutely incredible.
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Old 12-18-2006   #18
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Default Re: Flowmasters

Sorry for the delay. I have my kids for Christmas and we're on the go.

Hib, the car was totally stock. It was dyno'd about a week apart. The values were SAE corrected. Stock dynos were done six times and they never varied more than 2 hp. The modified (exhaust only) dynos were done six times and it gained about 2.5 hp per pull. After six we quit. I drove it straight from the muffler shop to the dyno. The temp varied slightly but I don't remember which way (1st to 2nd). The water temps were fairly controlled but it climbed as the day went.

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Old 12-18-2006   #19
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Default Re: Flowmasters

if i can ask hib if he has given thought to that ultra flow-x . they say its an x pipe in a muffler . I always hear that an x pipe gives alot of resonance. I amnot that knowledgeable but i just got back from having 410s put in as well as ported inj and plenum as well as a tune on the car instead of just ordering a chip that got13 hpextra . Since I have a complete flowmaster system I am very interested if i could gget an extra 10-15 out of her .She is at 409.9 rwhp 373 tq now . But 425 out of a stk motor with the above mods would be would be a dream come true. please advise as to my best path. any advise is much apprieated
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Old 12-18-2006   #20
Hib Halverson
 
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Default Re: Flowmasters

Quote:
Originally Posted by jonszr1
if i can ask hib if he has given thought to that ultra flow-x . they say its an x pipe in a muffler . I always hear that an x pipe gives alot of resonance. I amnot that knowledgeable but i just got back from having 410s put in as well as ported inj and plenum as well as a tune on the car instead of just ordering a chip that got13 hpextra . Since I have a complete flowmaster system I am very interested if i could gget an extra 10-15 out of her .She is at 409.9 rwhp 373 tq now . But 425 out of a stk motor with the above mods would be would be a dream come true. please advise as to my best path. any advise is much apprieated
I want to make sure I understand the above because it's just as amazing as 26hp at the wheels from just an exhaust....are you saying your car, which currently has a stock exhaust, makes 409 at the wheels after porting the injector housings, porting the plenum and having a custom tune done?

If this is correct, may I ask what facility did the dynamometer tests and are the numbers SAE-corrected, standard-corrected or raw data?
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