Horse power increase with duels
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Joined: Jun 2005
Posts: 96
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From: Independence Mo.
Horse power increase with duels
I finished installing 2 1/2 duels with flow master mufflers on my 1979. Does any one have a opinion one how much hp the car picked up. I know it will need a tune up, but will the card need to be rejetted. It is a Q Jet. Thanks Gary B.
Race Director
Joined: Jan 2000
Posts: 12,399
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From: San Jose CA
With HEADERS, I switched from 2-1-2 2 1/4" exhaust to true dual 2 1/4" exhaust and my 0-60 time dropped from 6.6 to 6.4 seconds. Switching to dual 2 1/2" exhaust dropped the time again from 6.4 to 6.2. This is with dual cats on a 78 L-48 automatic (700R4 trans, 3.55 gears).
Switching heads and cam took me down to 5.6 seconds to sixty and a good stall converter would probably drop me to the low 5s.
-Steve
Switching heads and cam took me down to 5.6 seconds to sixty and a good stall converter would probably drop me to the low 5s.
-Steve
Le Mans Master
Joined: Oct 2000
Posts: 7,831
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From: Austin TX
Originally Posted by SpyderD
There was a detailed comparison post on this years ago. The increase from the fake duals to true duals was impressive - 40 horsepower? can't remember.
From Ganey:
http://www.corvettefaq.com/c3/ganeyexhaust.htm
Melting Slicks
Joined: Sep 2004
Posts: 2,412
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Duels? How is a gun fight going to give your Vette more hp? 
Going from one 2 1/2 pipe to dual 2 1/2 pipes will definitely open it up, but I'd be willing to bet that your major restriction was the 25 year old clogged poorly designed catalytic converter. Flowmasters aren't that great, my catalytic converters flow better than flowmasters. And long tube headers will help just as much as the pipes did.
Going from one 2 1/2 pipe to dual 2 1/2 pipes will definitely open it up, but I'd be willing to bet that your major restriction was the 25 year old clogged poorly designed catalytic converter. Flowmasters aren't that great, my catalytic converters flow better than flowmasters. And long tube headers will help just as much as the pipes did.
Race Director
Joined: Sep 2004
Posts: 11,874
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From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by torqvette
Duels? How is a gun fight going to give your Vette more hp?
Going from one 2 1/2 pipe to dual 2 1/2 pipes will definitely open it up, but I'd be willing to bet that your major restriction was the 25 year old clogged poorly designed catalytic converter. Flowmasters aren't that great, my catalytic converters flow better than flowmasters. And long tube headers will help just as much as the pipes did.
Going from one 2 1/2 pipe to dual 2 1/2 pipes will definitely open it up, but I'd be willing to bet that your major restriction was the 25 year old clogged poorly designed catalytic converter. Flowmasters aren't that great, my catalytic converters flow better than flowmasters. And long tube headers will help just as much as the pipes did.
could be a sword fight???? any way back to the topic 5 -15 hp maybe. however if the cat was bad and it is now tossed aside you may have had a larger gain like 15-25 or so. i like the way flowmasters sounds Jims79 has those and they sound great, and i may just put them on the hot rod
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