Re: exhaust
[Re: DusterKid]
#2541901
08/27/18 10:05 AM
08/27/18 10:05 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have a 3" system with 3" electric cut outs on my Rampage.. you will still have a drop in power but I cant say how much that is.. so with a 2 1/2" you will have a bit more drop in power over the 3"
Last edited by MR_P_BODY; 08/27/18 10:06 AM.
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Re: exhaust
[Re: MR_P_BODY]
#2541909
08/27/18 10:36 AM
08/27/18 10:36 AM
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Joined: Jan 2005
Posts: 1,775 Keymar, MD
DusterKid
OP
top fuel
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OP
top fuel
Joined: Jan 2005
Posts: 1,775
Keymar, MD
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I have a 3" system with 3" electric cut outs on my Rampage.. you will still have a drop in power but I cant say how much that is.. so with a 2 1/2" you will have a bit more drop in power over the 3" If I install the cutout in the 3" portion and use a 3" cutout, will it still hurt performance a little bit just from the fact that from the cut out back would be 2 1/2"?
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Re: exhaust
[Re: DusterKid]
#2541920
08/27/18 11:01 AM
08/27/18 11:01 AM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I have a 3" system with 3" electric cut outs on my Rampage.. you will still have a drop in power but I cant say how much that is.. so with a 2 1/2" you will have a bit more drop in power over the 3" If I install the cutout in the 3" portion and use a 3" cutout, will it still hurt performance a little bit just from the fact that from the cut out back would be 2 1/2"? Your MAIN concern is your mufflers.. you can find some mufflers that have very little back pressure ..if you get that right you wont even really need the cut outs.. I dont know if you are concerned with noise but some muffs have great noise control and low back pressure... do 2 tests on every set of muffs you try.. a DB reading(noise) and a back pressure reading.. that tells you how well they flow
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Re: exhaust
[Re: DusterKid]
#2541934
08/27/18 11:19 AM
08/27/18 11:19 AM
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Joined: Jan 2003
Posts: 13,375 Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,375
Marion, South Carolina [><]
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What kind of muffler are you using?
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: exhaust
[Re: DusterKid]
#2541976
08/27/18 12:21 PM
08/27/18 12:21 PM
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Joined: Jan 2003
Posts: 14,506 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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A lot will also depend on how muffler friendly the cam is.
30+ years ago I had a Racer Brown STX-19 ground on a 105lsa($20 garage sale find, brand new, ground in 1972)....... ran awesome with open headers....... installed 2-1/2” pipes and turbo mufflers........ and with the same idle speed setting I had been running with the open headers, when you let off the gas the motor died like you shut the key off. Turned the idle screw way in to keep it running and took it for a drive. Absolutely awful........ now power, horrible throttle response, appalling gas mileage. After a couple of weeks I swapped it out for a much smaller Crower solid on a 110, which was a tenth slower at the track(both cams run with open headers), but the motor ran beautifully with the small cam and closed exhaust.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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