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#1
06-14-2005, 03:14 PM
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i plan on a new 2.5 inch x pipe sysyem in my 68 gto conv. can some please tell me the pros a and cons of a DUMP PIPE VS A NON DUMP SYSTEM OTHER THAN THE NOISE PLEASE. it about 80.00 diffents but the cost is not important. thanks ps am also going from a stock exhast to ram air manifolds w 2.5 pipes with street pro mufflers. how much hp should i gain ,and will i feel at low or high speeds. also my motor as some proformance upgrade, 30 milled heads, value job, milded cam work, ported heads, 750 holly carb, proforace intake, by adding this new exhust it should really help dont you think iam hoping for a notcible diffents. thanks
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#2
06-14-2005, 03:14 PM
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i plan on a new 2.5 inch x pipe sysyem in my 68 gto conv. can some please tell me the pros a and cons of a DUMP PIPE VS A NON DUMP SYSTEM OTHER THAN THE NOISE PLEASE. it about 80.00 diffents but the cost is not important. thanks ps am also going from a stock exhast to ram air manifolds w 2.5 pipes with street pro mufflers. how much hp should i gain ,and will i feel at low or high speeds. also my motor as some proformance upgrade, 30 milled heads, value job, milded cam work, ported heads, 750 holly carb, proforace intake, by adding this new exhust it should really help dont you think iam hoping for a notcible diffents. thanks
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#3
06-14-2005, 03:45 PM
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Dumps are great if you are planning on racing or your pissed at your neighbors. Dumps basically eliminate the mufflers and tailpipes from the equation (which can restrict the flow of your exhaust, reduce horsepower and quiet down the sound) when you have them open. Lots of racers will drop their entire exhaust after the manifolds when they race but with dumps, you just uncap them and get the same performance boost.
I'd say, if you are planning on racing, consider the dumps. If you aren't racing, they won't have much appeal to you. What does everyone else think?
__________________
 "No you fool, we're following orders. We were told to comb the desert so we're combing it." 
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#4
06-14-2005, 04:21 PM
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You don't need dumps with a system like yours.
I bet it will be a quick street car with the setup that you are mapping out but putting dumps on this kind of setup is like showing up at a kegger party with teacups
__________________
Knock Knock Knockin' on 11's Door '70 Judge, Palladium Silver w/Red Interior Powered by SD Performance, Ported 6X Heads 501 HP, 554 ft lbs TQ 12.14 ET @ 114 MPH , Supercase Muncie M22, 3:55 Suspension: HO Racing, BMR< Sykorat, and Bilsteins Narrowed 12 bolt , 16x8 VintageWheel Works, Comp T/As on street, MT Drag Radials @ Strip http://www.sdperformance.com/custome...1.php?carID=42 |
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#5
06-14-2005, 04:56 PM
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No Dumps... Been there done that.
Let the people trying to catch you have your exhaust 
__________________
--------------------------------------------------------- "And he Asked, Who Owns This Car? With The Peace Sign, Mag Wheels, and the Four on the Floor?? --------------------------------------------------------- |
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#6
06-14-2005, 05:09 PM
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Why get dumps?? Performance!!!
Nice thing about dumps....you dont have to run un-corked if you dont want to. I only un-cork mine when I race...and when I want to make the babies cry at parades.
__________________
71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile |
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#7
06-14-2005, 07:47 PM
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I agree ..next time at track i am going to run with and without to see how much they gain me?...I'll let you know...may not be as much as i think since i run a 3" x into 2 1/2 ultraflows...will see.
My dumps are after the x also....
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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#8
06-14-2005, 08:21 PM
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When I was running my old 350 and 2-1/2" exhaust I would lose almost 2 tenths if I uncorked it.
Now with the 462 I don't bother. I don't think uncorking a 3" system will do any good. Maybe one of these days I'll open 'em up for kicks and giggles and see what happens.
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Freedom is never more than one generation away from extinction. We didn't pass it to our children in the bloodstream. It must be fought for, protected, and handed on for them to do the same. -RONALD REAGAN 462 cid/ 6x-4/ TH400/ 3.36:1/ 28x10.5/ 3880#/ 12.35 @ 109.36/ 1.69 60 ft/ 4 wheel disc brakes/ 15 mpg  |
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#9
06-15-2005, 12:15 AM
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All depends on your combo. Some cars will run slower uncorked some faster. A friend of mine with a Camaro with big block Cheby power gained almost .3 in the quarter when he uncorked.
__________________
"It is foolish and wrong to mourn the men who died. Rather we should thank God that such men lived."- General George Patton "Perpetual peace is a futile dream."-General George Patton "I predict future happiness for Americans if they can prevent the government from wasting the labors of the people under the pretense of taking care of them."-Thomas Jefferson "Any society that would give up a little liberty to gain a little security deserves neither and will loose both."-Benjamin Franklin |
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#10
06-15-2005, 07:40 AM
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Anyone ever try the elec. switch cut-outs sold by DMH Performance? A bit pricy, but could be "priceless" on an occasion next to a ricer at a stoplight!
__________________
CT Gross---66 GTO "Its never too late to have a happy childhood"! I told my dad I was going to stop raising hell, and he called me a quitter! |
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#11
06-15-2005, 08:54 AM
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I have the DMH electrics on my 65 and love them!
Pulling in and out of Cruise nights has a whole new meaning now. 
__________________
_________________________ _________________________________ http://www.youtube.com/watch?v=_qZgOpn-w-o <<< Burnout Video  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Treat Me Good, I'll Treat You Better; Treat Me Bad, I'll Treat You Worse" Sonny Barger ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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#12
06-15-2005, 05:55 PM
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I have electric dumps on a Pypes Xchange 2.5" X pipe. On the dyno with the dumps open, the car went from around 300 hp to around 310hp peak and a little more torque. I don't remember the actual increase.
__________________
--------------------------- Fool Around, Get Hurt, Don't come Crying to me. |
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#13
06-15-2005, 08:27 PM
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I run about a tenth quicker with them open even with a 3" exhaust including an x-pipe.
__________________
_________________________ _________________________________ http://www.youtube.com/watch?v=_qZgOpn-w-o <<< Burnout Video ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "Treat Me Good, I'll Treat You Better; Treat Me Bad, I'll Treat You Worse" Sonny Barger ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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#14
06-22-2005, 01:15 PM
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As far as electric dumps go, have any of you guys down there had this problem? Here in BC I know a couple guys who got checked by eager beaver cops. They were fined & told to remove dumps. seems up here cable or electric is illegal, but bolt on is ok because you have to stop & get out to uncap them. Guess it depends on the cop too.
__________________
Some Fear, Because if you've never been afraid- just a little. You're obviously not going as fast as you could be. |
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