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November 3rd, 2011, 11:43 PM
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#1 |
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Regular
Join Date: Oct 2011
Posts: 150
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Banging out noise at high RPMs
Hey guys a new day a new problem haha
 Ok heres what I got going on now, when I accelerate hard and my car hits higher RPMs like 4500-5000k at least I here this loud cutting out or banging out noise, no noticeable loss in power... I have BBK long tubes, high flow cats, and x-piped flowmasters Any ideas? Thanks in advanced 
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November 3rd, 2011, 11:52 PM
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#2 |
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Hardcore Enthusiast
Join Date: Feb 2010
Posts: 1,391
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Determine if the sound changes with RPM or MPH and get back to us.
__________________
99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber |
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November 4th, 2011, 12:51 AM
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#3 |
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Regular
Join Date: Oct 2011
Posts: 150
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RPMs for sure! Dose it when I'm going let's say 80mph and I put it in 3rd to slow down it'll bang out then also...
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November 4th, 2011, 02:15 AM
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#4 |
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Hardcore Enthusiast
Join Date: Feb 2010
Posts: 1,391
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Well if its RPM related it could be alot of things. Do you have underdrive pulleys on it or anything? I've seen balancers knock before... I hope its not a rod knock or something but if it was you would hear more than you do. Can you recreate it by reving the motor with the hood up and parked? How loud is the banging? Like a knocking type bang or somebody is hitting the side of the car with a sledge hammer lol?
R u sure its not bruttal spark knock? Is the car tuned? what mods? Give us some more background on your mods, vehicle, miles, how long you have had it, etc. If not its kinda shooting in the dark.
__________________
99 Mustang GT 446rwhp, Vortech Aftercooled, Killer Chiller @12lbs, HPX, 3.73s, MGW, Battery Relocation, Intercooler Tank Relocated, CF DF clutch, Steeda Quick Release Quadrant, 75mm TB, Ported C&L Plenum, Stock PI Cams Advance 4 degrees, Pro Chamber |
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November 4th, 2011, 03:41 AM
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#5 |
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Regular
Join Date: Oct 2011
Posts: 150
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I have the p1-sc kit w/ 3.2" pulley, 3core intercooler, 42lb injectors, fuel pump unknown, tune unknown, long tube headers high flow cats x-pipe flomasters... Car has 81,735 miles iv had it for 3 weeks...
The sound isn't a motor knock it sounds more like exhaust to me? Kinda a popping crackling noise... |
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November 4th, 2011, 06:02 AM
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#6 | |
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Regular
2003 Mustang GT
Join Date: Jul 2011
Location: Soldotna, Alaska
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__________________
 2003 Mustang GT My baby. Slowly working her up. Slowly because I am on a college budget 
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November 4th, 2011, 09:55 AM
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#7 |
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Hardcore Enthusiast
2006 mustang gt500racecar
Join Date: Jul 2010
Location: athens ohio
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could be the exhaust gasket between the long tubes and cats? silverado was doing this and i replaced the gasket and it went away. thought the truck was gonna blow for months.
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 Check out our race team! http://www.facebook.com/media/set/?s...3927011?v=wall American Iron Mustang- ^1.6 lateral gs 03 Steeda 1.2 lateral Gs-ra1 08 Gt |
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November 5th, 2011, 06:12 AM
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#8 |
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Regular
2004 Mustang GT
Join Date: Oct 2011
Location: Albany, NY
Posts: 134
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I'm hearing the same noise right now. If I lay into it, above 4k it's like a crackling noise that goes with rpms. It's only if I'm laying into it tho. Havnt figured it out yet.
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November 5th, 2011, 07:25 AM
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#9 | |
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Hardcore Enthusiast
1999 GT 35th LE
Join Date: Dec 2009
Location: Jacksonville, Florida
Posts: 1,428
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Do you have an AFR gage in your car, if so what is it reading when it makes the noise.
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 Drive it like you stole it |
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November 5th, 2011, 07:49 AM
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#10 |
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Hardcore Enthusiast
2003 Mustang GT
15.8@ 100-ish Mph
Join Date: Jun 2010
Location: Dubai - UAE
Posts: 1,376
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extremely wild guess :
Check/Replace spark plugs my mustang pops when I rev it at home...  mostly when RPM is dropping around 2.5~3k
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Dark Shadow Gray 1 mod or 2  Thanks to Sarah for the Sig!!  http://www.moddedmustangs.com/forums...-member-35708/ MM DSG Crew Member#3 |
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November 5th, 2011, 09:46 AM
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#11 |
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MM Fanatic
2000 gt
Join Date: Feb 2009
Location: La grange, KY
Posts: 4,259
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IMO since it's a blown motor, i'd take it to a tuner and get yourself a dyno tune. you know nothing about the car, not even who tuned it or how safe the tune is. just my opinion.
probably exhaust related if you ask me.
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 Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tqHARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER |
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November 7th, 2011, 12:09 AM
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#12 |
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Regular
Join Date: Oct 2011
Posts: 150
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Got a tune date at HPP in lewisville tx December 6th hopefully I'll have an answer for the noise.... Thanks guys!
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