5.0L General Discussion This section is for non-tech specific information pertaining to 5.0L Mustangs.

Octane rattle?????

Thread Tools
 
Search this Thread
 
Old Jul 27, 2010 | 12:46 AM
  #11  
badlx87's Avatar
badlx87
2nd Gear Member
 
Joined: May 2010
Posts: 448
From: Illinois
Default

Originally Posted by mjr46
oh my gosh......do we really need to dispell this exhaust myth thing again, it's like beating a dead horse...backpressure...lol such a thing is for slow 5.0's
Yea that would be nice. I haven't actually read any discussions about back pressure and such. Just heard from many people what I have stated, not that I'm saying it right because I haven't actually seen dyno numbers to prove it.
Old Jul 27, 2010 | 05:35 AM
  #12  
codyhavens35's Avatar
codyhavens35
Thread Starter
 
Joined: Jul 2010
Posts: 4
From: ohio
Default

ok well i did have two and a half inch exuast all the way back then my girl thought she was gunna do something nice so she went and had them put on and beleive it or not itsounds great just a lil loud and the timing has been retarded a lil bit it started dong it after i had a distributor put on though. like i sid it only makes trattle and power loss when im in the pettle but now i have lost so much power it takes more for the car to get it going so it runs a lil higher rpms and i had a guy with an obd2 mac computer check the diagnostics bc i have a check engine light on and it says mass air flow and o2 sensors but idk.
Old Jul 27, 2010 | 05:36 AM
  #13  
codyhavens35's Avatar
codyhavens35
Thread Starter
 
Joined: Jul 2010
Posts: 4
From: ohio
Default

and i got a thousand dollars to spend wanna fix my problem and add on wats to do?
Old Jul 27, 2010 | 06:59 AM
  #14  
mjr46's Avatar
mjr46
D.R. THE PATHETIC DORK
 
Joined: Jun 2007
Posts: 30,871
From: West Virginia
Default

Originally Posted by badlx87
Yea that would be nice. I haven't actually read any discussions about back pressure and such. Just heard from many people what I have stated, not that I'm saying it right because I haven't actually seen dyno numbers to prove it.
plain and simple, if said where true...why does a guy run open headers at the track and pick up a tenth or two when doing such?? exactly my point........and if you want to read and can't view the link sign up to be a memger of this sight, it will enlighten/ broaden your perspective:

http://sbftech.com/index.php/topic,19160.0.html
Old Jul 27, 2010 | 08:20 AM
  #15  
ProTrickVic's Avatar
ProTrickVic
2nd Gear Member
 
Joined: Jun 2010
Posts: 269
From: Iowa
Default

oh my god...i feel like i'm going to have a conniption every time i hear "no back pressure kills your low end"
Old Jul 27, 2010 | 08:20 AM
  #16  
02WhiteGTVert's Avatar
02WhiteGTVert
3rd Gear Member
 
Joined: May 2007
Posts: 910
From:
Default

optimal back-pressure is 0. To learn more about detonation view my signature.
Old Jul 27, 2010 | 08:23 AM
  #17  
02WhiteGTVert's Avatar
02WhiteGTVert
3rd Gear Member
 
Joined: May 2007
Posts: 910
From:
Default

Oh and P.S. Octane rating is a fuels' resistance to burn. Running a higher octane ("supreme") is for when you experience detonation (pre-ignition,fuel igniting before the spark plug fires) with lower octane ratings. This occurs from advanced timing/F.I.
Old Jul 27, 2010 | 08:43 AM
  #18  
JD1969's Avatar
JD1969
Pro. B.S. caller outer
 
Joined: May 2004
Posts: 9,644
From: IL
Default

Originally Posted by codyhavens35
ok well i did have two and a half inch exuast all the way back then my girl thought she was gunna do something nice so she went and had them put on and beleive it or not itsounds great just a lil loud and the timing has been retarded a lil bit it started dong it after i had a distributor put on though. like i sid it only makes trattle and power loss when im in the pettle but now i have lost so much power it takes more for the car to get it going so it runs a lil higher rpms and i had a guy with an obd2 mac computer check the diagnostics bc i have a check engine light on and it says mass air flow and o2 sensors but idk.
I am going to take a stab at it, even though reading your posts makes my eyes bleed (that's a hint to use some periods, maybe a comma or a paragraph). If it started doing this after the new distributor was put in, then that is where you need to start your search. Double check the timing, is it installed correctly? Check the firing order. And please, in the future, try and write a little better, it really helps us to help you.
Old Jul 27, 2010 | 12:25 PM
  #19  
projectresto83's Avatar
projectresto83
M.A.D. Motorsports
 
Joined: Jul 2006
Posts: 8,014
From: Indiana
Default

Originally Posted by mjr46
plain and simple, if said where true...why does a guy run open headers at the track and pick up a tenth or two when doing such?? exactly my point........and if you want to read and can't view the link sign up to be a memger of this sight, it will enlighten/ broaden your perspective:

http://sbftech.com/index.php/topic,19160.0.html

OO come one Mike, can't we bring in portmaster again lol
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
AmericanMuscle4.6GT
2005-2014 Mustangs
7
Nov 10, 2015 02:06 PM
UrS4
S197 Handling Section
1
Sep 30, 2015 10:13 AM
2015Ecoboost
New Member Area
3
Sep 17, 2015 01:48 PM
Big Al's 03
4.6L (1996-2004 Modular) Mustang
5
Sep 15, 2015 09:05 AM
tmdm
2005-2014 Mustangs
1
Sep 4, 2015 06:45 PM




All times are GMT -5. The time now is 11:26 PM.