OK guys, I a getting my pieces together for my exhuast and I am hearing conflicting opinions. I have 2 magnaflow X's, do I need one or both? I bought two because I had read that one would loose my torque. My car is a 93, with 4.30s and a chip. It is a non-LSC so it has single exhaust now. I was just told that 2 X's would slow me down because they do not flow good. Now I am confused, those of you with an x or xx can you help me out? I am getting a set of magnaflows, but I need this x problem solved
which one?
- Thread starter GUS
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DOHC MARK VIII
Registered
RE: which one?
I have two X-pipes and VERY non-restrictive mufflers. I lost a slight amount down low but really gained on the big end. With 4.10 or 4.30 gears, you ain't got nothing to worry about. My gears are still 3.27's.
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** Bill **
1995 LSC-R'ed w/Recaro's and Cobra R's
Veteran of Carlisle 2000/01/02/03
[a href=//cardomain.com/member_pages/view_page.pl?page_id=258112]For Pic's and Mods click here[/a]
...Learn from the mistakes of others. You can't live long enough to make them all yourself....
I have two X-pipes and VERY non-restrictive mufflers. I lost a slight amount down low but really gained on the big end. With 4.10 or 4.30 gears, you ain't got nothing to worry about. My gears are still 3.27's.
http://www.cadillacforums.com/forums/images/smilies/peelout.gif
** Bill **
1995 LSC-R'ed w/Recaro's and Cobra R's
Veteran of Carlisle 2000/01/02/03
[a href=//cardomain.com/member_pages/view_page.pl?page_id=258112]For Pic's and Mods click here[/a]
...Learn from the mistakes of others. You can't live long enough to make them all yourself....
14point6at97MPH
Registered
RE: which one?
With 4.30 gears you shouldn't need 2 x-pipes.
I have 1-X in my exhaust and could see the need for 2-x's, but I have stock 3.08 gears. I noticed when driving slow a loss of low end torque at low rpm's with my set-up.
Again, with 4.30's you should be ok with one.
Ken
With 4.30 gears you shouldn't need 2 x-pipes.
I have 1-X in my exhaust and could see the need for 2-x's, but I have stock 3.08 gears. I noticed when driving slow a loss of low end torque at low rpm's with my set-up.
Again, with 4.30's you should be ok with one.
Ken
RE: which one?
Better flow= More power.
The ONLY reason that you would lose low-end torque with a less restrictive exhaust system is that your car was not properly re-tuned with the new system.
As I understand it, the myth originated in the days of carburation when it was much harder to properly jet the entire range from idle to WOT. When the carb was jetted for the stock exhaust system then fitted with larger pipes, the engine would lose low-end torque. This is because the rich exhaust gases were expelled more completely than before, resulting in a leaner condition within the combustion chambers. If the engine wasn't properly re-tuned, the low end would suffer.
If you have your car dyno-tuned after installing your new system it will be stronger at all rpms. If you got miffed into buying two X-pipes because it will run better, sorry. But if you think that it will sound better or give you better bragging rights, then by all means install them both. But don't think that it will make your car faster because it causes restriction.
Optimally, the exhaust should be largest at the engine and decrease in size proportionally to the volumetric reduction of the cooling gases. This will keep the speed of the exhaust consistent throughout the system. The crossover pipe should be installed exactly where ordinary spray paint ceases to be burned off of your dual exhaust. I suppose that would also be the perfect location for an H-pipe or X-pipe. Anything installed past that point will only slow down the gases. Naturally, insulating the entire exhaust will keep the gases flowing faster, reducing restriction, and increasing power.
If you want it to be loud at the tips, install bells. They act like megaphones. If you want it quieter, install muffled tips.
That's all I have to say about that.
Better flow= More power.
The ONLY reason that you would lose low-end torque with a less restrictive exhaust system is that your car was not properly re-tuned with the new system.
As I understand it, the myth originated in the days of carburation when it was much harder to properly jet the entire range from idle to WOT. When the carb was jetted for the stock exhaust system then fitted with larger pipes, the engine would lose low-end torque. This is because the rich exhaust gases were expelled more completely than before, resulting in a leaner condition within the combustion chambers. If the engine wasn't properly re-tuned, the low end would suffer.
If you have your car dyno-tuned after installing your new system it will be stronger at all rpms. If you got miffed into buying two X-pipes because it will run better, sorry. But if you think that it will sound better or give you better bragging rights, then by all means install them both. But don't think that it will make your car faster because it causes restriction.
Optimally, the exhaust should be largest at the engine and decrease in size proportionally to the volumetric reduction of the cooling gases. This will keep the speed of the exhaust consistent throughout the system. The crossover pipe should be installed exactly where ordinary spray paint ceases to be burned off of your dual exhaust. I suppose that would also be the perfect location for an H-pipe or X-pipe. Anything installed past that point will only slow down the gases. Naturally, insulating the entire exhaust will keep the gases flowing faster, reducing restriction, and increasing power.
If you want it to be loud at the tips, install bells. They act like megaphones. If you want it quieter, install muffled tips.
That's all I have to say about that.
DOHC MARK VIII
Registered
RE: which one?
Better flow= More power.
The ONLY reason that you would lose low-end torque with a less restrictive exhaust system is that your car was not properly re-tuned with the new system.
........................................[/quote]
"Better flow = More power"............on the "big" end not the low end. Once you get rolling at a good clip it becomes a mute point. Gears also overcome this pretty quick as the loss is probably under 2,000 rpms and at wide open throttle, you're not there long. As I said gears will get you to those higher rpms quicker and the slight loss of lowend won't be noticed. On a mostly stock Mark VIII with stock gears a 2.25" system would probably lose less torque than a 2.5" system.
When I went to a 2.5" less restrictive system, I lost a tenth in my 60-foot times but gained 2 mph in the eighth-mile. My overall eighth-mile times are similar but I haven't been back to a quarter-mile track to see. Another Mark VIII owner who runs the Silver State/Pony Express Race in Nevada removed only his mufflers and replaced them with straight pipes and the stock tips. His comes on strong in the topend but he says he's also lost low end.
Less restriction will gain you more power in the upper ranges but some back pressure will help initally with a mostly stock motor. I used three different chips and stock and all results were the same.
** Bill **
1995 LSC-R'ed w/Recaro's and Cobra R's
Veteran of Carlisle 2000/01/02/03
[a href=//cardomain.com/member_pages/view_page.pl?page_id=258112]For Pic's and Mods click here[/a]
...If you can read this, thank a teacher...If it's in English, thank a veteran....
Better flow= More power.
The ONLY reason that you would lose low-end torque with a less restrictive exhaust system is that your car was not properly re-tuned with the new system.
........................................[/quote]
"Better flow = More power"............on the "big" end not the low end. Once you get rolling at a good clip it becomes a mute point. Gears also overcome this pretty quick as the loss is probably under 2,000 rpms and at wide open throttle, you're not there long. As I said gears will get you to those higher rpms quicker and the slight loss of lowend won't be noticed. On a mostly stock Mark VIII with stock gears a 2.25" system would probably lose less torque than a 2.5" system.
When I went to a 2.5" less restrictive system, I lost a tenth in my 60-foot times but gained 2 mph in the eighth-mile. My overall eighth-mile times are similar but I haven't been back to a quarter-mile track to see. Another Mark VIII owner who runs the Silver State/Pony Express Race in Nevada removed only his mufflers and replaced them with straight pipes and the stock tips. His comes on strong in the topend but he says he's also lost low end.
Less restriction will gain you more power in the upper ranges but some back pressure will help initally with a mostly stock motor. I used three different chips and stock and all results were the same.
** Bill **
1995 LSC-R'ed w/Recaro's and Cobra R's
Veteran of Carlisle 2000/01/02/03
[a href=//cardomain.com/member_pages/view_page.pl?page_id=258112]For Pic's and Mods click here[/a]
...If you can read this, thank a teacher...If it's in English, thank a veteran....