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GregO
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I despise FakeBook with a passion. That platform has ruined many family dynamics. Unfortunately from time to time Iām forced to use it for non-entertainment purposes only.
GregO
Well-Known Member
Not to derail MBās tread, so no aftermarket company is making 5.0 F-150 firing order cams that mimic Mustang lift/duration ?
In the case of guys with aftermarket Mustang 4-1 long tube headers the Mustang no longer requires the 4-2-1 header firing order.
Also wondering if firing order and injector sequence can be changed via software vs wiring pinout changes ?
I know the injectors are not batch fired. Iām not sure if the coils are waste spark ?
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engineermike
Well-Known Member
To transfer the F150 firing order to the mustang would have a lot of, uh, challenges. Especially if you consider the individual cyl knock control, GDI timing, cam grinding, etc. Plus I really don't think the firing order change, short of an FPC, would change the sound much. The real reason the F150 sounds different is that the length of the exhaust from the head to the tailpipe is different for each bank.
In any 90 deg crank v8, the firing order is L-R-L-L-R-L-R-R, thereby having 2 cylinders on each bank on the exhaust stroke simultaneously. Since these have 90 deg of exhaust stroke simultaneously, the exhaust pulse at the collector comes through as one big pulse that, of course, alternates between banks. These big pulses exit the mustang tailpipe alternating evenly since the Left and Right banks have basically the same distance to travel to get there.
In the truck, both banks converge into a single pipe on the passenger's side, so the driver's side bank has a longer distance to travel to get there. This means that at times, the big pulses from both banks collide at the Y-pipe, combining to make one even bigger pulse every cycle.
Some like the sound of this, but in the case of a V6 it can sound rather nasty. This is why the latest Raptor and certain Jeeps have what they call a "trombone pipe" that just adds length to the passenger's side pipe by making an exhaust loop, evening out the piping lengths from both banks. IMO this sounds much nicer, especially with a V6.
I've actually been tempted to build something like this for my Roush truck to get it to sound more like a Mustang, but I see that opinion isn't popular in this thread.
In any 90 deg crank v8, the firing order is L-R-L-L-R-L-R-R, thereby having 2 cylinders on each bank on the exhaust stroke simultaneously. Since these have 90 deg of exhaust stroke simultaneously, the exhaust pulse at the collector comes through as one big pulse that, of course, alternates between banks. These big pulses exit the mustang tailpipe alternating evenly since the Left and Right banks have basically the same distance to travel to get there.
In the truck, both banks converge into a single pipe on the passenger's side, so the driver's side bank has a longer distance to travel to get there. This means that at times, the big pulses from both banks collide at the Y-pipe, combining to make one even bigger pulse every cycle.
Some like the sound of this, but in the case of a V6 it can sound rather nasty. This is why the latest Raptor and certain Jeeps have what they call a "trombone pipe" that just adds length to the passenger's side pipe by making an exhaust loop, evening out the piping lengths from both banks. IMO this sounds much nicer, especially with a V6.
I've actually been tempted to build something like this for my Roush truck to get it to sound more like a Mustang, but I see that opinion isn't popular in this thread.
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RAVAGE88
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- Thread starter
- #132
Very interesting and appreciate you chiming in. What you're saying makes @K4fxd point about emulating the truck system on the Mustang highly applicable. Makes sense that the goal should be to eliminate the colliding pulses.To transfer the F150 firing order to the mustang would have a lot of, uh, challenges. Especially if you consider the individual cyl knock control, GDI timing, cam grinding, etc. Plus I really don't think the firing order change, short of an FPC, would change the sound much. The real reason the F150 sounds different is that the length of the exhaust from the head to the tailpipe is different for each bank.
In any 90 deg crank v8, the firing order is L-R-L-L-R-L-R-R, thereby having 2 cylinders on each bank on the exhaust stroke simultaneously. Since these have 90 deg of exhaust stroke simultaneously, the exhaust pulse at the collector comes through as one big pulse that, of course, alternates between banks. These big pulses exit the mustang tailpipe alternating evenly since the Left and Right banks have basically the same distance to travel to get there.
In the truck, both banks converge into a single pipe on the passenger's side, so the driver's side bank has a longer distance to travel to get there. This means that at times, the big pulses from both banks collide at the Y-pipe, combining to make one even bigger pulse every cycle.
Some like the sound of this, but in the case of a V6 it can sound rather nasty. This is why the latest Raptor and certain Jeeps have what they call a "trombone pipe" that just adds length to the passenger's side pipe by making an exhaust loop, evening out the piping lengths from both banks. IMO this sounds much nicer, especially with a V6.
I've actually been tempted to build something like this for my Roush truck to get it to sound more like a Mustang, but I see that opinion isn't popular in this thread.
MB
GregO
Well-Known Member
To Mikes trombone point.
A business friend of mine who goes to a lot of effort balancing the tube lengths before the 2-1 merge. Most others home run that short leg to the merge. The sound quality is night and day.
A business friend of mine who goes to a lot of effort balancing the tube lengths before the 2-1 merge. Most others home run that short leg to the merge. The sound quality is night and day.
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RAVAGE88
Well-Known Member
- Thread starter
- #134
I'm intrigued by this. Adding volume to one side can be accomplished a few ways.To Mikes trombone point.
A business friend of mine who goes to a lot of effort balancing the tube lengths before the 2-1 merge. Most others home run that short leg to the merge. The sound quality is night and day.
MB
