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Old 05-13-2016, 04:14 PM   #1
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Phase II supercharger

How is Roush able to get 727 HP out of the Stage II SC for the 15-16 5.0's but 625 HP for the 2014 Stage II SC for the 5.0's? Its the same coyote engine unless I'm mistaken less 10 HP so how are they getting 100 more HP?



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Old 05-13-2016, 04:31 PM   #2
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Has many Road Runner components in it, I guess. Maybe they improved the blower as well.


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Old 05-13-2016, 05:01 PM   #3
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The 2015+ has much stronger rods in it, they can put more power through it without worrying about blowing up the bottom end. Also the heads do flow better and they use better cams too IIRC.
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Old 05-13-2016, 06:00 PM   #4
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The 2015+ has much stronger rods in it, they can put more power through it without worrying about blowing up the bottom end. Also the heads do flow better and they use better cams too IIRC.
Thanks sir. That makes sense.

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Old 05-13-2016, 07:39 PM   #5
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Yeah the "Boss" rods became standard I think even on some S197 Coyotes but not sure 100%. The Boss rods are so strong that lots of ppl get them to use in their builds, they'll hold up to 800 no problem.
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Old 05-13-2016, 08:16 PM   #6
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Yeah the "Boss" rods became standard I think even on some S197 Coyotes but not sure 100%. The Boss rods are so strong that lots of ppl get them to use in their builds, they'll hold up to 800 no problem.
Let me ask you this sir! Typically what power can an 11-14 5.0 engine block handle on factory internals? What rwhp and rwtq can the 11-14 5.0 handle without issues on factory internals.

727 HP to the crank is what approximately to the wheels? If you were to take an educated guess.

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Old 05-13-2016, 08:40 PM   #7
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Let me ask you this sir! Typically what power can an 11-14 5.0 engine block handle on factory internals? What rwhp and rwtq can the 11-14 5.0 handle without issues on factory internals.

727 HP to the crank is what approximately to the wheels? If you were to take an educated guess.

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There is usually a 12% to 15% drive train loss to the rear wheels.
That would mean that 727 HP would become between 639.76 and 617.95 at the rear wheels................approximately.....
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Old 05-13-2016, 09:24 PM   #8
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There is usually a 12% to 15% drive train loss to the rear wheels.
That would mean that 727 HP would become between 639.76 and 617.95 at the rear wheels................approximately.....
Based on that power level, can a 11 to 14 5.0 engine block handle that power on Factory internals

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Old 05-13-2016, 10:06 PM   #9
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Based on that power level, can a 11 to 14 5.0 engine block handle that power on Factory internals

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It's flywheel HP that is beating on the engine internals, not wheel HP. 727 HP is WAY too much for non forged internals.
That's not to say that the internals could not be switched out for stouter ones -- but stock? Much safer to stay around 525 to 550 HP or so at the flywheel.
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Old 05-13-2016, 10:09 PM   #10
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Word on the street is the stock non boss rods start to get flaky at the 650 mark but I'll let actual coyote owners chime in.

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Old 05-13-2016, 10:11 PM   #11
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It's flywheel HP that is beating on the engine internals, not wheel HP. 727 HP is WAY too much for non forged internals.
That's not to say that the internals could not be switched out for stouter ones -- but stock? Much safer to stay around 525 HP or so at the flywheel.
Wth are you talking about? The S550 crank is forged, rods are sinter forged and known to be good up to and past 800. Pistons are stout too. Roush would not make that number and sell the car if the motor couldn't handle it. Plenty of Boss Mustangs at and above the 700 mark because the internals are more than enough for it.

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Old 05-13-2016, 10:15 PM   #12
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Wth are you talking about? The S550 crank is forged, rods are sinter forged and known to be good up to and past 800. Pistons are stout too. Roush would not make that number and sell the car if the motor couldn't handle it. Plenty of Boss Mustangs at and above the 700 mark because the internals are more than enough for it.

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He's talking about the 11-14 5.0's


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Old 05-13-2016, 10:28 PM   #13
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Based on that power level, can a 11 to 14 5.0 engine block handle that power on Factory internals

Just a near stock 3.7

It can handle it. The question is for how long. There's are several 11-14 cars in that power range, but only time will tell what the durability will be like.


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Old 05-13-2016, 10:33 PM   #14
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Wth are you talking about? Not the S550....The S550 crank is forged, rods are sinter forged and known to be good up to and past 800. I know... Pistons are stout too. Yup, they are!.... Roush would not make that number and sell the car if the motor couldn't handle it. Plenty of Boss Mustangs at and above the 700 mark because the internals are more than enough for it. Ford did indeed build the new Coyote to handle incredible power increases............
see above............
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Old 05-14-2016, 12:04 AM   #15
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I'd like to chime in, I have a buddy that I met at caffeine and octane and he has a 14 5.0 with the vmp supercharger and he's pushing about 720 crank he's also had it for half a year on stock internals. But like someone said above only time will tell.


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Old 05-14-2016, 12:10 AM   #16
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I'd like to chime in, I have a buddy that I met at caffeine and octane and he has a 14 5.0 with the vmp supercharger and he's pushing about 720 crank he's also had it for half a year on stock internals. But like someone said above only time will tell.


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My father has a 14 5.0 and purchased a stage 2 Roush blower , 625 HP. Roush is doing the install next week. I'm going to assume since Roush is warranty of 3 years 36 months is it safe to say 625 HP is plenty safe for the 5.0 with factory internals.

My father was just wondering why the stage 2 kit for the 15-16 model year had 100 more HP than his stage 2 from one year earlier. Lol! I now have explained to him the S550 has a built stronger coyote engine over the 11-14 5.0's.

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Old 05-14-2016, 12:13 AM   #17
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Sounds to me , if you want power the S550 is a better platform than the S197 from an engine standpoint. Are the pistons and crankshaft forged on the S550 or just the rods?

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Old 05-14-2016, 12:16 AM   #18
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Sounds to me , if you want power the S550 is a better platform than the S197 from an engine standpoint. Are the pistons and crankshaft forged on the S550 or just the rods?

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Yeah I didn't know they had different internals. I thought they were all the same, learn something new everyday.


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Old 05-15-2016, 08:19 AM   #19
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Yeah I didn't know they had different internals. I thought they were all the same, learn something new everyday.


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From what I understand there isn't anything different from the 13-14 models. The rods are coated but not forged, the crank has always been forged. What exactly are guys claiming as different in the 15+ cars?




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Old 05-15-2016, 08:23 AM   #20
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Wth are you talking about? The S550 crank is forged, rods are sinter forged and known to be good up to and past 800. Pistons are stout too. Roush would not make that number and sell the car if the motor couldn't handle it. Plenty of Boss Mustangs at and above the 700 mark because the internals are more than enough for it.

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All of what you said has been the case since 2013. Nothing different for the s550


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Old 05-15-2016, 10:36 AM   #21
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As others here have stated, I thought that the pistons in the new S550 5.0 were forged. According to this article below, only the rods and crank are forged, and the pistons remain hypereutetic .........is this true? If the new 5.0 is good for 800 HP, I just can't see this type of piston lasting in that environment......

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Old 05-15-2016, 10:48 AM   #22
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Old 05-15-2016, 11:07 AM   #23
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As others here have stated, I thought that the pistons in the new S550 5.0 were forged. According to this article below, only the rods and crank are forged, and the pistons remain hypereutetic .........is this true? If the new 5.0 is good for 800 HP, I just can't see this type of piston lasting in that environment......

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I think as long as the tune is good the pistons will hold a good amount of power. They just don't take much of a beating before they break. If something gets out of wack with the tune then failures will happen.

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Old 05-15-2016, 11:21 AM   #24
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It's flywheel HP that is beating on the engine internals, not wheel HP. 727 HP is WAY too much for non forged internals.
That's not to say that the internals could not be switched out for stouter ones -- but stock? Much safer to stay around 525 to 550 HP or so at the flywheel.

I got 675 flywheel😵😵😵


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Old 05-15-2016, 11:31 AM   #25
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^ ticking time bomb. 😱


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Old 05-15-2016, 11:38 AM   #26
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I think as long as the tune is good the pistons will hold a good amount of power. They just don't take much of a beating before they break. If something gets out of wack with the tune then failures will happen.

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I've seen Pistons go 13-14 cars got at much less hp. The problem is...without forged pistons, it's a game of chance, and waiting game really.


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Old 05-15-2016, 11:51 AM   #27
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I've seen Pistons go 13-14 cars got at much less hp. The problem is...without forged pistons, it's a game of chance, and waiting game really.


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Yep thats why the tune needs to be as good as it can be to buy you as much time as possible. But it isn't the end of the world for everyone if an engine pops. If you can't afford the consequences don't gamble. Based on other peoples experiences Im gambling on my engine giving me a good amount of service at 593 rwhp for a while. It might last. It might not. Im going to enjoy it until it gives up and build it stonger when it needs it.

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Old 05-15-2016, 12:03 PM   #28
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Something I was wondering is I know the Boss calls for 5w-50 oil and someone else has mentioned the Performance Pack Mustangs also calls for 5w-50. Is it just the Performance Pack Mustangs that get the better Rods?


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Old 05-15-2016, 12:09 PM   #29
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All of what you said has been the case since 2013. Nothing different for the s550


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Supposedly but people have found older rods in 13/14 cars, maybe they got unlucky and got one where Ford was using up all the old stock?

The S550 heads and cams and intake are indeed different tho. Not drastically.
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Old 05-15-2016, 02:45 PM   #30
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Supposedly but people have found older rods in 13/14 cars, maybe they got unlucky and got one where Ford was using up all the old stock?



The S550 heads and cams and intake are indeed different tho. Not drastically.

You are correct. I believe the early builds didn't have them. It started a couple months into production. I remember that being a topic of discussion.


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Old 05-15-2016, 02:46 PM   #31
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Something I was wondering is I know the Boss calls for 5w-50 oil and someone else has mentioned the Performance Pack Mustangs also calls for 5w-50. Is it just the Performance Pack Mustangs that get the better Rods?


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Yep pp only. It's because they assume you'll track the car therefore needed thicker oil.


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Old 05-15-2016, 04:08 PM   #32
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Something I was wondering is I know the Boss calls for 5w-50 oil and someone else has mentioned the Performance Pack Mustangs also calls for 5w-50. Is it just the Performance Pack Mustangs that get the better Rods
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Yep pp only. It's because they assume you'll track the car therefore needed thicker oil.
2015 up Performance Pack cars use 5W-20 oil, just like the non PP cars.
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Old 05-15-2016, 04:11 PM   #33
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2015 up Performance Pack cars use 5W-20 oil, just like the non PP cars.

I know. I meant 11-14


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