I found this interesting

[Tim Hilliard]

https://www.fordracingparts.com/Announcements/UltimateBoss.asp

Assuming the pistons stay together at 7500+RPM it appears you can make 500HP at the crank without too much work. I do believe the '15 cams are close to the CJ cams, although unless the CJ cams are very mild I doubt they have the same duration.

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[Grimace427]

It's interesting Ford Racing did their own aftermarket build. Guys have been putting over 500hp to the wheels with the Coyote, some more wild than others. JPC has gone over 550rwhp on a full build at 8,500rpm.

 

[Trackaholic]

Nice article. Impressive how much of a difference the intake made. Wonder if something similar will be available for the S550.

-T

 

[Pablo GT350]

https://www.fordracingparts.com/Announcements/UltimateBoss.asp

Assuming the pistons stay together at 7500+RPM it appears you can make 500HP at the crank without too much work. I do believe the '15 cams are close to the CJ cams, although unless the CJ cams are very mild I doubt they have the same duration.

I have no reservations about running this motor up to 7500, it seems to be fairly common practice. I saw that article on Saturday and immediately wondered how close the 2015 cams are to the CJ cams. Both are 13mm lift so its just a question of what the duration is. Either way it will be close enough for me as I have no plans to swap out cams. So yes 500 crank will likely be doable if not slightly expensive. Now I'm more worried about hard hard the header install will be.

Here is another article similar to the Ford Racing build
http://www.stangtv.com/tech-stories...gn=maximizing-boss-302-horsepower-ford-racing

 

[Tim Hilliard]

That's what I was thinking. I'm just waiting to see what Ford Racing comes up with for the '15. They have to have parts coming, they will be road racing these cars by mid season next year at the latest.

 

[flaps]

https://www.fordracingparts.com/Announcements/UltimateBoss.asp

Assuming the pistons stay together at 7500+RPM it appears you can make 500HP at the crank without too much work. I do believe the '15 cams are close to the CJ cams, although unless the CJ cams are very mild I doubt they have the same duration.

Doesn't the new Coyote have the same valve springs, connecting rods, and crank as the Boss motor? It should probably be able to rev that high pretty easily.

 

[scottpe]

Doesn't the new Coyote have the same valve springs, connecting rods, and crank as the Boss motor? It should probably be able to rev that high pretty easily.

Rods are the same as the Boss. Crank is rebalanced to accommodate the new rods and revised pistons, so I'm sure it's not "the same." The valve springs have changed, but most likely to accommodate the increased lift of the new cams. We don't know if they are really optimal for higher RPM (over 7K) operation like the Boss springs obviously are.

The motor may very well operate fine with the raised limiter for some period of time. But you always have to keep in mind that there is a reason the factory limiter is set where it is... and we don't know for sure what that reason is.

 

[Trackaholic]

Rods are the same as the Boss. Crank is rebalanced to accommodate the new rods and revised pistons, so I'm sure it's not "the same." The valve springs have changed, but most likely to accommodate the increased lift of the new cams. We don't know if they are really optimal for higher RPM (over 7K) operation like the Boss springs obviously are.

The motor may very well operate fine with the raised limiter for some period of time. But you always have to keep in mind that there is a reason the factory limiter is set where it is... and we don't know for sure what that reason is.

Definitely true. A big factor will be the torque curve. We know peak power and torque increased, and we suspect the low end improved due to the Charge Motion Control Valves, but we don't know what the high end is like. It might be that the intake limits the high RPM performance such that the power is falling off by 7000 RPM and there really isn't much of a point in revving higher (other than eliminating shifts in some situations). The old Boss 302 engine had its intake massaged for high RPM performance, such that it was still increasing power I think even past 7500 RPM.

If the new Coyote does something similar, then there may be some use in increasing RPM. Otherwise, you may just be hurting reliability without improving performance much.

I really want to see some dyno's of the new engine!

-T

 

[w3rkn]

Definitely true. A big factor will be the torque curve. We know peak power and torque increased, and we suspect the low end improved due to the Charge Motion Control Valves, but we don't know what the high end is like. It might be that the intake limits the high RPM performance such that the power is falling off by 7000 RPM and there really isn't much of a point in revving higher (other than eliminating shifts in some situations). The old Boss 302 engine had its intake massaged for high RPM performance, such that it was still increasing power I think even past 7500 RPM.

If the new Coyote does something similar, then there may be some use in increasing RPM. Otherwise, you may just be hurting reliability without improving performance much.

I really want to see some dyno's of the new engine!

-T

Are you guys crosstalking the RPM stuff, because you are discussing limitations of the engine, based on stock components? Or capability..?

I really want to see the 5.0's dyno too..

 

[Grimace427]

It might be that the intake limits the high RPM performance such that the power is falling off by 7000 RPM and there really isn't much of a point in revving higher (other than eliminating shifts in some situations). The old Boss 302 engine had its intake massaged for high RPM performance, such that it was still increasing power I think even past 7500 RPM.

If the new Coyote does something similar, then there may be some use in increasing RPM. Otherwise, you may just be hurting reliability without improving performance much.

Giving the numerous breathing upgrades on the 2015 Coyote it would make sense to take advantage of them with a high flow intake manifold like the Boss or CJ and rev it up to 7,500+ instead of settling with the stock manifold. Not saying having a stout midrange is not worth having, just that if you mant N/A performance then you need to be willing to rev it up high.

 

[Trackaholic]

Giving the numerous breathing upgrades on the 2015 Coyote it would make sense to take advantage of them with a high flow intake manifold like the Boss or CJ and rev it up to 7,500+ instead of settling with the stock manifold. Not saying having a stout midrange is not worth having, just that if you mant N/A performance then you need to be willing to rev it up high.

I agree that revving can be beneficial. Was just trying to make the point that increasing revs alone may not matter much depending on the rest of the components. But, it's true that if the mechanicals can take higher revs it might be very easy to get good power gains by also changing the intake to a design optimized for higher RPMs.

Main point was that the stock design is meant to work synergistically and that a mod to a single area may not be beneficial if other areas are actually the restriction.

-T

 

[allgripnoslip]

The cams also play a roll in if the engine will fall on it's face at higher RPM's or just keep pulling.

An intake manifold by itself might not do much, but an intake manifold and cams might change the world.

 

[ilkhan]

Its a large displacement V8. Its got plenty of low range torque. Optimize the breathing at high RPMs and rev it out.

 

[Lagometer]

My Ford dealer is also a Ford Racing dealer. They sell some high performance Mustangs. I'm hoping he'll play ball as far as warranty service is concerned, if I stick to those products.

 

[FiveLiterDreamer]

I want that. nothing like a 500+ hp NA V8 IMO. Except maybe a 600 hp NA!

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