Detroit Steel

Following earlier speculation that the horsepower for the new Roush Stage3 Mustang would come in somewhere around 630 horsepower, we’re now learning the official number is actually much higher.

Read the rest on the Mustang Source homepage. >>

Coyote5-0

How much different are the 2015 5.0 internals compared to the 13-14?

Getportfolio

"Impressive. Most impressive."
- Darth Vader

Coyote5-0

"So you have a siissssterrr...."

hahaha completely unrelated, but your quote made me think of that one

rmurer

why do i feel like these articles are always late to the show.

Steve

A lot of power but more torque would be nice.

pebkac

Because they are and they are also a PITA to read when having to go to yet another page.....

2 Go Snake

I think that is more horsepower than the new Shelby GT. I think the Shelby GT looks a little better. Even though the Shelby GT has less power, I would choose the Shelby GT over the Roush because I like front end better.

=HYPERDRIVE=

Saleen wins in the looks department, the front of this looks like a mess design wise.

Stage_3

There are 2 different HP and TQ ranges as well, possibly. At least that is what I was told through my "inside info". The other 2 are rated at around the 700HP to even 800HP.

Stage_3

Serial #1 Roush Stage 3 670 HP car to be unveiled at Ray Skillman Ford on June 6.
(Still trying to like this '15 body style. I do like the '15 GT350 and the '15 Saleen models though. Those look best in my opinion as far as '15 Mustangs go.)

Jazzman442

There is only so many ponys to be had out of these engines in the stock block. You can put a blower or turbo, tunes and so on but to make it last this is about the most you are going to get unless you use a beefier block.

Stage_3

Beefier block or beefier internals/bottom end?
I'm sure the block and internals can handle it as it will have the Roush tune, (obviously), and it is warrantied for the 3 year/36,000 miles. Roush tunes are on the conservative side. They wouldn't let a car like this go to the public if it were going to ruin the Roush name or lose money because they are repairing all the Stage 3's that come back to the certain Roush certified shops to be repaired. I'm positive that A LOT of R&D went into this stuff.
That's just my take.

Stage_3

Well, to answer your question. I believe the internals are forged and hardened. The supercharger itself is all new for 2015 as is the air box. Both increase power by a lot. Also, the half shafts have been upgraded by Roush to withstand that extra power and torque. I'd be concerned about the transmission.
I'm curious about the Phase 2 and Phase 3 packages. I'm pretty sure the Phase 2 will bring you over 700 HP and close to 600 lbs. TQ.

***Also, I am told that the heads are more free flowing as well. Half shafts have been upgraded as well.

Stage_3

Not really interested in the Active Exhaust System, As I would just leave it on track all day every day. But here's a sample.

https://youtu.be/DNkmHNgGjvs

2 Go Snake

I will just have to check out the new Roush mustangs. I just saw a 427R mustang at a car show and was blown away at how great it looked. Some say the Roush mustangs are just a GT with the Roush name on them. From what I saw at the car show, Roush really does upgrade the Mustang and make it look more special and racy.

Stage_3

Larry,....you will not be disappointed. They are awesome cars and are built with quality control through every stage of the build. Don't take my word for it, (even though I own one), but look/drive for yourself. All with a warranty too, if need be.
Good luck.

Stage_3

I think Phase 2 RS3's should be available in the Fall this year. Looking forward to their HP and TQ numbers. I know the power will be above 700 HP for the Phase 2, not sure about the TQ.
Kyle over at Roush thinks that much more than 700 crank power to these engines is hurtful, but hasn't really gotten into it yet. So, maybe a Phase 3 RS3 may have a bit of a built engine? I'll be following.
Because they did do the dyno on the Track Pac car they were messing around with and got 750 RWHP, which is disgustingly nasty. All on 93 octane too.

Stage_3

So,.....from what I hear/am told, the Phase 2 HP rating for the new RS3 cars will be between 725/750. Not sure on what the TQ numbers will be.
(I'm guessing close to 600 lbs. of TQ.)

SteelTownStang

Are these available yet? If so, how much...?