2015 Mustang Ecoboost K/SA?

[6130]

I don't want to clutter the front page by starting another thread, but now that I understand the challenges of the 2015 Ecoboost Mustang Stocker, I would like to ask about another late-model Mustang combo- The 3.7 V-6 / 6R60 automatic SN197 2011-2014 Mustang.

Ford rates that engine at 305 horsepower, and NHRA has it factored at only 260 horsepower. It probably doesn't have the same potential to run under index as easily as the 2015 Ecoboost S550 Mustang, but being factored 45 horsepower below the OEM horsepower rating is certainly worth something in and of itself.

The classification guide lists it as a 13.08 pound (J/K/L) car with a fixed roof, and a 13.77 pound (K/L/M) car as a convertible. It would still need a roll bar in either configuration, and would absolutely need more work to run under, to include a ring & pinion, a converter, and long-tube headers. This car would also be more likely to require smaller/lighter drag-type brakes and 15" wheels. But these cars can be found for even less than a used 2015 Ecoboost. I would need a jack for this one, because I'd need to have some kind of removeable mufflers- a 6,500 rpm V-6 with a loose converter, deep gears, and open long-tube headers would not work for public roads between my house and the strip.

I'm asking about this combo, because it appears to have been in the books for a while, but if anyone were exploiting it, the horsepower factor would have been whacked already, so I'm hoping that it would run under with a stock engine, and I'm also hoping that chances of a 3.7 SN197 Cobra Jet are pretty slim.

What say ye?

[GUMP]

The V6 would most likely need a blueprint, cam, and a big stall to index.

[6130]

Originally Posted by GUMP

The V6 would most likely need a blueprint, cam, and a big stall to index.

They have run high 13s at a little over 100 mph stock, and there are youtube videos described as "all-motor", "N/A", and "bolt-on" street cars, running as quick as about 12.1x at 114 mph. Even the 12.1 car had street-ish 3.73 rear gears and appeared to have stock brakes. So I'm still hoping...

[ALMACK]

Originally Posted by GUMP

The V6 would most likely need a blueprint, cam, and a big stall to index.

Yep.

Those V-6 cars can run mid 13's with longtubes, off road exhaust, stock gears, and maybe a CAI and tune. But if you want to run 12's then things get serious.

Since it is a small naturally aspirated engine pushing a lot of weight it will not be an easy build to run index.

Might be factored too high

[6130]

Originally Posted by ALMACK

Yep.

Those V-6 cars can run mid 13's with longtubes, off road exhaust, stock gears, and maybe a CAI and tune. But if you want to run 12's then things get serious.

Since it is a small naturally aspirated engine pushing a lot of weight it will not be an easy build to run index

I think some of them run quicker than that.

And I strongly suspect that on race gas, with open headers, a loose converter, 4.56 rear end gears, and lightweight drag racing brakes, that the index should be much more attainable.

[ALMACK]

Originally Posted by 6130

I think some of them run quicker than that.

And I strongly suspect that on race gas, with open headers, a loose converter, 4.56 rear end gears, and lightweight drag racing brakes, that the index should be much more attainable.

Be a rough drive to and from the track tho....lol

[6130]

Originally Posted by ALMACK

Be a rough drive to and from the track tho....lol

Yup.

I mean, the converter would have lock-up, and the transmission has two overdrive ratios, but dang...

[6130]

Can I get clarification on the Cobra Jet issue?

In sifting through the Stock Classification Tool, it appears that the Cobra Jet is listed as distinctly different vehicle than the regular Mustang- the Cobra Jets are listed with their respective engine(s), the Mustang GT is listed with it's respective engine(s), and the base Mustang is listed with it's respective engine(s), and I'm not finding the 2.3 Ecoboost or 3.7 V-6 engines listed as being eligible for competition in any Cobra Jet.

Can somebody clear this up for me?

[goinbroke2]

Originally Posted by 6130

I don't want to clutter the front page by starting another thread, but now that I understand the challenges of the 2015 Ecoboost Mustang Stocker, I would like to ask about another late-model Mustang combo- The 3.7 V-6 / 6R60 automatic SN197 2011-2014 Mustang.

Ford rates that engine at 305 horsepower, and NHRA has it factored at only 260 horsepower. It probably doesn't have the same potential to run under index as easily as the 2015 Ecoboost S550 Mustang, but being factored 45 horsepower below the OEM horsepower rating is certainly worth something in and of itself.

The classification guide lists it as a 13.08 pound (J/K/L) car with a fixed roof, and a 13.77 pound (K/L/M) car as a convertible. It would still need a roll bar in either configuration, and would absolutely need more work to run under, to include a ring & pinion, a converter, and long-tube headers. This car would also be more likely to require smaller/lighter drag-type brakes and 15" wheels. But these cars can be found for even less than a used 2015 Ecoboost. I would need a jack for this one, because I'd need to have some kind of removeable mufflers- a 6,500 rpm V-6 with a loose converter, deep gears, and open long-tube headers would not work for public roads between my house and the strip.

I'm asking about this combo, because it appears to have been in the books for a while, but if anyone were exploiting it, the horsepower factor would have been whacked already, so I'm hoping that it would run under with a stock engine, and I'm also hoping that chances of a 3.7 SN197 Cobra Jet are pretty slim.

What say ye?

With regards to the aluminum block/heads, 4 valve per cyl, double overhead cam 3.7 v6;
The three I've drove (one being my daily driver in a f150) works fine, floor it and at 3000rpm it starts to pull hard. It doesn't "nose over" on its way to the factory shift point of 6750RPM!! This is a pick up motor! I thought it was a fluke but have driven two new transit vans with the same motor and same results.

So, in a mustang with loose converter and some gear? I can't imagine it NOT being a rocket. First gear in the 6spd is quite low so 4.56 would probably be as low as you need otherwise the 1-2 shift would be before the first revolution of the tire. lol.

Bottom line, I see a ton of potential in this engine, good flowing heads/strong bottom end and the throttle valve seems to be a good size too although I've never actually measured it. Love to see one run.

[6130]

Originally Posted by goinbroke2

With regards to the aluminum block/heads, 4 valve per cyl, double overhead cam 3.7 v6;
The three I've drove (one being my daily driver in a f150) works fine, floor it and at 3000rpm it starts to pull hard. It doesn't "nose over" on its way to the factory shift point of 6750RPM!! This is a pick up motor! I thought it was a fluke but have driven two new transit vans with the same motor and same results.

So, in a mustang with loose converter and some gear? I can't imagine it NOT being a rocket. First gear in the 6spd is quite low so 4.56 would probably be as low as you need otherwise the 1-2 shift would be before the first revolution of the tire. lol.

Bottom line, I see a ton of potential in this engine, good flowing heads/strong bottom end and the throttle valve seems to be a good size too although I've never actually measured it. Love to see one run.

Don't know if the engine is tuned the same in trucks as it is in the Mustang, but it feels pretty peppy in the Mustang too.

Ford lists the power peak at 6,500 rpm and the torque peak at 4,250 rpm, so it would need a pretty loose converter and some gearing.

The Stock Classification tool lists the throttle body as being 2.913" (74mm).

And first gear in the 6R60 transmission is 4.171.