Re: 2015 Mustang Ecoboost K/SA?
 

Thanks, but "Mr. 6130" was my late father- you can just call me 6130.

Re: 2015 Mustang Ecoboost K/SA?
 

You have to carry 132 more pounds and only get 5 hun on the index.
Doesn't sound like a deal to me.
(Convertible might slow you down even more)

Re: 2015 Mustang Ecoboost K/SA?
 

Yeah, I saw that.

I was just amused at the goal of 12.20 for a national record.

Re: 2015 Mustang Ecoboost K/SA?
 

Yep ^^

No way would I attempt to set a record in a vehicle that I have to drive to get me home.


Hats off to anyone that would attempt that stunt

Re: 2015 Mustang Ecoboost K/SA?
 

That's one of the reasons I said that I would have no interest in setting any records.

But it would be interesting to see someone do it. :)

Re: 2015 Mustang Ecoboost K/SA?
 

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?

Re: 2015 Mustang Ecoboost K/SA?
 

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

Re: 2015 Mustang Ecoboost K/SA?
 

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... :)

Re: 2015 Mustang Ecoboost K/SA?
 

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

Re: 2015 Mustang Ecoboost K/SA?
 

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.

Re: 2015 Mustang Ecoboost K/SA?
 

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

Re: 2015 Mustang Ecoboost K/SA?
 

Yup.

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

Re: 2015 Mustang Ecoboost K/SA?
 

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?

Re: 2015 Mustang Ecoboost K/SA?
 

The main difference between a Cobra Jet and a base Mustang is the motor combination. The way that the rules are now there is really nothing else except the weight breaks. Maybe the hood?

Re: 2015 Mustang Ecoboost K/SA?
 

To make my COPO into a Camaro we built the right motor, put the cowl stuff in, and installed a flat hood. Other than that we added a weight bar to bring it to B/SA weight.

Re: 2015 Mustang Ecoboost K/SA?
 

Okay, so you're talking about converting a factory race car like the COPO or the CJ into a regular stocker by adding additional equipment?

What advantage would a car like that have over a regular production car prepped to Stocker rules?

Re: 2015 Mustang Ecoboost K/SA?
 

Is a Strange 9" rear legal in a production Camaro?

Re: 2015 Mustang Ecoboost K/SA?
 

I was thinking of some other things too like instrument cluster and HVAC controls. Door mirrors? Did COPOs have tubular bumper supports like CJs?

Re: 2015 Mustang Ecoboost K/SA?
 

Yeah, I was going to ask the same thing, but didn't want to clutter up my post. The live-axle conversion (from IRS) would be legal, but I think the Ford 9" would need to be replaced with a GM axle to be legal as a regular Stocker.

Re: 2015 Mustang Ecoboost K/SA?
 

9" is legal for 2008-up, but it does still say "Distance between
OEM backing plates and OEM wheelbase must be maintained". One look at wheel offsets tells you the race cars have narrower axles than the street cars. I guess this rule is either ignored or doesn't apply if a 9", although it doesn't say that anywhere.


It also says "Coil-over shock or four-link adaptations prohibited". Isn't a COPO a 4 link? They have coilovers too don't they?

Re: 2015 Mustang Ecoboost K/SA?
 

Last portion of this post was very instructive.
Keep on,
Charles Stewart

Re: 2015 Mustang Ecoboost K/SA?
 

Zero. If you follow the current rules and take advantage of the aftermarket replacement parts that are allowed you will end up with the same car.

As far as the rear end width, you will have to consult the tech department. My thought is that they allow "factory spec. replacements.

Re: 2015 Mustang Ecoboost K/SA?
 

Okay, so if I'm understanding correctly, the real risk to me isn't the CJ platform itself, per se- the real risk to me would be that someone with much deeper pockets than me would develop this particular engine to the point that they cause the horsepower to be factored to the moon, making it much more difficult for me to even run under index.

Do I have that right?

Re: 2015 Mustang Ecoboost K/SA?
 

Not necessarily. But, it is a risk that we all take. As long as they don't run 1.2 under, you can protect your combination by lowering the average. I doubt that you will see many of these for a while.

Re: 2015 Mustang Ecoboost K/SA?
 

I'm not a class racer- is 1.2 the threshold for AHFS?

I just don't want to spend $20K or so on a retirement hobby, just to get torpedoed by something that I never saw coming.

Again, I have no interest in setting a record or racing at Indy- I just would like to be able to comfortably run under index.

Re: 2015 Mustang Ecoboost K/SA?
 

@ 1.20 under index then that automatically gets what is referred to as "Tuesday Horsepower" or "instant h.p." ... i.e. On Tuesday following the conclusion of that event, a percentage of hp increase ( based on how far under the 1.20 threshold the racer ran) gets added to the current factored h.p.

http://www.nhraracer.com/content/gen...633&zoneid=132

There have been times where a racer ran 1.19 under once and for the rest of the review period ( every 6 months) never ran more than .999 under index again, and the combo did not get a hp increase at the end of the review period.

Re: 2015 Mustang Ecoboost K/SA?
 

The best way someone can get into class racing is to buy a lower class turn key vehicle that is a proven combo. Say like P/SA or slower. That's how I bought my first NHRA Stocker.
I ran 1.4x under on my first pass in NHRA Stock with the car in my avatar and set the Q/SA record the same day.. There was no way I could have gotten a legal Stocker to run that far under index if I had built it myself for that amount of money.

If you want to go bracket racing with a class car, then the Stock Eliminator field is less populated in the (lower letter) classes so the odds of a heads up pairing ( with another vehicle the same class as yours) during eliminations is greatly reduced.


For $ 20K you could probably buy a turn key car, open trailer and a decent pickup tow rig

Re: 2015 Mustang Ecoboost K/SA?
 

Now that's some really good advice right there!

Re: 2015 Mustang Ecoboost K/SA?
 

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.

Re: 2015 Mustang Ecoboost K/SA?
 

Yes, you're right. But I was still curious about something else.

This part I know.

Re: 2015 Mustang Ecoboost K/SA?
 

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.

Re: 2015 Mustang Ecoboost K/SA?
 

Anyone look at NHRA engine blueprint specs ? Max compression 15.52 to 1. Are there any errors in those specs?

Re: 2015 Mustang Ecoboost K/SA?
 

I wish someone could tell me how to do that! I'm building a NA version of this motor and there isn't enough dome and head milling to get that under any condition.

Re: 2015 Mustang Ecoboost K/SA?
 

The Specs say a chamber volume of 39cc, how big are your heads?
If you follow the Specs and do the math, it comes up at 13.98. Not sure where the max compression of 15.52 comes from.


I'm with you, I don't expect you will get 15:1 with around stock bore and stroke. To get there would require a TDC volume of around 40cc. Tough to do with a deck clearance that seems more workable than the Spec of .023.

Re: 2015 Mustang Ecoboost K/SA?
 

Are you guys building 2.3 engines for Stock Eliminator?

Re: 2015 Mustang Ecoboost K/SA?
 

So is this a dished or domed piston?

Re: 2015 Mustang Ecoboost K/SA?
 

No, this is a motor for SS/Modified. Pretty much all of the dome and smallest combustion chamber and still getting enough valve relief gets you in the 15:1 range. I currently run the 2.3 Ford single cam engine but am in the process of building a Duratec motor which is an Ecoboost without the turbo.

Jim Caughlin
6019 SS/ES

Re: 2015 Mustang Ecoboost K/SA?
 

Is the stock piston from Ford a dished or domed piston ?

Re: 2015 Mustang Ecoboost K/SA?
 

We just got a 2018 Ecoboost 6 speed in today at work. K/S?

Re: 2015 Mustang Ecoboost K/SA?
 

AND this Mustang is one of the whole new generation of Stockers.

More to come..

D