AmericanMuscle 2011 Mustang GT Stock Results

AMChrisRose

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We recently took possession of our 2011 Mustang GT 5.0L Automatic. There may or may not have been excited giggling as we poured out of our offices to catch a glimpse, but we’re not at liberty to say! Our first impression: this car begs to be pushed to its limits. Small styling changes in the interior are completely overshadowed by the massively impressive upgrade under the hood.

Most of us remember the original 5.0L 302. When Ford released it, it was under-designed and under-powered, and there weren’t any real aftermarket performance parts available at first release. Thankfully, that won’t be the case this time around. The biggest names in aftermarket Mustang parts are developing sweet performance upgrades, and we’re working right alongside them. Our vendors are working with us exclusively to test parts, as well as research fitment and performance. We’re going to be building our GT the same way any enthusiast does—right here, in our garage. Along the way, we’ll be showing you more coverage of our mod strategy and giving you examples of real world numbers, both on the dyno and on the asphalt.

Needless to say, we can’t let a car sit for long. Within hours of delivery of our 2011, we were all thinking of one thing – Maple Grove Raceway. We broke it in as quickly as possible (the hardest 2 days ever!), and high-tailed it to the track this past Friday afternoon for some baseline testing. We were pleased with the times, considering we ran it at the track in its bone-stock condition. Our team laid down some impressive numbers out of the GT, with consistent times of 13.034 at 109mph and 13.022 at 110mph. Check out the awesome video below to see the team flying down the track!


Like what you see? So do we! The 2011 GT is impressive even without any modifications. We’re not sufficiently impressed to leave it stock for long, though. We’re working in conjunction with several of our vendors and using our 2011 for research, development, and testing fitment for a lot of exciting parts. While we’re at it, we’re also working on calibrations for the 2011 with our in-house dyno.

We’ve got plans for gears, exhaust products, suspension components, wheels and tires, a cold air induction system, and Bama Custom Tuning. That’s all before this beast heads back to the ¼ mile! Those aren’t the only tricks we have up our sleeves, though. Make sure you subscribe to our youtube channel and keep an eye on the blog so you’ll be the first to know when we announce the next big thing for the 2011!
We want to know what you want to see us do next! Comment below and tell us your ideas for our 2011 Mustang GT project. The most popular ideas could make it to future videos and other press coverage! Give us your predictions for the track and tell us what you’d like to see in the next video. Install footage? More track coverage and interviews? Let us know what you think.

Read more: AmericanMuscle’s 2011 GT Project Hits the Track | AmericanMuscle.com Mustang Blog
 
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2011CS

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I would love to see 28" tall tires on drag radials with 4:56 gears.

That allows for high 10's before shifting into 5th.

I can't wait to see what you guys do, so I can copy it :)

Jeff
 

tommygodfrey

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I would love to see 28" tall tires on drag radials with 4:56 gears.

That allows for high 10's before shifting into 5th.

I can't wait to see what you guys do, so I can copy it :)

Jeff

Your going to 5th with 28's and 4.56's :thumb:
 

beefcake

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did you guys catch where they said this car was an automatic?? completely different gearset than the 5 speed
 

2011CS

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Yes I did, not sure about Tommy
 

AMChrisRose

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We are going to be incorporating the gears into the project, for sure! The gear ratio is still in question... we've done some calculations between the 3.73, 4.10 and 4.30 to try and find out the appropriate gear for us. We'll be updating very shortly!
 

Bkid

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We are going to be incorporating the gears into the project, for sure! The gear ratio is still in question... we've done some calculations between the 3.73, 4.10 and 4.30 to try and find out the appropriate gear for us. We'll be updating very shortly!
Is that with a 28 inch tire?
 

timfoster405

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FOR 1ST GEAR ONLY...

The auto has a very... very... very low first gear...it is 4.17 (high number). This is compares to the 6sp manual at 3.66...or the 1st gear in the 5R which is 3.22.

Therefore, a 5R with 4.10's is EQUAL to a 2011 GT with stock gears...or... this means that from the factory, a new GT auto has the same effective gear ratio STOCK as an 05-10 mustang GT auto with 4.10s...(in first gear)

3.22 x 4.10 = 13.2.... OR 13.2 / 4.17 = 3.17 which is very close to the 2011 GT rear of 3.15.

or you can compare the effective first gear ratio between an 2011 GT auto vs. manual

An Auto - 4.17 x 3.15 = 13.14........and 13.14 / 3.66 = 3.59.... which means that an auto with a 3.15 rear gear is really has an effective 3.59 gears to be equal with a manual with 3.31's.

Conclusion... a new GT Auto with factory gears is the same as an 05-10 GT Auto with 4.10s (even though the new GT has 3.15 gears).

A new GT auto is the same as a new manual with 3.59 gears...in first gear...


So which gear for the auto's? If you go with the usual 4.10's, this will compare to a 5R with 5.30 gears !!!!

Shifting from 1/2 at 7000 rpms will be about 33 mph with 27" tall tires

Also, to cross the finish line still in 4th at 6500 rpms, you will be at 112 mph with 4.10's.
 

2011CS

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But the redline will be closer to 7500, the tires will be taller probably 28's and there is nothing wrong with 5:30 gears if your naturally aspirated and overdriven.

Do the same equations at 28 inches and 7500 or 8k.

Just saying the gears would make this thing hump :)
 

beefcake

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i'll be doing a 28" tall tire, i want to do gears once and only once.

figure n/a at some point i want to be running low 11's high 10.s

so, 4th is what, 1.09? what is a 3.55 and a 3.73, 3.90 and 4.10 good for at 7k in 4th gear with a 28" tall tire?
 

2011CS

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i'll be doing a 28" tall tire, i want to do gears once and only once.

figure n/a at some point i want to be running low 11's high 10.s

so, 4th is what, 1.09? what is a 3.55 and a 3.73, 3.90 and 4.10 good for at 7k in 4th gear with a 28" tall tire?

Using this calculator:

http://www.assassinracing.com/tech/gear_ratios.shtml

New 6R80 6-speed automatic gear ratios:

1st 4.17
2nd 2.34
3rd 1.52
4th 1.14
5th 0.87
6th 0.69

Using 7k redline and 28 inch tall tires here are your 1st 2nd 3rd and 4th gear top speeds for popular gear ratio's:

3:15's 1st 44mph 2nd 79mph 3rd 122mph 4th 162mph

3:73's 1st 37mph 2nd 67mph 3rd 103mph 4th 137mph

4:10's 1st 34mph 2nd 61mph 3rd 94mph 4th 125mph

4:30's 1st 33mph 2nd 58mph 3rd 89mph 4th 119mph

4:56's 1st 31mph 2nd 55mph 3rd 84mph 4th 112mph


Now use 7500RPM and the last 3 ratios

4:10's 134mph
4:30's 127mph
4:56's 120mph


I used this calculator:

http://www.eldemoniorojo.com/calculator.htm

to figure out the horsepower that supports top speed at the end of the quarter using 3900lbs as the figure with driver and using each of those figures and I came up with this:

134 mph supports 742 flywheel horsepower
127 mph supports 632 flywheel horsepower
120 mph supports 533 flywheel horsepower

Next I figured out HP, gear ratio, and MPH to calculate et's using this:

http://www.wallaceracing.com/accel-calc.php

And found this:

4:10s at 742 maximum HP are good to 10.13 @132mph
4:30s at 632 maximum HP are good to 10.68 @125mph
4:56s at 533 maximum HP are good to 11.31 @118mph

I am going to assume everyone shoots for the magical 10 second barrier and that most of us could use some time on the tread mill and that most of us can squeeze 600 flywheel horsepower...

Using my 4:56 suggestion at 4000lbs at starting line fueled

10.96 and 122mph

I provided all of the calculators for you to work your own combinations.

I'm running 28.62 inch tires , 4:56 gears, I weigh 247lbs, I am aiming for 600hp and my elevation at Castrol in Edmonton is 2102ft above sea level.

My custom plate read ...

11SCNDS

:beer:

Jeff
 

beefcake

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the other thing to take into account is will the aft market converters be lockup
 

GrabberBooGT

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Why would AM pick up an automatic? While not exclusively manuals, wouldn't manual transmission owners represent the bulk of the Mustang customers?
 

AMChrisRose

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I think it was simply a matter of us wanting to nail the transmission calibration on our own vehicle and have the best auto tunes available when the platform's tuning support is released to the end user. We love the manual transmission too, but we will have no problem tuning one since there are probably going to be very little differences once you pull out the auto trans calibration end. We also have access to a V6 and a manual 5.0L if we need to verify. We just wanted to be a little bit... different.
 

Greg Hazlett

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Why would AM pick up an automatic? While not exclusively manuals, wouldn't manual transmission owners represent the bulk of the Mustang customers?

Not when the auto's are running as fast if not faster than the manuals.
 
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