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2015 Mustang GT vs. 2016 Shelby GT350 Dyno

Discussion in '2015+ Shelby GT350 Mustang' started by EditorTurner, Jan 28, 2016.

  1. EditorTurner

    EditorTurner New Member Established Member

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    0 Mustang GT vs Shelby GT350 Featured.jpg
    Coyote vs. Voodoo
    Comparing the power of a 2015 Mustang GT and a 2016 Shelby GT350
    By Steve Turner

    In recent weeks we visited VMP Performance to document the dyno testing and tuning of two brand new Mustangs. The company recently acquired a 2015 Mustang GT slated for all-out race car duty in the NMRA’s Coyote Modified class. The other new project is a 2016 Shelby GT350, which is destined to live the life of a jack-of-all-trades while maintaining its streetability. Since we were there to see the baseline testing of both cars, we thought it might be fun to compare the output of the two in stock form to see just how much difference there is between the everyman’s GT and the top dog GT350.
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  2. SID297

    SID297 OWNER/ADMIN Staff Member Administrator

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    Excellent comparison Steve. Looks like the GT350 doesn't really start to stretch it's legs (compared to the 5.0) until 4700 RPM.
     
  3. saf1

    saf1 New Member Established Member

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    That 350 just keeps pulling power well into the 8,000 RPM range. Did Ford govern or limit that because it looks like it could keep going.

    Also with that power band what is their track target? Seems like the car would prefer stretches of longer roads than shorter.
     
  4. tt335ci03cobra

    tt335ci03cobra Well-Known Member Established Member

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    It has a great gearing/power spread from 30mph to 130mph or so. You can be a gear too high or a gear too low in that range and it will still pull very strongly/remain deep in its broad power range. It basically has great acceleration from 4-8,000 rpm.

    1st is a tall gear for the powerband, and hits about 55mph at redline. 5th is tall but usable, 6th is too tall to really accelerate at much over 160 I'd imagine. I believe it about a .70 to .60, ratio while 5th is a 1.0
     
    Last edited: Jan 28, 2016
  5. tvspower

    tvspower Active Member Established Member

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    Then all is needed is a rear gear change??? Say to a 390.
     
  6. DSG2003SVT

    DSG2003SVT Gray only, please Established Member

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    Ford just released 4.09 gears for the Super 8.8 in the S550 IRS. That's the only option that's steeper than a 3.73 right now. I think 4.09s would be great in the GT350, but you'd lose a little of the flexibility of the 3.73s on the road course. It depends on what you want from the car really.
     
  7. Red dragon

    Red dragon Active Member Established Member

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    Let me ask you something. I have a 2016 gt, and I find 6th gear to be absolutely useless. I could be doing 110-120 in 5th, at around 5500-6000 rpm, and when I put it in 6th it just bogs down to 2500-3000.. and it just takes forever to get going again. Now with the 4:09 gears coming wouldn't that bring 6th gear to life? And especially through the other gears? Wouldn't the new gears just light the tires on fire? Thanks in advance.
     
  8. tomshep

    tomshep Another R Addict Established Member

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    6th isn't a "performance" gear. Is is in the .6? overdrive range. It is for mileage and highway driving.

    Tom
     
  9. Red dragon

    Red dragon Active Member Established Member

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    So wouldn't 6th become more of a performance gear(useful gear) if I swapped out the 3.73 for a 4.09? Or would it remain the same as it is now? And just so you know, I'm only asking because I honestly don't know the answer. I'm not trying to say you're wrong, I'm honestly asking because I don't know. Thank you for the response.
     
  10. THE_EVIL_TW1N

    THE_EVIL_TW1N Member Established Member

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    I would have to say no. It's a little more useful,but still a fuel saving gear.
     
  11. Red dragon

    Red dragon Active Member Established Member

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    Thanks alot guys. So just so I understand the difference between the 2 gears. Om currently running the 3.73, if I change to the 4:09, what difference will I see? I thought it would rev higher in the gears, having to go through the gears faster then I am right now. Under that assumption, I thought that trend would continue to 6th meaning it would rev higher in 6th also. Thanks for hanging in there with me guys.
     
  12. GT Premi

    GT Premi Well known member Established Member

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    You are correct, but 6th gear is still too tall to be a "performance" gear. It'll pull more, but it's still not going to be great. It would come alive with, say, a 4.56 ring gear, but driving around town would be brutal.
     
  13. Red dragon

    Red dragon Active Member Established Member

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    I got it now. Thank you for your explanations... Once these gears are available I'm getting them. I'm doing the power pack 3 and the 4:09 gears. At the very least it will wake the car up... You guys have a great weekend.
     
  14. Rael

    Rael Member Established Member

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    But realize that your lower gears will become a bit less useful--and those're the ones you (normally) use more.
     
  15. Red dragon

    Red dragon Active Member Established Member

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    Meaning I will have to shift through them quicker because I will go through them faster?
     
  16. Rael

    Rael Member Established Member

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    Well, yeah, sort of. You could end up with a gear (or gears) just not being very useful anymore. There are 5 gears spread out in the range to 1:1. If you put in bigger gears, you're shifting the whole range.

    I think one of the points above is that yes, you can increase power in 6th, but since that gear is meant for cruising, you'll lose some of its purpose while also taking away some of the lower gear range.

    (But I've never run larger than 3.73s.)
     
  17. Red dragon

    Red dragon Active Member Established Member

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    Thanks for explaining it. I wish it wasn't so expensive to do. It's like I gotta get it right the first time. It's about a 12 hour job. If it wasn't so labor extensive, I could do it, if I didn't like it, go back to the 3:73. But if I do it, I'm gonna have to like it Atleast for a good while... maybe I'll do the power pack first, maybe the new power will make 6th alittle better to my liking.. then I'll decide.. and lastly, will the track pack help with that nasty wheel hop? That's embarrassing..
     
  18. GT Premi

    GT Premi Well known member Established Member

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    A gear change is not a 12 hour job. Whomever quoted you that time is trying to rip you off. I believe book time for a gear change is 2 or 3 hours.

    Sent from my BlackBerry. The blacker the 'Berry, the sweeter the use!
     
  19. Red dragon

    Red dragon Active Member Established Member

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    I know in the previous models it was alot easier. I didn't think nothing of it, I actually assumed it was gonna take longer to do because of the irs. I'll have to ask them why it will take so long.
     
  20. Voltwings

    Voltwings Well-Known Member Established Member

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    Just because you go through the gears faster, does not mean you are accelerating faster. The more power you have, the less gear you need, why do you think vettes have long ass gears? I would never put a 4.09 on an engine this powerful.

    I had a 3.31 geared coyote, my wife has a 3.55, and my mother has a 3.73 (we're a mustang family). Personally, the 3.31 was my favorite, but i could see it being a bit much on this engine. The 3.55 is nice, but is about as much as i would go, i already feel like the 3.73 is WAY too much shifting... a 4.09 ... i would shoot myself. I really dont see it being beneficial in anything other than 1/4 mile driving.
     

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