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GT350 gears and speeds

Doc Holliday

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Why would you assume first gear will be 3.35?
My T56 magnum is the close ratio version specifically designed for road racing (like the GT350) and has a 2.66 first. It would make a lot more sense to put a 2.66 or 2.97 (or similar) first gear ratio in this box since it is specifically designed for road racing.
You don't want to do burnouts with the car on a road course, you just want to get traction and get moving.
http://www.ddperformance.com/79-04-ford-t-56-magnum/
^^^ Agreed

Jamal Hameedi did say that the transmission had "been modified fairly significantly to cope with the demands of the flat plane crank engine." Part of that could be a different gear set, hopefully. None of those gear sets really excite me for this car. All of those first gear ratios are too numerically high, especially with a 3.73 rear gear set, IMO.
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Jimdohc

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Why would you assume first gear will be 3.35?
My T56 magnum is the close ratio version specifically designed for road racing (like the GT350) and has a 2.66 first. It would make a lot more sense to put a 2.66 or 2.97 (or similar) first gear ratio in this box since it is specifically designed for road racing.
You don't want to do burnouts with the car on a road course, you just want to get traction and get moving.
http://www.ddperformance.com/79-04-ford-t-56-magnum/
Agreed, 450tq rating would be around ~2.9. I think that's minimum rating we'd want.

2.87 & 3.73 @ 8,200rpm with 305/35R19 gives 62mph in first gear.

2.87 would also give around ~455-460tq rating. Higher with upgraded output shaft and other parts.
 

Jimdohc

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why I'm thinking 62mph is goal for 1st.

ford will probably make 62mph/100kph happen at top of 1st. GT350 should have 420-430tq and stiff suspension, so i'm thinking not great launch suspension & more torque than tires can handle off the line.

Maybe 62mph at the top of 2nd like GT. But only if GT350 has less torque than I'm expecting or if it has more off the like grip than i'm expecting.
 

Doc Holliday

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why I'm thinking 62mph is goal for 1st.

ford will probably make 62mph/100kph happen at top of 1st.
I agree. While it may not be that applicable on a road course, and this car is supposed to be about handling, 0-60 is still a benchmark performance measure used by pretty much every automotive publication. That figure is usually going to be best on a performance manual car when you can reach 60 mph with having to shift into second.
 

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I'm confused. The engine is supposed to rev over 8K RPM, and you guys are saying that Ford is going to lengthen the gears???
 

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Doc Holliday

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I'm confused. The engine is supposed to rev over 8K RPM, and you guys are saying that Ford is going to lengthen the gears???
What we're saying is that we think/hope Ford will use a numerically lower first gear than what is currently listed for any of the TR-3160 gear sets. This will have a couple of effects. First of all, it will raise the top speed acheivable in first gear. Also, it will have the net effect of being able to space all of the other ratios closer together, which is important in a car like this.
 
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13JFP

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Why would you assume first gear will be 3.35?
My T56 magnum is the close ratio version specifically designed for road racing (like the GT350) and has a 2.66 first. It would make a lot more sense to put a 2.66 or 2.97 (or similar) first gear ratio in this box since it is specifically designed for road racing.
You don't want to do burnouts with the car on a road course, you just want to get traction and get moving.
http://www.ddperformance.com/79-04-ford-t-56-magnum/
I assumed 3.35 out of the optional 1st gears listed for that model transmission. I agree a 2.66 or 2.97 would be better
as long as that would improve 0-60 times. I'm sure there are other factors that affect 1st gear options.
 

Mystic_Cobra

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Do you guys think 0-60 times are the most important aspect of a track car's performance?
Of all the (forward) gears, I think first is probably the least important.

I'm no real expert, I'm just basing this off what I've learned road racing for the last 10 years or so. On most dedicated road courses (I've only raced on about 10 different ones) you only use gears 2-5. Sixth is good for cool down laps and the trip to and from the track.
 

Grimace427

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When I consider 1st gear I think about how much I have to slip the clutch when starting off, especially around town. Super tall gears would require a lot of clutch slipping. The '13-14 GT500 enjoyed an enormous torque advantage over what we are assuming will come with the Voodoo. That will likely play an important role in Ford determining which gears to choose.
 

scottpe

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Do you guys think 0-60 times are the most important aspect of a track car's performance?
Of all the (forward) gears, I think first is probably the least important.
Which is why Ford might as well take the opportunity to use that gear to maximize the car's 0-60 performance. Let's face it, this is not a pure track car. It's a dual purpose street/track car. It will be subjected to all the usual acceleration comparisons, just like the Boss was.

Regardless of a performance car's primary design purpose, acceleration stats are a big deal from a marketing standpoint. Magazine racers are all over that stuff, and in this case, they will look at those stats if for no other reason than because Mustang. Straight line performance will always be a part of the car's heritage and DNA no matter what. Ford will never completely ignore it in their design decisions.
 

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Mystic_Cobra

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Good point, Scott. As we all know, media/advertising influences a lot of people whether right or wrong, good or bad.
 

Trackaholic

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I don't think first will be good for much more than 50 MPH, and maybe not even that much. This engine isn't going to be a torque monster, and while it will have significant HP, it is unclear to me what the low end is going to be like. Also, Ford has been pretty clear in saying that this car is intended for both the street and track.

So, while a tall first gear might be great on the track (where you never use it), and while it might be great for an engine making lots of torque, I'm not sure how great it will be for this engine.

I suspect that the ratios will be close to the "options C" ratios posted earlier. Although, those did go to 55 in first, at which point you'd almost think going to 62 would be pretty similar.

-T
 

RocketGuy3

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What we're saying is that we think/hope Ford will use a numerically lower first gear than what is currently listed for any of the TR-3160 gear sets. This will have a couple of effects. First of all, it will raise the top speed acheivable in first gear. Also, it will have the net effect of being able to space all of the other ratios closer together, which is important in a car like this.
Hmmm... I suppose that makes some sense. I guess in 1st gear, this thing might have too much torque to really be used very well with shorter gear anyways.
 

RocketGuy3

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Which is why Ford might as well take the opportunity to use that gear to maximize the car's 0-60 performance. Let's face it, this is not a pure track car. It's a dual purpose street/track car. It will be subjected to all the usual acceleration comparisons, just like the Boss was.

Regardless of a performance car's primary design purpose, acceleration stats are a big deal from a marketing standpoint. Magazine racers are all over that stuff, and in this case, they will look at those stats if for no other reason than because Mustang. Straight line performance will always be a part of the car's heritage and DNA no matter what. Ford will never completely ignore it in their design decisions.
As someone who tracks his car and also likes to have fun on the street (responsibly, of course ;) ), I think you're understating the value of a 0-60 time... Sure, it's not very meaningful if ALL you're going to do with the car is drive closed circuit tracks, but that's not the only thing that's fun to do even with a track-built car. People who drag race their car will be interested in acceleration from a dig, too, and the track crowds and drag crowds aren't mutually exclusive. Plus, a 0-60 time is indicative of stoplight and on-ramp fun potential.

I think it's kinda closed minded to dismiss 0-60 as only useful for magazine racers.
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