2015+ GT350 Mustang official power specs: 526 HP / 429 LB-FT!

[grayforge]

The original 4 banger in the S2000 rev'd to 9,000rpm. But I'd rather have a V-8 revving to 8,250.

More exhaust pulses per second. :-)

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[krt22]

Yeah, the engine could use more gear (if you are a fast shifter).

It should have at least 4.11 rear ratio to give more multiplication of the engine torque.

With 6 gears and such a broad powerband, such a tall rear end isnt really needed im guessing, otherwise ford would have used it.:shrug:

 

[Hack]

With 6 gears and such a broad powerband, such a tall rear end isnt really needed im guessing, otherwise ford would have used it.:shrug:

True - just like a flat plane crank isn't needed. Ford should offer 4.56 gears.

 

[Grimace427]

If ford is using ratios close to those on tremecs website for 576nm input (425ft-lbs), then yes that is about right, 2nd gear will run out around 81mph...3rd at a 112mph.

The R will be a few MPH less in each gear due to the smaller tires.

305/35/19 rear tires, 3.73 axle ratio, 8,250 redline:

1st: 3.253:1.............55mph
2nd: 2:233:1............81mph
3rd: 1.611:1.............111mph
4th: 1.24:3..............145mph
5th 1:1....................179mph
6th: .629:1..............1700 rpm @60mph
Reverse: 2.955:1.


With 315/30/19 rear tires:

1. 53
2. 78
3. 107
4. 139
5. 173
6. 1,800rpm @60mph

 

[grayforge]

Can almost hit 60mph in 1st. Another 5mph and it'd have a really nice 0-60 time. Not that it won't be good already.

 

[krt22]

gonna be a bad b*tch

 

[Hack]

Can almost hit 60mph in 1st. Another 5mph and it'd have a really nice 0-60 time. Not that it won't be good already.

Although it might be better to have a steeper rear gear and then the engine would have more leverage over the rear tires. I'd like to see it set up to make you shift at 30-40 mph. A couple seconds in first and then shift. Without the steep gears you don't get to take advantage of the engine's power unless you are on the track or breaking the law.

Don't fear the gear!

 

[krt22]

Yes, but with this much HP, it becomes a traction limitation so all that torque multiplication doesn't do much for you if you cant get it to the ground. And making it shift so short is really ignoring the usefulness of such a broad powerband that the voodoo was designed around. Not to mention with 6 gears they typically can get away with a shorter rear end since you arent limited by only 4 or 5 gears like you were with older gars where going with a tall rear end was a common theme, the rear end is just one part of the equation, its the final drive that matters at the end.

 

[GrabberBlue5.0]

Yes, but with this much HP, it becomes a traction limitation so all that torque multiplication doesn't do much for you if you cant get it to the ground. And making it shift so short is really ignoring the usefulness of such a broad powerband that the voodoo was designed around. Not to mention with 6 gears they typically can get away with a shorter rear end since you arent limited by only 4 or 5 gears like you were with older gars where going with a tall rear end was a common theme, the rear end is just one part of the equation, its the final drive that matters at the end.

The rear end and final drive are the same thing


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[krt22]

Sorry about that, final driveline, so factoring the transmisson, rear end, and rear tires

 

[Hack]

Yes, but with this much HP, it becomes a traction limitation so all that torque multiplication doesn't do much for you if you cant get it to the ground. And making it shift so short is really ignoring the usefulness of such a broad powerband that the voodoo was designed around. Not to mention with 6 gears they typically can get away with a shorter rear end since you arent limited by only 4 or 5 gears like you were with older gars where going with a tall rear end was a common theme, the rear end is just one part of the equation, its the final drive that matters at the end.

The amount of torque this engine makes in first gear at 3,000 rpm when the car is traveling 20 mph or the amount of torque at 1,500 rpm at 10 mph will not be overwhelming. I want more torque at low speeds to be able to accelerate from a stop.

The only purpose the final drive ratio in 6th gear has is fuel economy and cruise rpm. I'm not overly worried about either of them. What I would like is good acceleration in first gear from a stop and a final drive ratio that lets me use more than just first gear on public roads. I don't need the engine to be at 1,800 rpm at 60 mph. With 4.11 rear gears it would be at about 1,983 and with 4,56 it would be at 2,200 rpm at 60 mph. I think either of those would be very acceptable.

Maybe I'll buy a second pumpkin and swap out gears - run the steep ones in the summer and the factory gears in the winter. I know - it's early - maybe I should get the car and drive it first before I decide I have to change it.

 

[Erik427]

Hack, I think you're going to be impressed......

 

[krt22]

Yeah i think it's going to be a handful. plus all this bench racing I'm doing is based on what tremec has published, the car likely has custom ratios.

 

[TORQUERULES]

The amount of torque this engine makes in first gear at 3,000 rpm when the car is traveling 20 mph or the amount of torque at 1,500 rpm at 10 mph will not be overwhelming. I want more torque at low speeds to be able to accelerate from a stop.

The only purpose the final drive ratio in 6th gear has is fuel economy and cruise rpm. I'm not overly worried about either of them. What I would like is good acceleration in first gear from a stop and a final drive ratio that lets me use more than just first gear on public roads. I don't need the engine to be at 1,800 rpm at 60 mph. With 4.11 rear gears it would be at about 1,983 and with 4,56 it would be at 2,200 rpm at 60 mph. I think either of those would be very acceptable.

Maybe I'll buy a second pumpkin and swap out gears - run the steep ones in the summer and the factory gears in the winter. I know - it's early - maybe I should get the car and drive it first before I decide I have to change it.

More torque down low might be nice, but you still need to be able to put it down. I believe this car will find a very good balance of power to what the chassis is able to put down without slicks. Sure many may argue that with modern launch control, etc. cars can put down more than ever, but remember those aids restrict power, etc. just to get you going. The GT350 may not need as much nanny control to launch hard and get moving. I also think this thing will be much faster in a drag race than people expect.

 

[Grimace427]

Yeah i think it's going to be a handful. plus all this bench racing I'm doing is based on what tremec has published, the car likely has custom ratios.

I've already posted the gear ratios along with their respective speeds at redline with both base and R tire sizes. Post #572.

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