"Do not downshift into first when ... moving faster than 15 mph"

[raptor17GT]

Clutch-Neutral-Release-Clutch-Downshift-Release

1. Before: Flywheel / Input Shaft / Intermediate Shaft all coupled
2. Clutch: Flywheel uncoupled, Input Shaft and Intermediate Shaft coupled at old target rpm
3. Neutral: Flywheel, Input Shaft, and Intermediate Shaft all uncoupled; Input Shaft rpm spinning at old gear ratio rpm via inertia.
4. Release: Flywheel and Input Shaft coupled bringing Input Shaft to Flywheel rpm via clutch face, Intermediate Shaft uncoupled. Assumed throttle blip brings Flywheel and Input Shaft to new gear ratio rpm
5. Clutch: Flywheel, Input Shaft, and Intermediate Shaft all uncoupled; Input Shaft rpm matched to Flywheel rpm.
6. Downshift: Input Shaft couples to Intermediate Shaft already at target rpm.
7. Release: Flywheel connects to Input Shaft already at target rpm.

- as opposed to -

Clutch-Downshift-Release

1. Before: Flywheel / Input Shaft / Intermediate Shaft all coupled
2. Clutch: Flywheel uncoupled, Input Shaft and Intermediate Shaft coupled at old target rpm
3. Downshift: Input Shaft changes to new target rpm via Intermediate Shaft rpm through the synchros. Assumed throttle blip brings Flywheel new gear ratio rpm .
4. Release: Flywheel connects to Input Shaft already at target rpm.

Double clutching brings the Input Shaft speed to the new target rpm via the clutch face instead of the synchros.

a single blip of the gas while changing down does the same job rather than two stabs of the clutch plus a single blip of the gas. Your car, shift gears how you like.
TBH the rev hang while changing UP after WOT is more of a pain in the ass (clutch?) when skipping gears. That's not going to help the clutch in the slightest.

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[Sivi70980]

a single blip of the gas while changing down does the same job rather than two stabs of the clutch plus a single blip of the gas. Your car, shift gears how you like.
TBH the rev hang while changing UP after WOT is more of a pain in the ass (clutch?) when skipping gears. That's not going to help the clutch in the slightest.

Pretty sure the rev hang is to help newer stick drivers but could be completely wrong.

 

[opengl]

Pretty sure the rev hang is to help newer stick drivers but could be completely wrong.

That's always been my understanding. And yeah it stinks for driving smoothly. So glad the FP tune reduces it greatly.

 

[Zooks527]

a single blip of the gas while changing down does the same job rather than two stabs of the clutch plus a single blip of the gas. Your car, shift gears how you like.

Both match the speeds of the components within the transmission. One overcomes the inertia of the input shaft with wear of the clutch face, the other does it with wear of the cones in the synchros.

 

[raptor17GT]

Pretty sure the rev hang is to help newer stick drivers but could be completely wrong.

rev hang is for emissions apparently, I read that somewhere but could be talking rubbish lol

Both match the speeds of the components within the transmission. One overcomes the inertia of the input shaft with wear of the clutch face, the other does it with wear of the cones in the synchros.

if you let the clutch out and the engine spins up to 2400 using the gearbox to pull it up versus blipping the throttle to pull the revs to 2400 then let the clutch out to match at 2400 then its the same result. Engine at 2400 rpm.
Shifting the gearbox into first with the clutch in whether double or single dip i just don't see how it makes a difference if the road speed doesn't change during the transition. I mean it will change a bit unless you're on a perfectly matched downslope in which case I'd wonder why shifting down in those circumstances. That hairpin i described above is the only time I'd ever considering changing down into first from any gear while still going forward at anything other than a crawl and with the 5.0 i'm sure second will be more than enough to keep driving on a slight uphill. Not done this down change in the Mustang but a previous car did it (needed a good shove mind) just fine for multiple years with no crunch and no snatch with just a single bigish blip at that Applecross hairpin. 3 of them in fact. Good times.

Anyhow, we all agree it's not a likely gearshift we're gonna do (bar hairpin as above) so lets put it down the Ford Drivers manual filling in some pages.

 

[Wyzz Kydd]

I only go to 1st if I come to a complete stop. With 455 lbs torque there’s no need to.

But that’s what rev match is for, right?

 

[gadgtfreek]

I never downshift to a stop. If I'm approaching a light I just push the clutch in and coast. If it turns green, I shift into the appropriate gear and get to accelerating. If I am gonna stop Ill slid it into first around 5 or 10 mph to get the auto rev just for annoying people at the light, but I never let off the clutch it just coasts.

I'm not going to sit there and drop down through gears, push clutch in until you can start accelerating again. If its 10mph, use 2nd...

Other than that, its bouncing between 4th, 5th and 6th on a country winding road.

 

[ice445]

I only go to 1st if I come to a complete stop. With 455 lbs torque there’s no need to.

But that’s what rev match is for, right?

I know everyone thinks the Coyote makes no torque, but on my dyno sheet mine was making 300 ft/lbs at 2000RPM. It's certainly got the torque to run 2nd for pretty much anything. In fact I will regularly see just how slow I can go in second, lol. I've gotten under 1000RPM a few times and it still pulls itself forward. Like 2-3mph. I only use 1st to get going pretty much, or maybe if I need to creep really slow in a parking lot, but if you downshift at anything over 4 or 5mph, the driveline will be unhappy.

 

[WildHorse]

Go ahead and keep downshifting into first then. Test the theory.

Haha.

O/P cause shifting from 2nd to 1st puts a tremendous strain on the trans. The synchros especially. I'm guessing Ford during their tests, found a problem or potential problem, as with most other manufactures as they don't recommend 2nd to 1st while rolling above 15 mph. Peeps don't follow what Ford recommends, then bitch about why the trans blew up.

 

[RPDBlueMoon]

I downshift with my GT350 but I am not stupid about it, I only do it when I am slowing down and drop bellow 2k rpms in 2nd gear. I downshift every chance I get, the sound is irresistible

 

[Dfeeds]

Oh Riddick... stick to spaceships you silly goose.

 

[ice445]

Oh Riddick... stick to spaceships you silly goose.

As much as Pitch Black is one of my all time favorites, Vin is usually entertaining no matter what role he plays. Have you ever seen Triple X? Lol

 

[Vlad Soare]

Downshifting into first is more likely to cause damage if done incorrectly than downshifting into other gears. And the manual was probably written with the lowest common denominator in mind.
99% of the drivers will do it incorrectly unless they have the auto rev match feature. The manual is made for them, not for those select few who know how to drive properly.
The auto rev match works a treat even in first gear. And as long as that works (or you match the revs correctly yourself), the clutch will be perfectly fine.

 

[NoVaGT]

Ferchrrissakes.....

1/2 of the manual dates bake to the 1960s. Things like shifting, engine break in, and lots of other crap, is completely outdated (and generic) information to be ignored.

C'mon people, learn to think for yourselves.

 

[vanquishvzla]

surely if you blip the throttle to rev match with the shift then it won't do any damage? I can think of one corner for doing that, uphill hairpin using a bit of oversteer to get the car around. Big blip and a downshift to first gear followed by corner. Second gear doesn't rotate the car at such low speed

http://www.rosswarmemorials.org.uk/ApplecrossNfo.htm

If you need to go into 1st gear on that turn, sorry mate, you are driving too slow...

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