5 second limit explained?

[Mirak]

Delimiting doesn't seem important or useful at all, especially when you can already go 0-60 in 3.5 seconds?

But I guess it matters to somebody springing for a “GT Performance” model. It’s just funny that this is such a popular topic. Must have a whole lotta GT folks here.

Sponsored

 

[Mirak]

The problem is that it's not limited to 5 seconds. It start at 0 seconds once you're above 72mph. Not sure where you're located, but there are places in the US where the avg speed on the hwy is above that. So pressing the pedal to pass will give you less "go" then you're expecting. This is what you're experiencing with the "underwhelming" higher speed acceleration. It's software limited by Ford.

Huh. So do we expect an EV to accelerate as fast from 70-100 as it does from 0-70? I don’t know. Is that what the MY Performance does?

 

[HuntingPudel]

Huh. So do we expect an EV to accelerate as fast from 70-100 as it does from 0-70? I don’t know. Is that what the MY Performance does?

No, but we don’t expect the performance model to lose 150 or more HP at ~80 mph and get smoked from a roll by its luxury counterpart. The fact is that Ford promoted the car as track-capable and we got an across the street special. With manufacturers from Korea making cars that absolutely obliterate us, it’s a bit chafing. Even the car against which Ford originally benchmarked the MME kicks our tail good. ?‍?

 

[azerik]

The real 5 second issue here isn't the 0-60. Saying we can get to 60 in 3.5 doesn't do anything for you at a roll above 60.

It's when you're on the freeway (which I am usually doing 70 in a 65 all through PHX but the rest of traffic is doing 80 and passing, or flashing, or riding my ass) already in the jailbar area for a while and need that power to get around someone. It's a crap shoot on if you'll have a couple more hp or a limp noodle when you're expecting something quick.

It's also when you're doing 75 already and that C8 Vette wants to go on 3. Fastest to 79mph doesn't win that one either.

5 seconds is a blanket term that's getting spread to the jail bars as well.
The premiums have hiden jailbars so we hardly complain or notice.

 

[21st Century Pony]

Our Premium reliably got past 108 mph four times at the Bonneville Salt Flats... it hit and held 113 mph on two of the thunder runs.

 

[Ghost Ryder]

Even with my lowly Select AWD, I have yet to find a normal driving situation where I've said to myself, "man, I wish this thing was faster."

Only shit-talk at stop lights with penis-anxious ICE drivers. That's the only time.

That's you though. We all have our Preferences. Fo

Huh. So do we expect an EV to accelerate as fast from 70-100 as it does from 0-70? I don’t know. Is that what the MY Performance does?

The MYP quarter mile trap speed is 10mph higher than the MME GT. Considering that they have essentially the same 0-60 time, you can see where the MME falls flat.

 

[Mach1E]

This is the key. It takes about five seconds to get to 72 mph and then the power starts throttling. So if you are cruising at 80 mph and want to accelerate, you can definitely feel the power throttled. The faster you go, the more it is throttled. And at some point the throttling is so bad acceleration is painfully slow, especially if going up an incline.

Personally I almost never exceed 80 mph so it has a minor impact on me. But on a road with a 80 mph speed limit and people driving 90 and 100 mph, it is a real issue. It is embarrassing.

This^^

Since the OP asked if a to explain the “5 seconds” I’ll add some more detail-

1. there is no 5 second “timer.” 5 seconds is just the amount of time it takes to go 0-72 mph.

2. you don’t “reset it,” but you can limit power more than just above 72 mph

3. things that limit power more- external temp (too hot, too cold), battery temp, battery state of charge (lower equals more limit), and discharge over time.*

*discharge over time is basically how much energy you have drained recently. The more you use, the more power you are limited by. There is a video here of someone driving hard around mountain curves and after a few minutes acceleration slowed to a literal CRAWL. Meaning floored at 60 mph, it was about 1 second per mph increase. Slower than a full size van.

 

[dtbaker61]

I've had my car for a while and I've also been around in this forum for a while where the 5 second limit constantly comes up, but I have to admit I don't understand how exactly it works and what the imposed "rules" actually are. A quick forum search also didn't help.

What I mean, is: When does the car reset the 5 second timer?
If I lift my foot off the pedal ever so slightly, does it already reset and I can go full power for another 5 seconds?
Or do I need to turn the car on and off to reset the 5 seconds?
I know for a fact that the latter isn't the case. The reality is probably somewhere in between?

the exact formula is programatic, and Ford has never disclosed the exact way it works as far as I know. It seems to be based on kW output, over *some threshold* where Ford has calculated they cannot dump heat fast enough... clamping down progressively more the longer you exceed the threshold, and then 'released' programmatically at a rate calculated to allow heat to dissipate.

Since there are no temp sensors (or chill plates) in the areas we know know to be problematic for generating heat under high current, the '5-second' clamp is purely calculated by Ford based on output and regen input current, and designed to limit potentially damaging heat to maintain confidence in the 8-yr/100k battery warranty. We are at the whim of Ford engr to change the formula, which they will only do after lots of data showing they would not be risking warranty by opening up the clamps a little.

 

[Ghost Ryder]

This^^

Since the OP asked if a to explain the “5 seconds” I’ll add some more detail-

1. there is no 5 second “timer.” 5 seconds is just the amount of time it takes to go 0-72 mph.

2. you don’t “reset it,” but you can limit power more than just above 72 mph

3. things that limit power more- external temp (too hot, too cold), battery temp, battery state of charge (lower equals more limit), and discharge over time.*

*discharge over time is basically how much energy you have drained recently. The more you use, the more power you are limited by. There is a video here of someone driving hard around mountain curves and after a few minutes acceleration slowed to a literal CRAWL. Meaning floored at 60 mph, it was about 1 second per mph increase. Slower than a full size van.

Surprise that I've never heard of this video. Would love to see it. I've seen the video on the autobahn when the GT get beaten by a wagon. Now that was embarrassing.

 

[HuntingPudel]

Surprise that I've never heard of this video. Would love to see it. I've seen the video on the autobahn when the GT get beaten by a wagon. Now that was embarrassing.

IIRC, the video was in early '22 of a '21. The driver never really got much past 70 and mostly was under 60, but repeatedly hammering it. After not too many hammer events, the car couldn't really accelerate hard due to the power over time part of the equation. Been a while since I saw it though. I could be mis-remembering. ?‍?

@Mach1E said "Slower than a full size van." My editorial: "With a worn-out, anemic 1.6l 4-banger." ??

 

[Mach1E]

Surprise that I've never heard of this video. Would love to see it. I've seen the video on the autobahn when the GT get beaten by a wagon. Now that was embarrassing.

This video is much worse unfortunately.

https://www.macheforum.com/site/thr...2023-mach-e-gt-driving-characteristics.26714/

About 30 min into the video he is literally laughing because he can keep the car completely floored while going around curves and it’s so slow it doesnt matter.

 

[Mirak]

It's also when you're doing 75 already and that C8 Vette wants to go on 3. Fastest to 79mph doesn't win that one either.

Wait… does this happen?

 

[Mirak]

This video is much worse unfortunately.

https://www.macheforum.com/site/thr...2023-mach-e-gt-driving-characteristics.26714/

About 30 min into the video he is literally laughing because he can keep the car completely floored while going around curves and it’s so slow it doesnt matter.

He’s flooring his car repeatedly up mountain roads, taking curves at high rates of speed, and he’s laughing… because he can’t kill himself or burn out his motors? This is a weird ask.

 

[Mirak]

So… with my Premium 4X, if I’m cruising at 75mph and I floor it, I get a nice little boost but it’s nothing earth shattering. Plenty sufficient to pass someone else. Are you saying you can’t do that in the GT? Weird if true.

 

[Mach1E]

Wait… does this happen?

Bring the GT500 if it does-

Sponsored