Blown away by ICE GT Fastback

[HuntingPudel]

Isn’t that two speed more about efficiency and top speed than higher speed acceleration?

For this rolling race (which would be in 2nd gear for the Porsche/Audi) I don’t think it wouldn’t really help.

The two speed transmission also allows the Porsche to have a higher terminal velocity. Our MME GTs have more than enough power to go much faster than they are able to. They are limited by gearing because the electric motors cannot go at any higher of an RPM. ??

Sponsored

 

[MatchaGT]

I got revenge for you lol

 

[MacherAWD]

Ah! I’ll bet that’s also a lot of it. I’ve been assuming torque would be pretty constant across the operating range (like most electric motors). If it has a drop off, that, coupled with all the other losses in the system, answers my question.
Of course, now I’ll be pushing for a flatter torque curve across a wider operating range, along with restoring my beloved frunk ???

Before I get strung up on here, I googled the MME GT torque curve and went by a realistic image. I did no additional validation or fact checking, but that image showed 700 from 0 to 3500 then it drops almost at 45degree angle, but HP rises in that span so you start to feel that kick in.

 

[GreaseMonkey]

I got revenge for you lol

And that was with a/s tires if I remember correctly.

 

[MatchaGT]

And that was with a/s tires if I remember correctly.

You are correct! Still ripped a 1.73 60ft lol
Traction off

 

[GreaseMonkey]

You are correct! Still ripped a 1.73 60ft lol
Traction off

Do you have any figures for 1/4 mile with continentals? We know the Pirellis should get 11.8.

 

[Ahlarict]

Before I got strung up on here, I googled the MME GT torque curve and went by a realistic image. I did no additional validation or fact checking, but that image showed 700 from 0 to 3500 then it drops almost at 45degree angle, but HP rises in that span so you start to feel that kick in.

There's a clear sweet spot for both torque and HP - it's just not as dramatic as an ICE power curve, so the benefits of a transmission are reduced, not eliminated

 

[MatchaGT]

Do you have any figures for 1/4 mile with continentals? We know the Pirellis should get 11.8.

I don't, but I ran a 7.53 in the 1/8 mile which converts to a 11.83 1/4 on the online calculator. The track prep was great though so I don't think the summer tires would make much difference. There is another member on here with the continentals that did run 11.8 at 113ish. His video is on YouTube.

 

[Mach1E]

Ah! I’ll bet that’s also a lot of it. I’ve been assuming torque would be pretty constant across the operating range (like most electric motors). If it has a drop off, that, coupled with all the other losses in the system, answers my question.
Of course, now I’ll be pushing for a flatter torque curve across a wider operating range, along with restoring my beloved frunk ???

Our torque curve is not even remotely close to constant. There is a HUGE drop off starting at 30 mph.

You can tell based on our peak hp numbers.

HP= tq x rpm/5252.

If our tq curve was flat, we would have over 1400 peak hp!

If it was even flat to 5252 rpm (around 50 mph) we would have 700 hp.

Unfortunately we don’t.

 

[Mach1E]

Thanks! But the moving parts resistance should be significantly less, simply because there are fewer moving parts (the rotor in the motor, the reduction gearing, and whatever gearing is necessary to get to the wheels). There aren’t the thousands of bits and pieces flying around that there are in an ICE?

You’re ignoring the main moving parts- the wheels and tires.

Those also increase resistance exponentially as speeds increase.

The moving parts we don’t have (inside a gasoline engine) aren’t creating resistance, they’re creating the power.

 

[Jimrpa]

There's a clear sweet spot for both torque and HP - it's just not as dramatic as an ICE power curve, so the benefits of a transmission are reduced, not eliminated

So, if I understand the graph properly, my assumption was correct. Both HP and torque are constant across the main operating range of the motor(s)?

 

[Ahlarict]

So, if I understand the graph properly, my assumption was correct. Both HP and torque are constant across the main operating range of the motor(s)?

Not quite - Torque is constant from 0-3800rpm or so (top line) after which it plummets rapidly, while HP rises until around that same point and then stays flat until rev limit. (The two swoopier bluish lines are the Dark Horse)

 

[Mach1E]

Not quite - Torque is constant from 0-3800rpm or so (top line) after which it plummets rapidly, while HP rises until around that same point and then stays flat until rev limit. (The two swoopier bluish lines are the Dark Horse)

Yes, but that’s just a chart based on peak power numbers, not an actual Dyno graph.

We wish our hp stayed at the peak 480 number. In reality, it likely drops off much more than that chart shows.

Unfortunately no one has posted an actual Dyno of a GT and I think only one person has ever dynoed a premium 4x back in 2021.

 

[Ahlarict]

Yes, but that’s just a chart based on peak power numbers, not an actual Dyno graph.

We wish our hp stayed at the peak 480 number. In reality, it likely drops off much more than that chart shows.

Unfortunately no one has posted an actual Dyno of a GT and I think only one person has ever dynoed a premium 4x back in 2021.

Ah, that makes more sense

 

[Jimrpa]

Yes, but that’s just a chart based on peak power numbers, not an actual Dyno graph.

We wish our hp stayed at the peak 480 number. In reality, it likely drops off much more than that chart shows.

Unfortunately no one has posted an actual Dyno of a GT and I think only one person has ever dynoed a premium 4x back in 2021.

Ok, I’m confused again (sorry). I must not be reading the graph correctly. For example, it looks to me that the graph is saying that, at 3500 RPM, the Mustang Mach E produces 475 ft-lb of torque and 475 HP, at at 8000 RPM, the Mustang Mach E is also producing 475 ft-lb of torque and 475 HP?

Sponsored