Aussie S650 Mustang GT power figures - dyno run

[bfets]

Here is a video from Mustang Motorsport with the new Aussie version of an S650 GT.


Interesting comment on this video and Mustang Motorsports reply!

Doesnt look like our cars are down on power compared to the US cars at all. And with only 40-50kg weight difference between the S650 and S550, that power difference is more than enough to make up for it.

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[VB50GT]

How much difference is there in the fuel rating? I notice in some other videos from the US that they are using 87-93 octane fuel, where ours are specified for 98 octane. Is that just to keep our performance numbers up?

 

[bfets]

How much difference is there in the fuel rating? I notice in some other videos from the US that they are using 87-93 octane fuel, where ours are specified for 98 octane. Is that just to keep our performance numbers up?

There are two different measurements for Octane. One is called the Research Octane Number (RON). It's used in most of the world. The other is called the Motor Octane Number (MON). The US and Canada average the two tests. The tests are different; MON is a more sensitive test than the RON test.

So the same fuel will get a different octane number in the two tests. Because of the averaging, there's usually about a 4-6 Octane gap between US numbers and the rest of the world's numbers

 

[86RIOT]

Also isn't there changes to the header design for ADM models? For sound and epa requirements.

 

[bfets]

Also isn't there changes to the header design for ADM models? For sound and epa requirements.

It was reported that there are header differences, but maybe that doesn't affect the power as much as anticipated? Not sure. Or Ford improved our stock tune after the fact?

 

[Deano1978]

There are two different measurements for Octane. One is called the Research Octane Number (RON). It's used in most of the world. The other is called the Motor Octane Number (MON). The US and Canada average the two tests. The tests are different; MON is a more sensitive test than the RON test.

So the same fuel will get a different octane number in the two tests. Because of the averaging, there's usually about a 4-6 Octane gap between US numbers and the rest of the world's numbers

Thanks I've always been a bit confused about this. Would it be fair to say that 87 Octane in the US is equivalent to our 91 RON and 93 Octane the equivalent to our 98 RON?

 

[bfets]

Thanks I've always been a bit confused about this. Would it be fair to say that 87 Octane in the US is equivalent to our 91 RON and 93 Octane the equivalent to our 98 RON?

Probably should say "roughly equivalent", but correct yes.

Some time ago John Cadogan had a decent video on the subject.

https://autoexpert.com.au/posts/the-ultimate-guide-to-octane-ratings-the-truth

 

[MAT1955]

@bfets ..... I believe Middelton Motors in the U.S. has done a lot of Mustang dyno videos and videos of various massive engine up-grades that I found fun to watch. You might also like the video done by RSA in Florida of the 2000HP GT they built with FFRE (Fast Forward Race Engineering) who won 2023 engine builder of the year in the U.S. If interested google 2000HP coyote beats lambo. BTW they can put 2000HP on the GROUND but running at 41 lbs boost only usually uses 1750-1900 lbs? It does 0-130MPH in 3.01 seconds. He wins a lot of throw down money races.

 

[Deano1978]

Here is a video from Mustang Motorsport with the new Aussie version of an S650 GT.


Interesting comment on this video and Mustang Motorsports reply!

Doesnt look like our cars are down on power compared to the US cars at all. And with only 40-50kg weight difference between the S650 and S550, that power difference is more than enough to make up for it.

So running the maths - the S550 is rated as 339kW at the flywheel and averages 300kW at the rear wheels = about 13% loss.

S650 tested with 320kW at the rear wheels which means its making around 362kW at the flywheel (assuming same losses).

This matches the US rated figure of 362kW (486hp w/ active exhaust) not the FoA figure of 345kW.

Is this right?

 

[bfets]

So running the maths - the S550 is rated as 339kW at the flywheel and averages 300kW at the rear wheels = about 13% loss.

S650 tested with 320kW at the rear wheels which means its making around 362kW at the flywheel (assuming same losses).

This matches the US rated figure of 362kW (486hp w/ active exhaust) not the FoA figure of 345kW.

Is this right?

Yeah I mean there might be other explanations, but the only thing I can think of is that these cars are indeed underrated in Aus, and they are making more than what Ford Aus are quoting.

 

[bfets]

We will need to see as we get more data. I mean this is just one car. There are variances between different cars, but the difference between what we were expecting and what this made is big. I dont think its possible that its just a lucky powerful sample they got.

 

[Brumby5.0]

I don't reckon that Ford would play around with the programming/ equipment to give us less power here. More like they got their figures from tests that are, let's say, a little less accurate!

 

[5.0ALM]

I don't reckon that Ford would play around with the programming/ equipment to give us less power here. More like they got their figures from tests that are, let's say, a little less accurate!

I think it would be more of a case of what they have to do to meet AU specific regulations, in the cheapest possible way.

 

[DFB5.0]

Just keep in mind that there are multiple ways power figures are calculated, including SAE, DIN or ECE.

From memory, DIN numbers tend to be more conservative as they include the fitment of standard exhaust, charging and cooling systems. Ford Australia uses DIN.

These are some qoutes after some quick searching -

Horsepower (or "HP") is the unit of measurement that describes the power of engines in various machines. However, there are various types of horsepower measurements, including the DIN HP (a version of horsepower that is measurement protocol in Germany) and SAE (which is the standard definition of horsepower). While the two measurements are close, the difference is enough that it must be calculated.
How to Convert DIN HP to SAE | Sciencing

ECE R24 is a UN standard for the approval of compression ignition engine emissions, installation and measurement of engine power.[39] It is similar to DIN 70020 standard, but with different requirements for connecting an engine's fan during testing causing it to absorb less power from the engine.
Horsepower - Wikipedia

DIN 70020 is a German DIN standard for measuring road vehicle horsepower. DIN hp is measured at the engine's output shaft as a form of metric horsepower rather than mechanical horsepower. Similar to SAE net power rating, and unlike SAE gross power, DIN testing measures the engine as installed in the vehicle, with cooling system, charging system and stock exhaust system all connected. DIN hp is often abbreviated as "PS", derived from the German word Pferdestärke (literally, "horsepower").
Horsepower - Wikipedia

 

[Bullit]

I hope the same for EUR specs.

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