Aussie S650 Mustang GT power figures - dyno run

[NegativeMultiplier]

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.

320kw = ~429.127 Metric HP, / 98% to convert to Imperial HP = ~437.88 brake horsepower.

Divide by 486, since this particular car has active exhaust, and that's only a ~10.1% loss in power through the drivetrain. Impressive.

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[robvas]

320kw = ~429.127 Metric HP, / 98% to convert to Imperial HP = ~437.88 brake horsepower.

Divide by 486, since this particular car has active exhaust, and that's only a ~10.1% loss in power through the drivetrain. Impressive.

Taking the rear wheels off adds some power ;)

 

[NegativeMultiplier]

Taking the rear wheels off adds some power ;)

I don't want to pretend like I know what the exact losses are per component, but I'd like to imagine removing the wheels probably doesn't have a huge effect? Maybe 3% difference, I'd guess.

Either way, I still think the numbers are much higher than what was stated, so overall positive.

 

[robvas]

I don't want to pretend like I know what the exact losses are per component, but I'd like to imagine removing the wheels probably doesn't have a huge effect? Maybe 3% difference, I'd guess.

Either way, I still think the numbers are much higher than what was stated, so overall positive.

you can gain power just by going to a lighter wheel/tire combo. So imagine subtracting the full 100+lbs that a set of stock rear wheels and tires weight?





again, it's just a dyno number which doesn't mean much and you can't really compare a hub dyno to a dynojet. Would like to see what other cars make on that dyno for a real comparison.

 

[bfets]

again, it's just a dyno number which doesn't mean much and you can't really compare a hub dyno to a dynojet. Would like to see what other cars make on that dyno for a real comparison.

It is true that a hub dyno typically reads higher than a roller dyno. In this scenario, we do know what other cars make on that same dyno. See Mustang Motorsports comment on the video. The old S550's typically made 300kw on the same dyno where the new S650 makes 320kw. So for the S650 to make 20kw more than your typical Australian S550 on the same dyno is very positive for S650 owners.

 

[Radiant]

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

Yeah, fueling gets weird in modern engines. For example, the Ecoboost loves ethanol, just absolutely wants E10+ all day long. The octane, the beneficial cooling from heat of vaporization, everything about ethanol blends makes the engine happier.

But yeah, AU 98 is US 93 is honestly close enough.

 

[Dave2013M3]

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?

98 Ron is 93 Octane in the US

 

[Stevefreestyle]

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 -

Both US and Aust are DIN

 

[Stevefreestyle]

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?

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?

Fantastic Result !! 300 kw from 339Kw Flywheel is closer to 11% parasitic loss - which is very low and efficient, as the average is closer to 15%.

But assuming 13% with 320 RWKw should give approximately 368 Kw (Flywheel), when you deduct 13% back from 368.

 

[N1T3MRE]

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?

The header thing got the better of me, and have had a look - will try and get a pic on Wednesday (at work atm), but they have cut and pasted the DS header pretty severely (passenger side is a little hard to see clearly)........ about 100-200mm from the block the tubing size decreases by about a 1/3 for about 200mm, then goes back to the original size.........assuming it is all for ADR purposes as there is plenty of room to replace with a 1"7/8 Cookes system. Not sure what this would do to our warranty though??

Not a guru in this area - but in the gokart racing days, a small change in header/exhaust spacers lengths made a huge difference in engine performance.

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