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what reduces the performance of our euro Mustangs?

Michael_vroomvroom

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I'm curious, what are the changes done to our euro Mustangs that reduce the HP, relative to the US ones?
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DonnieO

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Headers and some emissions laws
 

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+ GPF’s

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Vlad Soare

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It must be the GPF.
What I find a bit puzzling is that the GPF affects the Bullitt more than the GT. The GT loses 10 HP, while the Bullitt loses 20. Why is that?
 

WD Pro

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And even with the GPF the 2018’s+ take less of a HP hit compared to the American offering then what the 2015-2018 does.

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cib24

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The shit headers and the extra restriction from the cat/GPF.

The export Mustang headers have runners that are 10mm smaller than the US headers. A hack job way to ensure the headers clear the steering rack on RHD models, but due to EU spec rules Ford puts the RHD headers on EU LHD Mustangs as well so they don't need separate approvals.

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cib24

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Here is an image that shows the difference. The 10mm diameter shrinkage is on both the left and right banks for export Mustangs to Europe, the UK, Aus and NZ, and I believe other markets as well.

53a2a795-2dd8-43b9-9bea-3560a93bd70e.jpg
 

Ace

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One thing that is barely mentioned in discussions like this are different fuel standards. For US horsepower measurement the carmakers can use the fuel they want. Ford always relies on US premium fuel, that's why their horsepower numbers always have the * symbol next to it with a disclaimer that it's measured with 93 octane fuel.

Before I go further, you have to understand that octane is USA is not the the same octane we talk about in Europe. Europe uses ROZ as their standard, USA has AON = (ROZ+MOZ)/2 as their octane standard. So AON93 is pretty much the ROZ98 fuel.

But European cars are bound to use the ROZ95 for horsepower numbers because the WLTP standard requires. Since the Coyote and the Ecoboost engine in the Mustang both can use premium fuel (which means the better the fuel the more horsepower you get, so you lose power with fuel below ROZ98) the Mustang in Europe has less power on paper, but if you put ROZ98 in your car, the difference is way smaller.

To me it's much more important that ford is not using the performance rear axle ratio for manuals, which makes the MTs painfully slower than they should be, and overall some gear ratios are downright stupid (I think 15-17 GTs have to go above 210kph in the 6th overdrive gear, and refresh GTs reach vmax in 4th gear with two overdrive gears)
 

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That's interesting info and very topical, I had been looking into this for my own interest. Here's where I was up to :

S550-Mustang-HP-UK-v-US.jpg


I would be interested to know on a UK car what sort of power increase is possible with the jump from 95 RON to 99 RON and also why the gen 3 torque discrepancy seems to be really out of line ... ? :inspect:

Any further info appreciated :like:

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I know its not a directly proportional relationship, but the fanimould didn't hit the torque numbers of the 15-18 as much as the 18+ ?

And proportionally even with the GPF on the 18+, the HP numbers are much closer to the US numbers than the 15-18 model ?

Wouldn't surprise me with Ford if it's a printing error ... :cwl:

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cib24

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That's interesting info and very topical, I had been looking into this for my own interest. Here's where I was up to :

S550-Mustang-HP-UK-v-US.jpg


I would be interested to know on a UK car what sort of power increase is possible with the jump from 95 RON to 99 RON and also why the gen 3 torque discrepancy seems to be really out of line ... ? :inspect:

Any further info appreciated :like:

WD :like:
Good point about the octane. I've logged the ignition timing advance with 99 and 95 fuel and 99 allows up to 23-26 degrees advance on my 2019 GT while 95 only ever offers 18-21 degrees of spark advance.

Naturally, that should be a decent hp and torque difference.
 

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Now that’s a question I may ask on the open forum “how much power is 5 deg of timing worth on a gen 3 coyote ?”

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cib24

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Now that’s a question I may ask on the open forum “how much power is 5 deg of timing worth on a gen 3 coyote ?”

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Hard to say. The timing is variable throughout the RPM range and depending on gearing and heat, etc.

Brief example where you can watch the timing while I drive around Brands Hatch and pass most things.

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