FGX XR6T Sprint Dyno review.

[HSE2]

How can a number of 320 for a 270 engine be right?

The answer is obviously it can't be, the numbers are rubbish. Any theories that support it are wrong, and logic that supports those theories are equally wrong.

It's a joke of epic proportions.

[2242100]

I saw on the Australian Ford Forums website ("Ford Confirm 325 & 345 kW Sprint Series" thread) that Monsta Torque apparently ran a Sprint XR8 and got 334.9 kW (@5765 rpm) on their Hub Dyno.
Photo evidence on Facebook.

[WASP]

The 270 would need to producing around 245 -250rwkw to produce 320 - 330 ish at the fly.


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[HSE2]

I saw on the Australian Ford Forums website ("Ford Confirm 325 & 345 kW Sprint Series" thread) that Monsta Torque apparently ran a Sprint XR8 and got 334.9 kW (@5765 rpm) on their Hub Dyno.
Photo evidence on Facebook.

In one of my earlier posts I make mention of this result the Sprint 8. It's basically bang on where we predict the 8'shoudl be given we are given its highest number of 400.

Less 70 is 330.

Even if you used the old 15% the number is 340.

If you say that 25% of the countries shops return numbers like this, numbers that work mathematically with what a manufacturer claims, it's very hard to then turn around and embrace numbers that make no sense.

[4Vman]

Yes exactly.

The notion that a precisely engineered specification can produce such wildly organic results way outside of reasonable tolerances is silly.

The real question marks need to be placed on the testing equipment and method for results more than +- 5%.

[FTe217]

I had seen not long after that Monster Torque quote that the next figure was with tune/cat back from memory, I really question results from tuners unless seen with my own eyes imo.

[4Vman]

I had seen not long after that Monster Torque quote that the next figure was with tune/cat back from memory, I really question results from tuners unless seen with my own eyes imo.

It was 335rwkw Stock and 400rwkw with the tune and cat back Maurie.

[FTe217]

ah thats it thanks mate.

Gawd, I tell you, I'll be battling to not do those 2 minor mods after WTY expires !

[4Vman]

ah thats it thanks mate.

Gawd, I tell you, I'll be battling to not do those 2 minor mods after WTY expires !

You don't even need the Exhaust Mod for 400rwkw.

[2242100]

The 270 would need to producing around 245 -250rwkw to produce 320 - 330 ish at the fly.


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Yes well looking at your estimated numbers, I think Wheels was thinking much the same after Herrods ran the stock FG XR6 Turbo Automatic Ute (that came from Ford) on their Dyno. I believe it was a Mainline Dyno like the unit that gave my car an almost equal 247 RWKW number.

Below is the quote (taken from Wheels 2011 article) under the heading:-

"HOW MUCH POWER?
Thanks to Herrod Motorsport for letting us put the XR6T Ute on it's dyno to see how many of the claimed 270 kW make it to the road. The common wisdom is 75%, the rest lost overcoming friction in the drivetrain. Which means the 246kW our Ute fed it's tyres would equate to 328kW at the crank. Hmm. Turbo boost was a correct 10psi, so perhaps there's truth to the to the "treat 'em mean" run-in procedure for Turbocharged Falcon sixes..."


Actually mine was ran-in pretty normally, but coming to the amount that cars lose on the Dyno's, I've spoken to a couple of Dyno Dynamics people about losses and understand that cars like mine typically lose about 50 kW and as I said the Dyno Dynamics software added 50.3 kW to my 262 RWKW and when this 50.3kW, plus the apparent slip losses are added together, I've got around a 325 kW Flywheel estimate.
But with the Mainline test there was more slip and a lower 247 kW number, but when I go through the same process (add slip loss plus 50 kW for transmission losses) I still end up with around 325-330 kW at the engine, and I should also add that my cars close to 180 km/h 1/4 mile end speeds also suggests around 325-330 kW, according to three calculators I've used (not proof but more supporting evidence, also please note the link below. An apparently brand new FG Turbo with only 50 kilometres on the clock delivers 256.3 RWKW on a Dyno Dynamics machine, I don't know how much slip was involved, but still a good number I think).

So my Mainline Dyno run total losses are in line with what you and Wheels have suggested, and the Dyno Dynamics run total losses are in line with what others have suggested on this Forum, but the important point is that both Dyno rear wheel power results point to the same engine flywheel power when Dyno Dynamic's 50 kW estimate, as well as slip losses are added to each Dyno's actual rear wheel power number.

And I believe this raises the point, that to make good sense of different chassis Dyno sheets, I think people need to first account for slip losses (unless the Dyno has the software to calculate and correct for these losses and the feature is used), because every 1% lost to slip on the rollers should cause around a 1% lower Dyno sheet number.
If a cars cutout speed is unknown, then comparing it's cutout speed unloaded on the Dyno with it's cutout speed on a power run could be one way of at least knowing the losses at the cutout revs (perhaps 3rd gear might need to be used with the Sprint Auto because of the speed limiter).

XR6 SPRINT TURBO DYNO NUMBERS
Getting back to the thread topic of Sprint dyno tests, unfortunately it doesn't seem possible to get an idea of how much slip there was on the Nizpro Dyno sheets, the rev numbers shown don't appear to me to have been taken from the engines, and I don't believe they were taken to the engine cutout point (which I believe may not have been possible in 4th gear), so just how much slip was there on this Dyno, we don't know?

But if it was around 5% (a common slip level I believe from what I've seen on Dyno sheets), then that would point to about a real 315 kW at the wheels. Now add 55 kW to that (just a bit more than my lower powered car with the same driveline) and I'm thinking we've got around the 370 kW at the Sprint's flywheel, under the test conditions on overboost.

I just wish there was some way I could accurately calculate the slip on these Nizpro Dyno sheets.


https://www.youtube.com/watch?v=WXEVy9uMF3k