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Discussion in '2020+ Shelby GT500 Mustang' started by D'ZR1 Messiah, Jun 19, 2019.
This car is going to be epic! Congratulations to those of you that decided to bring one home.
I only heard it once. Did an engineer say 760 to the wheels?
I agree with GTS, parasitic loss is generally more that 50hp at these power levels.
I also want to mention certified power should have some allowance for engine builds. Not one will have eve the exact power output. But they all should have at least 760hp crank.
Also 760rwhp/.85 is 890+Crank hp. No way the gt500 has this much power oem. Generally auto it’s closer to an 18-20% loss. I see this car putting down 630-670rwhp.
I'm betting it puts between 690 and 700 to the tire. This isn't a torque converter auto.
What loss %? 12 or 15%
I'm betting it's only going to be between 8 and 10 percent.
It probably eats up as an entire system, 45-55tq at 7500rpm to move the car.
I think it’ll dyno 700-715whp 90% or the time, wit. 680-730whp being the wide range with outliers
Assuming Ford is telling the truth on the 760 number, most cars will dyno under 700.. around 685-690. Heros will baaaaaaaaaaaaaaaarely break 700.
Just like most 13/14 cars dyno 580-595 with the heros barely cracking 600.
No chance. PDK is at least 12 but more likely above 15%. 991.1 GT3 PDK at 400whp is a 16% loss.
You think crank is going to closer to 800hp? 700rwhp at 12% is 795hp. Kaneda would pull throw his toys away...
Are those porsche's AWD?
No , GT3 P cars are RWD . I think P cars heaving rear mounted engine without driveshaft will show less drivetrain loss then front engine cars
Any time a drive shaft is involved it will yeild more loss, how do I know? My highly scientific data of my impact gun having much less torque when using an extension lol. Cant really find a real straight answer on the google.
Correct, which is why settings on your torque settings on your torque wrench should be different when using extensions.
Gearing, maybe? It's said that shorter gearing will yield smaller dyno numbers. I don't know why that is.
Everything should be measured in 1:1 ratio.
Possibly. Personally, I think trying to reverse engineer crank horsepower is pretty worthless. I think a lot of us are probably guilty of looking at a dyno number and weight and estimating a trap speed, and maybe a potential quarter mile, but trying to calculate the crank horsepower seems meaningless. Saying the engine makes 860, but the supercharger "costing" 100hp is stupid, because it would not make "860" without the supercharger. Net, it is rated at 760, and will likely dyno in the high 600s. That is the number that matters for straight line guys. It sure would be nice to have the weight...but I am sure that is not out there because it is probably not flattering. Not a concern for me personally, I am more turned off at the ADM stuff at the moment, vs picking up a ZLE and modding, because I would mod this anyways.
The problem is that we have bad info out there. One guy says 760 to the tire and an engineer says 850 before you take out the power the blower uses people are going to think it’s more power than actual numbers. When Dyno start showing below 650 people will be pissed even though that’s what’s expected with auto trans power loss.
To specifically mislead the public is wrong.
All I gotta say is,......doesn't matter how much this car makes on the dyno.
IT'S PRETTY FAST if it does 0-100-0 in 10.6 seconds!!
12psi in a modern 7500rpm coyote 5.2 with 9.5/1 and very capable heads is going to make more than 474hp. I’m guessing about 485hp na at a minimum.
12/14.7= .816, then add 1 to account for the na engine.
If we use 485*1.816, we get 880hp.
Take away 110hp to run the blower and we have 770hp. I assume it will eat up about the same torque to turn 7500rpm as the 10a gt auto does. That would be about 40tq to represent about 57hp.
770hp-57= 713whp. I’m assuming net hp with alternator and water pump etc from the get go.
The average 03 cobra’s made 360-370whp. They spanned 350-387whp from what I recall.
I think we’ll see 675-725whp for gt500’s with outliers, and 700-715 most of the time.
(Quick afternote: Let’s also point out the 5.2 voodoo with less flowing heads makes 526hp. Let’s say the gt500 heads helped it make 1.5% more peak hp but less torque midrange (ie why they weren’t used) with 12/1 cr. That would mean 534hp. Take off 3% cr 12/1 to 11/1, 3.5% 11/1-10/1, and lastly 2% 10/1-9.5/1= and we get 491hp... 12/1 vs 9.5/1 compression accounted for, and heads assumed to only be worth a whopping 8hp on a gt350 5.2)
491*1.816=891hp. Take even 110hp to drive the blower and you still get 781hp.
Math is fun, but I’ll have mine at a safe 15-16psi and 800rwhp with a free flowing exhaust and E85