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As of yesterday I'm on my 3rd Challenger. First was a 2010 R/T, second a 2015 R/T Plus and now a 2018 SRT. Question...Why does the dodge.com website refer to the 392 Horsepower as "485 Estimated?"
 

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Because it's not accurate.

and they don't want to be sued for miss stating the HP.

The "estimated" leaves them an out.
 

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Interesting that the "Estimated" notation does not appear on all references to the 392. Back in the day Ford, GM and MOPAR routinely published HP ratings were grossly underreported for a variety of reasons. Obviously being new to the SRT world, are there questions as to the HP/torque ratings on the 392?
 

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My guess would be the engines are rated for somewhere close to sea level. I'm at a mile high and certainly do not come close to 485 horses. Damn, I'm going sue them for getting an under powered engine LOL.
 

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They are supposed to target a standard condition to rate horsepower with the society of automotive engineers(SAE) and I believe in the current standard, a density altitude of 1100 or 1400 is used. So it will make close to 500 at sea level, and less of course for us up here in the mountains. The DA in the summer here is 7-9k depending on the time of day, but my 392 will still perform pretty damn well I must say! :)
 

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Back in the day some OEM's rated their HP numbers at a reduced rpm, like 5,000. That same engine at red line produced a lot more power. Thus the term 'underrated' was born.
 

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Doesn't the 392 make about 420-430hp at the rear wheels? With the normal driveline loss that puts it right at the rated 485hp.




Sent from my SM-N920T using Tapatalk
 

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Guys would greatly appreciate your thoughts and feedback on this. When you have your performance pages up and you have the engine metrics being displayed, have you ever seen your car reach its max hp of 485?? I haven't in mine. If I take it out and redline it rowing it through 1-3 (manual shifter), I don't see it getting over like 410 hp. And with all the mods the car has you would think it would be doing that at a bare minimum! Does your car hit its max hp of 485??

Going to be taking it to a dyno shop by me to be looked at - not sure if its the tune or what but I've even noticed a bit of lag or bogg that I just don't think should be there for the amount of hp the car has.

Appreciate your feedback on this!
 

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Guys would greatly appreciate your thoughts and feedback on this. When you have your performance pages up and you have the engine metrics being displayed, have you ever seen your car reach its max hp of 485?? I haven't in mine. If I take it out and redline it rowing it through 1-3 (manual shifter), I don't see it getting over like 410 hp. And with all the mods the car has you would think it would be doing that at a bare minimum! Does your car hit its max hp of 485??

Going to be taking it to a dyno shop by me to be looked at - not sure if its the tune or what but I've even noticed a bit of lag or bogg that I just don't think should be there for the amount of hp the car has.

Appreciate your feedback on this!
Keep in mind that the in-car display shows numbers at the wheels. That's what it takes to accelerate your car with you in it at that place in time under current weather conditions. The 485hp rating is SAE net engine hp not hp at the wheels. It takes power to turn everything in the drivetrain so by the time you measure power at the wheels, its quite a bit less than what the engine puts out. 410whp is probably pretty close to 485 engine hp. If you think you should have more power than stock because you've done mods, the rest of the difference you're seeing could just be poor weather conditions.
 

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Keep in mind that the in-car display shows numbers at the wheels. That's what it takes to accelerate your car with you in it at that place in time under current weather conditions. The 485hp rating is SAE net engine hp not hp at the wheels. It takes power to turn everything in the drivetrain so by the time you measure power at the wheels, its quite a bit less than what the engine puts out. 410whp is probably pretty close to 485 engine hp. If you think you should have more power than stock because you've done mods, the rest of the difference you're seeing could just be poor weather conditions.
Wow. I guess mine has 505 at the wheels then. Or at least it did last winter.
Car is bone stock with a hellcat airbox and element.
 

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No, it's displaying engine power, not at the wheels like a dyno.

For Clevetown, keep us posted, with mods like that obviously the tune is critical. Not claiming to know anything groundbreaking here, but a local guy installed a 274 in his 392 and it just never tuned right and it faught him the whole time...and he blew up his motor after about 6 months. The 270 was deemed a more tunable cam, apparently the 274 is just too big? I dunno, but good luck!
 

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No, it's displaying engine power, not at the wheels like a dyno.

For Clevetown, keep us posted, with mods like that obviously the tune is critical. Not claiming to know anything groundbreaking here, but a local guy installed a 274 in his 392 and it just never tuned right and it faught him the whole time...and he blew up his motor after about 6 months. The 270 was deemed a more tunable cam, apparently the 274 is just too big? I dunno, but good luck!
I'll keep you posted - as mentioned, taking it to the dyno shop and go from there. Thanks for the comment.
 

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Keep in mind that the in-car display shows numbers at the wheels. That's what it takes to accelerate your car with you in it at that place in time under current weather conditions. The 485hp rating is SAE net engine hp not hp at the wheels. It takes power to turn everything in the drivetrain so by the time you measure power at the wheels, its quite a bit less than what the engine puts out. 410whp is probably pretty close to 485 engine hp. If you think you should have more power than stock because you've done mods, the rest of the difference you're seeing could just be poor weather conditions.
Yea understand that - just seems with the mods done on it - it should be producing more! Let you all know when I find out. Thanks.
 

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OR its because of the different intake setups on the cars. Shaker, vs non shaker, vs T/A, vs SRT They probably all have a different effect on HP you make. I think going by what the Uconnect says you are making is NOT a good idea. Its slow to react and its more of a gee wiz toy, vs an accurate measurement of HP.


Just my opinion
 

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Back in the day some OEM's rated their HP numbers at a reduced rpm, like 5,000. That same engine at red line produced a lot more power. Thus the term 'underrated' was born.
That's exactly what Plymouth did with the high-winding 340 engine. The 1971 engine was rated at 275 hp. but the NHRA wasn't fooled and factored it up to 325 hp. Plymouth published horsepower readings at 5,000 rpm instead of 6,000 rpm.
 

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That HP and TQ number on the dash is calculated based on fixed parameters that you have now changed if the car is tuned, and especially if it has different injectors or map sensor.
Basically it means little to nothing, especially once you start playing with mods.
 

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I dig up this topic.

Do you know what are the regular conditions to obtain this 485 HP with the scat Pack about temperature, pressure, octane rating ?
About the inboard dyno, as said previously, I understand it is based on calculation about load and RPM.
So it should stay the same, no matter the engine is in a good or poor condition.

I try last time at the sun rise, 14°C outside air temp, 20° C intake temp, 500 ft of pressure altitude, I get 439 HP with the reset of ECU and stock engine and 91 octane fuel.

I know it's a gadget but it's a little bit frustrating. It could be fun to compare results with a real dyno on the same test.
 
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