it's your transmission. accelerating from a stop is killing your fuel economy. not much you can do about it.

 

Just make sure you and/or your lawyer let them know you learned at the school of DommoPA.

 

Hi:
Sorry ... you are wrong.
No where out there is the official, actual engine dyno chart (graph) that shows the torque curve and the HP output at RPMs ....
That is why the best HP (on this car and many more stock cars) is made (calculated) at PEAK TORQUE.

You must understand that actual HP is calculated from torque .... and hopefully the PEAK TORQUE @ a given RPM is the number that is in the car mfgs. specifications.

No need to feel slighted though .... we are here for discussion and I presentinformation deeply seated in engineering and physics.

Now,MPG!? That one is still a mystery to me ...

 

Well there you have it folks

As as result of this brilliant mans findings, I have just contacted the office of Weights and Measures, they have agreed to a new measurement standard called the DommoPA Corrected Power Rating..

Everyone will be happy to know as a result every automotive manufacture has been caught in the worlds largest scam ring of false advertising, but have been shut down, there are no more cars, sorry.

Anyway it's been a good late night laugh but work is nearing and I need some sleep. Ill leave this page open for most likely some more good laughs in the morning.

 

Here are the published figures for the 2012 Z06:
Engine & Performance

• Base engine size: 7.0 L
• Cam type: Overhead valves (OHV)
• Cylinders: V8
• Valves: 16
• Torque: 470 ft-lbs. @ 4800 rpm
• Horsepower: 505 hp @ 6300 rpm

That means: the actual HP based on the reported torque is: 429.55 engine HP ...

However, I believe the 505 engine HP is probably accurate based on the torque is understated ... Those cars are "cammed" for a higher peak torque (a higher redline) based on published top speed runs.

You won't get a free 'Z06 ... sorry.



ps) I am willing to drop all of this .... 'just wanted to offer the formula for actual engine HP on a dyno.

 

omg dude please stop. or don't. this is very entertaining

 

Wait wait wait

"however i believe this is true cause the torque is understated"

Haha what? So what makes you believe the torque isn't understated on the Fit? completely throwing out your retarded argument, dude stop while you're ahead, I mean behind.

 

HP=(RPM at any part of the powerband(not peak torque RPM value))(peak torque figure) then divided by 5252

 

pretty much. OP i suggest you make another account and abandon this one

 

This thread is hilarious. I can't get past the "peak power is made at peak torque" silliness comment that keeps flying around from Dommo. Let's do a little theoretical situation thought exercise.

Say I have a modern turbocharged engine (let's say it's even a Diesel) with a wastegate on it that allows it to breathe in a way that it has a nice flat torque curve. Let's say it makes a peak of 300 lb-ft at a nice robust 2400 RPM, but that the curve is so flat that 90% of that torque level is also available over the entire range from 1800 to 3200 RPM. What kind of power is it making at each of 1800, 2400, and 3200 RPM? Is the power peak the same as the torque peak?

Answer:
93 hp @ 1800 RPM
137 hp @ 2400 RPM
165 hp @ 3400 RPM

Clearly, the highlighted one is power peak of this engine based on what I've learned previously from this thread.

Someone should really alert Honda. They've been rating their high-revving 4-bangers completely wrong for years. I shutter to think how bad the real HP rating was for an original S2000.

 

I appreciate your private message, but you fail to realize that yes hp is derived from torque, but not at the torque peak rpm. So if I have a motor that revs to 18000rpm, recent F1 motors that made 800hp give or take, depends on who was cheating or not, yet their peak torque was made at a substanially less rpm, given your formula all those producing F1 engines were flat out liars. F1 motors are not tree stump pullers and they made those high hp numbers because they can rev and rev and rev. Just like motorcycle engines, just think about that for a second as it is even more practical to the everyday person. They don't make a ton of torque really, but sure do make a decent amount of power per their capacity because why...THEY REV!!!

EDIT: I'm hoping DSM doesn't wander into this thread, he will definitely take his knowledge to another playground after reading this.

 

How the heck are you getting below 27 mpg? There are speed devils like myself that drive insane, don't regard gas and I am at a 33 average in the city. Something is terribly wrong or something...

 

Awww, I just woke up hoping I'd get some more laughs out of this, but all I got was smart people starting actual facts, darn!

Oh well, it was a riot either way.

 

Here's how you get low mileage:

1. Very short trips so most of your driving is with a cold engine.

2. Live in a hilly city with stop signs or traffic lights on every corner.

3. Step hard on the gas when accelerating from said stop signs/traffic lights.

4. Eat like an American so you're lugging your 400 lb fat ass around in the car, plus the weight of 10 huge sodas in the 10 cup holders.

 

Nope sorry BC, facts aren't allowed in this thread,

lol i love #4, you cant put big ass mcdonalds drinks in the 2 under AC cup holders though

 

I choose... entertaining.

 

Exactly. The OP's calculation is for HP at 4800 rpm. Honda Claims 117 HP, so we can calculate the Torque at 6600 rpm with the same formula:

117*5252 = 614,484. 614,484/6600 = 93.106 lb ft of torque at 6600 rpm. Honda is simply using the optimal rpm to report their figures.

As for the city mpg. Mine are awful as well. But that is because I have an 8 minute commute which includes 4 minutes of waiting for lights. No car could ever hit its stated city figures in my conditions. I'm sure that different "city" conditions could result in my car getting 30+mpg.

 

Exactly what I was just about to post. Simple high school algebra. Thanks.

 

This thread isn't funny anymore without Dommo around

 

i just hope he didn't use the same "engineering" calculations he did to get horsepower to calculate his gas mileage. otherwise 27MPG at a constant 66000rpm is pretty damn good