What is a STOCK 370Z with MT actually putting down?
 

I have seen RWHP postings ranging from 260 all the way up to 282 for STOCK 370Z's with MT's. It is hard for me to accept that there is this much RWHP latitude between 370Z''s with MT's. What is this car actually putting down in a pure "off-the-lot" STOCK configuration??

Man this thread can go on forever. This will definately start the "which dyno is the most accurate" thread. Some dynos run low, some run high. I would just take that median number and call that the closest truth. So if some are as low as 260 and as high as 282 hp. I would say 271 is the median true rwhp on the Z. Wat you really need is torque anyway. Without torque hp can only do so much. I wish nissan designed this car to be more like 332hp 300lbs torque. If its a beast now? Imagine with 30 lbs more torque. Lol. CRAZY!

Unknown is correct, it is all dyno based because they all measure things differently, and after that you have variables of temperature, humidity, altitude, etc.

Depends on the dyno. :)

I think I dyno'd 259 stock on a Dyno Dynamics (which read low compared to something like a Dyno Jet).

Dynos are like body fat calipers IMHO. They will only get you close to a true reading.

4500 on a good day.

*sigh*

+1

The biggest numbers I got (last Tuesday) were 296.90HP and 380.73TQ on different runs. :stirthepot:

you're not suppose to post your real faux numbers on this tread.

:facepalm:

What?! That's a scan of the actual printout! Numbers don't lie.

If nissan designed this same engine to only rev 6000rpm or make its peak power at 6000 rpm then you would have that much tq. You can't have high revs and high tq at the same time. There is a constant number in a HP vs TQ formula which applies to every engine in the world. That number is based on physics that can not be changed.

Laws were meant to be broken.

Including the laws of physics.

This is a point that can not be overstated.

I mean...since HP is a calculation based on torque...so without torque, you have no HP, therefore it can only do so much (nothing...)


:facepalm:

lets do it...

+1 those are your variables, end of story.

I knew it! Unicorn blood! :rofl2:

:facepalm:

Subscribing for inevitable drama.

What you are saying sounds like an educated answer. And its believable the way you are explaining it. But I would like some proof of that statement. Do you have a link or something I can read from. I'm not saying you are wrong. I would just like to learn from this theory.

HP = (TQ*RPM)/5252

If you plug this formula to any dyno graph out there you will see how how RPMs, TQ, and HP matches up. The HP power curve is what determines the TQ of the engine and vice versa.

Put some Force Induction into the mix and everything get's screwed up though

How can hp exist with out torque?

Got that right!

Nope.... tried the formula on the 335 dyno and every single RPM was spot on.

Look at motorcycles - their redline is ridiculous because they are a "larger" bore with a shorter stroke. That allows them to rev high without too much fear of parts flying everywhere. Unfortunately, this results in a loss of torque. Now I don't know the SPECIFICS, but I don't doubt it has something to do with less mass/overall piston speed flying around.

On the other hand, most domestic V8's go with a mix of a good bore and a good stroke to get an ideal combination of power and torque. The downside being, you cant exactly spin it up to a crazy-high redline. Again, probably due to just the sheer mass of internal parts flying around at amazing speeds and the risk of valves floating into the piston heads. A common mod for many F-body guys who want a high-revving motor is to actually de-stroke it. Less cubes overall, but the higher redline can be worth it...

Most diesels in trucks are inline 6's with a medium size bore, but huge stroke. Low-*** redline, but man the torque is ricockulous.

By the way, worthy of note - once you're up to speed and in your ideal RPM range making peak power, your torque does not mean nearly as much as it does, say, off the line on a launch. So, put two theoretical cars with the same exact size/weight/aerodynamics with 2 drastically different motors that, somehow, magically make the same exact horsepower against each other. Lets say one has a low-revving, 330 HP/330 Torque V8. The other is a higher revving 330 HP/250 torque V6 (boy, I wonder what motors Im comparing here...). Assuming both are driving near each other on a course and its...say, like NASCAR where they are running at their peak power most of the time...they should theoretically be able to compete with each other just fine.

Now, of course, this all goes out the window as soon as corners, braking zones, and the need for a lot of shifting happens. But, of course, this is why no two cars are the same, right?





****, this isnt a typical MightyBobo post.................douchebags. There, I feel better.

We can fly can't we? :D

Ever wonder why a 3500 lb mustang with 315 HP can accelerate almost ecactly the same as a 370Z under 3300 with 332 hp?

torque

good primer for those interested....

http://www.vettenet.org/torquehp.html

THE ONLY way to measure that properly is to either have EVERYONE in the world use the same dyno... or have everyone always measure it at the crank and trust what nissan says. Come on dude... there isnt that much latitude between the hps - the latitude exists between the dynos

That looks like a Subaru tq / hp run :) am i right?

not necessarily. Gearing plays a big roll.. Tq is the measure of rotational force on something.. There can be Tq with no movement for example you can push on a building and not move it but your still applying TQ, Without HP there is no movement.. Hp is the measure of work being done over distance and time. The more work being done the faster your car will get down the track. All things equal, Weight, Gearing etc.. The car with more hp will get down the track quicker.In essence hp is what really matters. It all depends on what the vehicle is being used for.

Nope, that's my Nismo, bone stock.

The point he was making Shab, is that the dyno got a bad read - proving that a dyno is NOT a reliable indicator of power at all.

True, I was assuming "all other things being equal". :D

The operator had issues getting a good tach read, so my TQ curve over 5250 had spikes. I actually got just over 248TQ.

http://www.the370z.com/attachment.ph...1&d=1273253746

+1. That quote that says TQ wins races is such a BS that is still has validity for some people. :rolleyes:

iagree:
The fact that the TQ curve always starts its drop at 5250 RPM's and the engine will be entering into the upper RPM range needed to make its max power ought to be the clue to the TQ lovers that HP is the final force that is in dire need of being present to accelerate the car the remaining distance it is from the finish line as the torque curve begins to drop. At his point the importance of torque is a dimished return in getting to the finish point.

Torque does win races... Two engines with the same horsepower, one of which producing it at lower RPM value (such as a mercedes or something), would be producing more torque over basically the entire RPM range. Even two cars weighing the same, same gearing, etc... the one with more torque will pull in front!!

That example that you are talking about is true on the initial acceleration of the car. TQ will allow you to accelerate faster in short period of time (redline is lower). HP will keep you accelerating longer with less force. A car that makes its peak tq from 2000-5500 RPM such as my old 335, had great acceleration at any given RPM but peak power came around 6000rpm even though it redlined at 7k. It was great on low speed races but it was not once you stay get to speeds (higher rev range). The perfect example is the AMG cars VS M5. AMG cars are faster at lower speeds but the M5 smokes most of them anything over 120mph. Why? Because it accelerates for longer period of time with its higher redline. Same example can be used with s2k vs other cars that had twice the tq such as the z33 also ferraris vs lambos. Every manufacturer has its own way of building an engine, its just a matter preference what you are into. Me higher redline and higher peak hp > than bunch of tq and lower rpm peak power.

Both are very important and depend on each other. The thing that will not change is that higher RPM peak power = less tq and vice versa. Again TQ wins races is not an accurate statement.

Regardless of if it has more HP or torque, a certain weight requires a constant force to achieve a certain acceleration. The amount of force required to achieve a certain acceleration is a value bound by the laws of physics, and regardless of how much HP or torque the engine is outputting doesn't matter in achieving that. If you want your car to run 11's or 10's or whatever, that requires a certain amount of torque at any engine speed you want to produce the amount of power necessary to propel that vehicle at that rate...

I'm unsure of how either TQ or HP would win a race since HP is a value obtained by calculation of TQ and engine speed. If you have the opportunity of having your engine stretch out the same torque curve over a higher RPM range, then of course you would since it would be producing more HP at the same torque values. So in closing, what argument is it? It's not a battle between HP and TQ, but rather, how highly you can produce that Torque #