That does make sense.

I loved your article on www.vtec.net and can't wait for the handling part.'

There's nothing like real data for evaluating a difference.

The second piece is the part you alluded to, running the two S2000s against each other.

 

I wonder what the ambient air temperature was during this dyno comparison??
Those of us with pre-2004 S2000's know that the engine management becomes very conservative as the air temperature goes up. With the significantly lower redline the MY 2004 might get away with much different mapping.
On warm days in traffic my MY 2001 loses a lot of power; be interesting to see if MY 2004's show the same behavior.

 

Undoubtly the new MY04 should and will make more HP and torque but by 26HP more? Thats what I have a hard time believing...

 

Why would Ferrari build a 30 thousand dollar car, and why are you comparing your 30 thousand dollar Honda to a Ferrari?

You named only one reason, not a few, and even at that Honda does not have the highest resale in all categories, or off the top of my head any for that matter. Moreover, what does resale have to do with technology or Ferrari?

Ah, well you did not state that earlier.

While I realize that statement is probably tongue in cheek, you know someone will take that as fact and not speculation.

 

[QUOTE]Originally posted by Hyper-X
I look at published numbers as a reference to go by, not as the absolute performance level.

Automakers can claim any HP figure since there's no law mandating a 3rd party to check out their claims.

 

I'd expect a HP bump since the displacement was bumped. The Dyno day we had a currey's a couple of years ago produced a 10 HP range between between all the stock S2000's that ran that day. I wonder if the dyno guy accounted for the new gearing in the tests.

 

Jesus christ. When will this end?

The '04 S2000 makes more power and torque than the '01 to '03 S2000. The power is more usable also. End of story. Get over it already.

 

Wrong. One 04 made more horsepower than one 03.

It's a damn good thing I did not stay in the scientific field.

 

[QUOTE]Originally posted by 'smyroad
I'd expect a HP bump since the displacement was bumped.

 

Accuracy, in the case of a chassis dyno trying to ascertain engine numbers, is not very meaningful. What is important is repeatability and consistency (precision officially). The Dynapack is guaranteed by its manufacturers to be repeatable to +/- 0.3%. In repeated tests that I've done on the same car (for an oil company), I usually see standard deviations in the data that amount to about 0.5% of the mean. Given that I can't control environmental conditions absolutely (or measure everything I want to on the car to ensure complete consistency), I think Dynapack's claims are appropriate.

The sample pool of stock pre-04's must be divided into the 00-01 and 02-03 groups as they are distinctly different. In terms of output, their ranges just barely overlap. IOW, the best 00-01 (stock) that I've tested made about as much power as the worst 02-03 that I've tested. I never bothered to run a full analysis (I only do that when I get paid as I have to export the data and run it through some excel files), but as I said, the average for the late models is 5 hp higher than the early models. And given that the extremes of the two sample groups don't overlap you can make a rough estimate of StdDev (it'll be about 1 to 2). That could put the average of the 00-01 group just within 3 StdDev of the average for the 02-03 group, but it also means that a substantial number of the 00-01 group would fall outside the range. You could combine the two groups together, but as I said, there are distinct changes between the model years, including an ECU part number change and datalogged timing changes that make this unwise.

The TCF factor is a user entered factor to provide an estimate of flywheel hp. There is no mystery, especially as it is placed in direct view for everyone to see so that results can not be improperly manipulated.

smyroad, gearing changes were accounted for, although that would _not_ change the hp numbers, only the torque numbers and calculated rpm. In your dyno day, was everyone running the same wheels/tires, with the same tread depth and inflation pressure and was each test made at the same intake temp (differential relative to ambient) and coolant temp? If not, you've introduced some significant variables into the measured output of the vehicles.

UL