SteveUCI

One thing that comes to mind here while we're talking about S2K's expected rear-wheel output is this:

I have heard that the S2K's motor goes from 219hp when new to 246hp when fully broken in after 10000 km. Anyone dyno their S2K after the 10000km mark? Let's look at those #'s for the real comparisons....

2x6spds

AutoEx, good points. But, I'll bet you'd really love another 15 HP! Anyway, maybe BMW underrated their little sports slug (looks like a slug, goes like stink). OK, so you think it's graceless to push Honda for 15 more HP, if they overrated these engines. Boy, 15 warrantied HP would make me dance with joy.

Just my 2 pfennigs

2x6spds

Mindcore

Sorry if I missed it somewhere above, But the lack of horsepower on the Miata was at the crank, not at the wheels. This negates the driveline differences. They say our cars are 240 hp..AT the flywheel. This may be the case, I don't know if anyone has measured this. Now if it was 8% less the specified 221 hp then I think Honda would have a problem. I think the line gets a little blurry as you move down the drivetrain.

Red_s2k

the other point (or question...) is how many of the low 190 hp dyno plots were during the summer when we have found that hot temps really affect the car??

I personally think if I can hang with an unmodded ls1 f_body in 3rd and 4th... the car has plenty of power!

also it seems to me I remember the 99' 10th AE Miata with 6sp was .5 to 1 sec quicker 0-60 than the 5 sp. Something like 7.7 0-60. all in all the 99' with a 6sp was a really run car. Just not an S2000.

Jay Li

SteveUCI, just curious...where have you seen a stock S2000 dyno at 246 at the wheels?!

VisualEchos

Does the total ammount of HP/TQ factor in here somewhere? Like a 400HP/400TQ vehicle losing more in the drivetrain as compared to a 200HP/200TQ? Utah...

Sev

I don't believe he meant at the wheels. He was speaking at the crank.

Chris S

S2K guy,

No, a fixed drivetrain loss % is pretty well accepted.

Mindcore, the line is not that blurry down the drivetrain, just calculate RWHP/(1 - drivetrain loss %) = est. crank HP

As far as hot temps producing low dyno figures, that s/b adjusted in the correction factor.

S2K_CLS

2x,

I was just referring to the driveline loss being around 15%... But, keep in mind, most people that dyno use the dynojet, which is economical, but is not truly accurate...

I know several instances of back to back runs that have varied by a LOT of hp (not on the S2000, per se).

I had a friend dyno his 944 Turbo at 320rwhp and then after a 5 min cool down, it only made 290... Pretty much attributed to the dynojet error...

Also, there are production variances on many cars... the LS1s in particular are known for that. I don't know if an engine like the F20C with the super close tolerances would be suspect to the same production variances...

I'd imagine that Honda's F20C does make 240 at the crank.

I do think some good points have been made on this thread though...

DavidM

Miata - Here the 'new' models are only 6-speed. The previos model was only 5-speed (except for a special limited edition offering).

S2000 and loss of power - Personally I noticie the difference in power from morning to night ... sometimes my car feels like it lacks the top-end puch and other times it's flying. It all depends on the quality of air at that time. I wouldn't be surprised if the powewr drops down to something like 150kW (200hp) when the conditions are bad. To me the car sometimes feels like it does not have more power than that. On a good day it certainly feels like 180kW (240hp) to me.