Discussion
I currently own a phase 1 S2000 with an AEM V2 air filter system. The engine isn't modified in any other way.
Recently I got the car put on the rollers and it made 202.9 @ roughly 7750rpm and 146 lb/ft @ 5800rpm. Both figures are down on what Honda states the engine produces.
Did Honda come up with these figures on a bench instead of when the engine was fitted to an actual car? Has anyone else dyno'd their S2000 in standard trim to find out it had less power?
Engine drives fine, just a little confused.
Recently I got the car put on the rollers and it made 202.9 @ roughly 7750rpm and 146 lb/ft @ 5800rpm. Both figures are down on what Honda states the engine produces.
Did Honda come up with these figures on a bench instead of when the engine was fitted to an actual car? Has anyone else dyno'd their S2000 in standard trim to find out it had less power?
Engine drives fine, just a little confused.
Also RR are notoriously inaccurate as a guide to actual power output. For one, the figures have a certain element of "guesstimation" involved.
However, they are useful when tuning/modding your car to get before/after figures etc.
FWIW, most RRs I see people posting on s2ki come up at around 200bhp+ (at wheels) which works out to 235bhp if a 17.5% losses is used.
However, they are useful when tuning/modding your car to get before/after figures etc.
FWIW, most RRs I see people posting on s2ki come up at around 200bhp+ (at wheels) which works out to 235bhp if a 17.5% losses is used.
Edited by Dracoro on Monday 8th September 21:46
Give them a call and ask them for the figure at the wheels and what correction factor they used.
Have you "compared" the performance of your car against any other S2k's or indeed anything else?
If it was actually only putting out 200bhp @ the fly you'd be in CTR territory, whereas for reference I absolutely pulled an FN2 CTR's pants down a few days ago (Mines standard except for a cat back exhuast)
Have you "compared" the performance of your car against any other S2k's or indeed anything else?
If it was actually only putting out 200bhp @ the fly you'd be in CTR territory, whereas for reference I absolutely pulled an FN2 CTR's pants down a few days ago (Mines standard except for a cat back exhuast)
Jockstar205 said:
No that's flywheel figures and from another video on you tube I see I'm not the only one. I'm not convinced they make 237.
Anyone else rollered there S2K? If it was a knacker I think I'd notice driving it but thanks for that.
You're welcome sir..Anyone else rollered there S2K? If it was a knacker I think I'd notice driving it but thanks for that.
Also, isn't the quoted peak horsepower at 8300rpm or thereabouts? ?Perhaps you had an old Mintoe stuck under the throttle pedal?
Ok well had the S2000 on the rollers again but this time at Star Performance. Results are as follows :
245.5 bhp @ the flywheel
185.0 bhp @ the wheels
Drag = 57.0 bhp
Max power @ 111mph or 8590rpm in 4th gear.
Max Torque @ 98mph or 7540rpm (152lb/ft @ flywheel)
Max speed in 4th = 116mph @ 8920rpm
Air pressure = 994 mbar
Air Temperature = 17 degrees (although the operator said it might have been chilled as lows as 13 degrees)
Bascially the difference between Star and Hypertech that jumped out at me is their 2 huge fans which are worth 5 grand each and they take air from outside the premises not inside.
When he fired them up they sounded like turbines. At Hypertech they closed my bonnet and pointed the hand held fan at my filter behind the front bumper. Not quite the same!
At Star they also left my bonnet open. I believe the difference in result is down to more efficient cooling methods.
Anyway I'm happier now as you can imagine.
245.5 bhp @ the flywheel
185.0 bhp @ the wheels
Drag = 57.0 bhp
Max power @ 111mph or 8590rpm in 4th gear.
Max Torque @ 98mph or 7540rpm (152lb/ft @ flywheel)
Max speed in 4th = 116mph @ 8920rpm
Air pressure = 994 mbar
Air Temperature = 17 degrees (although the operator said it might have been chilled as lows as 13 degrees)
Bascially the difference between Star and Hypertech that jumped out at me is their 2 huge fans which are worth 5 grand each and they take air from outside the premises not inside.
When he fired them up they sounded like turbines. At Hypertech they closed my bonnet and pointed the hand held fan at my filter behind the front bumper. Not quite the same!
At Star they also left my bonnet open. I believe the difference in result is down to more efficient cooling methods.
Anyway I'm happier now as you can imagine.
Do you know the at the wheels figure that the first place recorded or did they just tell you the estimated flywheel figure.
Trying to work out the flywheel BHP from the power at the wheels leads to a big ammount of innacuracy.
The only usefull way to use a dyno at the wheels is to compare two cars that should be the same (go to a club dyno day)
They are not usefull for comparing your car to the manufactuers figures, or your car to another tested on a different dyno (or even the same dyno on a different day)
Trying to work out the flywheel BHP from the power at the wheels leads to a big ammount of innacuracy.
The only usefull way to use a dyno at the wheels is to compare two cars that should be the same (go to a club dyno day)
They are not usefull for comparing your car to the manufactuers figures, or your car to another tested on a different dyno (or even the same dyno on a different day)
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