Nissan Forum banner

1 - 20 of 34 Posts

·
Registered
Joined
·
139 Posts
Discussion Starter #1
I heard that the japanese government only allows cars in japan to have no more than 280 HP. If skylines in other countries are pushing close to 330hp stock (which is what I heard) then what does japan do to restrict the extra horsepower?
 

·
Registered
Joined
·
145 Posts
the whoel deal is complicated. but its not imposed by the japanese government. it was a gentlmens agreement between japanese and european auto makers basically saying that they wont put street legal cars under production with more than 300 horsepower at the wheels. which is why the sti and the evo and skyline barley skim the surface. "officially" GT-R's have 276 to the wheels, but put it on a dyno and youll see low-mid 300 horses.
 

·
Registered
Joined
·
33 Posts
Air intake and exhaust inhibit performance on most home market cars. First mods are new induction kit and a straight through big bore exhaust system with possible de-cat.
 

·
Boxed Fox
Joined
·
1,313 Posts
tougedrifter said:
the whoel deal is complicated. but its not imposed by the japanese government. it was a gentlmens agreement between japanese and european auto makers basically saying that they wont put street legal cars under production with more than 300 horsepower at the wheels. which is why the sti and the evo and skyline barley skim the surface. "officially" GT-R's have 276 to the wheels, but put it on a dyno and youll see low-mid 300 horses.
Good news for us though is the still not widely known fact that some Japanese companies are officially beginning to ignore the 280ps restriction for cars sold in Japan. The Japanese Market Honda Legend (Acura RL in the US) is amongst several new(er) cars now sold in Japan which claim 300ps official output.
 

·
My ass, your face
Joined
·
3,520 Posts
its not a law...its just an "agreement". no one is holding the japanese market from producing more than 280hp
 

·
Boxed Fox
Joined
·
1,313 Posts
cHoPs said:
its not a law...its just an "agreement". no one is holding the japanese market from producing more than 280hp
The first part is true. However, it is also an undeniable fact that Japanese manufacturers have been following this "agreement" (albeit loosely at times) and have been limiting the output of their products (de-tuning, as some call it) because of it. It is also fact that the original agreement stated that Japanese auto manufacturers which grossly violate the 280ps restriction would be barred from certain PR events. Even if it wasn't law, there were reasons for manufacturers to abide by the rules they set.
 

·
Banned
Joined
·
3,785 Posts
In any case, the 280 Hp "restriction" not been followed since the early-mid 90s. The Supra TT at 300 Hp, the 3000GT at 320 Hp, the 300Z TT at 300 Hp, the list goes on......
 

·
Boxed Fox
Joined
·
1,313 Posts
In any case, the 280 Hp "restriction" not been followed since the early-mid 90s. The Supra TT at 300 Hp, the 3000GT at 320 Hp, the 300Z TT at 300 Hp, the list goes on......
You guys are missing the point. There's a difference between going a bit over without telling anyone and being able to release 400ps machines without having insurance companies and competing manufacturers glaring down at you for your actions.
 

·
Viva el iPod
Joined
·
1,232 Posts
tougedrifter said:
the whoel deal is complicated. but its not imposed by the japanese government. it was a gentlmens agreement between japanese and european auto makers basically saying that they wont put street legal cars under production with more than 300 horsepower at the wheels. which is why the sti and the evo and skyline barley skim the surface. "officially" GT-R's have 276 to the wheels, but put it on a dyno and youll see low-mid 300 horses.
THe WRX is also limited by homologation/HP limits imposed by WRC rules. WRC cars are limited to only 300 HP.

This gentlemen's agreement is similar to the rule GM had for its divisions back in the 60s, that no intermediate size cars were allowed to have a V-8, it wasn't a law or anything, but Delorean added one as an option to the Tempest and started the Muscle car era. Maybe if one Japanese maker blatently breaks the agreement (like a 400HP car) the others will be forced to do it as well, like with what happened with the GTO. I doubt it, given the conservative nature of the Japanese auto-makers' management.
 

·
Registered
Joined
·
145 Posts
In any case, the 280 Hp "restriction" not been followed since the early-mid 90s. The Supra TT at 300 Hp, the 3000GT at 320 Hp, the 300Z TT at 300 Hp, the list goes on......

the horsepower restriction was to the wheels i thought. because the 300z TT was at the same spot as the skyline at 276. maybe its at the flywheel :?.
 

·
Registered
Joined
·
118 Posts
It was 280hp at the wheels.
Recently the agreement has been overlooked by a few companies and it appears that soon everyone will forget about it.
Even though some supras and 300zx's have been over the 300hp mark, on paper they all said 276hp.
 

·
Banned
Joined
·
3,785 Posts
Kouki S14 said:
It was 280hp at the wheels.
Recently the agreement has been overlooked by a few companies and it appears that soon everyone will forget about it.
Even though some supras and 300zx's have been over the 300hp mark, on paper they all said 276hp.
On Japanese paper, maybe. On American paper they are as I stated. ;)
 

·
Registered
Joined
·
47 Posts
tougedrifter said:
haha thats because us americans are stupid when it comes to cars. they market cars with numbers at the crank so it looks like they have more useable power than they really do.
Just exactly...
 

·
Banned
Joined
·
3,785 Posts
In that case, the actual Hp rating on the American version of the Mk-4 Supra was 326.
The horsepower measurments are all taken in the the same area, IE the flywheel, it's simply the difference between metric Hp and SAE Hp. You don't beleive me , google it........ ;)
 

·
Registered
Joined
·
22 Posts
Well unofficially, the HP limit was lifted by the new Honda Legend (Acura RL). The government allowed for them to market it as a 300 HP car. Good move, now Nissan can really exploit their resources for the new GT-R :cheers:
 

·
Registered
Joined
·
179 Posts
In that case, the actual Hp rating on the American version of the Mk-4 Supra was 326.
The horsepower measurments are all taken in the the same area, IE the flywheel, it's simply the difference between metric Hp and SAE Hp. You don't beleive me , google it........ ;)
It's not simply the difference of metric/SAE hp. The Japanese "agreement" is for 280 PS (metric HP) which equals just over 276 HP.
Tougedrifter is right, Americans easily fall for the HP figures. Whithout knowing what they truely are. Most vehicles are sold in the US with a bhp (brake horsepower) figure, the power at the crankshaft.

Now, the Japanese "agreement" was never made for a specific hp test location or conditions. So, most Japanese high hp vehicles are sold with the whp (wheel horsepower) figure, the power at the drive wheels.

Now, take a factory GTR, put it on a dyno, and it will usually beat the 276hp. This is due to one other trick the manufacture does, they take their final PS figure, if it's over 280, they factor in power loss due to road friction, wind, etc. and amazingly, all the Japanese perfomance vehicles match 280ps exactly, on Japanese paper.
 

·
Banned
Joined
·
3,785 Posts
GTES-t said:
This is due to one other trick the manufacture does, they take their final PS figure, if it's over 280, they factor in power loss due to road friction, wind, etc. and amazingly, all the Japanese perfomance vehicles match 280ps exactly, on Japanese paper.

Road friction, wind and etc does not cause a loss of power , it simply increases "road hp", the power required to keep the vehicle moving at a steady speed on a flat surface at a certain mph. It used to be tested at 30,50 and 70 mph, not sure what it is now. The only place power losses can actually occur after the engine, is in the drivetrain.
 

·
Registered
Joined
·
22 Posts
Road friction, wind and etc does not cause a loss of power , it simply increases "road hp", the power required to keep the vehicle moving at a steady speed on a flat surface at a certain mph. It used to be tested at 30,50 and 70 mph, not sure what it is now. The only place power losses can actually occur after the engine, is in the drivetrain.
:thumbup:

well said! simply physics, basically. Higher the Friction Force is, the higher the Applied Force needs to be.
 
1 - 20 of 34 Posts
Top