Sup, just had a quick question.. Been desprately lookin for the answer to this, but not with much luck or proof. Me and my dad are having your usual Skyline VS Supra stock for stock discussion, and hes tellin me that the Skylines hp is nowhere near the Supras 320hp output or so.. If Im not mistaken, I read in many places and heard many times that the 280hp posted by Nissan is not the actual horsepower that engine makes. The reason they do this is because something about Jap. goverment and legal reasons etc. But how does that make sense if the Supra officially and proudly flaunts it's 320hp claim. So does Honda with their NSX in japan, and Mazda with the RX-7.. From what I hear and according to this link the Skyline puts out 327hp stock..

http://www.jbskyline.net/R34/GTR/Specs/

I also remember in pretty much every Gran Turismo game that I played, the Skyline put out 327hp.. Can somebody please explain this confusion? Thanks.. ;)

There is a big difference between the JDM Supra and the USDM supra. The US market supra is probably closer to 300hp. However the JDM supra's were only 275hp which was the same as the GTR.
Here is where it gets interesting. In order for Nissan to keep the GTR to the "agreed" 275hp boost is restricted to around 8psi and ignition time is no greater than 18degs max.

We did absolutely nothing to my GTR other than remove the boost restrictor plug, and it produced 330hp. We remapped the factory ecu's ignition and fuel curves and it made 395hp. Put pods on, bigger front mount intercooler, and changed the exhaust to free flowing and made 450hp with the same tune.

The supra's ecu can't be retuned (already tuned pretty good) and since it uses a small primary turbo then bigger secondary turbo instead of parrelle twin's like the GTR they are in capable of making those numbers without changing the ecu, and turbo's they are at a disadvantage.

The supra's ecu can't be retuned (already tuned pretty good) and since it uses a small primary turbo then bigger secondary turbo instead of parrelle twin's like the GTR they are in capable of making those numbers without changing the ecu, and turbo's they are at a disadvantage.

Thats one of the reasons guys with the sequential twin turbos convert to a single turbo setup. But I have all so heard of guys converting parallel twin turbos to a single turbo.

1) Oh okay, so basically the GT-R's are restricted to stay under that 280hp mark, right?

2) Well I do have an old 90's mag where theres a commercial on the US MK4 Supra, and they do have the claim of 320hp. In all Gran Turismo games that is also the stock hp they put out. Thanks for the info, but Im still confused.. From what I understood, every cars potential is held back within the 280hp mark in Japan, but when they come to the US they are tuned for the power they claimed in the US? Did I understand correctly? So if you say the Supras ECU doesn't have any more room for tuning, what did they do once brought to the US? Or thats what they did once they brought it here? Tuned the ECU to max once they brought it here?

There is a big difference between the JDM Supra and the USDM supra. The US market supra is probably closer to 300hp. However the JDM supra's were only 275hp which was the same as the GTR.
Here is where it gets interesting. In order for Nissan to keep the GTR to the "agreed" 275hp boost is restricted to around 8psi and ignition time is no greater than 18degs max.

We did absolutely nothing to my GTR other than remove the boost restrictor plug, and it produced 330hp. We remapped the factory ecu's ignition and fuel curves and it made 395hp. Put pods on, bigger front mount intercooler, and changed the exhaust to free flowing and made 450hp with the same tune.

The supra's ecu can't be retuned (already tuned pretty good) and since it uses a small primary turbo then bigger secondary turbo instead of parrelle twin's like the GTR they are in capable of making those numbers without changing the ecu, and turbo's they are at a disadvantage.

Claims, claims, claims.

what I've told you as far as power output was verified on a chassis dyno.
Car's built for and sold in the US are different than those destined for the Japanese markets.

The "Gentlemans agreement" went out the window in the last couple of years in Japan. So vehicles which are being built and sold as JDM will have a much higher spec. Also even before they "claimed" 275hp but in fact were quite often much higher.
Take the R34 GTR's. With out a doubt were 325hp stock standard, even though Nissan only claimed them at 275.

Thats one of the reasons guys with the sequential twin turbos convert to a single turbo setup. But I have all so heard of guys converting parallel twin turbos to a single turbo.

That is correct for the Supra's and RX7 Series 6 batmobiles. Both had sequential turbo setups from the factory. They also did parallel twin setups on them.
As far as the GTR going from twin to single doesn't mean more power. As a matter of fact Veilside, and Top Secret both like twin setups, abit much bigger turbos. It can get really technical but a short answer would be. For the street a set of smaller twins like HKS 2530'S and the right tune can give you better performance and drivability than a single which would make the same power output of up to 650hp. Mine's prooved that.

Keep in mind the Supra is a much heavier car, and RWD only.

The Skyline GTR is lighter, a bit more nimble, and has part time AWD.

Also, you don't see many Supras at the track in Japan. Track days are dominated by Skylines and NSXs. Power is one thing, getting around a track is something different.

Just my 2 cents...

-AL

The "Gentlemans agreement" went out the window in the last couple of years in Japan. So vehicles which are being built and sold as JDM will have a much higher spec. Also even before they "claimed" 275hp but in fact were quite often much higher.
Take the R34 GTR's. With out a doubt were 325hp stock standard, even though Nissan only claimed them at 275.

For proof of that, one only has to look at the power/torque curves of the R32 and R34. Amazingly enough, their power curves overlap, while their torque curves don't. If that's not rediculously blatant...I don't know what is....

Claims, claims, claims.

what I've told you as far as power output was verified on a chassis dyno.
Car's built for and sold in the US are different than those destined for the Japanese markets.

The "Gentlemans agreement" went out the window in the last couple of years in Japan. So vehicles which are being built and sold as JDM will have a much higher spec. Also even before they "claimed" 275hp but in fact were quite often much higher.
Take the R34 GTR's. With out a doubt were 325hp stock standard, even though Nissan only claimed them at 275.

Well this "Gentlemans agreement" seems pretty pointless to me. Thanks alot for the info.

Heh, must feel good havin a GT-R in the US, eh? ;)

Keep in mind the Supra is a much heavier car, and RWD only.


Well according to this link http://toyota.jbcarpages.com/Supra/1995/index3.php the Supra is actually lighter then any generation base Skyline GT-R. Im quite surprised. But in the Gran Turismo games that I have played, the GT-R definatly feels more alive then the Supra.

Oh, and it's 276hp. The '280' is in ps, or pferdestarke.

Well according to this link http://toyota.jbcarpages.com/Supra/1995/index3.php the Supra is actually lighter then any generation base Skyline GT-R. Im quite surprised. But in the Gran Turismo games that I have played, the GT-R definatly feels more alive then the Supra.


According to Nissan the curb weight for the R32 GTR is 1470 - 1520 KG (or around 3300 lbs). The Supra is about 3515 lbs by most sources. Still a little heavie than the Skyline.

Don't see many here in Japan at the track. Race events and track days are dominated by GTRs and NSXs.

-AL

According to Nissan the curb weight for the R32 GTR is 1470 - 1520 KG (or around 3300 lbs). The Supra is about 3515 lbs by most sources. Still a little heavie than the Skyline.

Don't see many here in Japan at the track. Race events and track days are dominated by GTRs and NSXs.

-AL

Are you sure that were talkin about the Mk4 Supra? I know the Mk3 was close to 3600 pounds and I've heard many people wanting to switch over to the Mk4 because it's much lighter. I went out to find another source online and again, the Supra weighs around 3200lbs. http://auto.consumerguide.com/Auto/Used/reviews/full/index.cfm/id/2241/act/usedcarreviewspecs/

The weight issue could come down to a difference in models. I think there was a targa top version of the Supra. Toyota probably had to add some reinforcements, and that could account for a heavier curb weight. A regular coupe model could be the lighter one.

Well according to this link http://toyota.jbcarpages.com/Supra/1995/index3.php the Supra is actually lighter then any generation base Skyline GT-R.

1991 and earlier curb weights were 1430 kg. Says so on my title :)

The supra's ecu can't be retuned (already tuned pretty good) and since it uses a small primary turbo then bigger secondary turbo instead of parrelle twin's like the GTR they are in capable of making those numbers without changing the ecu, and turbo's they are at a disadvantage.


The Supra's turbos are both the same size! One comes on till 4000rev then both.

here is the situation there is the real hp and the offical hp the offical hp is 280 because there in japan the limit of a car hp is 280 so the offical is 280 hp the real is 327 hp this is why the skyline beats the supra in a 1/4 mile and so forth just to clear this up the 4.5 v8 tt will be used and there is a v6 to this will no be used in jap decause it pushes 450hp and over laz

idoes any one know of a 3.5 straight 6 skyline it is a myth or is it real

well just from the gran tursimo point of view, look at the skyline before purchase, quoted at around 280 hp, buy it and take home then look at the hp rating again :P hehe takes a bit of a jump. I cant rember if it was in the gt2 or 3 or maby even all of them, but it was there way of umm pokeing fun at the "gentlemans aggrement"


1) Oh okay, so basically the GT-R's are restricted to stay under that 280hp mark, right?

2) Well I do have an old 90's mag where theres a commercial on the US MK4 Supra, and they do have the claim of 320hp. In all Gran Turismo games that is also the stock hp they put out. Thanks for the info, but Im still confused.. From what I understood, every cars potential is held back within the 280hp mark in Japan, but when they come to the US they are tuned for the power they claimed in the US? Did I understand correctly? So if you say the Supras ECU doesn't have any more room for tuning, what did they do once brought to the US? Or thats what they did once they brought it here? Tuned the ECU to max once they brought it here?

here is the situation there is the real hp and the offical hp the offical hp is 280 because there in japan the limit of a car hp is 280 so the offical is 280 hp the real is 327 hp this is why the skyline beats the supra in a 1/4 mile and so forth just to clear this up the 4.5 v8 tt will be used and there is a v6 to this will no be used in jap decause it pushes 450hp and over laz

I think they decided to use the V6 TT only in all the R35's. Just what I heard anyway. Don't know about the 450Z though.

idoes any one know of a 3.5 straight 6 skyline it is a myth or is it real

I would call it a myth.

well just from the gran tursimo point of view, look at the skyline before purchase, quoted at around 280 hp, buy it and take home then look at the hp rating again :P hehe takes a bit of a jump. I cant rember if it was in the gt2 or 3 or maby even all of them, but it was there way of umm pokeing fun at the "gentlemans aggrement"

Of course I noticed that. ;) But I never thought of it as poking fun. Hehe, yeah it's pretty much true I guess. :lol2: And it was in all of them btw.