ECU tuning JDM vs USDM

[ridered777]

It would appear "Curfa" is "Chorus"... That's all I got.

[TomsSVX]

I am not sure what you are implying with your posts. All I know is a couple of LAN's reasons for not posting here. You can use what you have but I wouldn't expect anymore from him since it is his business, why shoot himself in the foot? As for Jason, it was merely an example as to why he won't post info on this because his goal was to copy it and make his own chips to sell and thus wipe out ECUtune... Don't ask how I know this because I will not reveal my source but I ask that this go no further. not picking on anyone but stating the truth

Tom

[svxistentialist]

I think it is reasonable and fair that if LAN is making a living out of modifying SVX ECUs, then he should keep his development work secret, so that he alone can sell his modifications.

The same would apply to Jason, that is, it would apply if Jason did the work of modifying the factory parameters. There is a concept of intellectual copyright that dictates ownership and fair play in these things.

If Jason was going to copy somebody else's work, and sell it in competition against them, that is not fair ball, not kosher.

However, we have only Tom's word on that, and Tom is keeping his sources confidential. Considering Tom that there could be a litigation issue regards this allegation, and such issues could auger badly for the Network, I would ask you not to bring this matter up again. I don't want to close the thread, because the work of Phil and Nomake Wan is too valuable to the general membership, but no more reference to a certain banned ex-member called Budfreak, please.

Joe.

[TomsSVX]

believe me I love the work they have done and I am trying to get my reader assembled too. I am looking to be able to scan my own vehicle and have no desire to make software for anyone. My alligations can be taken as serious or just a point I was trying to make. not accusing because I don't need to. Just highlighting an issue that has since past in order to explain why LAN won't share this kind of material. There is a copywrite law and LAN does have his software copywritten so that copies cannot be made. Besdies that... Lets hear what other think of the JDM vs USDM maps. I that the major contributing factor is emissions standards and typical fuel octane. This in conjunction with the hp regulations subaru was enforcing upon each model... What'd you guys think of that

Tom

[Nomake Wan]

Jesus you guys, would you get that Jason crap out of this thread please?

Also, allow me to reassure everyone I have absolutely no intention to dump a Stage 1 and share it with the world. That would be... what's the proper terminology... "Revealing trade secrets?" I just am not into that. Would it be cool to see? Sure. But it's not gonna come from me and it's not gonna come from Phil. If you want to make enemies of LAN, you can do it on your own.

So please, back to the topic at hand. Anyone able to interpret those maps? I'm still waiting on my NZ friends to hit me back about it...

[floatingkiwi]

Does anyone know if there is a particular reason why the fuel and knock maps vary so much between the 2 markets? I would assume along the lines of emissions - but there has been suggestions before that the US map is different to try and limit loading on the US transmission. Any validity to this? Different fuel types? The internals of the engine is identical I believe - apart from the extra O2 sensor on the later ones.

Matt

[Trevor]

Originally Posted by floatingkiwi

Does anyone know if there is a particular reason why the fuel and knock maps vary so much between the 2 markets? I would assume along the lines of emissions - but there has been suggestions before that the US map is different to try and limit loading on the US transmission. Any validity to this? Different fuel types? The internals of the engine is identical I believe - apart from the extra O2 sensor on the later ones.

Matt

US cars run a taller gear ratio and this would represent a logical reason for greater emphasis on mid range torque, as opposed to top end power.

[TomsSVX]

Trevor, do you really think such a minor difference is gearing would be the cause for fairly large gaps in the maps? I have a feeling it is an emissions thing more than anything but you may be onto something here

Tom

[NiftySVX]

I'm going to ask, because I don't know...

Is there a higher octane fuel readily available in places where the JDM cars are run? I would think that the book would call for such a fuel if that explains the difference we have seen.

[b3lha]

Originally Posted by NiftySVX

I'm going to ask, because I don't know...

Is there a higher octane fuel readily available in places where the JDM cars are run? I would think that the book would call for such a fuel if that explains the difference we have seen.

I've heard that in Japan, there are two grades of fuel. 100 octane and 103 octane. Performance cars, like the SVX, are supposed to run on 103.

I run mine on UK "standard" 95 octane without any noticable problems. But they do seem to run better if I run them on "super", which is 97, 98 or 99 octane depending on where you buy it.

[svxistentialist]

Owner manuals in Europe and in Japan insist on Super Unleaded.

Of course as Phil says, Super means different things in different countries. SFAIK Japan the home market seems to have the highest octane available on the street.

I ran mine on Unleaded [95] and it worked OK, never a murmur. However it ran sweeter on Super or Super Plus, and I now use Octane Booster all the time in my Japanese cars.

Trevor has a very strong point about the high final drive needing more mid-range torque, it is sure to be a big factor. If you combine that with the fact that some parts of USA seem to have really low octane fuel, I suspect the map was tuned to take these two factors into account.

Joe

[It's Just Eric]

103 octane!? 95 being LOW!? Geeze man, the highest ive seen at the pump was 94 octane...Usually "Premium" is between 91 and 93.

My guess is, the changes have more to do with that, and meeting us emissions

[svxistentialist]

Originally Posted by It's Just Eric

103 octane!? 95 being LOW!? Geeze man, the highest ive seen at the pump was 94 octane...Usually "Premium" is between 91 and 93.

My guess is, the changes have more to do with that, and meeting us emissions

95 is low here Eric.

The USA uses a different way of measuring Octane, so the numbers don't mean the same thing.

Joe

[paddlesnz]

Originally Posted by b3lha

I've heard that in Japan, there are two grades of fuel. 100 octane and 103 octane. Performance cars, like the SVX, are supposed to run on 103.

The two standard grades sold in Japan are 'Regular' which is 90-92 octane and 'High Octane' which is 98-100 octane.

[redlinedeath]

well, to my understanding the different knock index ratings are because of different measurements. MON and RON are used in different places, but in the us, its an average of the two? i know that 87 here(US) is equivelant to 90-91 overseas. that im sure of. i did a short report on it in school. but that was in 9th grade. 9 years ago.