Can't read the Japanese print but looks like Tom's may be offering an ECU upgrade for the F. Here is the link:

http://www.tomsracing.co.jp/arcive/2.../03_02_02.html

 

Why am I always the one using google translate. Anyways here's what could be translated:

http://translate.google.com/translat...ml&sl=ja&tl=en

 

It is a speed limiter cut, it is not an ECU upgrade.

 

What would the drag limited top speed on the IS-F 186mph?

 

for some reason.. i think this was the one.. that took the governor off period.. so the car could top out at whatever it could maybe close to 200?

 

Think you're gonna need another 150-200 HP and wings, diffusers, tape and all kinds of aero aids as well as 3-4 miles of flat straight road. That last 30 mph needs exponential power to overcome the wind resistance. I'm sure an engineer on this board could tell us more. I think it would be a white knuckle flight....

 

I think 186 sounds right, but of course we have heard about the internet rumors that 200 is possible (highly doubt it).

Moreover, anyone besides the Germans/Euros for the autobahn who spends money to make their IS-F faster than 170 is a freaking maniac!

 

This can mean one thing, TOM'S supercharged F on the way. maybe this time it wouldnt be JDM only.
Does anyone know if the JDM ecu is diff than the USDM?

 

My thoughts would be that it would due to the difference in fuel.

 

The fuel's not that different. The way it's rated is, but the fuel itself isn't. Japan and Europe specify octane by the Research number. It is the anti-knock level for light loads, also called RON. The US uses (RON + MON)/2 also called AKI. MON is the octane number measured under heavy load. Most racers don't care about RON or AKI, they only look at MON because its a better test of a fuel under racing conditions. Since Japan and Europe use RON and not AKI, their octane numbers appear to be higher, but in fact are essentially the same as the US 49 state fuels. California pump gasoline isn't fit for a lawnmower. Just one of the many reasons I left.

Very often the JDM ECM uses MAP, not MAF, so the engine control strategy is completely different, and they are not at all interchangeable. US emissions requirements practically require MAF, Japan's can be met with MAP and MAP has some advantages over MAF, so it's not unusual at all to see a JDM engine with MAP and the corresponding US version to have MAF.