stanleylee

as i know , japan's 8 have 250 hp and 22 torque
and those we got are 232 hp and 15.9 torque.
anyone whats different ? some engine parts different or only computer setting different ?
if only the only different are the compute, is that mean we ccould just "upgrade" the program to japanese one and will able to get 250 and 22 torque as well ?

dillsrotary

we all have the same power, we each just measure ours differently.

nycgps

iTrader: (1)

Not true

We start with *lower* power than our Japanese cousin due to emission regulations. Not much , by a few horses.

of course we mesaure the HP differently, we do ours in the SAE way.

and no you cannot switch ECU like that, because it was designed with diff year and RHD/LHD. So you cannot just jack a japanese ECU and hope that it will work in ours. it just wont happen.

If you want something faster, get RB flash.

dillsrotary

^ did not know that, i stand corrected

Brettus

iTrader: (2)

you are both wrong - the Japanese version comes equipped with a turbonater that adds 18 hp .

Razz1

shh.... don't tell them.

Swerve76

Jap version comes with lifetime supply of sushi too i think

KRNrx8Driver

japan has over 100 octane gas too...compared to the weak 91-93 octane depending where you're from i believe in japan its like 103 is high octane.

nycgps

iTrader: (1)

Octance rating has NOTHING to do with performance.

Its a Knock Resisting Index.

FE'dup

How do you figure octane doesn't affect performance??? Maybe not in a bone-stock RX8, but the more air you feed into your motor (i.e. turbo) the better you are going to want your fuel to combust. The higher the octane the better the combustion, plain and simple.

Easy_E1

iTrader: (2)

If your refering the the performance of your engine as it KNOCKS. Then yes it will effect performance. The higher the octane the less chance of pre detenation of the Air/fuel mixture. A higher octane slows down the burn rate of fuel. That is why when you have forced induction/higher compression the AF mixture is hotter due to pressure/friction increase. This in turn will create detenation of the A/F mixture prematurely in lower octane fuels. Fuel will ignite under pressure/heat. Higher octane slows the burn rate down under pressure/heat.
Thus eliminating the ping I hear when it gets to 120 degrees outside.
And thus improving my performance ,,right?

mysql101

No, the higher it is, the more it resists combustion (when compressed). You don't want it igniting at the wrong time.

nycgps

iTrader: (1)

Thank you.

I think he was too *into* what those *gasoline* company saids.

For example : "Cleaner Engine with BP Ulitmate!*

JeRKy 8 Owner

Wow...2 or 3 more ponies. Yeah...you'll be able to do a lot with that.

zoom44

yes exactly. the more it resists incorrect/ill timed combustion when compressed.

you want the fuel to burn as the flame front hits it- you do not want it to burn ahead of the flame front. octane is the way fuel is rated to show how much that fuel not in the flame front resists spontaneously combusting and causing a knock/ping. any more octane higher than what keeps the fuel from knocking is superfluous.

zoom44

you may have noticed i did not address the HP topic- thats because there is another post with this same question giving the same answers not over a week ago.

PerSmitt

In Sweden we have 95, 98 and 99 octane fuel.

Dyno with 95 octane: 217 hp (at the eccentric shaft)
Dyno with 99 octane: 229 hp (at the eccentric shaft)

Tests done with 2 minutes in between. Same car, same dyno, same calibration same everything. Difference was 20 litres of added 99 octane in the fuel tank. If it was something else in the fuel that made the difference i dont know. It was V-Power 99 octane compared to no-name 95 octane fuel.

Draw whatever conclusions you want. My conclusion isthat i fuel up with 99 octane V-Power and enjoy a bit extra power.

Spin9k

The hypothesis I would offer up to explain those empirical results is that your ECU and knock sensor are correctly adjusting engine combustion parameters to produce more power (from higher octane gas). That is, the car is capable of more powe w/hi-octane gas as it was designed for it.

However, the actual energy available in higher octane gas is somewhat less than lower octane gas, due to the extra octane additives, but the engine is able to adjust itself and can utilize what energy is there more effectively giving the stated higher HP output.

Also as a check against engine heat soak HP differences, one should have also reversed the test taking the 99 out and putting 95 back and testing again. I've read of dynos without mods, then dynos with mods done, then removing them again and w/redyno found increased HP over 1st test. Something to think about, there are erros (haha) that can show up everywhere without realizing they are possible.