rednikos

Octane is measured differently in europe

100 octane there is ~94 in north america

nemesisryder0627

Oh ok so barely better than 93. That's really good. The kinsler itbs must have helped a lot as well as inline pros stage 3 cam. How's drivability with the itbs?

BuggyofMildDiscomfort

100 octane here is actually more like 96 in the US, or just shy.

rednikos

Europe USA
95 = 87
97 = 89
99 = 91
101 = 93

rednikos

the itbs are jenvey..i think that kinsler will be better for top power.the cams yes are very hepfull but i had dyno the bc stage 2 and there was not too much diffrent.. i have no problem with itbs .now i have make and a custom plenum.they work perfect.

BuggyofMildDiscomfort

No, what you have there is RON vs MON, the USA uses PON, which is the average of RON+MON.
So it goes

95 = 91
97 = 93
99 = 95
101 = 97

Give or take a little.

nemesisryder0627

101+93=194. 194/2=97

rednikos

i m comfused.i dont know how to calculate it. i just google it..

nemesisryder0627

If I am understanding this correctly there are three different types of ratings. RON (Research Octane Number), MON (Motor Octane Number), and AKI (Anti-Knock Index) also known as PON (Pump Octane Number).

The rating used in Europe is RON and that would be the following values you provided

95
97
99
101

The rating that shows how fuel behaves when under load is the MON and are the following corresponding values

87
89
91
93

The rating for USA gas is AKI also known as PON and is determined by taking RON+MON and then dividing them by 2 and are shown below.

95 + 87 = 182 182 / 2 = 91
97 + 89 = 186 186 / 2 = 93
99 + 91 = 190 190 / 2 = 95
101 + 93 = 194 194 / 2 = 97

So in conclusion your 100 oct in euro would be closer to a 96 octane equivalent in the USA and if you did your dyno using a 97 it would be like our 93. Either way doesn't really matter because unless all cars all done on the exact same dyno/weather conditions (temperture and humidity and elevation)/tuner there's now 100% way to compare.

Did you notice a powerloss making a manifold for your ITB's?

rednikos

thanks for all that help..
the car has the same power when it's cold and when it's warm...
the air/fuel it's the same exept low speed that I think that I lost a very small ammount of power.. the a/f was 13,2:1 and made 12,9:1 -13,1:1. 3000-5000 rpm