87 Octane Dyno

Slip_Angle

Registered Member
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Canada
Genesis G70
I'm curious if anyone's seen a dyno chart running 87 octane in the 3.3T. I've run 91 ever since I bought the car but since winter is here now, I'm trying out 87. I've heard (unofficially) that there is a minor power drop but nothing material. Butt dyno says no change whatsoever.
 

NLJ

Registered Member
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1,073
113
Vancouver
Genesis G80
Shouldn’t effect your torque but there will be a drop in peak HP.
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NLJ

Registered Member
1,919
1,073
113
Vancouver
Genesis G80
So it would change the shape of the torque curve, to a lower RPM?
Not entirely sure. Just making an educated guess based on the Mazda CX-9 which has the same torque throughout and only an increase in HP with premium.
Also HP is made at higher rpm anyway and that is where you see the effect of power reduced.
I used regular a few times last winter and didn't notice much difference but I was also driving in Eco.
 

Husky

Registered Member
715
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Genesis G70
I was just wondering, since hp=torque x rpm / 5252. (So hp will always equal torque at 5252 rpm - neat!)
The only way to change hp without changing torque is to change the rpm that the torque occurs at. I guess this could be octane dependent if the ECU adjusts valve timing or ignition timing accordingly.
 
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