Using Octane 102 and 30 bhp increase
Thread Starter
Instructor
Joined: Aug 2008
Posts: 172
Likes: 24
Using Octane 102 and 30 bhp increase
(UK Figures)
What are the BHP differences using Octane 95, 99 and 102.
Porsche says that using recommended Octane 98 the BHP will be 325BHP in a Porsche 981S cayman.
For example ive heard using octane 95 will reduce the BHP by about 10 percent. - Is this true?
While using Octane 102 will increase the BHP by 20 to 30 BHP. - again is this true?
For example PistonHeads did a comparison and reported difference between running 95 octane fuel and Tesco 99 fuel was over 40bhp;
Link = PistonHeads Report
Does anyone have any experience using Octane 102?
Thanks Mike
What are the BHP differences using Octane 95, 99 and 102.
Porsche says that using recommended Octane 98 the BHP will be 325BHP in a Porsche 981S cayman.
For example ive heard using octane 95 will reduce the BHP by about 10 percent. - Is this true?
While using Octane 102 will increase the BHP by 20 to 30 BHP. - again is this true?
For example PistonHeads did a comparison and reported difference between running 95 octane fuel and Tesco 99 fuel was over 40bhp;
Link = PistonHeads Report
Does anyone have any experience using Octane 102?
Thanks Mike
Racer
Joined: Aug 2017
Posts: 487
Likes: 14
From: Michigan
Not a universal standard and not true for any and every vehicle. If you just drive to the fuel station and decide to put 102 octane in your car you are not going to see a 40bhp improvement. You might see 5bhp. It all depends on how the OEM chose to calibrate the engine and what features exist in the control algorithms to allow it to learn and self-adjust. That 40bhp increase is only going to happen if you head to an aftermarket shop and have them recalibrate the engine to take maximum advantage of the higher octane fuel. Higher detonation resistance allows more aggressive timing advance and a little leaner air/fuel ratio. You car won't learn to take it to the extremes on its own. The down side here is that the aggressive engine calibration then requires you to always use the 102 octane or risk detonation / knock.
Three Wheelin'
Joined: Jun 2018
Posts: 1,527
Likes: 238
If the honda has the software mapping for it, certainly possible. High end cars that need 91-93 octane (here in USA) that get 87 placed into them, detune the timing and other things (which reduce HP) quite a bit to avoid pre-detonation.
Rennlist Member
Joined: May 2001
Posts: 2,998
Likes: 380
From: Chicago Area
In the race car (968), we had to specifically tune the chip to the octane for best performance. That car was normally aspirated, similar displacement (3.0L) and variable valve timing... running on a blend achieving approx 102 Octane.. On the race engine, it seemed worth the dyno / chip tuning. Never measured the exact bump in BHP, but rather worked to optimize the combo at hand. Likely resulted in some extra 2-4 mph at the end of a long straight, which mattered in the wheel-to-wheel world, a lot.
On a street car, I stick to the reliability and performance already baked in by Porsche engineers. Your mileage may vary.
On a street car, I stick to the reliability and performance already baked in by Porsche engineers. Your mileage may vary.
Racer
Joined: Nov 2003
Posts: 462
Likes: 16
From: Marin County, CA
Don't forget about differences in Octane numbers. Different places use different numbers. In the USA the formula is RON+MON/2= our Octane number. (RON = 'Research Octane, and MON = Motor Octane), whatever that is. Basically 'our' octane number isn't everyones.
