Hey guy’s quick questions since ill be taking my car to the track this weekend for one or two runs only. But wanted to know what is a safe octane level. I don’t want to mix so I want to know what is the purest octane possible and safely. This is my tune

My timing is retarded 10 degrees under full boost I run 10 psi so every pound=1% of timing taken off my a/f depends but normally its a 11.4 to 11.7 my guess with higher octane ill be running richer but I took out my airniz and put thin mesh to get more air through maybe this will compensate the higher octane and make a better mixture. My block is completely stock I have a Crawford plenum AAM 3 inch turbo back with w/g dumps and full 3inch dual breathing wise im their.

Please im looking for advise but I need it from people that know their S*** as some might say. I was thinking about 104 octane which they sell for $40 for 5 gallons.

 

just curious to why you're running so rich? you hitting 11s at cruising speed? I personally gonna do a bit of testing.. mixing mostly with 91 california poo gas with 100, 98 and whatever else I can get my hands on.

 

no that's at WOT

 

104 would run fine in your car. Hell if they got some 110 that would be good also. I run around on 100 octane with a 91 octane tune. If 116 was readily available I would run that everyday.

or if you wanna boost your octane for everyday driving get some Torco Accelerator and add that to your 91 or 93 octane.

 

But remember my internals are stock i thought i heard that only up to a certain level of octane could be run on a stock motor.

 

the higher octane is safe for your stock internals.

You dont want to go to LOW octane.

 

i know that i always use 93 but isnt that explosion to strong i know 104 is i guess border line but 116 way to strong i can get 104 to 116

 

Higher octane will help prevent detonation, not cause it.

If you are tuned safely and conservatively running 93, then there is no sense in running higher octane unless you tune more aggressively to take advantage of it (add timing and/or boost).

Also, if you are running cats try to stick with unleaded gasoline.

 

Also, you might test your filter back to back verse the mesh screen - there has been some debate in the past that mesh screens restrict more than K&Ns etc.

 

And if you are running a wideband all the time, run unleaded when possible because leaded will reduce o2 sensor life drastically...but if you don't mind replacing o2 sensors and don't have cats, using leaded is fine

 

Premature or non linear detonation or any burn that doesn't create peak pressure at 14-16 degrees after TDC is bad for power production.

All about the force vs rod angle, what burn directs the most force into rotating the crank instead of driving the piston straight down and hammering the rod into the road/crank bearing............if peak force occur before the 14-16 degrees ATDC they greatly diminish the engines reliability.

The higher the octane the slower the fuel burn propagation is assumming the exact same A/F ratio................why the KS system can advance the ignition timing.

Also you must balance the good effects of octane numbers with the bad effects of reduced BTU per gallon and density, as the peak pressure tracks downward with lower BTU [ethanol and reduce aromatics].

Future cars will use pressure sensors inside $200 each sparkplugs to measure BMEP vs crank angle as is done now on race cars to adjust each individual cylinder for best power.................continuously.
The functional equivalent of an EGT sensor on each exhaust port.