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What is the lowest octane an RX8 can safely use?

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What is the lowest octane an RX8 can safely use?

Old 12-28-2018, 09:18 AM
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Originally Posted by swoope View Post
and how good where the knock sensors before 2004?

i will say as at 140k miles on 87 street and 93 on track it has been all good.. note, if under cruise on the interstate 87 gets the nod for mileage.

Swoope that includes my 2008 RX8. I just think to believe we know more about the proper care for the best performance and longevity of these engines, than the engineers who designed, built and tested them is simply foolish. Sure some modifications and running without emission controls can yield some rotary performance benefits but ultimately (especially with the already high-strung Renesis) any deviation from the recommended is playing with fire IMHO. It is fine if you disagree with me on that, but I have been around a host of these engines and seen them used and abused, torn apart and rebuilt and I do have an experienced perspective on this. Cheers
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Old 01-09-2019, 02:14 PM
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Ah what the heck, why not bump this thread in 2019....

Iíve been a PREMIUM 93 + 0.5oz per gallon premix with Idimitsu kinda guy since I got my Series 1.

This thread got me thinking, so now I wanna try lowering the octane and see how she runs.

Mine has low compression @ 90-ish psi across the rotors, so itís no longer ďhigh compressionĒ. Lol. Wondering what the butt dyno will feel like.

Are there no concreate testing / dyno runs done on this subject to nail this coffin shut? Rotaries have been around since I was born and seems the debate is still going on. why hasnít anyone myth busted this crap yet? Iím shocked.
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Old 01-09-2019, 07:42 PM
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Moderns cars with the piezoelectric ping deterctors will automatically adjust (advance or retard) the spark relative to the eccentric shaft position (or p-p-p-piston position in the cylinder) to prevent knock. When knock is detected (or you disconnec tthe knock piezoelectric sensor) the spark retardation "automatically" yields less power- hence your butt dyno should feel less power. However under certain conditions and compression knocking (pinging) may still occur - not good for any engine.

My knock sensor wiring became lunch for a varmint on my CRV and hence my engine has far less power now, especially when I need to accelerate quickly.

Oh - I use 91-93 octane regularly in the RX8 with some added thick, rich molassesy premix in the gas.
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