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[cali yaris]

Don't you think running high boost on low octane can cause detonation and damage your motor?

Not with water/methanol. I'm going on 1.5 years on mine (24 psi) and my motor is in great shape. I bet his is doing pretty well too.

[Blown_xa]

Originally Posted by cali yaris

Not with water/methanol. I'm going on 1.5 years on mine (24 psi) and my motor is in great shape. I bet his is doing pretty well too.

Exactly. WMI is the key, plus combined with lower compression ratio pistons high boost is no problem. We have our Time attack tC tuned at 34psi on pump gas with WMI. I'm not sure what my ignition timing is, I haven't looked at my map... I leave that up to our tuner. It is tuned for MBT ( minimum best timing), any good tuner tunes for MBT where any more timing results in no power gain... Beyond that of course knock and detonation occur. I did carry race gas with me when I competed in Ohio for an event this past summer because I wasn't sure if that area had 93 octane. I was prepared to mix.

[Parmas]

Originally Posted by Blown_xa

Exactly. WMI is the key, plus combined with lower compression ratio pistons high boost is no problem. We have our Time attack tC tuned at 34psi on pump gas with WMI. I'm not sure what my ignition timing is, I haven't looked at my map... I leave that up to our tuner. It is tuned for MBT ( minimum best timing), any good tuner tunes for MBT where any more timing results in no power gain... Beyond that of course knock and detonation occur. I did carry race gas with me when I competed in Ohio for an event this past summer because I wasn't sure if that area had 93 octane. I was prepared to mix.

In this case I cannot understand why my dyno tuner suggested racing fuel (109 Octane) above 16 psi ! He suggested to mix 25% racing fuel with 75 % pump gas. I am still undecided though but certainly if I go with mixing fuels I am hoping some increased hp number aswell. What do you recommend?

In our country pump gas tend to vary octane rating so it is a possible reason.