Sale ends todayGet 30% off any course (excluding packages)

Ends in --- --- ---

95 octane vs. 100 octane

Off Topic Discussion

Forum Posts



Tech Articles

If it's not really about tuning or wiring. Then it belongs in here.

= Resolved threads


Hi all

Lets say I have a perfectly tuned fuel/ ignition map for an engine running on 95 octane. How much would you guess I could advance the timing (overall) if I went to 100 octane? Anyone having practical experience with this?

Depends on the car, the compression ratio, boost etc.

On Volvo T5s that I have some experience with I can say that at peak torque (3500-4000) I can run 3-4 deg more timing before the knock control of the stock Motronic ECU starts pulling timing. The rest of the rpm range pretty much the same but most noticeable at 3500-4000.

If the car is not boosted it might not be knock limited anyways so you won't gain anything by using 100 octane instead of 95.

We usually reply within 12hrs (often sooner)

Need Help?

Need help choosing a course?

Experiencing website difficulties?

Or need to contact us for any other reason?