Black1990jeep
NAXJA Forum User
- Location
- california
I have Renix 4.0 inline six motor in my 1990 XJ. It has a knock sender. Is the timing advanced such that use of 91 octane verses 87 octane fuel makes a difference as far as maximum advance is concerned, or is the the system fully advanced already using the 87 octane?
On last road trip switched from 91 to 87 verses last road trip. Subjectively it seemed I might have had less power, but it is a very subjective measure, different routes even.
Anyways, does the ecu max out the advance using 87 octane under normal conditions, or would 91 octane allow the ecu to give more advance? If no, then I will stick with 87 octane, california gas is too expensive, paid over five bucks at one station, for 87 octane!
Thanks
On last road trip switched from 91 to 87 verses last road trip. Subjectively it seemed I might have had less power, but it is a very subjective measure, different routes even.
Anyways, does the ecu max out the advance using 87 octane under normal conditions, or would 91 octane allow the ecu to give more advance? If no, then I will stick with 87 octane, california gas is too expensive, paid over five bucks at one station, for 87 octane!
Thanks