Quote:
Originally Posted by RedFRS4me
Has anyone tried 93 tune with lower octane? 91/92?
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The tune will work but you will get knock, the ecu will then pull timing across the entire rpm range to protect the motor from damage. IAM will be reduced to less than 1. The ecu is quite agressive in pulling timing and generally pulls more than it needs to for safety. This results in a reduction in power and torque. The ecu is always trying to return the lost timing so it will cause the engine to knock then pull the timing again, it probably not the best situation to be in for long periods.
The 91 tunes are optimised for 91 and should in theory produce a better result ie power and torque wise than a 93 tune running on 91.
If you run the correct tune for the fuel you are using their should be little or no knock and the ecu will not have to intervene to pull timing constantly.
Once you put the correct fuel back in the ecu will no longer detect knock and the timing will be restored as well as power.
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