Quote:
|
Originally Posted by PhatWeasel
Here's the advantage I understand the ECUtune module gives for switching between 87 and 91 octane modes.
The base timing tables start closer to where thay should be for the two different fuel ratings. You can run 87 octane in a stock SVX, but the computer takes a while to tune the knock out. When 91 octane is used after the ECU has adjusted to the 87, performance will be degraded until the ECU slowly reprograms itself to the higher octane. The ECU is very leary of advancing timing so it does so cautiously, taking some time to reach optimal performance when the engine is back on the good stuff. The ECUtune chip provides timing tables closer to stoich for each octane rating and thus keeps the computer from tuning too far and dramatically reduces re-tuning time between octane changes.
Or so I believe.  |
Running 87 octane in an SVX without the chip is a big no no