"Flex timing didn’t support negative timing." Please explain

[tryingbe]

I searched, and didn't find any more info.

Main changes since pre-3.4.3 beta 2
Bug fixes:
Flex timing didn't support negative timing. (Signed vs. unsigned

http://www.msextra.com/forums/viewtopic ... ng#p501331


Does this mean if I put negative value in timing addition in the Flex Fuel Sensor Settings in the current 3.4.2 release Firmware, the negative timing will not be added?

Thanks.

[jsmcortina]

Yes, the current release firmware does not support removing timing with flex.

But why do you want to have negative timing anyway? You should be ADDING timing - surely?

James

[tryingbe]

Yes, the current release firmware does not support removing timing with flex.

But why do you want to have negative timing anyway? You should be ADDING timing - surely?

James

Thanks for the reply. I'm new at MS.

The fuel in the tank of my car is currently E54, and I want to tune it with it. (Arizona outlawed E85) So, 54% would be my "Baseline Ethanol%" in the Flex Fuel Sensor Setting, right?

If I am forced to use octane 91 gas, I need to set MS to take fuel out and also subtract spark timing. Correct?

[rickb794]

Use table switching?