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speed density

General questions and chit-chat about the ECU+.

speed density

Postby cal0807 » Wed Oct 06, 2010 5:38 pm

I'm getting ready to flash my 98 ecu for speed density. Will it still be possible to use the ecu plus for my fine tuning since it uses the mas signal
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Re: speed density

Postby tlcoll1 » Wed Oct 06, 2010 6:34 pm

I don't think so. SD should bypass the MAS signal completely.

Tom
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Re: speed density

Postby cal0807 » Wed Oct 06, 2010 9:00 pm

That's what I figured. Thanks for the quick reply.
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Re: speed density

Postby dsmarmy777 » Sun Aug 21, 2011 10:11 am

So does this still apply even if i were to have speed density setup in my 98/99 ecu? and just leave it alone (stock) in ecu plus?
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Re: speed density

Postby tlcoll1 » Sun Aug 21, 2011 10:18 am

I don't know exactly how SD in the stock ECU works, but I assume it bypasses the MAS completely. With this, the MAS-related settings in the ECU+ (including fuel tuning) wouldn't have any effect.

Tom
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Re: speed density

Postby da1sexmonk83 » Tue Sep 25, 2012 2:12 am

When you have speed density they change the code in the edu to understand the correlation between a map sensor and the temperature sensor. These sensors have all new fuel values.

Changing settings in the ecu+ would modify the signal being seen by the ecu either from the map or temp. The ecu+ would under normal circumstances increase fuel by 1% when set to, would no be altering fuel by an unknown value.

A way around this would be for the ecu+ software to also have tables for speed density. It already has the ability to read a map sensor. If it knew what value on the map/temp combo that increased/decreased fuel by X% then it could alter voltage to the map to tweak fuel. in the same manner as the mas. This would be much like the way the maf is done vs the stock mas.
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