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RePOST:Intake,Software, does it really matter? (archive)

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Posted by ///M3 on April 28, 2000 at 00:25:39:

Posted by BOB M3
"Jim C. can "configure" the performance software for various modifications IF is familar with it (the modification) and has run the necessary tests.
I would think the modification/s that would require a different performance configuration would be considered a "major" modification i.e. headers, cam, headwork, larger throttle body, individual throttle bodies, (maybe a HFM), etc.

Bob ///M3"

Well, if we purchase one of the euro kits;ie JC or ECIS, and later add lets say a underdrive pulley or headers... will this effect the ecu? How are we suppose to fully maximize our performance when the chips were pre-mapped for a specif setup?


Posted by Shawn Fogg:

"Yes. You gotta understand how the HFM works. It basically measures the air mass passing through it. It does this by measuring the resistance of a heated film near the center of the meter. It 'tells' the DME what the air mass is basically by using a 0-5v signal to the DME.

Using totally fabricated numbers as an example...

say the HFM internally measures 10 lbs/minute of airflow. It tells the DME this by sending a 2v signal which the DME knows means this equals 10 lbs/minute. Now the airflow is 20 lbs/minute so it sends a 2 v signal which the DME understands what the airflow is. The HFM and DME have the same voltage to air mass 'table' so everthing works.

Now you put on a bigger HFM that has the capacity to measure (and flow) more air. But it still needs to work with the 0-5v spec. Now when the DME is seeing a 1v signal you may actually be flowing 12 lbs/minute of air but the DME is basing its injector opening time thinking that the airflow is 10 lbs/minute and it injects the wrong amount of fuel that in this case would make you run lean.

Sooo.... what the HFM 'chip' does is recalibrate the voltage to air mass 'table' inside the DME. With it in place the DME knows a 1v signal = 12 lbs/minute of air.

Hope this helps,"

So I would guess that both kits have the chipped tuned for everything? I ask this because on JC's kit, they have a re-tuned chip to work with the just the intake. So what about the rest of the stuff in the package?

Thanks all

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