[Diy_efi] MAF calibration
Heath, Tom
theath at plasticart.com
Sat Aug 17 00:05:02 GMT 2002
Forgive me if this has been discussed before. I'm a newbe here, but I have
been searching for several days now with no success.
Here is what I'm doing:
94 Ford 2.0L, EEC-IV ecm, with a MAF. I'm going to turbo this engine.
I believe the trick to compensate for larger injectors is to recalibrate the
MAF sensor. Now, I'm a mechanical engineer, so changes to the ecm program
are beyond me at this time.
I calculate that I need 300cc/min injectors, this is 36% larger than the
original 220cc.
Question 1) Has there been any work done on a DIY MAF recalibration?
Question 2) Is a change to the basic MAF size a viable alternative (see
below) or is my logic flawed?
By doing some quick air flow calculations CFM=(CID x RPM x .5 x
Ev)/1728
Alternative 1, maximum air flow
I find that a MAF from a 3.8L (Taurus) should flow the required
maximum 230cfm I need with a pressure ratio of 1.54 on the 2.0L. However,
at idle the cfm is 89% different (46.8cfm for the 3.8, and 24.7 for the
2.0).
Alternative 2, idle CFM plus 36%
Solve for CID at idle plus 36% CFM (to compensate for increased
injector size) is approximately 166CID (or 2.7L).
Thanks for your help.
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