[Shotimes] Re: 76mm MAF with 19# injector calibration

[Alan Fanning]

Thanks to test data from Justin's 80mm Ford MAF, there is comparative data
available between the Ford 80mm MAF and the Pro-M MAF's. These data show the
Ford 80mm MAF and the Pro-M 75mm Bullet to have equivalent pressure drop.
The 80mm Pro-M MAF has less than half the pressure drop of these two, but
the net difference in performance is only a couple of inches of water (where
3-4 inches equals ~1% hp).

I've been trying for a month to get data from Pro-M for the 55mm Ford MAF,
but the best I've come up with is a claim from (Scott's) memory that the
55mm MAF has 15 inches of water more pressure drop at 1100kg/s mass flow
rate than the 75mm Bullet MAF. That would be about 4-5% hp difference, or
roughly half the 22 hp that Scott claimed could be saved vs their 75mm MAF,
so there is a disconnect somewhere. Plus, 1100kg/s is ~540 cfm, way too high
a flow rate for a N/A SHO, so the real world pressure drop difference would
be less. I believe this conclusion is consistent with Jim Kempf's test data
and recent comments.

The claim of highest maximum cfm does beg for data supporting it. and the
cfm rating is a curiosity - it's usually a continuuum (sp?), where pressure
drop just keep increasing with higher flow rates but there are no cliffs. Go
figure...

    Alan

Gary wrote:
> 
> I would suggest calling C&L and asking to talk to Lee to make sure you get
> the information from the source, but what what I understand, and by what you
> call tell just looking at the different MAFs, the 80mm Ford MAF or stock
> 55mm will probably have the highest pressure drop, the C&L should have very
> little pressure drop, and according to Lee, has the highest maximum cfm of
> any of the available MAFs for SHOs.  He did not give me specific numbers
> from their flow-bench test,