MAP / MAF / Grain of Salt...

[Mark Romans]

It flowed 589 cfm at 11" of vacuum on a superflow 600.  The superflow 600
only flows 600 cfm that's why it would only make 11" of vacuum.  They
provide a chart to tell you what % to multiply by to get the flow at "X"
inches of vacuum.  TPIS's second book has a dyno run where they measure the
cfm of the engine during the run and it only took about 600 cfm to make 400
hp.  I don't think the maf is really a restriction at below 450 hp.  You can
make it measure the air up to peak torque, and from there play with the fuel
vs rpm by watching the 02 sensor and tune it fine.
Mark
-----Original Message-----
From: Greg Hermann <bearbvd at sni.net>
To: gmecm at esl.eng.ohio-state.edu <gmecm at esl.eng.ohio-state.edu>
Date: Saturday, March 27, 1999 11:26 AM
Subject: Re: MAP / MAF / Grain of Salt...


>>Tpis also says a modified maf will flow 750 cfm and I have flowed one on a
>>superflow 600 and modified maf flowed 796 cfm (589cfm at 11").  I show 255
>>grams/sec (Which is the max it will measure) at 4600-4700 rpm's.  As long
as
>>peak torque is below the max flow you should be able to tune the engine to
>>run fine with a 165 ecm.
>>Mark
>
>Be pretty non-productive to put anything as restrictive as an 11" pressure
>drop that you do NOT have to have before a turbo compressor inlet. It just
>serves to increase (fairly impressively) the pressure ratio that the turbo
>must work at in order to make a given level of boost--this makes the outlet
>air hotter, requires a bigger IC, , requires more power out of the turbine
>to turn the compressor, requires more back-pressure on the motor, makes the
>motor run hotter, and makes detonation appear sooner. None of these are
>good things, but you knew that!!
>
>Regards, Greg
>
>