a MAF too small

[CSH-HQ]

If you want to do something like this then just cut the MAF guts out, and 
reinstall inna new housing, and recal..  
Bruce

>| I have an 89 5.7l Iroc, 165 ECM, ARAP (vette) binary. I have put a
>| supercharger on it and the computer has no idea what airflow is
>| coming in after about 3000 rpm cause the MAF reads 255 right about
>| there.
>
>When you double the airflow into a MAF based system, the MAF will of
>course max out at about 1/2 of redline, so what you are experiencing is
>a reasonable "irritant" considering what you have described.  There are
>many ways to fix this, one is to recode the eeprom in the ECM, one is to
>play with fuel pressure, change mafs, and do other funky stuff, however
>there is an easier solution.  Someone either here or on another list
>mentioned this to me, I ignored and discounted it, but after testing it,
>success was achieved.
>
>Create a bypass for the MAF.  Simply run a tube at a 30 degree angle off
>the pre-maf tube, connecting to the post-maf tube, also at a 30 degree
>tube.  By increasing the diameter of this tube, less air will go into
>the MAF, thus produce a lower reading.  I did this successfully by
>doubling the airflow, doubling the fuel injector size, and it worked
>well, except at idle.  Idle would rock between rich/lean/rich/lean and
>become annoying.  The solution to that was to have a spring loaded lever
>on a valve that reduced the airflow in the bypass tube during idle, and
>open the second you tap the gas.
>
>Took a lot of tuning as far as hose diameter, playing iwth the valve,
>and the car in question still idles a little strange, however when the
>supercharger kicks in, its a blast to drive.  Also, there were no
>modifications to the ECM or the wiring harness, which makes it easier
>for people who don't have the ability to rewire or change code.
>
>Hope that helps.  Before you change things around, you have to do some
>math... I just said "double the injector size" and that might be way
>off, it was merely to illustrate the concept more than anything :)
>
>
>-- 
>
>Frederic Breitwieser
>Xephic Technology
>769 Sylvan Ave #9
>Bridgeport CT 06606
>
>Tele: (203) 372-2707
> Fax: (603) 372-1147
>Web: http://xephic.dynip.com/
>