a MAF too small

[EFISYSTEMS at aol.com]

Hi Dave,
        Is your system a draw through or (blow?)flow through on the MAF?????? 
 If it is a draw through you might be losing adiabatic efficiency caused by 
the vacuum situation at the inlet,,,,,creating heat, losing efficiency, even 
though the boost might show high enough, the mass just isn't there.....but if 
yours is a blow through(I hope the screens are there) I would like to be 
involved if you are interested in trying to use a syclone code running a 
separate computer as a fueler,,,,,,hmmmm another thought,,,I think we could 
even do the spark in 2 or 3 bar and leave your stock computer (165) just to 
handle the fueling till the MAF runs out,,,,,btw where did you find a kit for 
that year or was it homemade???????
-Carl Summers

In a message dated 7/21/99 11:31:47 AM Pacific Daylight Time, 
dzug at delanet.com writes:

<< Subj:	 a MAF too small
 Date:	7/21/99 11:31:47 AM Pacific Daylight Time
 From:	dzug at delanet.com (Dave Zug)
 Sender:	owner-gmecm at esl.eng.ohio-state.edu
 Reply-to:	gmecm at efi332.eng.ohio-state.edu
 To:	gmecm at efi332.eng.ohio-state.edu
 
 Heres a brief intro to my project, for those new:
 
 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.
 
 The definite solution is to go to a MAP system. I dont want to hack 
 the wiring apart and have to use a binary that I'm not skilled enough 
 at to tune from scratch.
 
 Heres my thoughts as to a solution to the MAF max problem: 
 
 If I drill holes PAST the maf sensor, effectively forcing it to 
 read 75% of the actual air entering the engine.. I can alter the MAF 
 tables to re-compensate. If it works, I can wrap foam around the 
 holes and lube with K&N oil for now.. until I can get a pipe made.
 
 Voila.. don't have to buy a twin MAF, dont have to use a translator, 
 don't have to go to a MAP system. only trouble is at idle, the
 resolution might make idle quality suffer. If (there should be) 
 there is a fairly linear relationship between volume thru the 
 sensor and unmeasured volume into the "post sensor holes" or larger 
 single  "post sensor hole", it should work.  one snag is the 
 difference between the filter restrictions but it may be neglidgable 
 enough to tweak the MAF values at WOT manually using an EGT or O2..
 
 
 Am I missing an easier solution? Do I even really care what's going 
 on at WOT above 3000 rpm?  I MAY max the MAF at 70% TPS and 3500 rpm 
 so my thinking is I DO care.
 
 I have a few more days and I'll have the alum heads, 28# 
 Buick GN injectors (12.7 ohms (??)) and new fuel pump on so the 
 problem is about to get worse.  PS I blew the head gasket probably 
 from being lean so my mission is that much more critical now with 
 1200$ heads to warp 8-(
 
 Dave Z. www.delanet.com/~tgp
 
  >>