a MAF too small

[CSH-HQ]

Sounds like a Voltage to Frequency converter (iat/rpm), and be done with it.
Lot less quessing than anything else I've heard.

Matter of fact the ultimate code would cut the prom baro stuff, and then use 
a 2-3 bar MAP for boost, and a 1 for baro.

Course if ya blow one up using the above it's all tuning errors <g>.......
Bruce




>Here is a cut of the 7165 vette hac:
>
>
>******************************************************
>* Mass Air Flow Tables & Param's
>*
>* DIGITAL MASS FLOW SENSOR
>*
>* Freq range 34 - 150 hZ
>* Period 927 - 437 counts
>* Range 1490 counts
>*
>* table 1 0 - 511 counts, 0 - 22 gms/sec
>* table 2 512 - 767 counts, 22 - 48
>* table 3 768 - 1023 counts, 48 - 82
>* table 4 1024 - 1279 counts, 82 - 135
>* table 5 1280 - 1535 counts, 135 - 206
>* table 6 1536 - 1791 counts, 206 - 255
>*
>*
>*******************************************************
>ORG $069A
>LC69A: FCB 80 ; Ld VAR FOR SCALING LV8 SCALE FACTORS
>; CAL = arg + 64, (16)
>LC69B: FCB 10 ; 1 Sec MAF BURN OFF TIME.
>LC69C: FCB 50 ; 5 SEC MAF BURNOFF DELAY TIME FROM IGN OFF
>ORG $069D
>;----------------------------------------
>; Mass Air Flow TABLE 1
>;
>; TBL = gms/Sec * 11.1
>;
>;----------------------------------------
>LC69D: FCB 23 ; TABLE SCALAR
>LC69E: FCB 8 ; 9 LINE TBL
>;----------------------------------------
>; gms/SeC BIN VDC #/HR
>;----------------------------------------
>FCB 0 ; 0.0 0 0.00 0
>FCB 36 ; 3.2 64 0.18 25
>FCB 50 ; 4.5 128 0.37 35
>FCB 69 ; 6.2 192 0.55 48
>FCB 93 ; 8.4 256 0.73 65
>FCB 121 ; 10.9 320 0.91 84
>FCB 155 ; 14.0 384 1.10 108
>FCB 197 ; 17.7 448 1.28 137
>FCB 248 ; 22.3 512 1.46 172
>;----------------------------------------
>;----------------------------------------
>*** tables 2 - 5 in here ***********
>;----------------------------------------
>; Mass Air Flow TABLE 6
>;
>; TBL = 1.00 * gms/SEC
>;
>;----------------------------------------
>LC6D4: FCB 255 ; TBL SCALAR
>LC6D5: FCB 16 ; 16 LINE TBL
>;----------------------------------------
>; gms/SeC BIN VDC #/HR
>;----------------------------------------
>FCB 207 ; 206.2 1536 4.39 1591
>FCB 213 ; 212.2 1552 4.43 1637
>FCB 219 ; 218.1 1568 4.48 1684
>FCB 226 ; 225.1 1584 4.53 1737
>FCB 233 ; 232.1 1600 4.57 1791
>FCB 240 ; 239.1 1616 4.62 1845
>FCB 248 ; 247.0 1632 4.66 1906
>FCB 255 ; 254.0 1648 4.71 1960
>FCB 255 ; 254.0 1664 4.75 1960
>FCB 255 ; 254.0 1680 4.80 1960
>FCB 255 ; 254.0 1696 4.85 1960
>FCB 255 ; 254.0 1712 4.89 1960
>FCB 255 ; 254.0 1728 4.94 1960
>FCB 255 ; 254.0 1744 4.98 1960
>FCB 255 ; 254.0 1760 5.03 1960
>FCB 255 ; 254.0 1776 5.07 1960
>FCB 255 ; 254.0 1792 5.12 1960
>;----------------------------------------
>
>
>Bob
>
>-----Original Message-----
>From: owner-gmecm at esl.eng.ohio-state.edu
>[mailto:owner-gmecm at esl.eng.ohio-state.edu]On Behalf Of CSH-HQ
>Sent: Friday, July 23, 1999 3:24 PM
>To: gmecm at efi332.eng.ohio-state.edu
>Subject: Re: a MAF too small
>
>
>I'd look real close at what the min rate the MAF will accurately sense 
>before, running out and buying injectors to try this.
>  I thought the Hacs showed a min, and max frquency?.
>Bruce
>
>
>
>
>>At 01:18 AM 7/22/99 -0800, you wrote:
>>>Isn't the problem not that your maxing the MAF sensor, but that you are
>>>maxing the computers internal airflow variable at 255 g/s?  It's a
>>>frequency MAF, right?
>>>
>>
>>The 1986 to 1989 Corvette, Camaro and Firebird use a Bosch MAF sensor that
>>is a 0 to 5 Vdc sensor not a frequency type sensor (like that used on the
>>1994 and newer Corvette, Camaro and Firebird).
>>
>>One thing you can try is using two stock MAF's is parallel with the ECU
>>only connected to one MAF (but air flowing through both) and then using an
>>injector twice the size the computer thinks it is. It is VERY important to
>>design the air intake so that the same air flow goes to both MAF's - test
>>it on a flow bench with a voltmeter if possible.
>>
>>
>>Jason
>>
>>
>