DIY_EFI Digest Wednesday, September 15 1999 Volume 04 : Number 525 In this issue: Re: Bailey meter Re: humidity cal. Re: Vapour Pressure Re: DIY_EFI Digest V4 #524 Re: Low impedance waste spark coils? See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Tue, 14 Sep 1999 20:01:13 +0000 From: "Alex C. Peper" Subject: Re: Bailey meter The Bailey A/F meter has a long history. Was the meter to use 40's-70's before Horiba in 78 The one I used worked with pure H2 gas. alex > > Date: Mon, 13 Sep 1999 13:49:21 -0600 > From: Scott Beltz > Subject: Bailey AFM-1 wide band O2 system for tuning (SpeedBrain) > > Sorry for the cross post but I need input from anyone who has experience > with wide band 02 systems especially the Bailey AFM-1. I am thinking > about buying one because here in Denver the Dyno shops do not have a > wide band systems. They only use the dynos to check for horsepower > improvements. I have recently purchased a Speedbrain to fine tune my > supercharged 5.8 SN95. I have been using Chris Johnson's chips for > awhile but wanted more control of the system without having to re-burn > and change chips. I have heard that there are some private individuals > here in Denver that have wide bands for tuning there own cars but have > not been able to talk with them yet. My question is with the quality of > the Bailey AFM-1. This product is selling for about $1100 while the > Lambda Meter and others are over $5000. Some information on the Bailey > can be found on APE's WEB site. If anyone has experience with these Wide > band systems please let me know what your thought are. I do not want to > spend $5000+ for a system that with be used for my private use but also > do not want to spend $1100 for a POS. > > Any help will be appreciated, Thanks > > Scott Beltz > Alex C Peper http://www.obd-2.com ------------------------------ Date: Tue, 14 Sep 1999 20:01:13 +0000 From: "Alex C. Peper" Subject: Re: humidity cal. //humidity equations units inHg and F double satH20pres(double temp) { double c[6]={-4.14483e-3,5.76645e-3,-6.32788e-5,2.12294e-6,-7.85415e-9,6.552 63e-11}; double q; q = poly( (double)temp,5,c); return (q); } double Ferrel(double Tw, double Td, double Pb) { double Pw,Pv,A; A = 3.67e-4 * ( (1+ (0.00064 * (Tw-32) ) ) ); Pw = satH20pres(Tw); Pv = Pw-(A * Pb * (Td-Tw)); return (Pv); } double absHum(double Tw, double Td, double Pb) { double H,Pv; Pv = Ferrel(Tw,Td,Pb); H = (4347.8 * Pv) / (Pb - Pv); return (H); } double HumCf(double Tw, double Td, double Pb) { double H,Kh; H = absHum(Tw,Td,Pb); Kh = 1/( 1- ( 0.0047 * (H-75) ) ); return (Kh); } double relHum(double Tw, double Td, double Pb) { double Pv, Pd,R; Pv = Ferrel(Tw,Td,Pb); Pd = satH20pres(Td); R = Pv / Pd * 100; return (R); } Alex C Peper http://www.obd-2.com ------------------------------ Date: Wed, 15 Sep 1999 11:05:38 +1000 From: Stuart Baly Subject: Re: Vapour Pressure >Date: Tue, 14 Sep 1999 09:00:56 -0700 >From: "John Dammeyer" >Subject: Vapor Pressure [snip] >But that does bring up an interesting point. Al Grippo, in his paper where he >shows how do derive pulse width, aludes to 3.1Kpa correction for vapor pressure >in the intake manifold, assuming 75% humidity and 85F temperature. Now, will >this be the vapor pressure of the gasoline as it changes state from liquid into >gas or water as it expands in the manifold? At 85F and 75% RH, the water vapor pressure is indeed 3.1kPa. But I'd almost wager that in the manifold, the vapor pressure will be less than ambient i.e. it will be 3.1*(MAP/atmospheric pressure), given that water vapour is throttled just the same as the rest of the air. [snip] >In the Grippo (and Bowling) formulas the larger the vp the smaller the pulse >width. This probably implies that some of the pressure measured by the MAP >sensor is due to water content vapor pressure and therefore there is less oxygen >in the air charge for combustion and so less fuel is needed. Question is, how >much of an impact would that really make if the fuel injection system is tuned >sitting at the edge of the Pacific Ocean with perhaps 80%RH and then run inland >where the RH for the same ambient temperature is only 30%. For that matter, >what happens when the engine is run when the temperature equals the dew point >(fog in the air)? This is something I hadn't thought of before. e.g. at 0C, RH=60%, water vapour pressure=0.37 kPa at 35C, RH=100%, water vapour pressure=5.6kPa in other words, about 5% difference in the oxygen content of the air. You don't actually need fog for the RH to be 100%. The RH will be 100%, or very close, every time it rains. 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M`````P`1$ $````#`( 0_____T `!S"@!^Z0%/^^`4 `"#"@!^Z0%/^^`0L` M`( (( 8``````, ```````!&``````.%`````````P`"@ @@!@``````P `` M`````$8`````$(4````````#``6 "" &``````# ````````1@````!2A0`` MMPT``!X`)8 (( 8``````, ```````!&`````%2%```!````! ```#@N, `# M`": "" &``````# ````````1@`````!A0````````L`+X (( 8``````, ` M``````!&``````Z%`````````P`P@ @@!@``````P ```````$8`````$84` M```````#`#* "" &``````# ````````1@`````8A0```````!X`08 (( 8` M`````, ```````!&`````#:%```!`````0`````````>`$* "" &``````# M````````1@`````WA0```0````$`````````'@!#@ @@!@``````P `````` M`$8`````.(4```$````!`````````!X`/0`!`````0`````````#``TT_3<` #`$H< ` end ------------------------------ Date: Tue, 14 Sep 1999 23:39:56 -0600 From: Scott Beltz Subject: Re: DIY_EFI Digest V4 #524 The address for APE is: http://www.gothorsepower.com/ > ------------------------------ > > Date: Tue, 14 Sep 1999 11:12:27 -0700 > From: "Jacky" > Subject: Re: Bailey AFM-1 > > What is the address for APE's web site? > > Jacky > ------------------------------ Date: Wed, 15 Sep 1999 16:51:27 +1000 From: Peter Gargano Subject: Re: Low impedance waste spark coils? > Date: Mon, 13 Sep 1999 09:46:07 -0700 > From: "Clay Buccellato (Anthony)" > Subject: Low impedance waste spark coils? > > Does anyone know of a good source for hot, low impedance, > distributorless coils? I just got my (old 1500 flat 4) Alfa-Sud going with the two coils from a HONDA CB1000 (from a motorcycle wrecker) using MJ10012 driver transistors and an optical distributor (well, now just sensor) of my own design. Each coil is mounted beside a head, so one plug lead is about 3 inches long and the other is about 30 inches. These coils are less than 4 ohms (does this constitute low impedance?) and are just perfect for the job. They are actually made in Japan by "TEC" and have type number "FW82-TR1". The CB1000 assembly also had 2 nice brackets I used unmodified, and another requiring a bit of hacking. The mounting also acts as a heatsink, although I don't think heat buildup would be a problem. Interestingly, I seem to have a lot less AM RFI with this setup (what? no-one listens to AM anymore!). regards, Peter Gargano ------------------------------ End of DIY_EFI Digest V4 #525 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".