DIY_EFI Digest Tuesday, 17 December 1996 Volume 01 : Number 386 In this issue: Re: Fwd: eddy current brake RE: ALDL Re: oil pumps (not efi) - sorry;) Re: pulse and hold Re: ENGINE TIMING Re: pulse and hold RE: Check out the new diy_efi / efi332 web site! Re: pulse and hold Re: pulse and hold Re: Check out the new diy_efi / efi332 web site! RE: Check out the new diy_efi / efi332 web site! Re: oil pumps (not efi) Re: oil pumps (not efi) Re: pulse and hold Re: Check out the new diy_efi / efi332 web site! sensorless electric motor position detection more fuel pressure Re: more fuel pressure Re: more fuel pressure ABS See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: cloud@xxx.edu (tom cloud) Date: Mon, 16 Dec 1996 08:13:22 -0600 Subject: Re: Fwd: eddy current brake >> Help me understand ..... (I've listened to related discussions re >> ignition control for a while) >> >> I hear the 4 pointed star crank pickup isn't good enough to use >> a PLL to develop nth degree resolution. >> >> Same for the distributor pickup. >> >> So, seems everyone wants to use either the flywheel teeth or a gear >> attached to the cam (maybe even the cam gear??). Is that right? >> [ snip ] >> Use optical pickup sensors with digital outputs and your signal will > have constant amplitude amd mark-space ratio just the period will > change with engine angular velocity. I have used this method on > several motorcycles. > Clearly, with optical there would be no rate effect as with mag sensors, but then you've now got to contend with dirt obscuring the optics. Tom Cloud ------------------------------ From: John Hess Date: Mon, 16 Dec 1996 08:48:23 -0600 Subject: RE: ALDL Here we go again. The ALDL information IS NOT on pins A&B. A is ground. B is 5-6 volts from the Computer. E and/or M is the serial ALDL data. Shorting A to B only has the effect of causing the Check Engine light to flash in a manner that will reveal any trouble codes. The ALDL is a serial bit stream that includes information such as spark retardation, Throttle position, Injector duty cycle, Air inlet temperature, ad nauseum. What you say might be true as far as it goes; but, I don't think that it is a response to the question. I use a Diacom Plus to read the ALDL data. - ---------- From: Daniel Burk[SMTP:ws6transam@xxx.net] Sent: Saturday, December 14, 1996 4:04 PM To: diy_efi@xxx.edu Cc: wbraden@xxx.edu Subject: Re: ALDL Wade: Your ALDL information is on pins A & B, which you get by shorting these pins out with a 20 K resistor, a 10 K ohm resistor, or a 3.9 K ohm resistor depending on the type of system you have. Pin D is where the information comes out, in the form of a lamp level voltage (zero to twelve volts). Your check engine lamp will oscillate with the digital data. If you use a 20K resistor instead of the 10 K resistor, your car runs in "normal mode" instead of the diagnostics mode, but provides the 20 byte data stream anyway. The 3.9 K resistor puts your car in limp-home mode with a backup spark and fuel control map. Give that a try. -- Dan ------------------------------ From: Stephen Dubovsky Date: Mon, 16 Dec 1996 09:53:35 -0500 Subject: Re: oil pumps (not efi) - sorry;) >> >It takes a finite amount of time for heat to transfer from on thing >> >to another. The greater the temp difference, the faster the transfer, but >> >it is still a finite about of time. > >True. ... a lot snipped ... I still think thermo/heat transfer doesn't say this (at the speeds we're dealing w/). If you have a turbulent fluid (for better xfer) at a boundary then all the equations w/ reynolds and prandel (sp?) numbers I can find do not use flow rate in the xfer equation. It WILL however determine the equlibrium temp the fuild reaches. ... >(yes, I admit to being an engineer ) So what's wrong w/ that;) SMD - -- Stephen Dubovsky dubovsky@xxx.edu 95 Yamaha FZR600 83 Porsche 911SC 84 Jeep Cherokee ------------------------------ From: Charles Napier Date: Mon, 16 Dec 1996 08:10:54 -0800 Subject: Re: pulse and hold Sandy wrote: > > Charles > > Do you mean 'peak and hold' style of injector? > > Sandy Sandy, I Beleive that is correct. Charlie ------------------------------ From: Charles Napier Date: Mon, 16 Dec 1996 08:10:01 -0800 Subject: Re: ENGINE TIMING Tuck wrote: > > At 22:18 12/15/96 +0000, you wrote: > >HI there > > > >Having read the articles I can tell you that the most common method used > >now in europe for engine timing is the flywheel sensor with a missing > >tooth in conjunction with a cam sensor. The flywheel sensor has in the > >case of Fords 36 teeth with one missing. The sensor is in line with > > FWIW, the Mazda rotaries use a gear driven crank angle sensor that inserts > in the same place as the dsitributor did on the older rotary cars (in the > front housing on the endinge that also contains the gear/chain-driven oil > pump). I'll bet that it wouldn't be too hard to adaptthe Mazda crank angle > sensor to the distributor mounting on another car with some careful > fabvrication. I think the output signl is pretty straightforward from the > unit. They are also readily available from any 84+ fuel injected rotary car > and practically bulletproff in terms of reliability. > > Justin "Tuck" Cordesman > SOLID BRASS-> She was getting robbed and I was getting blown away... > > It's funny... these days the only sympathy I get is from a woman I tend to > annoy and a would-be assassin. Msd sells a flying magnet crank trigger for around a 100 dollars for several diff aplications. Charlie ------------------------------ From: kleenair@xxx.com Date: Mon, 16 Dec 1996 11:40:05 -0800 Subject: Re: pulse and hold Charles Napier wrote: > > Hi, > > I was wondering if anyone out there knows how to build a pulse and hold > circuit for a chevrolet syle fuel injector? > > Thanks in advance > > Charlie Hi Charlie, You can build it yourself, or you can buy the chip. The driver is available from Cherry Semiconductors (CS453), Motorolla, and SGS (and probably others). It has a ground, 5V signal input, 12 V in, injector coil- and injector coil+. If you want to build your own driver instead of buying the chip (I can't see why other than for fun), write back and I'll find the circuit schematic. Us non-electronics guys can't remember these things off the top of our heads! Best Regards, Mazda Ebrahimi ------------------------------ From: Peter Shoebridge Date: Mon, 16 Dec 1996 11:43:21 -0700 Subject: RE: Check out the new diy_efi / efi332 web site! Looks pretty good, perhaps you should have a go at the diy_efi and efi332 web pages.... I was away this weekend, so I haven't had a chance to test out the gnu-win32 b17 cross-compile tools. Should get to that tonight (yeah right!!!). Peter - ---------- From: Johnny Sent: Sunday, December 15, 1996 9:28 AM To: diy_efi Subject: Check out the new diy_efi / efi332 web site! Howdy, After getting over the feeling that I was borrowing someone else's car to take to the demo derby, I managed to give the old diy/332 website a going over. Well, maybe major remodel would be more accurate. I would like anyone interested to stop by and have a look. WARNING: THERE IS NOW COLOR... LEAVING YOUR MONITOR ON AT NIGHT WHILE TUNED TO THIS WEB SITE MAY PREVENT YOU FROM SLEEPING. Here is a list of what was changed or added: snip begin 600 WINMAIL.DAT M>)\^(A<2`0:0" `$```````!``$``0>0!@`(````Y 0```````#H``$(@ <` M& ```$E032Y-:6-R;W-O9G0@xxx.;W1E`#$(`0V ! `"`````@`"``$$ MD 8`9 $```$````,`````P``, (````+``\.``````(!_P\!````8P`````` M``"!*Q^DOJ,0&9UN`-T!#U0"`````&1I>5]E9FE 8V]U;&]M8BYE;F``(P`0````4```!33510`````!X``S !````(P```&1I>5]E M9FE 8V]U;&]M8BYE;F``$P`0```"4````G9&EY7V5F:4!C;W5L;VUB+F5N9RYO:&EO+7-T871E M+F5D=2<``````@$+, $````H````4TU44#I$25E?149)0$-/54Q/34(N14Y' M+D](24\M4U1!5$4N1415``,``#D`````"P! .@$````"`?8/`0````0````` M```"VDT!!( !`#$```!213H@0VAE8VL@;W5T('1H92!N97<@9&EY7V5F:2 O M(&5F:3,S,B!W96(@ M`' ``0```#$```!213H@0VAE8VL@;W5T('1H92!N97<@9&EY7V5F:2 O(&5F M:3,S,B!W96(@# $````%````4TU44 `````>`!\,`0```!,```!P971E M``@0`0```&4```!, M3T]+4U!2151464=/3T0L4$522$%04UE/55-(3U5,1$A!5D5!1T]!5%1(141) M645&24%.1$5&23,S,E=%0E!!1T5325=!4T%705E42$E35T5%2T5.1"Q33TE( M059%3E1(041!``````(!"1 !````MP,``+,#``!J!@xxx.JJ#_``H! 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($QO-&]K!"!P%Z "0'D@P" Q&N"1$B!W M96(?!4 1P![ 'S 1L6YC'Q!Z=!]@= >0!4 (8!^49RAN=2T#\&X@\6(Q M+C65A:" %$"JA(?4KD"DA[5 2``20(?P*BR!L:3$X, +1:2UX,30T#? ,T"]C M"UDQKC8*H -@xxx.PPP,09&`V$Z,HX#,08,@B!*;VAN;GYY M,B\S/09@xxx.C(X M$W!-\S:O,SU4;SCO-7L?]3S?<3>^=6)J,4$^_S5[0VD6(&-K)G=N!]$?]B\W M(*H`D"8P(2V/+I,S-@xxx.Q *A4$!@#NA*:%T"X#>9R9P M'P`%P!^R9@G@+L#O3-$J$R+4!N!R`V G04S@OR1@!X "(!\0%C 1\"<$(/YC M"L$F``J%`9 D`"G4']'W.W ?8 2!8CL1(M #@2%Q\Q[ )@%G:1\!'[(&\![ M_1_Q+R#E2 (?(TS!"H5-`MTI$%<6,1V0`,!Y.Y!2L=YJ!;$7H 1B`R!W'I-7 M$K,%L!\18V,(,$9P"H6?"X LX29!4Q0F4&]P M)Y _'3 @xxx.3U=A18!/3$]2 M(;$<<$4$059>P2!93U52U0703UZP5& 0(&%0$W B5 >P24=(8@!72(9)8' ^ MP%5.140*A<=A@%\!7W%714(&`&%P,5]034%9++!?0%9%CDYB`&#Q-!!23TT& M`-E@<$507L$A[4A;<5LP]R,16A$F4F8A$"HB(O(EDL]3`@6Q)4 -L&0Z04U* M9.\M[!MO'F #`'!(STG?,15?;<\P!QO5;]T6P0!SD `#`! 0``````,`$1 ` M````0 `',*!?N:F Z[L!0 `(,*!?N:F Z[L!'@`]``$````%````4D4Z( `` ,```#``TT_3<``&N& ` end ------------------------------ From: Sandy Date: Mon, 16 Dec 1996 10:55:10 -0800 Subject: Re: pulse and hold Charlie I have just completed the PCB manufacture of a peak and hold type of driver that will also work to drive an ignition coil. It is for the people on the EFI332 list. Some of the drivers that Mazda mentioned will only drive the saturated High Impedance, 1Amp, type of injectors. The only one that will drive the 4amp peak, 1amp hold is the, Cherry part. The Motorola parts that used to are discontinued, and they only have satruated drivers. I'm not sure about SGS. The circuit that I used has the National LM1949 as the driver for a darlington or an IGBT. The circuit board is approx 2x5 and 4 driver circuits and a voltage regulator. For more info on it, jump on the EFI332 list. The short story is that the boards are $4.35 each plus shipping. A postscript schematic is on the EFI332 ftp site, it is not the most current, but it has the general idea. Also check out the National Semiconductor Web page, they have online data sheets, and I think you still can order some samples right off the web. Sandy Sandy ------------------------------ From: cloud@xxx.edu (tom cloud) Date: Mon, 16 Dec 1996 14:19:32 -0600 Subject: Re: pulse and hold >The circuit that I used has the National LM1949 as the driver for a >darlington or an IGBT. The circuit board is approx 2x5 and 4 driver circuits >and a voltage regulator. For more info on it, jump on the EFI332 list. The >short story is that the boards are $4.35 each plus shipping. A postscript >schematic is on the EFI332 ftp site, it is not the most current, but it has >the general idea. Also check out the National Semiconductor Web page, they >have online data sheets, and I think you still can order some samples right >off the web. > >Sandy Sandy, I would like to have a copy of the current schematic (attach it to mail, if you can). Thanks, Tom Cloud ------------------------------ From: "Johnny" Date: Mon, 16 Dec 1996 13:14:34 -0800 Subject: Re: Check out the new diy_efi / efi332 web site! > From: Peter Shoebridge > Looks pretty good, perhaps you should have a go at the diy_efi and efi332 > web pages.... Peter, those ARE the diy_efi and efi332 web pages!!! Am I missing something here? > I was away this weekend, so I haven't had a chance to test out the > gnu-win32 b17 cross-compile tools. Should get to that tonight (yeah > right!!!). Sounds great. Keep us posted on how it goes. Although, I have to admit, the more I play with Linux, the more I like it. ;-) - -j- ------------------------------ From: Peter Shoebridge Date: Mon, 16 Dec 1996 15:26:56 -0700 Subject: RE: Check out the new diy_efi / efi332 web site! - ---------- From: Johnny Sent: Monday, December 16, 1996 2:14 PM To: diy_efi@xxx.edu Subject: Re: Check out the new diy_efi / efi332 web site! > From: Peter Shoebridge > Looks pretty good, perhaps you should have a go at the diy_efi and efi332 > web pages.... Peter, those ARE the diy_efi and efi332 web pages!!! Am I missing something here? I meant these pages: http://efi332.eng.ohio-state.edu/mirror/ and http://www.cpsc.ucalgary.ca/~fridman/diy_efi/ > I was away this weekend, so I haven't had a chance to test out the > gnu-win32 b17 cross-compile tools. Should get to that tonight (yeah > right!!!). Sounds great. Keep us posted on how it goes. Although, I have to admit, the more I play with Linux, the more I like it. ;-) - -j- begin 600 WINMAIL.DAT M>)\^(@`6`0:0" `$```````!``$``0>0!@`(````Y 0```````#H``$(@ <` M& ```$E032Y-:6-R;W-O9G0@xxx.;W1E`#$(`0V ! `"`````@`"``$$ MD 8`9 $```$````,`````P``, (````+``\.``````(!_P\!````8P`````` M``"!*Q^DOJ,0&9UN`-T!#U0"`````&1I>5]E9FE 8V]U;&]M8BYE;F``(P`0````4```!33510`````!X``S !````(P```&1I>5]E M9FE 8V]U;&]M8BYE;F``$P`0```"4````G9&EY7V5F:4!C;W5L;VUB+F5N9RYO:&EO+7-T871E M+F5D=2<``````@$+, $````H````4TU44#I$25E?149)0$-/54Q/34(N14Y' M+D](24\M4U1!5$4N1415``,``#D`````"P! .@$````"`?8/`0````0````` M```"VDT!!( !`#$```!213H@0VAE8VL@;W5T('1H92!N97<@9&EY7V5F:2 O M(&5F:3,S,B!W96(@xxx. `!`%$! M`2" `P`.````S <,`! `#P`:``$``0`:`0$)@xxx.4$V-C U M-T0P,3%",T4U,#!!03 P,S@xxx.0!@`D!0``% ````L`(P`````` M`P`F```````+`"D```````,`+@```````P`V``````! `#D`,,G8/J#KNP$> M`' ``0```#$```!213H@0VAE8VL@;W5T('1H92!N97<@9&EY7V5F:2 O(&5F M:3,S,B!W96(@# $````%````4TU44 `````>`!\,`0```!,```!P971E M``@0`0```&4````M M+2TM+2TM+2TM1E)/33I*3TA.3EE314Y4.DU/3D1!62Q$14-%34)%4C$V+#$Y M.38R.C$T4$U43SI$25E%1DE 0T]53$]-0D5.1T](24\M4U1!5$5%1%5354)* M14-4.E)%.D-(``````(!"1 !````?P,``'L#``!H!@``3%I&=0??J83_``H! M#P(5`J0#Y 7K`H,`4!,#5 (`8V@xxx.XR!@`&PP*#,@/&!Q,"@Q(S$P]F M- ]Z:&5LT0,@1&QG`H!]"H (S\4)V3L7GS(U-0* "H&##;$+8&YG,3 S%"#7 M"PH2\@xxx.# "T6DM>#$T- WP#- >8PM9,;8V"J #8'0% MD 5 +2"'KPJ''SL,," &1@xxx.`R &#((@2F]H;FY^>2$O(CT&8 (P(V\D M>TUA`B!D87DL%F %D&4;!M $D" ?T"H@,3DY$#8@,CH>8"!033,EKR(]5&\G M[R1[9&FD>5\-P&E !:!U%S E!M N"?!G+B50:6^<+7,!D" P,,!D=2O?<2:^ M=6)J($$M_R1[4HIE-&!#%B!C:R (8&4%0'06("!N!]$OU2"<+R P$1K@$B!W M924@xxx., %$&1G-T \ MHG \TD!A7$^P&$O?@xxx.L\[UTK@=SY /T*P7!! P$PA M!" XL&5KGPGP01%+X$K10G)N)P5 [Q' 0E!"P!&Q;BI@-Q!"\ \@,#%@-M<_ MAV=N=2W%`_!N.(%B,3=>H -@]000+3[1< ,07P(&\#ZP_ST20C(]H# O!" )P3& 8L!+">!P M('YU0%%'X" P0E "($)@;U\'X#D`0-$^H1-P;$?!=;]D4"H@7;1?$EY@2P!T M1Z+^94XU!& 7H$K1"U% P /PYS<@0 `+@'5X:V-L%AW AUT@:3%BP" [+2E8 MW/PM:B$86=\;U2 &3C46P0(`\= MH.N[`4 `"# `">\=H.N[`1X`/0`!````!0```%)%.B ``````P`--/TW``": !=.N[ ` end ------------------------------ From: dave.williams@xxx.us (Dave Williams) Date: Fri, 13 Dec 1996 20:57:00 +0000 Subject: Re: oil pumps (not efi) - -> WRONG. Why the heck would it be called a high volume pump if it - -> didn't pump more volume per revolution?!?!? If you carefully compare - -> the stock pump with a high volume pump, you will note the body of the - -> pump is longer, denoting longer gears in the pump, and thus more - -> swept area of the rotors. More area x same RPM = higher volume. This - -> will equate to higher average oil pressure, all else being equal. - -> The only circumstance the oil pump recirculates is if the filter is - -> allowed to clog up, at which point there is a bypass valve in the - -> block which still allows oil to circulate, albeit unfiltered. For ordinary Ford and Chevy applications there is an internal bypass in the actual pump casting itself. A spring loaded plunger in the bypass short-circuits the flow from the output to the input side of the pump when design pressure is reached. With the same spring, both the standard and high volume pumps will flow the same amount of oil at the same running pressure. None of the "high volume" ever makes it out of the pump. The only time you will ever see a difference between a standard and high volume pump is when the standard pump can't meet its designed pressure. This happens at idle and very low RPM. Past 1500 RPM or so you're pumping far more oil than the engine needs. A constant-volume pump isn't the best choice for high RPM use, but it is mandatory if you want to have oil pressure at low RPM. Some true racing engines like the old BRMs use centrifugal oil pumps which took far less power than positive displacement pumps. However, these engines never had to idle for more than a few moments. The filter bypass valve you discussed has nothing to do with this. ====dave.williams@xxx.us========================DoD#978======= can you help me...help me get out of this place?...slow sedation... ain't my style, ain't my pace...giving me a number...NINE, SEVEN, EIGHT ==5.0 RX7 -> Tyrannosaurus RX! == SAE '82 == Denizens of Doom M/C '92== ------------------------------ From: "William A. Sarkozy" Date: Mon, 16 Dec 1996 21:31:40 -0800 Subject: Re: oil pumps (not efi) > > With the same spring, both the standard and high volume pumps will flow >the same amount of oil at the same running pressure. None of the "high >volume" ever makes it out of the pump. > > This is true, but with all else equal, the high volume pump will develop more pressure at a given RPM, hence it will pump more oil, simply because its pumping more volume through the same clearance space. Bill ------------------------------ From: Charles Napier Date: Mon, 16 Dec 1996 18:52:33 -0800 Subject: Re: pulse and hold Sandy wrote: > > Charlie > > I have just completed the PCB manufacture of a peak and hold type of driver > that will also work to drive an ignition coil. It is for the people on the > EFI332 list. Some of the drivers that Mazda mentioned will only drive the > saturated High Impedance, 1Amp, type of injectors. The only one that will > drive the 4amp peak, 1amp hold is the, Cherry part. The Motorola parts that > used to are discontinued, and they only have satruated drivers. I'm not sure > about SGS. > > The circuit that I used has the National LM1949 as the driver for a > darlington or an IGBT. The circuit board is approx 2x5 and 4 driver circuits > and a voltage regulator. For more info on it, jump on the EFI332 list. The > short story is that the boards are $4.35 each plus shipping. A postscript > schematic is on the EFI332 ftp site, it is not the most current, but it has > the general idea. Also check out the National Semiconductor Web page, they > have online data sheets, and I think you still can order some samples right > off the web. > > Sandy > > Sandy Hi Sandy, Thanks for the reply. How do I find the other list that you mentioned? Who has those boards for sale? Thanks In advance Charlie ------------------------------ From: "Johnny" Date: Mon, 16 Dec 1996 19:43:07 -0800 Subject: Re: Check out the new diy_efi / efi332 web site! Oh...ya. Haven't got there yet. I forgot about Andrew getting a real job and all, and that all of that stuff is still sitting on the ohio-state box. My main focus was to make the FTP sight usable from the web browser. It will be my pleasure to link the FTP sight and real web sight together, but don't expect any miracles until after the holidays. Thank you Peter for pointing that out to me. You know, they say the mind is just the first thing to go... so I should still have a while left. ;-) - -j- As far as the .ca site goes, that's out of my district, but I will add links to it when I revamp the 332 web. - ---------- > From: Peter Shoebridge > > I meant these pages: > http://efi332.eng.ohio-state.edu/mirror/ > and > http://www.cpsc.ucalgary.ca/~fridman/diy_efi/ > ------------------------------ From: Dave Zug Date: Mon, 16 Dec 1996 22:36:38 -0500 Subject: sensorless electric motor position detection I was recently at a trade show (industrial process control equipment) and a vendor had an interesting display.. It was a wheel that you could rotate and a readout that showed position using the signature that the magnet poles made as they spun. I proceeded to rotate the wheel 180 degrees and behold! a reading that was 180 degrees in error! i really didnt expect to fool it, i also could trick its position calculation by quickly passing a mark, then returning it to that mark. Novel idea, needed more time to complete but looks possible if you can overcome the detection of which magnet winding you were looking at. aparrently its cheating if you manufacture a flaw into a motor winding on purpose. I thought you thinkers would be interested in this. anyway, can someone tell me how ABS detects wheel position/movement? (keep this one for the FAQ!) and, is ABS considered EFI related? (be nice) ------------------------------ From: Dave Zug Date: Mon, 16 Dec 1996 22:46:42 -0500 Subject: more fuel pressure I was given a tip on my car's website, that if i "crush" the pneumatic pressure regulator on my 3.1L PFI-T pont. engine, i'll get more fuel for a given vacuum. this is because you'd be loading the spring inside the regulator. I absolutely am NOT going to do this, but does anyone have another way to affect that regulator without buying boosters etc? its ONE thing that my ECM CANT alter, that i'd like to. is it disassemblable? ps I have only 40 psi at idle and 60 psi at WOT. later~ dave @:-)-[--< ------------------------------ From: Jennifer Rose Date: Mon, 16 Dec 1996 21:10:24 -0800 (PST) Subject: Re: more fuel pressure At 10:46 PM 12/16/96 -0500, you wrote: >I was given a tip on my car's website, that if i "crush" the pneumatic >pressure regulator on my 3.1L PFI-T pont. engine, i'll get more fuel for >a given vacuum. this is because you'd be loading the spring inside the >regulator. I absolutely am NOT going to do this, but does anyone have >another way to affect that regulator without buying boosters etc? its >ONE thing that my ECM CANT alter, that i'd like to. is it >disassemblable? > >ps I have only 40 psi at idle and 60 psi at WOT. > >later~ >dave @:-)-[--< > > Hi Dave If your inclined you can disassemble the reg. Braze a 1/4-28 nut to the top of the can. Add a washer-no hole-just a dimple. using correct bolt reassemble reg - - now you have a adjustable reg. Did this on my TPI unit to make it adjustable. Vance ------------------------------ From: Charles Napier Date: Mon, 16 Dec 1996 21:13:15 -0800 Subject: Re: more fuel pressure Dave Zug wrote: > > I was given a tip on my car's website, that if i "crush" the pneumatic > pressure regulator on my 3.1L PFI-T pont. engine, i'll get more fuel for > a given vacuum. this is because you'd be loading the spring inside the > regulator. I absolutely am NOT going to do this, but does anyone have > another way to affect that regulator without buying boosters etc? its > ONE thing that my ECM CANT alter, that i'd like to. is it > disassemblable? > > ps I have only 40 psi at idle and 60 psi at WOT. > > later~ > dave @:-)-[--< Buy an adjustable regulator. Charlie ------------------------------ From: RABBITT_Andrew@xxx.au Date: Tue, 17 Dec 1996 14:12:46 est Subject: ABS >anyway, can someone tell me how ABS detects wheel position/movement? >(keep this one for the FAQ!) similar to crankshaft speed, a toothed wheel with a hall effect or inductive pickup. Easier though, since position detection is not a requirement. >and, is ABS considered EFI related? (be nice) ABS may not be by strict definition, but traction control should be, since it uses the same sensors, but incoporates engine control. If we can talk about oil pumps, then ABS is relatively spot on target :) Andrew Rabbitt ------------------------------ End of DIY_EFI Digest V1 #386 ***************************** 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".