DIY_EFI Digest Tuesday, November 2 1999 Volume 04 : Number 617 In this issue: >Subject: Source sought for Bosch connectors injectors for 500 horsepower Re: DIY_EFI Digest V4 #616 non-DFI tach question See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Mon, 1 Nov 1999 11:52:13 EST From: RSRACE@xxx.com Subject: >Subject: Source sought for Bosch connectors >I'm looking for a source of Bosch-style electrical >connectors, compatible with those used throughout >L-Jetronic injection systems. Any help appreciated >Add me to the list of those looking for a source, but add connectors for a >D-Jetronic to the list of needs!! I believe AMP is the supplier for connectors for the bosch systems. You can try them directly or someone who carries AMP products. Tom ------------------------------ Date: Mon, 1 Nov 1999 14:47:23 -0800 From: "Carl Summers" Subject: injectors for 500 horsepower Hi, There is a place in Colorodo which sells a 36lb injector part # 500-1031(around $30.00 ea.) phone number 970-245-5949 it is a high impedance injector....they also have a 40lb (500-1030) for same price...hth's - -Carl Summers ------------------------------ Date: Mon, 1 Nov 1999 16:46:28 -0600 From: nacelp@xxx.com (CSH-HQ) Subject: Re: DIY_EFI Digest V4 #616 Is this univerally true for the gm ecms?. Grumpy > >Hi All, > >Here's a simple method of calculating the required extra fuel for >sudden load >changes that will appeal to the programmers amongst us. > >This supposes that you are running speed/density from a fuel table. > >The TPS reading is taken from the A/D and placed on a stack. >This is done say 10 times every say 10 msec until a "history" of TPS >is >available. > >As soon as a new reading is placed on the stack you do a 1st minus >last to give delta TPS. If the number is equal to the max. possible >delta you inject 100% of the Variable AccEnr ms adding it to the Full >Load fuel ms for that RPM. > >If its say 40 counts you add 40% of the AccEnr to the next injection. >Some ECU's calculate the proportion lost to some cylinders due to >their position in the cycle and add that to the next injection after >that. This is due to the fact that when ever you inject it is only >half the fuel that is supplied per >rev of the engine and some cylinders will only get 50% of the >enrichment. > >This is also true if the result is negative you can subtract the >inverse and avoid the over rich "puff" that you get when the throttle >is closed suddenly > >As you can see we are assuming that as the throttle is translating >rapidly the MAP sensor will be reading close to atms very "SOON" thus >we are using throttle translation as a predictor of ultimate load. > >Now of course the algorithm for the decay of the AccEnr is something >that you didn't ask about but suffice to say you could make it a >variable based on the rate of change of RPM and the starting RPM and >the current load. There is quite a difference between "stabbing "the >throttle to change down a gear and flooring your Acc in gear. > > > Phil >Injec Racing ------------------------------ Date: Mon, 1 Nov 1999 22:40:56 -0500 From: brucep@xxx.net Subject: non-DFI tach question I've searched high and low and haven't been able to find any info that was of any use on this subject so I am turning to the "minds" of this group. I am building a steady state dyno and need to add a tach to it. I want to measure the shaft speed of the dyno. (I don't want to read the engine ignition) I can't afford a digital tach setup so I am looking to use a analog 4 cylinder tach I have laying around till I can afford to upgrade. What would be the easiest way to make this work? Does the tach sense the drop of the ground when the points open. Could I use parts from a GM 4 cylinder HEI coil ie: coil pickup and ignition module. I think I am headed in the right direction just need some advice on different ways I could do this. Ideally I would like to have a digital display which would allow me to have a more realistic reading of rpm's as opposed to well it looks like it is 2000 not 2010, 2020 or 2050. Any help would be greatly appreciated. And sorry for taking up bandwidth for the non-dfi post but this was my last place to ask . . . thanks in advance. Bruce ------------------------------ End of DIY_EFI Digest V4 #617 ***************************** 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".