DIY_EFI Digest Monday, November 1 1999 Volume 04 : Number 616 In this issue: RE: Source sought for Bosch connectors Re: DIY_EFI Digest V4 #608 Injectors Acc Enrich 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 12:45:43 -0000 From: "Rich M" Subject: RE: Source sought for Bosch connectors >Date: Fri, 29 Oct 1999 15:53:30 -0700 >From: Thomas Washburn >Subject: Source sought for Bosch connectors >Hi all, >I'm looking for a source of Bosch-style electrical >connectors, compatible with those used throughout >L-Jetronic injection systems. Any help appreciated >Thanks, >- - Tom The connectors are manufactured by AMP and designated "junior timer" or "junior power timer". The two are inter-changeable, but the power timer version is better;the terminal design is a lot more robust. Note though that the terminals are not interchangeable across ranges - only use "power timer" terminals in "power timer" housings and vice versa. Sizes covered include 2,3,4,5,7 way and also larger 15,25 and 35way which are used on the ECU (25 for Ljet) Part numbers for power timer housings: 2way - 282189-1 3way - 282191-1 4way - 282192-1 5way - 282193-1 terminals available with a variety of finishes and wire size compatibility. Check www.AMP.com for more details and part numbers for other examples. This doesn't answer the original question though! - where from?? In the UK I know they are available from Fuelparts UK. They have a website, but I don't have the details to hand - something like www.fuel-parts.co.uk ?? I think Delphi Packard do an equivalent range - at least for some examples (2way injector connector for sure). Hope this helps Rich ------------------------------ Date: Mon, 1 Nov 1999 11:11:19 -0500 From: Scott_Hay@xxx.com Subject: Re: DIY_EFI Digest V4 #608 There are a couple of ways to test: MAP - Apply 5v+ and ground and then apply a vacuum. Watch the change in the signal line. Depending on the type of MAP, the starting reading will vary depending on your altitude (barometric pressure). Most start out somewhere around 4.6-4.9v w/no vacuum. A very crude bench test for an o2 sensor is to mount it in a vise and heat it with a propane torch. As it warms up, it will begin to produce a voltage. Not very accurate but it will indicate if it is completely dead. DIY_EFI-Digest-Owner@xxx.edu (DIY_EFI Digest) on 10/28/99 12:00:00 PM Please respond to diy_efi@xxx.edu To: DIY_EFI-Digest@xxx.edu cc: (bcc: Scott Hay/Mobile/Toyota) Subject: DIY_EFI Digest V4 #608 DIY_EFI Digest Thursday, October 28 1999 Volume 04 : Number 608 In this issue: DIY MAP & O2 Testing? See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. - ---------------------------------------------------------------------- Date: Thu, 28 Oct 1999 08:32:58 From: Bob Tom Subject: DIY MAP & O2 Testing? Are there DIY ways of testing if a MAP sensor and an O2 sensor are functioning up to snuff? Thanks in advance. Bob. Southern Ontario, Canada. '97 FR CC Sport, 5.2L, 3.55 SG, auto. Racing weight: 4,350lb ET: 14.934 Trap speed: 90.78 mph - ------------------------------ End of DIY_EFI Digest V4 #608 ***************************** 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". ------------------------------ Date: Mon, 01 Nov 1999 10:10:37 -0600 From: "Christian J. Knudstrup" Subject: Injectors Does anybody have any thoughts on which are the best injectors to buy and which are best for the money for a Multi Port sequential fuel injection system? Project 68 'cuda 383 big block approx 500 hp 400 fp of torque. Controller Home built 68332 processor and driver board can handle either high or low resistance and peak/hold type. The injectors can be anything due to the system design is completely fabricated by me. Oh electronic injectors only please. Thanks for all the help Christian J. Knudstrup ------------------------------ Date: Tue, 02 Nov 1999 04:15:54 +1100 From: Phil Lamovie Subject: Acc Enrich 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 ------------------------------ End of DIY_EFI Digest V4 #616 ***************************** 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".