DIY_EFI Digest Sunday, September 26 1999 Volume 04 : Number 547 In this issue: Typical ignition timing response to throttle snap? So who blows up all those engine? part 2 Re: CHEAP MULTIMETERS See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Sun, 26 Sep 1999 16:21:24 +0100 From: Ade + Lamb Chop Subject: Typical ignition timing response to throttle snap? At 05:00 26/09/99 -0400, DIY_EFI Digest wrote: >------------------------------ > >Date: Sun, 26 Sep 1999 00:49:35 EDT >From: PHXSYS@xxx.com >Subject: Typical ignition timing response to throttle snap? > >HI everyone > >I was wondering what effect rapid throttle movement has on ignition timing. > >I know that extra fuel is injected when the throttle is quickly depressed to >improve throttle response. Are there any ignition timing events that occur at >the same time to also improve throttle response? > >Do you get a little extra advance during TPS event or what? Not sure about Efi Systems but on a normal dizzys you just have centrifugal (rev related) advance and vac advance (throttle positon/rev related). I know that you don't need vac advance, all it does is improve part throttle fuel ecconomy. On the Rover Mini Mpi system water temperature is also taken into consideration... It also uses the MAP sensor (equiv of centrifugal) and the CPS (crank positon sensor) to get the engine speed (centrifugal advance). It also uses a cam postions sensor 'to run in sequential fueling mode' Is this mode where it learns what fuel it should be putting in from the Heated oxygen sensor? Why would it need to know where the cam is to run in the mode? It also measures the actual cam period.... Why does it need to know the actaul cam period? HTH, Thanx, Ade ------------------------------ Date: Mon, 27 Sep 1999 03:51:19 +1000 From: Phil Lamovie Subject: So who blows up all those engine? part 2 Hi All, A while back I asked the question "so who do think is responsible for all those F1 engine blowups. The machine programmer who cant tell a thou from an inch or the software engineer with a bug ? So you all thought I was being silly. 24 Sept. 1994 Motor sport News "How long's the warranty ?" was the question being asked by Mercedes Benz Champ Car customers in Vancouver with no fewer than 12 of the silver star engines blowing during practice and qualifying. Carl Hogan was the biggest warranty claimant, losing five engines alone. Apparently the cause came down to a new "experimental" Mercedes/ Magnet Marelli electronic (sic) mapping system which proved to go disastrously wrong New engine mapping was installed for race day with no engine failures being experienced. Hands up who can say C++ yours in real time, Phil Injec Racing ------------------------------ Date: Sun, 26 Sep 1999 14:44:25 -0400 (EDT) From: sg43@xxx.edu Subject: Re: CHEAP MULTIMETERS speaking of cheap multimeters, r there alternatives to the fluke handheld o-scope that r cheaper? or does anyone have a source for cheap fluke's? sihao ------------------------------ End of DIY_EFI Digest V4 #547 ***************************** 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".