DIY_EFI Digest Wednesday, October 20 1999 Volume 04 : Number 592 In this issue: Luftmeister EFI for BMW Boxer twin Motorcycle Re: DIY_EFI Digest V4 #591 Re: DIY_EFI Digest V4 #590 See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Wed, 20 Oct 1999 10:47:02 +0000 From: bmoseley@xxx.com (Bob Moseley) Subject: Luftmeister EFI for BMW Boxer twin Motorcycle I have a "luftmiester" efi system which I bought s/hand at an autojumble. The ECU is stamped Haltech. I am not entirely sure it is complete. It has two sensors, one to a throttle body and one to a cylinder head. There are 4 three pin din type leads on the harness of which these two sensors are connected. What are the other two for? How can I test the ECU. Fortunately the wires for power supply, the fuel pump and earth etc are labled so that should be OK. Does anyone know of a Haltech supplier / distributor in the UK or have any practical knowledge of fitting such a system to BMW R100/7 boxer twin. All help gratefully received. Bob Moseley bmoseley@xxx.com Redditch Enlgland ------------------------------ Date: Wed, 20 Oct 1999 07:44:46 -0600 From: bearbvd@xxx.net (Greg Hermann) Subject: Re: DIY_EFI Digest V4 #591 > >Currently my engine only consumes somewhere around 625 cfm max...I believe >that the BB TBI's flow 670 cfm so I too have thought about a BB TBI...Holley >makes a SB TBI manifold good for 6000 rpm as well...I'll have to check it's >height though? > Hi Doug-- Watch out for the flow on things like Holley Pro-Jection. 2 barrel carbs are rated for flow (in cfm) at 3 inches of Hg pressure drop. 4 barrel carbs are rated for flow at 1.5 in. Hg pressure drop--NOBODY seems to publish the pressure drop at which things like pro-jection are flow rated---BUT--I have talked to folks who have tried the pro-jection, and found, by experience--their engine does _ NOT _ flow nearly as well as with a 4 barrel of similar flow rating--that Holley must be rating the projection units at some (unknown) higher pressure drop!!! (Just for general info, the multiplier for comparing 2 barrel carbs to 4 barrels is .707. A 350 cfm rated 2 barrel only flows 247.5 cfm if rated using the same test conditions which are used for rating a 4 barrel!) Regards, Greg ------------------------------ Date: Wed, 20 Oct 1999 13:32:04 +0100 From: Ade + Lamb Chop Subject: Re: DIY_EFI Digest V4 #590 At 15:00 19/10/99 -0400, DIY_EFI Digest wrote: > >Date: Tue, 19 Oct 1999 07:53:07 PDT >From: "Gary Moulton" >Subject: Manual control of IAC motor > >Can someone tell me which terminals of the IAC motor runs the pintle in and >out? The wiring diagrams show two coils and the connector has 4 terminals. >Does one coil send the position back to the ecm and the other is a 12 volt >reversable dc motor? > >Application is 1994 Mopar 4.0L EFI in a 1982 Jeep CJ-7, and what I want to >do is be able to manually adjust the idle lower than the 750-800 rpm when >off-roading. I have connectors and a harness and some electrical experience. >I plan to have a switch to disconnect the IAC from the system for manual >control and a spring loaded switch to "bump" the IAC position in or out. >There is a company offering such a controller for more money than I think it >should cost to build one myself. Thanks in advance I don't know about your system but the mini one IAC is a stepper motor. You need a driver to run it. The motors I have seen have a permanant magnet on the spindle then the driver powers coils to step the field round. I am supprised it doesn't have any feed back of where it is though. I suppose the ECU gets it to the right place by trial and error. Then resets it's self back to a postion where startup is good. There are loads of driver chips around cannot think of on off hand. There are 2 different sorts of motor too 4 and 6 wire ones... cannot remember what yours is called tho. HTH, Ade ------------------------------ End of DIY_EFI Digest V4 #592 ***************************** 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".