DIY_EFI Digest Friday, October 29 1999 Volume 04 : Number 609 In this issue: tach adapter Re: DIY_EFI Digest V4 #608 Re: Blowing Thru A Holley TBI list newbie - fi wanabee See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Fri, 29 Oct 1999 13:43:34 -0600 From: cwagner@xxx.net Subject: tach adapter I have another project that I am working on for a friend. He has a Toyoyta vehicle that had a 4 cyl engine that he dropped a v6 into. He wants to use the factory tach in the dash instead in getting a new one. Does anybody have any ideas for a tach adapter to convert a 6 or 8 cyl signal to a 4 or 6 cyl tach? I am hopping that I could make one thing that can do all this, like convert a v8 or 6 cyl to a 4 or 6 cyl signal in one package by changing some dip switches. Would a 555 or a op-amp work on something like this. If so, does anyone have any diagrams or schematics? ------------------------------ Date: Thu, 28 Oct 1999 16:18:12 EDT From: EFISYSTEMS@xxx.com Subject: Re: DIY_EFI Digest V4 #608 HI, As for the map sensor you just need a vacuum pump and a voltmeter and make sure as you're releasing the vacuum you don't see any dips or spikes in the voltage....as for the O2 sensor there are many ways these fail but when they get fouled they show lean all the time(low voltage 450mv or less all the time)hth's - -Carl Summers In a message dated 10/28/99 12:34:43 PM Pacific Daylight Time, DIY_EFI-Digest-Owner@xxx.edu writes: << 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 >> ------------------------------ Date: Thu, 28 Oct 1999 14:56:56 PDT From: "Bill the arcstarter" Subject: Re: Blowing Thru A Holley TBI Thanks for the info, Walt. That was very useful. So- would you suggest using an external (manifold pressure-compensated) fuel pressure reg vs the one built into the Holley head? Does anyone know if the built-in regulatro on the holley is ref'd to the pressure inside the throttle throats? - -Bill Date: Wed, 27 Oct 1999 20:22:44 -0700 From: "Walter Sherwin" Subject: Blowing Thru A Holley TBI >You have to be really careful when blowing thru a Holley TBI unit equipped >with their "B2" style injectors (which covers almost all of their TBI >units, except for their one barrel OE replacement units which use Rochester >TBI... ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ------------------------------ Date: Thu, 28 Oct 1999 21:10:26 -0400 From: David Brode Subject: list newbie - fi wanabee Hello all, Thanks to everyone that responded to my post. I think I'll stay away from a wet manifold FI. If I can't fangle a port injection of some kind on my blow through project, I'll stick with the #4781 850 carb. I've looked around at the archives and have learned some. Frederic; Why is the sy/ty ecu easier to change? Are ecu changes hard to do? Are there fellows that will do it for a few bucks, or is it a long drawn out affair? I assume the sy/ty ecu would be pricey/rare. Are there words I should use to search archives to learn about all the components I would need for a system? I know some will find it odd, but I know VERY little about fi. I know I'll need an ecu, 02 sensor, mas [or?], 8 [or 16?] injectors, tb or two, hp fuel pump, bi-pass boost referenced regulator.....???. Thanks again everyone. Dave Brode Frostburg, MD 511" tt pickup project fi wanabee ------------------------------ End of DIY_EFI Digest V4 #609 ***************************** 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".