DIY_EFI Digest Thursday, 28 December 1995 Volume 00 : Number 015 In this issue: Re: 2 Questions about GM-TBI Hello Re: General question cheaper FI computers Re: cheaper FI computers Re: cheaper FI computers See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: FIScot@xxx.com Date: Wed, 27 Dec 1995 11:10:25 -0500 Subject: Re: 2 Questions about GM-TBI Subj: 2 Questions about GM-TBI Date: 95-12-26 14:42:33 EST From: blwalt@xxx. Walters) > 1. Is anybody using GM TBI injectors in their projects? They seem quite > rugged & I wonder what all you can do with them. I am in (slow) process of trying to use them. This was triggered by an article in Sept '91 Truckin' magazine. Turbo City had put two dual TBI's on a two-four barrel intake manifold. It looks slick, and has plenty of air flow ability. I called and they said you HAVE to have a custom chip (of course!). That meant a DIY'er had to figure out the GM TBI computer, if you wanted to use it. That being done, I still have two questions. Will the stock peak-and -hold injector drivers like having double the load if I parallel the the TBI injectors? Turbo City claims to use the stock truck TBI ECM. The if drivers will live, maybe a little extra in the injector voltage compensation tables (or similar) will make up the difference in injector turn-on time? Any comments? Also, the firing order. The intake is an Offy 360. It is similar to an open plenum with a divider in the middle. This puts cylinder #7 just 90 crank degrees after cylinder #5, with another 630 crank degrees until cylinder #5 fires again. Will this set-up have a big mixture distribution problem? That is, will cylinder #5 receive most of the fuel that is injected? > 2. If you want to fabricate your own tuned intake runners for a 350, what > is the best way to replace the lower part of the manifold? The TPI style > setup is not what I had in mind. TPI has long runners. This makes great mid-range torque. Great for gas mileage, and I imagine a great tow-motor in a truck. If you want lots of upper RPM HP, then some other form of manifold is required. This is part of the reason for my persuing the dual TBI's. They will be used on a much shorter intake manifold, that was meant for wet-flow. A tunnel ram is also meant for wet-flow, maybe you could adapt the base of a tunnel ram manifold, with your own custom plenum on top? Of course, I have to get an SBC to mount this on..... The present V-6's in the famaily vehicles just won't do. Thanks, Scot Sealander FIScot@xxx.com ------------------------------ From: Jack Alford Date: Wed, 27 Dec 1995 14:18:22 -0600 Subject: Hello Hello All ! I'm new here and thought I'd introduce myself, my name is Jack Alford and I live in Decatur, AL. My current Fi project is an attempt to put a GM TBI unit on my little 4cyl. 22R Toyota motor in my 4wheel drive pickup. Before you tell me, I know Toyota has later model truck engines with EFI but they use a sortof TPI which won't work on the higher compression head/piston setup that I am using, without ALOT of expensive head modification .... I have *mentally* conquered most of the obstacles for completing this swap except figuring out what to do about my distributor. The wiring diagrams for the vehicle that I got my TBI unit out of show four wires going from the ECM or coil, can't remember now, to the distributor. Any ideas ?? Oh yeah, my donor vehicle is an '88 S-10 w 2.5L engine, it's about the same size motor as my 4cyl toyota and the TBI unit is of the one-barrel variety ... Any and all info. appreciated ... - jack alford ==> toy4x4@xxx.com --> Decatur, AL ------------------------------ From: LotusM50@xxx.com Date: Wed, 27 Dec 1995 17:43:25 -0500 Subject: Re: General question In a message dated 95-12-21 22:10:59 EST, dzorde@xxx.au writes: > I found Haltech too expensive when I was looking for one, there are a > lot of equivalent systems around that are cheaper. > > > Dan dzorde@xxx.au > > Can some one tell me what the cheaper systems are? Most of the systems I've heard of cost about the same or more than Haltech. Thanks - -Bonn ------------------------------ From: Doug Robson Date: Thu, 28 Dec 1995 11:07:28 -0800 Subject: cheaper FI computers Microtech In australia sell for about 700 ish and use limited adjustablility mainly for racing. I can find out a contact if you want - -- Doug Robson Sydney Australia - ------------------------------------------------------------- doug@xxx.au | Thank God for | Club Car Racing Register of NSW | Gravity 1992/93 Under 2 litre State Champion | - ------------------------------------------------------------- ------------------------------ From: Craig Pugsley Date: Thu, 28 Dec 1995 11:58:14 +1100 (EST) Subject: Re: cheaper FI computers > > Microtech In australia sell for about 700 ish and use limited > adjustablility mainly for racing. I can find out a contact if you want while the mircotech will work, for $700 I'd be looking for a _digital_ computer, not 50 bucks worth of analog components in a nice looking box. I think you can get one of the stripped down Haltechs in this range (you get better prices if you can get a mechanic with a business card to order it too..). Hmm.. How about diy_efi mate's rates from the guys on the list who make/sell this stuff.. Or you could wait a while for the EFI332 guys to get something together ;-) Cheers&Happy new year, Craig. PS any more thoughts on algorithms for the EFI332 box? ------------------------------ From: orin@xxx. Harding) Date: Wed, 27 Dec 1995 21:07:49 -0500 Subject: Re: cheaper FI computers >Microtech In australia sell for about 700 ish and use limited >adjustablility mainly for racing. I can find out a contact if you want > >-- >Doug Robson Sydney Australia >------------------------------------------------------------- >doug@xxx.au | Thank God for > | >Club Car Racing Register of NSW | Gravity >1992/93 Under 2 litre State Champion | >------------------------------------------------------------- > > I'll start keeping a list of the after-market EFI systems that get listed here. .In a month or so I'll post the list here..If you send the name of a company, p lease give as much info as you can, not only name, address, phone, but also pri ces and features... Let's go guys....This will be a nice list to develop... Orin Harding - Greensboro, NC ('74 MGB-GT - '79 MGB Roadster - '95 3000GT, BRG of course!) ------------------------------ From: orin@xxx. Harding) Date: Wed, 27 Dec 1995 22:03:59 -0500 Subject: Re: cheaper FI computers >Hmm.. How about diy_efi mate's rates from the guys on the list who >make/sell this stuff.. Or you could wait a while for the EFI332 guys to >get something together ;-) Word has it that the EFI332 guy's are not going to have a simple to use program ming interface for quite some time. This will keep a lot of us from trying to use that system. Hopefully they'll change their mind and develop a "user frien dly" software package.. Orin Harding - Greensboro, NC ('74 MGB-GT - '79 MGB Roadster - '95 3000GT, BRG of course!) ------------------------------ End of DIY_EFI Digest V0 #15 **************************** 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".