DIY_EFI Digest Thursday, October 7 1999 Volume 04 : Number 565 In this issue: Re: Jeep 258 Conversion See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Thu, 07 Oct 1999 00:59:21 -0400 From: Shannen Durphey Subject: Re: Jeep 258 Conversion > Date: Mon, 4 Oct 1999 20:46:17 -0500 (EST) > From: Mike Comai > Subject: Jeep 258 Conversion > > I am new to the list as well. I have recently been looking into an > upgrade for my AMC 258 I6. It has become clear to me that the only way to > economicly do it is to do it myself. I have looked into Howell's kit and > it looks pretty good (aside from the $1k pricetag). I called up and tried > to order just the GM -> AMC intake adapter and they would only sell it to > me with their "harness" and PROM. Here is my 1st question - They charge > $350 for their harness and I asked them why it was so expensive they said > it was due to the filter for the RPM sensor. What is the signal needed at > the computer and what kind of conditioning would I have to do to the > signal off the negative side of the coil? > > I also plan on getting an adapter machined (unless there is a better way?) Maybe there is a better way. Look for Holley's website, look for service parts, then look for the adapter. If your AMC uses a Ford style distributor, I've seen claims that the GM module can be driven off the Motocraft pickup coil. This might eliminate the special filter. > but I don't know how crucial the design is. My thought was to take the > shop the old Carb and the new TBI and have him machine me a 1" thick > plate, putting recessed holes for the plate to manifold mount bolts and > threaded holes for the TBI to plate mounts. How crucial is it to taper > the TBI hole to the manifold opening? Are sharp edges ok or does it need > to be smooth? What is the present carb (1, 2, 4bbl)? What type of tbi are you looking for (1,2,4bbl)? Look for Jason Weir's web page. He's converted a Jeep engine to GM TBI. If you look in the DIY_EFI archives there may be some good info. http://efi332.eng.ohio-state.edu/diy_efi/ > > Last question is about the PROM. I will probably eventually write my own > prom but initially I plan on using the prom from a 4.3L GM donor (post > '87). Will it adapt to the 4.2L AMC motor ok? > > I would appreciate any help and suggestions for improving my approach as > this is a new thing for me. Again, look at Jason's page. He's got some good firsthand experience with a similar project. Shannen > > Mike Comai > 1979 Jeep CJ-5 > ------------------------------ End of DIY_EFI Digest V4 #565 ***************************** 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".