DIY_EFI Digest Thursday, January 20 2000 Volume 05 : Number 032 In this issue: re:Minimum to run GMECM? Re: re:Minimum to run GMECM? Re: Knock Re: DIY_EFI Digest V5 #29 See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Thu, 20 Jan 2000 08:53:19 -0500 From: "jtyler" Subject: re:Minimum to run GMECM? Bruce wrote: >So you with this limited >background want to jump in and redesign what gm has spent millions of >dollars on.. Not at all. The point is NOT to design a ground up system! In fact you are whom suggested I check into the GM's for a BASIC FI conversion application. >2nd, leaving all/most/some of the sensors disconnected negates any >benefits to running efi, might as install a carb.. You misunderstood the purpose of the question. I plan on running several sensors (except VSS)for the reason you mentioned, but I would like to start with just the ignition, map,temp and TPS if that would work. So, other than setting service codes, will the ECM run like this, or will it likely go into a limp home mode of some type? Jim Dopey ------------------------------ Date: Thu, 20 Jan 2000 10:07:27 -0500 From: "Bruce Plecan" Subject: Re: re:Minimum to run GMECM? You want to run the system, in your own configuration, for what ever reason. Your not going to like it when your done. Look in the archives, for the dozen of so threads about deleting the VSS. The other inputs are all necessary, also. It is far easier to plan things out once, install it all, and then fine tune something then cob bit by bit together. I'm just trying to save you time/money, I been thru this dozens of times, on+off list. You want to ignore this, fine, least I tried Grumpy | You misunderstood the purpose of the question. I plan on running | several sensors (except VSS)for the reason you mentioned, but I would like to start with just the ignition, map,temp and TPS if that would work. | So, other than setting service codes, will the ECM run like this, | or will it likely go into a limp home mode of some type? | Jim | Dopey ------------------------------ Date: Thu, 20 Jan 2000 09:13:51 -0600 From: "Robert W. Hughes" Subject: Re: Knock > > Actually, the exhaust gases dilute the mixture and make the combustion > > temperatures lower. > > How do you add hot and get cold? > I'm confused.... > > > From: "Scott Croughwell" > > > > How does the hot exhaust gas cool the fresh charge.... Or have I got this > > > wrong and you mean that the exhaust gas isn't heating the cool intake charge > > > and the cold intake charge is causing the detonation???? > > > > Believe it or not... the gasses coming from the EGR have had enough time to cool > > enough so that the portion of exhaust temp re-entering the intake port is cooler > > than the intake manifold. and from another note > With EGR operational, as > soon as the valve opened under the same conditions the intake manifold temp > jumped to 210F on a 75F day. I think that it is less a temperature issue > than a charge dilution issue. But with some fine tuning of the spark map, > you can easily eliminate any detonation you may experience. This is what I was saying. The exhaust gases dilute the mixture and and result in cooler combustion chamber temperatures which reduces nitrogen oxide formation. The mixture also burns slower and so requires more ignition advance. The exhaust gases are not cooler than the intake, on my car they are hot enough to melt and burn out 60-40 solder in copper piping. > > Wow so the exhaust gas is cooler than the intake I never would have thought > so.... hell I'm not even running emmissions gear, don't have to here in NZ. It > is even legal to remove cats.... How about dogs? sorry - -- Robert W. Hughes (Bob) BackYard Engineering 29:40.237N, 95:28.726W Houston, Texas rwhughe@xxx.net ------------------------------ Date: Wed, 19 Jan 2000 19:15:30 +0000 From: Ade + Lamb Chop Subject: Re: DIY_EFI Digest V5 #29 >Hi Ade, > >I had a mini catalogue a while ago which listed an LCB Y peice with a boss >for mounting a lambda sensor. Unfortunately I can't find the catalogue >anymore, but I would suggest you try the usual big suppliers MiniSpares, >MiniSport, MiniSpeed, etc. I bet you non mini owners just can't believe the >cunning originality in these names ;-) Or maybe even try going directly to >somebody like Maniflow. Either way it would be cheaper than wrecking a whole >LCB. > >Gareth Jones I have just bought a nice maniflow LCB... I am not going to buy another other one! Ade ------------------------------ End of DIY_EFI Digest V5 #32 **************************** 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".