DIY_EFI Digest Friday, February 11 2000 Volume 05 : Number 061 In this issue: Nitrous controller RE: help - Motronic M1.5 adaptation issues Re: Fuel pressure reg/EGO Qs See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Thu, 10 Feb 2000 21:55:57 -0800 From: "Scott Croughwell" Subject: Nitrous controller > Does any one have experiance or knowlege of how I could adapt an existing > computer to regulate an injector that flows nitros to maintain a constant > 60 degree temp in the plenum on a turbo car? I think you'd be best off going with the "usual" nitrous setup. Regulating nitrous flow according to temperature isn't so easy because the nitrous comes from a bottle that may have up to 1,500 psi. The only way to regulate nitrous flow with conventional nitrous solenoids is to give them a duty cycle, and the smallest one takes about 12 amps of current to open! I'm sure another way can be engineered, but not for a practical home-brew application, cost-wise. Personally, if I were using nitrous as a sole method of intercooling, (depending on setup; this is just an example) I'd simply go with a direct-port configuration. My last turbo 4 cylinder was a '95 Civic EX... the motor was built simply with aftermarket forged conrods and pistons, with a non-intercooled turbo system running 1 bar of boost. The nitrous was activated by two switches in series; a full-throttle switch and a 10 psi boost switch (I got that from NOS). The nitrous system was jetted for 80 hp. There are various takeoffs on that... you can shut off the nitrous once you hit a certain boost level or whatever. But for intercooling, I imagine you'll want to do what I did and just leave the nitrous on. BTW, that nitrous system was also a half-assed way of getting more fuel into the motor over 10 psi... I jetted it extra-rich. But hey, she ran 12.01's even with that sprinkler-system method of fueling!! Scott - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Fri, 11 Feb 2000 10:04:25 -0000 From: "Rich M" Subject: RE: help - Motronic M1.5 adaptation issues Motronic M1.5 batch fires the injectors (all at the same time) so the motor running will probably be pretty insensitive to injector timing retard. I have a feeling that the crank sensor does not statically align with the tooth gap at TDC - not much help that on it's own I know, but if I get the opportunity I'll try and find out. Rich. > -----Original Message----- > From: owner-diy_efi@xxx.org]On > Behalf Of Aribert_Neumann@xxx.ca > Sent: 10 February 2000 20:59 > To: diy_efi@xxx.org > Subject: help - Motronic M1.5 adaptation issues snip > 2. Initially I thought that I had mispositioned the crank sensor > relative to > the trigger wheel. If I had the crank sensor mispositioned by 20 > deg retarded > the injector firing should be retarded also. Would the engine > not reflect this > when running? Does anyone know the static angular relationship > between TDC, > crank sensor location and the missing teeth on the trigger wheel > for Motronic > systems? I am making an assumption that the relationship would > be similar for > various versions of the Motronic series. > snip - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Fri, 11 Feb 2000 06:34:19 -0500 From: Seth Subject: Re: try this URL: http://www.wolfems.com.au/index.htm - -Seth Mary or Stephen Burgess wrote: > > Can anyone tell me if Wolf 3D has a website or email address > > ---------------------------------------------------------------------------- > To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) > in the body of a message (not the subject) to majordomo@xxx.org - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ Date: Fri, 11 Feb 2000 17:47:30 +1100 From: Andy Wyatt Subject: Fuel pressure reg/EGO Qs Hey y'all Could someone please explain to me: 1. Why do they have fuel pressure regulators manifold pressure referenced? Why don't they just take this into account in the fuel map? Is it so that the injectors are open longer at idle, improving trimmability and hence idle quality? 2. Has anyone tried to use a standard EGO sensor to tune an engine? I'm currently trying it, but it has so much hysteresis that it isn't working. How do factory ECUs do closed loop control, esp at idle? Cheers Andy W :-D - ---------------------------------------------------------------------------- To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes) in the body of a message (not the subject) to majordomo@xxx.org ------------------------------ End of DIY_EFI Digest V5 #61 **************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. 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