DIY_EFI Digest Saturday, 5 October 1996 Volume 01 : Number 301 In this issue: re: RE: drive-by-wire Re: FW: PC compatible motherboards ? about ecu for sentra se-r Hot cam injection volume table changes Re: FW: MAP DIY Traction Control? See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: Mark Eidson Date: Fri, 4 Oct 1996 14:57:53 -0700 Subject: re: RE: drive-by-wire The article, http://www.dcc.edu/vettenet/ls1-4.html, about the LS1 engine indicates that there is some standard that is difficult to meet with a stick transmission. Apparently GM is the only one able to meet it with high performance engines and the new Vette will still be available with a stick. me At 02:55 PM 10/4/96 CDT, you wrote: >Mark Pitts Wrote: >| in the USA guys... I've got a warped view of your country from films and >= >| TV and stuff, but I cant remember the last time I saw summit with a = >| manual box. (is that what you call 'stick shift' ?) > >Depends on the type of car. The only cars you typically find with sticks >(manuals) are economy cars, some sports cars, and some trucks. Take >Hondas. Most of them used to be sticks, now most of them are autos. Of >course, they used to be cheap cars, now they're expensive. As far as >sports cars go, 5.0 Mustangs are at least 50% stick, maybe more. For some >reason GM sports cars are usually sold with auto. Even vettes. Peeking in >windows tells me that only 30% or so of vettes are sticks!! Doesn't make >sense, that 6 speed is a thing of beauty. Camaros are even more lopsided. >You hardly ever see a stick Camaro. > > >These observations are from people I know and looking in car windows, I >don't know any real statistics on how many sticks vs. autos get sold. > >--steve > > >Steve Ravet >sravet@xxx.com >Baby you're a genius when it comes to cooking up some chili sauce... > > *************************************************************************** * Mark Eidson Voice: (602)752-6513 * * Staff Design Engineer Fax: (602)752-6000 * * Manager System Integration and * * Verification E-Mail: mark.eidson@xxx.com * * VLSI Technology, Inc. * * 8375 South River Parkway * * M/S 265 * * Tempe, Arizona 85284 * *************************************************************************** ------------------------------ From: "Chuck Tomlinson" Date: Fri, 4 Oct 1996 17:51:21 -0400 Subject: Re: FW: PC compatible motherboards > From: tom cloud > > >By the time you get all the PC related junk working, drives, cases, power > >supplies, etc, you might as well just go buy a nice SBC that has all the > >stuff on it. I have seen 68332 boards for about $250 with some PD 'C' > >compilers, and assemblers that you can develop on the PC. Besides that the > >'332 has the TPU and other neat features that you can't possibly get on any > >PC or add on card. And it will stay working when you hit a bump! > > having to put stuff in the i/o card slots would be a major hassle: > you'd have to stabilize them so they wouldn't vibrate and even then > they'd eventually cause probs. (sooner than later) It's all in the mounting. We've done suspension development for several years with in-car PCs, usually providing a GUI and data logging services for '332-based controllers (those TPUs _are_ mighty useful). We beat the crap out of our suspension cars, and the old PCs have kept right on ticking. Remember that street cars are quite softly sprung. We rarely see peak vertical body accels above 2g, and then only momentarily. If the slightest effort is made to mount the PC correctly, it will never see enough acceleration to disturb the boards, and high frequency vibration will be almost non-existent. - -- Chuck Tomlinson ------------------------------ From: "Ronald S. Chong" Date: Fri, 4 Oct 1996 18:16:50 -0400 (EDT) Subject: ? about ecu for sentra se-r hi: anybody know where i learn about the innard of the ecu for the Nissan Sentra SE-R? in particular, how the data in the eprom/rom/prom/eeprom is organized? from my limited understanding, the chip basically holds a table to correlate air and fuel, among other things. any clues as to where i can discover this stuff? the dealer? (joke) is that propriety information (and therefore "top secret")? also, is the ecu based on a motorola controller or some other cpu? i like to learn how to to modify the table in the ecu. doing that is a long ways away, but i gotta start somewhere. thanks. /r/ ............................................................................... ___ ___ [ \ / ] Ronald S. Chong (rchong@xxx. wanna-be, father-to-be | | \/ | | Computational models of human learning and performance | |\ /| | http://ai.eecs.umich.edu/people/rchong/ [___]\/[___] Drive Happy... ------------------------------ From: Mark Eidson Date: Fri, 4 Oct 1996 16:31:50 -0700 Subject: Hot cam injection volume table changes >From the lack of response to my question I assume that predicting the change from a stock injection volume look up table for a hotter cam based on the cam differences, if only to get a ball park starting point, is not possible or practical. I really don't want to re-invent the wheel so any input is appreciated. Thanks, me. *************************************************************************** * Mark Eidson Voice: (602)752-6513 * * Staff Design Engineer Fax: (602)752-6000 * * Manager System Integration and * * Verification E-Mail: mark.eidson@xxx.com * * VLSI Technology, Inc. * * 8375 South River Parkway * * M/S 265 * * Tempe, Arizona 85284 * *************************************************************************** ------------------------------ From: Todd Knighton Date: Fri, 04 Oct 1996 20:48:30 -0700 Subject: Re: FW: MAP Mark, We use the MPX4250A, it's an absolute 0 to 250 kpa pressure transducer that's temperature trimmed and compensated. We place the sensor in the computer and run a small vacuum hose to it so you don't have to worry about fires and such, as well as the thing I think is safe up in the 5 to 10 bar range, so don't worry about back fires either. If you need an normally aspirated one use the MPX4100A, I think that's the number, it's 0 to 100 kpa, so absolute vacuum to atmospheric, depending on where you're at. The data sheets are available at the MOTOROLA web site. http://www.mot.com/ Good luck Todd Knighton Protomotive Engineering Mark Pitts wrote: > > Got the part # Todd? And possibly the URL for some info on it? > Thanks alot > Mark > ---------- ------------------------------ From: MaxBoost@xxx.com Date: Sat, 5 Oct 1996 02:50:32 -0400 Subject: DIY Traction Control? How about a DIY traction control system? Relatively simple comparison of wheel speeds (most cars have abs these days, so parts are readily avail). Wire into the injector ground circuit back to the ecm and drop cylinders as needed. Use a pic processor and some drivers to interupt the ground circuit. Also need an on off switch on the dash as well as a pot to adjust the percentage of slip allowed. (got to have the switch so you can turn it off and roast the tires :) Max. ------------------------------ End of DIY_EFI Digest V1 #301 ***************************** 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".