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| djxib | Memcal - disconnecting the battery | ||
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Senior Guru
 
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I've been burning a few chips, and I usually disconnect the battery when removing and replacing the memcal. Tonight, in my haste, I forgot to disconnect the battery; however the car seems fine.
So, my question: is it good practice to disconnect the battery? (I suspect I know the answer). Thanks  |
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Posted on: 2009/3/17 0:50
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| MTVette | Re: Memcal - disconnecting the battery | ||
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Guru Newb
 
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I never disconnect the battery - I just pull the ECM fuse. Yes, you should do one or the other if you don't want dead electronics.
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Posted on: 2009/3/17 1:29
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| BrianCunningham | Re: Memcal - disconnecting the battery | ||
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Senior Guru
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I always disconnect mine.
I finally just put a kill switch, marine style, on it. |
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Posted on: 2009/3/17 1:59
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| joeld | Re: Memcal - disconnecting the battery | ||
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Guru
 
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You should also discharge any static electricity on yourself/and clothing by touching a good ground.
Joel |
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Posted on: 2009/3/17 2:29
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1989 Coupe,L98 automatic |
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| mseven | Re: Memcal - disconnecting the battery | ||
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Senior Guru
 
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I use the 512 chips w/zif socket and it isn't necessary to unhook the battery when changing chips, the only time I disconnect when tuning is if I want to see what the tune does w/out any 'remembered' trim cells. The other is when I have to do regular work on it.
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Posted on: 2009/3/17 6:58
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| anesthes | Re: Memcal - disconnecting the battery | ||
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Master Guru
 
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Quote:
Same here. All unhooking the battery does is clear the BLM correction data recorded in the flash portion of the ECM, thus making the time to tune greater since BLM will be all over the chart on the next start up rather than 'where you left off'. I don't see why anyone would disconnect the battery ever when changing the memcal since the pins are not energized until key-on when it enters bootstrap. Saying it would cause a problem is simply lack of experience. Also, get an emulator so you don't have to shut the car off.  Mick, Hows the beast? -- Joe |
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Posted on: 2009/3/17 10:48
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| dan0617 | Re: Memcal - disconnecting the battery | ||
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Senior Guru
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Only time I disconnect my battery while changing chips is as stated above. If I have completely changed my build and want to clear out the stored trims, I disconnect. Usually the battery is alredy disconnected from the work though. For regular chip tweaks and retunes I do not disconnect. No reason to.
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Posted on: 2009/3/17 15:28
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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| djxib | Re: Memcal - disconnecting the battery | ||
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Senior Guru
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Thanks guys. At the moment I'm working VE tables so I want to start from scratch on the learns; I'll disconnect the battery. When I get into PE I'll probably not disconnect the battery.
BTW - any recommendations on a quick disconnect? |
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Posted on: 2009/3/17 16:16
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| mseven | Re: Memcal - disconnecting the battery | ||
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Senior Guru
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Quote:
Joe, how's it goin? I agree on tuning w/an emulator...pretty much the only way. IMO I put the car on a diet and added some new stuff over the winter. I'm just buttoning up some details now. Hopefully the weather is starting to break and this year I'll be driving it in the spring, instead of building until fall. whats new w/yours? Mick to the OP...no quick disconnect here, just the old fashion way.....but that may change when I get the braille mounted in the back storage. |
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Posted on: 2009/3/17 18:49
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| jhammons01 | Re: Memcal - disconnecting the battery | ||
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Senior Guru
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I just wonder [and joelD touched on it already] I just worry about Electro static discharge ESD. If that things recieves an arch of any magnitude, it will be toast.
ESD protocols would be what I would adhere to. Making sure a charge is not present in the cars system would be one. I'm not expert, I'm just suggesting. Can you pick up chips without ESD gloves and a grounding strap?? Yes... ...is it recommended?? No. You be the judge. Of course this advice comes from one that is wafer Fabs on a weekly basis and deals with ESD protocol. So the shear numbers of opportunities for me to ruin a chip or a 8" wafer full of chips is greater with a greater Risk capacity as well. |
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Posted on: 2009/3/17 19:28
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| anesthes | Re: Memcal - disconnecting the battery | ||
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Master Guru
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Quote:
Case is grounded to D1, your holding the case. Any discharge will happen at that time. Once holding the case, carefully remove old prom/memcal, insert new. -- Joe |
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Posted on: 2009/3/18 10:41
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