ECU Chip?
Honda-Tech Member
Joined: Oct 2000
Posts: 4,490
Likes: 2
From: GTA, ON, Canada
Re: ECU Chip? (JDM EJ1 95)
yes and no. depends on the ecu type, and the type of program.
also switch will require the ecu to be unplugged and all the memory obtained from previous maps removed. not always but most times. much better way is to store the 2 programs on 512 k ROM and switch between pages .
also switch will require the ecu to be unplugged and all the memory obtained from previous maps removed. not always but most times. much better way is to store the 2 programs on 512 k ROM and switch between pages .
Honda-Tech Member
Joined: Jan 2005
Posts: 7,015
Likes: 7
From: b00sting my D16s, SoWis, USA
Re: ECU Chip? (JDM EJ1 95)
If it's obd1, you certainly can. Look at this picture:
http://home.mn.rr.com/keebler6...d.jpg
Locate the number "27256" in the outlined [missing] chip space, go directly up - you'll see the two holes for "R54", above that is the "J1" jumper connection. When J1 has a wire connecting the two leads, it reads the program on the chip you added. When it's open (not jumpered) it bypasses the two chips you put in and acts 100% stock [at least after you reset it]. Just unsolder the wire that's normally put in there (assuming it's already set for chipping) and put a switch there. Wax on, wax off.
BTW why the hell would you want to do this? I thought about doing it, but there is no benifit outside of maybe pussifying your rev limits & etc for when a friend drives it. It's $45 for a cheap rom burner, so I'd suggest looking into uberdata instead. If its an ebay chip, get a $7 Zif socket, if not just a $1 press-n-hold socket.
http://home.mn.rr.com/keebler6...d.jpg
Locate the number "27256" in the outlined [missing] chip space, go directly up - you'll see the two holes for "R54", above that is the "J1" jumper connection. When J1 has a wire connecting the two leads, it reads the program on the chip you added. When it's open (not jumpered) it bypasses the two chips you put in and acts 100% stock [at least after you reset it]. Just unsolder the wire that's normally put in there (assuming it's already set for chipping) and put a switch there. Wax on, wax off.
BTW why the hell would you want to do this? I thought about doing it, but there is no benifit outside of maybe pussifying your rev limits & etc for when a friend drives it. It's $45 for a cheap rom burner, so I'd suggest looking into uberdata instead. If its an ebay chip, get a $7 Zif socket, if not just a $1 press-n-hold socket.
Thread Starter
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Joined: Feb 2004
Posts: 4,670
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From: Hello Friend, illinois
the only reason i would like to do this is because i overreved my engine a few times and id like to be able to have a stock rev limit when i want to.. and my car runs rich with the chip so id like to have better gas mileage... and yes ill be getting uberdata soon to tune my cams...
its a Dinan chipped P75.... 8500 revlimit is too high for my LS....... theyres a noticeable difference in the top end power when i dont run the chip ... it came with my swap from hmotorsonline.com
its a Dinan chipped P75.... 8500 revlimit is too high for my LS....... theyres a noticeable difference in the top end power when i dont run the chip ... it came with my swap from hmotorsonline.com
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Joined: Feb 2004
Posts: 4,670
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From: Hello Friend, illinois
now i just did it... and it works... haha i tried to switch it when the car was driving.. ecu went in limp mode and it was halarious.... but anyways it works... i was just wondering if i can cause damage by doing this mod... i turn the car all the way off before i switch it...
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david76008
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