Here are the pictures:
Hope this helps!
thanks Yusuke,
i’ll get a pic of mine so they can see what it looks like without the latching chip and program chip and resistor.
I sell ECU chips (on Ebay every now & then… haven’t in awhile since I’ve been out of town a lot) and I chip ECUs. There’s a difference between non-OBD (90-91 PR4) and OBD-1 ECU chips (92-95 PR4, P74, P75) and how they work and how to install them. I’ve seen quite a few people selling chips on Ebay and half of them are junk. The settings are all screwed up and they all dump too much fuel, thinking that is what gives you power (which there’s more to that in EPROM programming). Feel free to email me questions and I’ll be more than happy to answer anything (I’ve been selling chips and chipping ECUs for a couple of years now… right up there with Katman & Locash, just I don’t advertise that much).
BTW, there are NO Mugen, Spoon, JUN, Toda, Skunk2 chips availabe for a DOHC non-VTEC ECU. If anyone says otherwise, they’re lying to you. Mugen and those other companies only specialize in DOHC VTEC ECUs (mostly OBD-1, but I also have a few non-OBD chips for the PR3 and PWO). No Japanese company makes a chip for the LS ECU. The main companies that make them for the LS ECU are XS Engineering and GUDE (XS is actually a better program… tested on 4 different cars, including my old turbo B20 setup).
here’s a pic of stock 93 integra RS ECU.
ok, if you look at the pics Yusuke posted, there is a capacitor on his ecu on C51. also it looks as though his resistor is on R54 and not on J1.
Yusuke, can you get the value or part# off that capacitor and post it?
Dan (g2guru), what do you make of this?
thanks everyone.
newman-- how much is a ‘skunk2’ ecu run? can you tell me the difference between all of them? i know i want something ( maybe not right now ) that has good fuel/timing maps, w/ a redline or 8500 or 9 or something realistic, and a decent vtec Xover-- also, how much would it be if we sent you out our ECU , and how much would it cost without? please advise us on this neverending struggle. thanks.–later
The pics are very helpful. A closeup of the location around R54, C51, C52 would help alot to decipher the value of that resistor. We still need one of a chipped 90-91 ecu, anybody got one? I will pull my stocker out for a comparison pic if ned be. The location of the 28 pin chip (there is one, no empty socket) and the layout of the PCB on the on the 90-91 is different. Any advice newman? I know I sound persistent, but are any resistors, etc. needed, and does the non OBD pr4 need the latching chip? Also, does anyone know if the a/t PR4’s can be converted to M/T spec by removing/adding a resistor, as in some of the JDM vtec ecu’s?
oops i missed the c52 capacitor
good eye brinks 
Originally posted by RedStarGsr
newman-- how much is a ‘skunk2’ ecu run? can you tell me the difference between all of them? i know i want something ( maybe not right now ) that has good fuel/timing maps, w/ a redline or 8500 or 9 or something realistic, and a decent vtec Xover-- also, how much would it be if we sent you out our ECU , and how much would it cost without? please advise us on this neverending struggle. thanks.–later
Believe it or not, the Skunk2 program has the same coding as the OBD-1 Mugen program… I’ve tested both out on my prom machine and ran them through a couple of logic programs I have (past CMPE courses come in handy 
). Skunk2 uses more “jumpers” and different things on their ECUs to make it run slightly different… I have it written down somewhere. But if you just plug the chip in just like the Mugen chip, it runs the same. The VTEC x-over is 5700 and both have a 9200 redline. Email me if you’re interested in a chip, but soldering is required to install any chip.
Originally posted by brinks
We still need one of a chipped 90-91 ecu, anybody got one? I will pull my stocker out for a comparison pic if ned be. The location of the 28 pin chip (there is one, no empty socket) and the layout of the PCB on the on the 90-91 is different. Any advice newman? Also, does anyone know if the a/t PR4’s can be converted to M/T spec by removing/adding a resistor, as in some of the JDM vtec ecu’s?
From what I’ve seen, the non-OBD LS ECUs are just like a PR3/PW0 ECU… where there is an existing chip in the ECU and you need to desolder that one out and just SWAP it with the programmed chip… that’s it. On the OBD-1 (92-95) LS ECUs, you need to add another smaller chip, a jumper, a resistor, and anything else to make it run. But with non-OBD, it should just be the same as a PR3, switching a chip.
As for converting an auto LS ECU into 5-spd, technically it should work because just like on a PR3 or P28 ECU, the new chip has all new fuel curves and changes the timing settings, not the mention the power increases and redline changes (or VTEC x-over changes if applicable), then yes you should be able to convert a auto into a 5-spd with an aftermarket chip… however I haven’t tested it out yet on a LS ECU, but it works fine on every DOHC VTEC ECU that I’ve tried, whether it was non-OBD or OBD-1.
ok, here’s the scoop for the 93 integra non vtec ECU
R54 gets the 1k resistor
j1 gets a jumper wire
latching chip
program chip
suggested to get the lowprofile socket for the program chip
so u can change chips if you so choose
no need for the capacitors.
thanks Newman for the email
Here’s what you need to do to chip the PR4 ECU. Add jumper to J1, add a 1k 5% tolerance resiston to R54, add 28 pin low profile dip socket and EPROM, and finally add in the SN74HC373N CMOS Latching Chip. The capacitior isn’t necessary. Let me know if you have any problems.
newman- and/or anyoen else…i want an aggressive ecu, and 5700 vtec xover sounds good, but 9200 seems a little high for now and knowing me i’d probobly miss a shift or does something very damaging. are there any other progs that are aggressive but w/ a less rev limit? can you change that on your prom machine? thanks for yer help newman…
-dan you know wayyyyyy too much!! haha ( thats a good thing )
i’m sure theres lower rev limit with still agressive program…
but another solution is MSD 6al with the soft touch rev limiter, u can set your rev limit to where u want it.
and you’ll also have better spark, and more mpg etc.
I’m in need of some type of rev limiter for my car. I already bought an ice pack ignition so I won’t be able to use an MSD, but do you guys know of another way to limit my revs? I’ve thought about changing chips on my ECU I knid of like the one I have right now. Can anyone recommend a good chip with a rev limit of about 7500?
burnsmokey has a Dinan chip for sale on our parts exchange forum i believe the redline on that is 7500…
here’s part of what he told me in an email…
The specs on the ECU are rev limit 7500, no speed limit, changed fuel curve, the idle is rough
i ordered a chip to do it myself, he’s selling the whole ECU.
edit:
here’s the link to his thread.
http://www.g2ic.com/forums/showthread.php?s=&threadid=7397
yeah Dan you know way too much in my eyes…your starting play around with ECU, i mean chipping it…thats a whole new ball game. You got big ballz there man! Anywayz i got a question for you too…i’m running the Mugen program for my ls/vtec and it suck A$$. At the top end i sure lag a lot. oh also this is s pr3 ecu duh! non-obd! but i want top end too…all i know is that the power is not there…so what do you think Dan, cuz it seem like you have gone through a lot of ECU…dunno if you have!
But man quit your job and start something new like
“DP ENGINEERING PERFORMANCE”
Originally posted by G2guru
Here’s what you need to do to chip the PR4 ECU. Add jumper to J1, add a 1k 5% tolerance resiston to R54, add 28 pin low profile dip socket and EPROM, and finally add in the SN74HC373N CMOS Latching Chip. The capacitior isn’t necessary. Let me know if you have any problems.
Damn!!! lots of electrical engineering going on here 
:shock: kick ass!!!
Phil, contact Vteg4gs (Greg Samaroo) off of Honda-Tech board. He has some really nice programs. I’m running a custom program for the Toda Bs. Or you can always get the FF Specail Program from Katman on JDM hondaparts. These two programs as well as the Mugen program for the P72 are ones that I have dealt with. I also didn’t like the Mugen P72 ECU. But I’ve heard that the Todas really don’t get along with the Mugen program.
Dan, do you recommend or know of any other program that runs good on B18A’s? I want to compare another program with my current one.
Yusuke: Sorry, I never really got into the LS ECUs. I had a Katman chip for mine but my motor blew up before I had a chance to install it. I ended up sending it back to him in exchange for a P72 Chip for my “new motor”.
I’ve heard good things about Locash Racing Chips…but I don’t have any personal experience with them. Best of luck and let me know if you need anything else. Later.