like the title says whats the difference between these 2?i want to get my 88 crx si ecu chipped but most of the chips are for 90-91's, thanks

 

That's because of the different E-prom chip used.
You can chip the 88-89 but not with the same steps as you would the 90-91.
to make it simple, get a 90-91 and be done with it.

If you want to read about it go to this site
http://www.ghettodyne.com

 

They are for 90-91 ECU's because those are the only ones that can be chipped easily (without a daughterboard for the new eprom). See, 88-89 ECUs dont have external eproms and the 90-91 versions do. So to chip the 88 ECu you will either need to burn a new MCU with the program you want or make a daughterboard that plugs into the MCU socket and has an eprom (the 90-91 chip) on it.

Ben

EDIT: go to wiki.pgmfi.org if you want to just read about it.

 

ok thanks because i am just going to use the 88 pm6 ecu with a rpm activator for vtec for my y8 that i am swapping and i am pretty sure i will need better fuel and a higher rev limit, or not?? i really dont wanna do the obd1 conversion

 

use a pr3 with a "mugen" type program that removes 2nd O2 and knock sensor codes. I did it for a while with my Z6 and it worked awesome.

 

that "mugen" program probably removed both o2 sensors. you cant remove just one.

http://www.hondata.com/techo2problem.html

If you are going to go with an ECU that controls the VTEC get a PS9 (90-91 ex ecu) and let me put a 1 wire VTEC program in it. they are cheap and very effective (we have one running a JRSC B16 right now).

Ben

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by kid-honda &raquo;</TD></TR><TR><TD CLASS="quote">
WRONG nothing in america had VTEC before 92.
Just covert to OBD 1 and use a P28.
</TD></TR></TABLE>

What happened to that ^^? Did you realize you are dumb and decide to edit?

the 1 wire vtec code was developed (not by honda) for the sohc vtec swaps. It works off the auto lockup solenoid hardware already in the PS9 ECU's. Like I said, i am using it in a buddy's JRSC B16 90 std.

Ben

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ben Ogle &raquo;</TD></TR><TR><TD CLASS="quote">that "mugen" program probably removed both o2 sensors. you cant remove just one.
Ben</TD></TR></TABLE>

Weird. My Mugen programmed ECU gave a code 1 a while ago.
It did it once and never again.

 

There are a lot of so called "mugen" programs out there. Some dont disable ****. I have about 5 floating around my computer and they are all way different.

Ben

 

How do you tell what year ecu you have?

I have an ecu in front of me, I know its out of an si,
but dont know year.

 

It should be stamped on the side. I think in blue ink.