Okay this will be my daily driven car and i do not drive hard at all.
the motor is a 2000 EX F23a1 & matching auto tranny with 13,000 miles.
my car is a 1993 accord auto.

What should i do:
A) keep obd1(94-97 ex auto vtec ecu, dizzy, injectors)
B)..... get the OBD2 f23 ex ecu and all OBD2 parts, and a conversion harness.

if i keep OBD1 on a F23 will i be HINDERING my perfomance at all?
or should just swap it in and call it a day!!!


help me out. I'm just parinod because the OBD1 ecu is 2.2 VS. OBD2 ecu is programed for a 2.3 sohc.

 

just something to think about...

F23 has a variable engagement VTEC x-over. anywhere from 2300 up to around 3700 based on throttle position and MAP sensor voltage. I've seen a bunch of dynos of F23s running VAFCs and the VTEC x-over set to the lowest value selectabel on the VAFC and they all look like a heart attack when they get to the high cam. a lot of power is lost in the 2300-3500 rpm range, right where you want it for around town driving.

it's not really a OBD issue per se, but chose your ECU carefully, as it might dictate whether or not you go obd1 or 2. I've got no idea if any of the F22s had a variable x-over but i'm thinking not.

maybe a f22 vtec cam would solve this problem. I've got no idea if it would or if it will even fit.


[Modified by jweller, 6:10 PM 2/2/2003]

 

anyone eles?

 

dude nobody wants to help a fellow accord brother out.

how hard would it be to convert over to ODB2 in my 93 accord?

 

Hard.

You dont want to do it. Youll be adding O2 sensors and rewiring for days since no one make a 2->1 harness.

 

I can get the orginal harness for about $60 bucks uncut! the how hard would it be?

 

be prepared to spend some time just figuring out which wire is what. I'd reccomend buying the Helms for both the car and the motor. and you will have to run some additional wires too.

It's a lot of work.

 

comon people i know that theres more memebers here that know the answer.
please ......
how about you KellerT

 

freakin re-wire jobs (i mean complete) can take 20+ hours a pop. Be warned. (And don't ever buy a car with a burned main harness - shiet!)

Edit: Why don't you just drop in a different, more applicable motor? Like a H22?

Edit2: Doing this conversion, your car will be down for at least 3-8 weeks. Can you do that? Remember, you lose motivation when you have access to other "living-drivable" cars. Pretty soon your 'awesome project' ends up sitting in your drive-way for 2 years.




[Modified by RotaryBzzz, 4:06 PM 2/5/2003]

 

orginal harness for what car? the obd2?..if you can get that just run the whole harness through the firewall and its plug and play

 

hum... lets see...i know it will not take 20 hours to re-wire and modify a dam harness bro... maybe like 5hours MAX with all the wires and soding/taping needed.
if you read the post i said that i can get the OBD2 f23 complete harenss undamaged for about $60.

WHY NOT AN h22? because i don't know how many miles are on them.. do you???
Im not looking for earth-shatteing vtec power yO! i just want to up grade and get a little more hp & torque. Plus this will be my wifes car.

***who the hell takes 2-8WEEKS.... maybe if i was in color blind and only had one arm! I know it will only take me no more than 2 nights to drop it in.
.... MAN still pissed about what you said...(2-8weeks ) i could see that ona H22 into a civic or somthing wicked like that.

^^^OH i also have a civic thats in storage if i do need it for 8weeks


sorry for the harsh words i just needed to vent.... time for one of these

 

i vote for the H22 it is a common swap and more people will be able to help you ... and on your question about how many miles are on it ..... well just find someone that has a prelude si that is wrecked and you will know the actual mileage ...

oh and BTW h22 into a civic isnt that bad of a swap to do in fact i think it would be easier then what your planning on doing

but this is just my opinion you can do what you want

 

[QUOTE
oh and BTW h22 into a civic isnt that bad of a swap to do in fact i think it would be easier then what your planning on doing

but this is just my opinion you can do what you want [/QUOTE]

hum that's the first time i have ever heard of this... h22 into EG easyer than f23 into 4th gen accord? haha newbies are funny somtimes

 

If you have the OBD II harness and ECU then just run those wires. If you have the harness all of the wires should be there, correct? I would prefer to stay OBD I but there is that variable VTEC on that f23 which may cause a problem.

 

i agree the best bet i think would be to run the obd2 engine harness plug it to the engine and tranny and so forth. then run it to the chassis harness
use the obd2 ecu..

 

THANKS guys...
can you tell me what is the difference between the OBD1 vtec and OBD2 vtec?

i've never heard of that difference.

 

not sure what you mean.. vtec is vtec...? now i think some of the newer gens have a "vtec-i" or something. still is vtec

 

The vtec is not so much OBD I or II as much as it is just different generations of the technology. The OBD I cars have a VTEC that kicks in at a predetermined RPM. OBD II ( for the most part) in Hondas started in 1996. The OBD II (some OBD IIs still have the old system)or in this case your F23A1 has a vtec system that varies when it kicks in based on sensor input to achieve fuel economy and/or power when needed. This type VTEC started in 1998 I believe.

 

I'm telling you it will be 2-8 weeks realistically. (3-4 hours a night working on it which is all you can tolerate - some nights more/ some nights less - can you do MORE than that? good)
Your going to have to figure out that entire OBD II harness and figure out what goes to what...PLUS
+ take out of original harness w/o damaging shiet (remove parts to get to)
+ install of new harness w/o damaging shiet (put back parts)
+ fabricate and place any new sensors that your going to need (i.e. O2 sensors - tap and drill into piping, run bypasses that might or might not throw codes, etc)
+ troubleshoot of shiet that don't work, (remove parts to get to - reinstall)
+ troubleshoot all the codes that your going to throw. (think about the entire harness again and wtf you did wrong or MIGHT'VE re-wired wrong)
+ THEN troubleshoot all the electrical gremlins (like why your door-chime is going on with the door closed).

And your telling me that's going to take 5 hours? You might be able to drop the motor + tranny in 2 nights but electrical work is another story. Electrical fabrication + troubleshooting is another ballpark y0.

Excuse me for being honest. Good luck - your going to need it.



[Modified by RotaryBzzz, 9:50 AM 2/6/2003]

 

hey no harm taken bro.
well if you know how to read all that wiring diagrams and stuff it should manily be very simple. (not that i know how) but my friend does

yeah concidering the trouble shooting and stuff it might take about 3-5 days..hehe
damn the wiring