i finally got vtec kickin in after 3months of cell 22 and no vtec.im currently running an OBDII p72 but i cam across an OBDI p28 for cheap. now my queston is for a b16 which would work best. im using an ex cluster and i have yet to redline w/the p72 so im guessing it redlines around 8500? how well will the p28 work, besides chipping it does it have any other advantages over the obdII p72.

 

if you chip a p28 you can remove the knock sensor, put different redlines or non. lower vtec activation etc

 

What year is your car?

Do you want the car to be OBD1, or do you have emissions in your area that prohibit this sort of thing?

If you can go OBD1 then do it.

The P72 runs a B16A2 like ****. How do I know? I used to have a GS-R swap with a P72 ECU. I swapped the P72 into my wife's B16A2-powered 1992 Si and it ran like poop. The VTEC is too low and it has absolutely no pull from 4500-6500rpm.

I run our B16A2 and my B18C5 off of a Krnji-chipped P28 - best mod for the dollar IMO.

 

my cars a 97 civic, i live in NY and ive been hearing about that emmisions thing w/cars 96+ but here theres always a way around it, you can get any car to pass inspection w/a lil extra cash , if not ill just switch it back to 0bd2, w/a plug n play jumper harness.did the p72 really run thaty bad? i think it runs pretty good, but then again im off of finally hearing vtec. the p28 is a virgin p28, i was thinking of chipping it but i hear they run rich, are there any websites such as http://www.efituningforless.com/ that can chip my ecu? will a virgin p28 even run better then a p72?

 

Hey Tom welcome back!

For the poster, why are you running a P72 on your B16 anyway? I dont understand why people think the P72 will help make your B16s faster, because it wont, you dont have the secondaires or anything else the GSR has. Leave the p72 in a GSR.

If you want to use the p28 you need to chip it because it wont run on your car, your car being a DOHC and the ecu is for a SOHC. Now if you get it chipped thats a whole different story but youll have to convert to OBD1 though, which will be alot of work.

I think best thing to do is just get a OBD2 P30 (i believe thats the number), which is a B16 ecu. That way it will run how its suppose to. Now if its built again thats another story, and it would be better to convert to OBD1.

 

im running a 97 p72 on my 97 civic because the 00 si ecu wouldnt be as easy to use. a del sol b16 ecu is 0bd1 any way, it would not run on my obd2 car and engine, only the p72 will (that i know of).

i just happend to get a hold of a p28 for dirt cheap. i just recently borrowed my cuz's 0bd2 to 1 jumper harness and i tested out the p28 but before i fixed my vtec prob. and it was running fine just not hitting vtec because of code 22.

actually its more of a problem to go from 0bd2a(97 civic) to 0bd2ab (00si) then from obd2 to obd1.

i have yet to try out the p28 now that i fixed my pressure switch but does it not engage vtec on a dohc if its not chipped or does it not run at all cause it was running fine when i had no vtec.

 

You can run either the 96-97 Del Sol VTEC P30 OBD2 ECU or the 1997 Integra Type R ECU if you must remain OBD2A - both will plug right in and run the engine much better than the P72 ever will.



Pssst!!!

The 96-97 Del Sol VTEC came with the OBD2A B16A2 engine in it! Only the 94-95 Del Sol VTEC was the OBD1 version here in the US, which was a B16A3.

Also if emissions are no bother then run the OBD1 P28 with a DOHC program in it!!! It will run better than OBD2 and it will be sooo much less likely to throw bullshit check engine lights like:

"Catalyst efficiency low"

or

"Secondary 02 sensor heater"

or

"VTEC malfunction"

or

"Random misfire"

etc, etc. OBD1 rules - PERIOD.

 

oh ok thnx that helps alot, i didint even know there was a 96-97 del sol. in that case im looking for somone to chip my ecu. and i now have a p72 4sale

 

Not trying to jack the thread but........... I am about to drop a b16a2 out of a 2000 civic si in my 96 CX Hatch. What engine harness can I use to make the swap the simplest. Can I use a 96-98 EX engine harness, without rewireing anything? I also plan on running a chipped p28, so ill be using a obd2 to obd1 harness adapter, and ill need to get my ecu chipped. Where can i get the Krnji chip and how much is it?

Oh, I live in South Carolina so emissions is not a problem.

 

i can help u there, lol, u can either
1)use a 96-98 ex harness Pros:wired for vtec already Cons:hard to find
2)re wire ur existing cx harness for vtec Pros:you already have it!! Cons:you have to addd wires for vtec and other stuff

i just let the person swaping in my engine rewire my stock ecu


oh and for the chipped p28 thing ur gonna need an 0bd2 to 0bd1 jumper harness, and i think its a typo im pretty sure its kenji, but i dunno im lookin for that too. or if u want to stay obd2....i have a p72 4/sale

 

Cool, now I gotta find a harness.

I alreaddy have the p28, but i appreciate the offer.

Do you know if there is a difference in the jumper harness, like is there on specificaly for obd2b to obd1 or obd2a to obd1?

 

yea actuall there is, u and i both need the obd2a (96-98 civics) to obd1 harness, i ordered mine from lightning motorsports, i have yet to recieve it but my cuz did and i used his and its a direct plug n play. 75 shipped not bad

 

Thats not bad at all.

Doesnt the engine harness run directly into the inside of the car and plug into the ecu on our cars? If so wouldnt it be possible to use the SI harness and an obd2b to obd1 jumper harness? Just something ive been wondering.

If not, at least I now know pretty much what I need to complete the job.

Oh yeah, one more question, what axles did you use?

 

yea it would make sense if u had a 00Si wiring harness right? y not? but i was told that i couldnt use it, when i did my swap i had a 00si wiring harness and ecu. but then i was told that it wouldnt be worth the trouble, i think it has to do w/the fact that the car is 0bd2a not 0bd2b cause there are other wires in the car, if u had a 00 cx it would work. so they just rewired my stock one, i also have a 00si ecu for sale now , but yea if u just jump into doing a swap theres alot of things ur going to learn, as for axles i think any bseries ones will work. i used 00 si ones

 

Yeah, Theres definetly alot to learn, Thanks for the info man, I really appreciate it.