I was wondering what are the pros and cons of each? I need a chipped ecu on my semi high comression motor, ~11.7:01. I think i remember someone saying that the p28's don't have a knock sensor. And so if i'm putting in a fuel thats of a lower octane, it won't retard the timing to prevent detonation? Besides cost, what are the pros and cons of both ecus? I see p28's go for around 130 while i see p72s go for around 250. Whats so special about the p72's that makes them almost double the price?

 

P72 is OBD2 (I'm pretty sure). P28 is OBD1.

P28 doesn't look for the knock sensor. You can also chip an OBD1 ecu, whereas OBD2 is harder to do and no one likes doing it.

If you use P28, you need to convert to OBD1.. unless you are already setup for it..

 

There are obd1 and obd2 P72 ecus. A p72 is simply a integra gsr ecu. Its nice since its already set up for dohc specs, and has the knock sensor. As far as the P28 thats a 92-95 civic si ecu. The thing to do would be to get a P28 and send it to ericks racing and get them to chip it to ITR specs for $150 dollars. Good luck.

 

yah I thought there could have been an OBD1 p72... wasn't sure..

 

nameless u mean to tell me with over 2000 post that u think their might be some p72 's that are obd1

 

you shouldnt have answered at all.

To answer the question:
P72 ECU controls two stage intake manifolds and has the hardware to read
a knock sensor. Thats why it costs more. P28 or P72 doesnt really matter
as long as its chipped for your setup. If you arent running 91+ octane on
that setup then you deserve it if it detonates and blows up on you.

 

I don't think you should have edited this post either. (you did, and you made it seem like you didn't by deleting the "edited by..." part.

Why shouldn't I have answered? Because I didn't know/wasn't sure? I didn't say anything about the detonation ****.. because I don't know. So in other words, I didn't answer.

edit: I had forgotten about the IAB stuff too... but I don't think that would make the ecu more expensive or valuable since the majority of B series engines don't have that manifold.


[Modified by Nameless, 7:30 PM 2/4/2003]

 

You mean to tell me you came into this thread just to say that? Where's your input? No, I don't have a GSR engine.

 

Yeap. which describes pretty much your entire post.
Better not to post at all rather than propagate more misinformation.

And sorry you dont like how the board doesnt put in the "modified by" text like it
does for you. Thats out of my control.

 

Where's the misinformation that I gave? Can you point that out? Now that I look over my original post, I don't see any of this misinformation you speak of. I can only think of information I didn't give.

Notice how I put the "I'm pretty sure" next to my assumption on the OBD1/2 P72. I thought maybe you people would notice that I wasn't sure, instead of wasting time talking about it like the first ignorant moron did. (who also did not contribute jack **** to the thread)

Seriously, some of you people with the upper class attitude here on H-T like to think you are genius's and that no one else has the right to post information. Look at my posts in my history and you'll probably come to the conclusion that I'm not an idiot, and I don't "propogate missinformation". If I do, I can always count on someone to point it out nice and clearly.

 

The P28 is, of course, cheaper. But it does have its disadvantages. First of all, it MUST be reprogrammed to run ANYTHING other than a D16Z6/D16Y8. The P72 will run a B18C right out of the box. It also reads a knock sensor (the P28 doesn't and can't) and controls the secondary butterflies.

 

Thanks for the info guys and sorry for stirring up any conflicts. I never have put anything in my tank other than 91 (thats the most we get in cali) and i've had no problem so far. I've always been paranoid that the gas station might have a messed up pump and feed me a lower octane by accident. In that case, it'd be better to have the p72?