Which ECU for F22B DOHC head Swap?

[Mishakol129]

I have a F22b dohc head swapped on my F22a engine for about 4 months now using the PT6 ECU. My question is about which ECU I should be using. I have tried both the PT6 and the P39 ECUs. My observations are that the PT6 ECU runs the car a lot faster with more torque, but the P39 makes the car slower. Which ECU is best to use? I figure that the reason the P39 (which is the JDM ECU for the F22B DOHC engine) runs the car slower than the PT6 is because of the compression ratio difference between the F22a and the F22b DOHC engines, 8:8:1 compared to 9:5:1. So, based on this should I run the ECU corresponding to correct compression ration, OR should I use the ECU for the cylinder head (DOHC)??

Mind you that I am going to be putting the DOHC head on an F23 bottom end so that should give me about 9:5:1 compression with the head already milled 0.015". Same as the F22b DOHC. Thing is, I just want to know what ECU I should use as of now with my setup, right now I don't care about power I want MPG's and reliability. The car has been bogging down when cold up hills on the PT6 ECU. It could be because its not for DOHC, IDK. It would help if someone could give me some insight into this. Thanks.

[cb9love]

you know you need a chipped computer,
that's a hybrid/frankenstein motor, there is no factory ECU that will run a custom motor build.
If you wanted mileage and reliability then you would have left the factory motor in it.
you want a DD project car that gets horrible gas mileage and goes fast.

[dj_ender]

He knows that, he's looking for confirmation on a short cut.

[Mishakol129]

you know you need a chipped computer,
that's a hybrid/frankenstein motor, there is no factory ECU that will run a custom motor build.
If you wanted mileage and reliability then you would have left the factory motor in it.
you want a DD project car that gets horrible gas mileage and goes fast.

This wasn't really what I wanted to hear, a chipped computer is out the the question right now. Based on the facts I have given, which ECU should I run, the PT6 or the P39? I know you guys are smarter than this and can come up with something. Should I use the ECU made for the DOHC(P39) or do I use the ECU made for the lower compression(PT6)?

Those are the only 2 options I have as of now. Those who have done this swap have used the P39 basemap chipped ECU. That really is the only option that i have even if I get a custom ECU. Unless I can get to real time tune it which as I said is not possible.

[Joey GT-R]

This wasn't really what I wanted to hear, a chipped computer is out the the question right now. Based on the facts I have given, which ECU should I run, the PT6 or the P39? I know you guys are smarter than this and can come up with something. Should I use the ECU made for the DOHC(P39) or do I use the ECU made for the lower compression(PT6)?

You didn't want to hear it because it was the truth. Instead of wasting your money on a PT6 and a P39, you should have just bought a chipped P06 and got a tune. But no, you wanted to take the "Easy Route" and now you're pissed because you don't make any power. I hope your rings burn in hell and your bearings go to the moon.

dj_ender may not have considered it but I am considering deleting this thread. Some future person behind you may mistakenly think this is what building the right way looks like when it couldn't be any further away from that concept.

[sonikaccord]

Why can't you get a chipped ecu? Or chip the PT6?

We are smart enough to know not to run a stock ECU on a hybrid motor. Go with the one that's least likely to blow your motor. You're going to have to read plugs and listen to your engine

[ferenza]

Ive been wondering what ecu to run since I have a f22b dohc head waiting to be rebuilt.

So I would need a p06(chipped) to run the head on a f22ax bottom end?

[dj_ender]

dj_ender may not have considered it but I am considering deleting this thread. Some future person behind you may mistakenly think this is what building the right way looks like when it couldn't be any further away from that concept.

I usually leave his threads open, anyone with 1/2 a brain can tell, within a few posts, to not follow what he's doing. Plus, they give me something to laugh at.

[Mishakol129]

Ive been wondering what ecu to run since I have a f22b dohc head waiting to be rebuilt.

So I would need a p06(chipped) to run the head on a f22ax bottom end?

There's this one guy (Honda Fan) who said to use the P39 basemap, but he said you CAN also use the PT6.

[Mishakol129]

I usually leave his threads open, anyone with 1/2 a brain can tell, within a few posts, to not follow what he's doing. Plus, they give me something to laugh at.

Well not everyone has the time or resources to get a dyno tune for a head swap with stock parts. My engine is stock, therefore I use stock ecu's. Its not that complicated. I just wanted to know which one would be better to use.

After some re-assessment (swapping in the P39 and then going back to the PT6), I have found that the PT6 ecu runs the car much better than the P39. When I do the F23 bottom end swap, I will try both ECU's and see how it goes.

Thanks and sorry if I sound retarded.

[ol blue]

Well not everyone has the time or resources to get a dyno tune for a head swap with stock parts. My engine is stock, therefore I use stock ecu's. Its not that complicated.

Why didn't you wait till you had the time and resources to do it all at once?

[Mishakol129]

Why didn't you wait till you had the time and resources to do it all at once?

Because this head swap is not really a performance upgrade, it doesn't add any horsepower, maybe like 5 or 10 but that's it.

All I did was change the head from sohc to dohc. The head lines up perfectly and the timing is perfect just as the f22b dohc jdm engines. It was an interesting swap, that is why I did it. But its not like I have to go to a tuner and get a custom ecu, that would be foolish and a waste of money.

[GhostAccord]

Well not everyone has the time or resources to get a dyno tune for a head swap with stock parts. My engine is stock, therefore I use stock ecu's. Its not that complicated. I just wanted to know which one would be better to use.

If it is stock then there should be no question as to what ECU to use. However, building an engine using stock components from different engines will in turn modified it from it's stock form. Therefore what ECU you use will also have to change or be modified.

If you have no way to electronically alter or tune your current ECU's. Then may I suggest that you become familiar with being able to monitor your engine the old way. Via spark plug, exhaust gas temps and not your ass and imagination!

You have asked this same question many times now and have received the exact same answers every time. I suggest that you Google what Albert Einstein wrote about insanity.

You must keep posting the same thing because you are lonely and require attention and affirmation (troll) or you are insane.

[Mishakol129]

If it is stock then there should be no question as to what ECU to use. However, building an engine using stock components from different engines will in turn modified it from it's stock form. Therefore what ECU you use will also have to change or be modified.

Really, but the engine has the same compression ratio and fuel injection system as before, why should I need a tuned ecu? The only difference is that it has 2 cams instead of 1.

If you have no way to electronically alter or tune your current ECU's. Then may I suggest that you become familiar with being able to monitor your engine the old way. Via spark plug, exhaust gas temps and not your ass and imagination!

Okay, smart alec.

You have asked this same question many times now and have received the exact same answers every time. I suggest that you Google what Albert Einstein wrote about insanity.

You must keep posting the same thing because you are lonely and require attention and affirmation (troll) or you are insane.

Really, I have asked the same question many times, when? The only time I asked was pertaining to which ecu to use with this setup for strictly performance so I could get the most HP, not for a daily driver. Your insanity theory is pretty much irrelevant.

And before you call someone insane or a troll, just remember that its in all likelihood that you will become the same way, because when you judge someone, you will end up becoming like that person we have judged. Its just the way it works. Why does it even pop up in your mind to accuse me of being insane or a troll? We become just like the people we judge bro.

PS:

Albert Einstein was a brilliant scientist, but he wasn't that great of a philosopher.

[deevergote]

Let's not get our panties in a bunch, kids.

First off, your ECU has absolutely no idea how many cams your engine has.

It's a tossup... you have F22A compression (maybe a bit higher due to the head) with F22B valve timing. Neither is right. Neither is likely to do damage if you don't drive it hard. Hell, I've driven my car with a PT3 and an H22A ([cp]mike has as well.) It's not a good idea, but it will work.
A custom tune is ideal for your engine, however. Once you put that head on the F23 block, you'll definitely need to tune. You might want to consider trying a P14 at that point.