Will F22B dohc run right on a H23 Ecu?

[HondaMechanic]

Hi guys, I know this should be posted in the technical forum threads, but since I'm a new member I can't do it yet. I'm going to swap an F22b dohc that I recently purchased into my 1990 accord this summer. What I was wondering is the P14 ecu from a H23 a suitable substitute for the P39 ecu which comes with F22b dohc? I know this can be done due to research I've done on this site, but how well will this combo run the motor? Will I get the same performance or close to same performance as I would with P39 ecu? Thanks for your input.

[deevergote]

Hi guys, I know this should be posted in the technical forum threads, but since I'm a new member I can't do it yet. I'm going to swap an F22b dohc that I recently purchased into my 1990 accord this summer. What I was wondering is the P14 ecu from a H23 a suitable substitute for the P39 ecu which comes with F22b dohc? I know this can be done due to research I've done on this site, but how well will this combo run the motor? Will I get the same performance or close to same performance as I would with P39 ecu? Thanks for your input.

This IS the technical forum for anyone with less than 30 posts... and you'll actually get better answers here (because anyone that flames you and doesn't help will get banned!)

The P14 won't be right, obviously. It'll run, and probably do so without doing any damage, but it's not right.

Most people I know just use the PT3 or PT6 from their F22A.

[HondaMechanic]

But aren't the H23 and the f22b dohc very similar engines?

[Hondateck2010]

yes but diffrent spec's one is JDM other USDM

[deevergote]

But aren't the H23 and the f22b dohc very similar engines?

Different displacement, different compression, different internal composition. I believe the injector size may be the same (I haven't looked that up)

It's probably closer to the F22A than it is the H23A1. Spec-wise, it kinda falls right in the middle.

No ECU from any other engine is going to run it 100% correctly, though the PT3/6 or P14 will do the job well enough.

[Father Time]

JDM F22B DOHC ecu is the p39. Heard they were hard to find though.

H23 also has a knock sensor that the F22B DOHC does not have as well. So you would have to wire one up IF you chose to do that.

I used my pt3 for a while when I did this swap and though it wasn't putting putting out the full potential of the motor, I did not have an issue with driving or idle. The only issue I had was the pt3 ecu doesn't support the IAB's and also caused the motor to run a little on the rich side.

Others have had better luck with the pt6 ecu as it has the capability to control the IAB on it.

Bottom line: I would use the pt6 rather than the p14 or pt3 till you were able to get your hands on a p06 ecu and get it chipped and tuned. NOT JUST A BASEMAP! TUNED like dyno tuned or the tuner sits in your car and tunes you while you drive.

[HondaMechanic]

Couldn't you just run the F22b dohc without a knock sensor because it doesn't come with one originally, if you used the P14 ecu?

[Father Time]

Couldn't you just run the F22b dohc without a knock sensor because it doesn't come with one originally, if you used the P14 ecu?

No, because the p14 will look for one and will not find it and throw a code and run like crap.

[deevergote]

The ECU cares about the knock sensor, and that's what matters. Run a P14 on a llama and it'll look for a knock sensor.

[HondaMechanic]

That would make sense that it would throw a code. What is a llama? Is it some sort of piggyback system or coversion harness?

[project93]

That would make sense that it would throw a code. What is a llama? Is it some sort of piggyback system or coversion harness?

i believe he was referring to this:

[deevergote]

Yes, that would be a llama. And generally, they do not have knock sensors.

[chessboxer]

Can I just wire one up on my llama though? I got a really good deal for one with no rust on craigslist.

[NWaccord]

You Probably better with a chipped ecu with a basemap, eliminating knock and egr sensor! Then tune in the future.

[deevergote]

Can I just wire one up on my llama though? I got a really good deal for one with no rust on craigslist.

No rust on a llama? Man... we don't get em like that up here! You better jump on that like the Lone Ranger on Tonto during those lonely, lonely nights...

You Probably better with a chipped ecu with a basemap, eliminating knock and egr sensor! Then tune in the future.

A basemap is a bad idea. Running a stock ECU that isn't 100% right is a MUCH safer alternative to a basemap. Basemaps are intended ONLY to get the car running to be tuned. They are not to be driven on.