Hi, one for the Hondata tech guys out there....

I am about to place an order for a Hondata 4b for my PW0 ECU, which uses two primary oxygen sensors (1st gen B16A). Can anyone tell me if i can feed the output from my wideband O2 sensor into the ECU and use it to help me tune with the target lambda feature in Romeditor?

Hondata only show how do this in the manual with the later ecu's which use a single heated primary O2 sensor, not on ECU's that use two primaries.

Also, how do you get around the problem of having to fit two primary O2 sensors with a turbo, where they will be exposed to the exhaust gas from all cylinders and not their respective pair?

Hondata say this makes the engine either very rich or lean, can i just compensate for this with the tuning or is there a better solution?

Many thanks for your help,

Mark


[Modified by marklamond, 11:42 PM 8/8/2002]

 

I would recommend that you swap your ecu for a p28, p72 or p30. It will make you life alot easier.

 

Hehe, i knew someone was going to suggest that. The thing is i actually want to use my PW0 on my ZC engine which i can see no problem in as all i have to do is set my VTEC entry point at max revs to disable it, plus some wiring changes etc.

It would mean having to buy another ECU to fit the stage 4b to, which is no great problem but changing over the distributor might. I know lots of people with the early gen B16A's swap for the later distributor to go to OBD-1, but how i would get it to fit on a D series i don't know, i'll have to take a look. I have a spare B16 distributor, but it's the early type for use with the PW0

The other problem is finding a distributor over here, as they break so often they normally dissapear from scrapyards in an instant.

Perhaps it would be better to forget about using the PW0, can you recommend an ECU to use as a core for a stage 4B that would be better suited to running a ZC - perhaps from an OBD-1 D series?? I'm probably over complicating things using a VTEC ecu. Do later D series engines use a different pickup in the distributor compared to an early ZC?

Thanks, i really appreciate the help!!!

Cheers,

Mark.


[Modified by marklamond, 9:54 AM 8/9/2002]

 

Damn, the P30 / P28 ECU's we have over here in the UK end in G00. Here is what hondata say about this:

"The G00 usually indicates that the ECU is Asian, and so may not have the barometric sensor nor other circuitry normally found in a P28, so the ECU may not work with Hondata. It may be best to source a P28-A or P28-L ECU. "

Damn..... back to the drawing board. Looks like i will have to live with the PW0 unless anyone else has any ideas???

Cheers,

 

Ive researched this for a few months because I am also stuck with OBD-0.
The bottom line is youre better off converting to OBD-1 like G3-TEG said.

The early PW0 & PR3's use two oxygen sensors arranged to read one cylinder pair per oxygen sensor. One sensor for cylinders 1&4, and the other sensor for cylinders 2&3. The mixture for each cylinder pair is tuned separately. It is important not to wire the sensors around the wrong way, otherwise one cylinder pair will run lean, and the other pair rich. It is also important not to wire one oxygen sensor into both sensor inputs, otherwise the engine will run either very lean or very rich. You cant have both sensors in a same primary tube or the downpipe either. The idea is to tune for partial throttle which is probably 90% of our driving (unless your car is full race). Anyhow, you must have good partial throttle tuning, in order to have good full throttle tuning.

Zdyne One Wire conversion: havent heard anything good about it.

If you convert to OBD-1 you wont be limited to any exhaust manifold option.

 

Damn, looks like i will have to source a US spec P28 or P30 from somewhere and mod a OBD-1 distributor to fit.

Anyone got one lying around they can send to the UK for some $$$??

I'm going to call Hondata anyway tonight to make sure it won't work on a UK spec one. If i have to add components to the PCB, the so be it.


[Modified by marklamond, 2:28 PM 8/12/2002]

 

theres this guy on ebay selling a bunch of them for 139.99 shipped in the us...but he say he will ship internationally for extra money...i emailed him about getting a p28 myself and he said he had a very big supply so if money is sent he will ship out as soon as he gets it.

here is the link: http://cgi.ebay.com/ebaymotors/ws/eb...940952&r=0&t=0

NOTE: i do not know this guy. he is just someone i found on ebay and is in the process from buying a p28 from. so im not sure if he is legit or not


[Modified by areyouasian, 12:07 PM 8/12/2002]

 

For your ZC i would recommend P74/75 ecu since its non vtec.
I have used that to run DOHC ZC motors and all that needs to be done
is the harness adapter and a little modification to a late model integra distributor
to make it fit.

 

Thanks for the info guys! :D

I have a question - can i use an OBD-1 SOHC distributor (code is TD-42U) from a D16Z6 with my P28 ecu (they both came off the same car) to drive my DOHC?

I will obviously have to make mounts up for the distributor, but that's not a problem.

 

Where did you read this, and how old is this information?

I've P30G00 (live in Austria/Europe) and Hondata Stg. 4b. Yes it's right, there where a lot of problem to get the hondata rom's to work, but now there is <U>ONE</U> program for a P30G00. I used it for several hours (for datalogging).
Maybe it's still in beta statium or other tester have problem with it ...

Doc

 

Hi,

I got this info from a guy called Robert at Hondata's main office, he e-mailed me about a week ago. I think i will give hondata a call to see if i can sort things out as asking tech questions over e-mail can take a while.

Thanks for the info Doc

 

The best will be, to speak direct with Doug. He knows about the problems with the G00 ECU's. He send me the rom for the G00 ECU.

Let us know what he's saying.

Doc