pgmfi.org

As said does anybody know the difference between these two ECU's

Do both have knock sensors?

Thanks, Paul.

jdm 000
edm eoo

and yes

x00 what is that then? is there any major difference in these ecus?

Well as I have both in bits on the table in front of me, I can say
that the PW0-000 is the JDM CRX SiR which has a separate knock
board.

The PW0-000 is in the UK (I don't know about other countries as well)
CRX VT. It does NOT have a knock board, but it does have an
atmospheric pressure sensor on the board, which the JDM one
does not.

Hope this helps.

Tink!

i have a crx vtec
if i have a atmospheric pressure sensor in my ecu, how would the car act if it is broken? my car is a little strange, the rpm goes up and down when i rev past 2000 rpm

The PW0 ECU need to know the mass of air coming into the engine to
calculate the correct mass of fuel to inject.

As the PW0 doesn't connect to a sensor that reads air mass directly,
it must calculate it from other sensors.

It uses the Manifold Absolute Pressure (MAP) sensor to calculate the
air mass, but it would only be an accurate calculation at a particular
density of air.

As the air density varies with temperature & atmospheric pressure you
need to compensate for this with the signals from the Intake Air Temperature
(IAT) sensor and the Atmospheric Pressure (or Baro) sensor where
fitted.

If either one of these sensors is off or faulty, it will cause a general leaning
or richening across most of the rev/load range (not sure about WOT).

I would guess if your ECU did have a Baro sensor and it was faulty
or leaked, etc. then you would probably see a bigger effect at higher
altitude. As the air is thinner and less dense at high altitude, then
you would expect the fuel to be leaned out to match it, but if the
sensor had a leak and only read sea-level, then you would over-fuel
more and more the higher you went.

I wondered why the JDM ECU didn't have a Baro sensor but the Euro
ECU did, and I wondered whether Europe/UK is generally more mountainous
than Japan, so there might be a greater range of atmospheric pressure
to cope with than in Japan. As I'm not particularly into geography I
haven't looked into this in detail.

I believe that an ECU with a Baro sensor should be able to give more
accurate fueling under a wider range of conditions than a non-Baro ECU,
as the Atmospheric Pressure would have to be guesstimated on a non
-Baro ECU.

I shall tinker further with my ECU's as time permits.

Hope this explanation helps.

Tink!

ok,
if i have one, can i se it if i open the ecu?
is the pw0 x00 a jdm or a europen ecu?

Thank you very much Tim, much appreciated.

I look forward to reading more of you threads in the future.

(always good when things are explained in Leymans terms)

Paul.

Tim - The PW0-000 Reads from ADCR4, can you tell me where this signal goes? It might be possible to transplant a Atmospheric sensor into the pw0-000

Let me know what you think...
Si.

As I understand, a EDM PW0-X/E00 ecu will not run EDM PW0-000 code.
Although sharing the same engine, the JDM EF8 run a tighter factory tune compared to the EDM EE8. (+10HP)

If I copy the fuel/ignition tables (and other settings like vtec engagement) from the JDM bin to the EDM bin, would it run the same?

Did you tested it already?

I just did this to my PW0-X00. Maps and VTEC crossover. It drives more aggressive and quite noticeable, the vtec crossover is much smoother, to a point where it is hard to tell when VTEC engages by just listening to the engine. I have no access to a dyno so I cannot confirm it has actually gained some ponies, but I would be surprised if it hasn't.

- NovaVTEC

That would be great to know No agressive VTEC coulb be from better performance, smooth transition. If someone has a before dyno and after... would be awesome.

Thanks for you answer

I wondered why the JDM ECU didn't have a Baro sensor but the Euro
ECU did, and I wondered whether Europe/UK is generally more mountainous
than Japan, so there might be a greater range of atmospheric pressure
to cope with than in Japan. As I'm not particularly into geography I
haven't looked into this in detail.
[/quote]

tim, ecus that do not have an internal PA sensor(BARO) use an external PA sensor usually mounted near the ecu with a single 6mm bolt. And to further complicate things, OBD2 ecus dont have an internal or external PA, they take a reading from the MAP in the milliseconds it takes you turn your key from "RUN" to "START" to determine baro at the time of start. Just a little useless information.