just wondering if anybody know if there's a difference in the ECU besides the it being pr3 or pwo! Is one better than the other to use? i need to know cause it will be used on an 88hf with b16a siR crx motor! I can use either one for the swap thats why! any information is usefull ...thanks

 

? is there a u.s pr3 ecu and if so what car does it come off?

 

pr3 has an available slot for chipping as in like a mugen or jun program, you can chip the pw0 too, but not as easily.

btw.....chips are garbage...don't fall for them. they do what they're intended to do but the actuall performance gains are questionable without serious tuning. more people mess their car up with them then better it.


[Modified by -Ghostbuster-CRX-, 1:05 AM 1/4/2003]

 

The Pr3 is more widely supported by the "aftermarket." If you have the option, get this one. I think the specs are the same for the M/T version.

 

I don't about chips being GARBAGE... I have a standard pr3 for daily driving and use a pw0 chipped by LOCASH RACING for racing. The chipping allowed me to change my vtec x-over and alter my rev limit and fuel mapping and it still uses all the sensors so if something DOES go wrong my computer will still throw a code to tell me. I just talked to the company that does the chipping and went with a program that made the most power with my type of setup. It DID work well, IMO and it was MUCH more affordable and easier than getting free standing system or vafc.

IMO, if you mess up your car installed an ecu that chipped professionally than you shouldn't be working on cars. It's easier than changing oil. You just have to understand your setup and what program you need to run. If you change your setup than perhaps you should change your program.

 

teh pwo came in the EFs the pr3 came in the integras

 

No thats not what I meant. Joe burns roms, and is a proffesional at doing it. I am talking about the kids that go online and see a chip for auction on ebay and just buy it, not questioning the truthfullness of the exact chip specifications.

Changing oil is easier then pulling up your carpet, unbolting the ecu bracket, unplugging, getting a screw driver to open the case, and then locate the pin section your dealing with....only to pop in the chip, repeat the process to put it back in, and then who the hell knows how your engine management sys is really responding to its new found instructions??? No, changing oil is not easier. Only a technician with the proper software would be able to note improvement in power and efficiency.


[Modified by -Ghostbuster-CRX-, 2:36 AM 1/4/2003]


[Modified by -Ghostbuster-CRX-, 2:37 AM 1/4/2003]

 

You're right... chipping an ecu YOURSELF isn't easier than changing oil... but removing it to have A PROFESSIONAL do it IS! That's what I was saying.

I totally agree with you about Ebay chips and doing it yourself. If you install a chip yourself that you bought from Ebay you probably don't have the greatest amount of common sense OR respect for your car.

I still would recommend having your ecu "chipped" by a professional company, it's worked great for me and so many others I know.

 

so basicly back to my question! U guys dont thinks there's a difference in the ecu's?? cool! and the PWO is for ef and pr3 is da...is that correct?? and the funny thing is the PWO ecu is chip ready speaking of chips! but the pr3 is untouched..

 

The PW0 only needs one O2 sensor.

 

I dont know where you guys keep finding this, but both PWO and PR3 (stock ECU's) need 2 o2 sensors.

PR3 = XSi (DA Integra)
PWO = SiR (CRX/Civic)

 

an educated man with an educated post. i like it.

Now for my $.02. I have run both computers and can offer this bit of advice. The PW0 has an 8000 rpm red line. i noticed it produced more bottom end power over the PR3 and seems to drive ( not race ) better than the PR3. Now the PR3 has a 8200 rpm red line and obviously produces more top end power. but with my old B16 i noticed an idle problem and less torque with this computer. I would say use a PW0 ecu with a stock or minorly moded B16 that is used mostly to get around and does little or no drag racing. Now if the car is to be raced and lets face it. we all beat on or cars. get a PR3. Not only that but i would get a chipped PR3. Personally i would send mine to either Locash and have Joe do it or to jdmhondaparts and have J Katman chip it. since these are the only 2 people in the US that i havent heard any complaints about. hope this helps

 

wow useful information thank you! interesting too!

 

You say that the PR3 has a slightly higher redline than the Pw0? Has anyone verified this? Seems silly to me that the Integra X-Si has a higher limiter than a CRX SiR...

 

for the past two days I had my friend use the PR3 in his crx w/b16a! he normally uses a PWO! he said that the PR3 redlined at 7,900,8,000 and didnt pull even as hard as his PWO! he raced his friend that he normally pulls away from and didnt! his car is always tuned up and maintains it very well so I felt his car would be the best to do a this experiment on! none of these ECU's are chipped! interesting! lots of different from people comming in!

 

My brother uses a Pr3 and his limit is stock, and is at 8200 RPM. I just assume that the M/T Pw0 should be the same.

 

i can remember watching my fields bounce from 78-80 with the pwo and the pr3 bouncing from 79-82. the other thing is this. the JDM EF clusters have a red line at the 8000 mark. while i believe the JDM DA cluster has a red line just after the 8000 mark.

 

If anyone is looking for a performance chip, I have a few performance chips I could provide. I also the necessary soldering skills if anyone needs to have their ECU socketed.

 

I ran a PW0 in my own car until just recently.
PW0 does indeed have an 8.000rpm rev limiter, which you can verify with the rpm readout on a vafc. There has always been an argument on whether or not the PW0 only needs one 02 sensor, and from my personal experiance it does.
My ecu never threw a code with a single 02 and factory wiring. I unhooked the single o2 just to test, and it did throw a code. Apparently it was perfectly happy running with a single sensor. Always idled perfectly and ran clean with no a/f problems.

Its more than possible that there could be differences in the various year PW0s floating around, just like there are differences in the USDM 88si computers.

 

I'm willing to bet that the PR3 that you had your buddy run in his crx that reportedly sucked with a 7800rpm redline was an automatic tranny version. They have a lower rev limit and less agressive fuel maps. I have the PR3 and it's cool. I think Honda's logic behind giving the integra a more agressive compter is as follows. The integra out weighs the EF8/9s considerably so a more agressive program is given to sort of equalize them. I mean this is the exact reason why JDM tegs have shorter geared trannies, wich brings me to another point, the rev limit would have to be higher on teg computers because they're geared lower. I know that by design the EF siRs out perform the integra Xsis but you have to admit Honda did try to level the feild a little bit. One more thing, i guess back in the EF days, in JDM land a popular upgrade for siRs was to swap out the PW0 in favor of the PR3 ecu .

 

Just for anyone who cares, I have a (manual) PW0 ecu and in the past I've disconnect both o2 sensors and it never threw any codes, and I've disconnected just one to test that too, and it didn't throw a code. But my auto PR3 ecu will throw a code if you just disconnect one. They are not chipped.

Rob

 

I had a pr3, then put in a pwo, and I got a code 2 that I cant get rid of? What do you all think? Ryan

 

here's a question! Can u tell if its an auto or man by #'s or any visual lettering on the ECU? thats wierd about the redline tho...the pr3 was like 7,900 or 7,800 i guess and the PWO was 8,200...lots of differnt ecu 's floating around...I'll prob just stick with the PWO!