What's the difference between this two p28 ecu ? (suppose to be 5 speed manuel)

37820-P28-G02 (the 2 socket are already install for the powers chips ?)
37820-P28-A00

I have one of each but before chips those ecus I will appreciate if somebody give me more information.

 

the A00 one is an automatic ecu

 

I have never seen the letter 'G' at the end of the part number on a P28 ECU. I have seen L and, of course, A. But, never G.

You have any pics?

-kenji

 

I see the G leter almost everytime i've a ECU in hand.
Our P06, P28 and P30 ECU's in Europe have almost everytime the G on it.

I've seen a P28G02 once in a German del Sol. (sohc, vtec, 120 hp)

A automatic ECU is labled with a "5" after the letter. I.e. P28G52 would be a automatic ECU.

Doc

 

Are you sure the 37820-P28-A00 is for automatic, because it's was suppose to be for manuel (this is what the seller said !!!!!!!!).

 

arghh, don't make me go look at my car (i have 93 ex with p28) and it's a manual lol

I'll go out to my car in a few min and look lol

 

I will try to post for tomorow some pics of this ecu !!

Some guys said me that it's impossible to have the sockets already installs and ready for receive the chip, they said I need to install the sockets, but I really have those two socket and it's seem to be built like this (stock).

This is the full information on the Label:

37820-P28-G02
766-308423
AWR

 

my bad, i thought i had one with an A00 p28. it could perhaps be manual. but anyway, theres no difference between auto and manual since they can be converted. the one i have ends with A52 and originally came from an automatic. i coverted it to manual.

 

OK i just looked at my friggin ECU and I have a 93 civic ex being STOCK

and my ECU is a P28-A01 hmmm
o ya and it's stick, so that throws the whole thing off

 

Here's the lowdown on the last 3 digits on ALL honda ECU's.

First Letter:
A- American
G- German
J- Japanese
L- ????? (I know it's out there, but I don't know from where)

Second Number:
0- Manual
5- Automatic

Third Number:
0, 1, 2, 3.
This is the firmware revision number.

HTH

 

no difference in any of them, latin america, european, japanese all the same ... when I reprogram them they all take teh same eprom, when I convert automatic ot manual same thing too ...

Greg

 

Thanks guys for all your informations.

I have an other question for you, do you have any suggestion for the best power chip to use for my lsvtec. Do you thing I will give real power to rev over 9000 rmp and what about the advance of the timing (+3 degree)?

This is my Baby:

-B16A head with intake monifold and b18 injector
-Crower camshafts stage 2 (need dual spring and ti retainer)
-ITR piston and water pump
-Aem cams gear and cold-air-intake
-DC sport 4-1 header
-Tanabe Hyper Medaillon Exhaust system
-B&M fuel regulator and gauge
-Apexi V-AFC

 

depends on the cams and header whether you really need to go past 9K rpm. The crower cams start out no bigger that a factory billet, but crower cuts the lobes differently to change duration, lift never goes past 12mm so even with 300+ duration and 12mm lift a cam will only make peak power at 8900rpm on a 1:74 CRR motor and about 8500rpm on a 1:54 and 1:58 motor.

The Honda rom table uses the same fuel and timing value after 8975, I'm working on editing it past that as I think Hondata is able to do it, although on the HD entry table where you input a value after that threshold, I never see the timing change past 9KRPM when on the dyno and shinning a timing light while the car is running.

With the dc header and b&m regulator, i wouldnt rev past 8500rpm. Maybe lil higher with the jdm dc collector.

what do you mean by +3 degrees ? the entire timing map is modified and varies based on rpm, load, coolant tem, air temp andif KS input is avaialble (not in the case of p28).


greg

 

I really love this kind of explanation, thanks you very much !!!!

I don't really know more what's the best think to do if I want extract some good hp of my car, my plan was to find good chip and after I will try to tune this on dyno but before spend this money I want to be sure I do the right thing, I need to understand why with dc header and fpr a can't rev over 8500 and I also have 98 gsr ecu so if I can't rev more higher then gsr do you think the p28 ecu will be better then the gsr ecu. I decide to bought p28 ecu because I of the knock sensor and vtec pressure swich, but it's propably not very difficult to install those sensor.

Gsr ecu vs p28 ???

My question for the advance timing was because when I asked the specs of the chip on ebay, I received those information:

$40 for the chip kit. and the specs are: (JUN)

redline 9700 (seem to be a little bit hight !!!!!!!!!!!!!!!)
vtec 5800
+3 on timming (?????)
no speed limit

zum01@hotmail.com (ebay seller)

 

I just bought motor & trans swap with 5spd. The ECU that came out of the same car is P28-A52 from a 95 ex. Will this work 2gether

 

this is my 1st import! Im doing a d15b 2 a z6 swap. auto to 5spd swap in my 89 civic lx. my ECU is P28-A52 it all came out of the same car a 95 ex. is this all guna work good 2gether? I know ive got a long haul ahead of me.

 

 

Hi i got a p28 - C01
What is that?