P28 or S300

[HondaGee]

Hey guys,
I just recently purchased a DC2R with a little work done to it. I just found out yesterday that this car was running all it's mods on a stock ecu hence it was said that it had a reflashed ecu. Anyways getting to the point I need to buy a ecu for the car now and I just wanted to know the difference between a S300 ecu and a P28 ECU, all I know is tat the P28 comes out of a civic vti. Please do enlighten me with the information that I need. I will be buying the ecu and tuning it also (obviously, but just a heads up haha).
Thank you

[HondaGee]

Btw guys I was told to buy a P28 for my dc2r.
Thanks again.

[Monetz]

P28 is only stock OEM ECU
The s300 is a plug in module to the OBD1 factory Honda Engine Computer (ECU) which vastly expands the capabilities of the factory ECU. Forced induction, datalogging, real time updating of parameters is the best tuning chips go into P28 chips board.

what i can see here you got told to buy a packages of Hondata S300 that has been install into P28 ECU.

[HondaGee]

Exactly haha that's what I got told. Wouldn't it be cheaper just to buy a S300??

[shepparton]

you need them both lol... s300 chip em in p28 ecu

[mugen_ctr]

you need them both lol... s300 chip em in p28 ecu

and also a 3 Bar sensor to replace the oem if ur boosting as well

And OP BTW, jus FYI, all cars from 96 - 98 are OB2a ecu's from the factory which u "can" so be reflashed, but obd2 chips all use a one time flash chip, which is pointless if ur always upgrading engine parts and need a tune, hence why obd1 ecu are the way to go, as they have provision to allow for a chip that u can access and reflash anytime anywhere for mods, if they told u its a reflash its gonna b a OBD1 ecu chipped or a stand alone ECU of some sort.

[ECU-MAN]

Hondata S300 is not an ECU. It goes inside the Honda OBDI compatible ECU (B, D series ECU's) and makes that ECU tunable

[Adrian @ SAS]

Your DC2R is OBD2a & it is extremely unlikely the ECU is modified in anyway.
To use Hondata S300 system, you will need the following:

P28 ECU
Hondata S300 kit (fitted to above mentioned P28 ECU)
OBD1 to OBD2a crossover loom.

Contact JDMYard for these - probably instock

[HondaGee]

Thanks guys just purchased my ecu so now just need an adapter...btw guys bit off topic I just got my clutch rreplaced about 4 pm today haha, and umm the car started to crunch into 4th gear while I shift at 4200 rpm on third. Would you guys help me out? Please
Thanks.

[infurNOS]

Thanks guys just purchased my ecu so now just need an adapter...btw guys bit off topic I just got my clutch rreplaced about 4 pm today haha, and umm the car started to crunch into 4th gear while I shift at 4200 rpm on third. Would you guys help me out? Please
Thanks.

Try creating another thread in different section for seperate issue.

[HondaGee]

Alright man thanks for the heads up :D

[dougie_504]

What modifications has your engine actually had done to it to require a new ECU?

[HondaGee]

Cams exhaust and cai

[Super-DA9]

Cams exhaust and cai

More specifically, what camshafts?

unless they are a drop in unit it is not wise to run cams on a stock ECU.

[dougie_504]

Camshafts I assume. Cam gears? Valve train? Any port work?

Go ECU.

[HondaGee]

Na man just those bro :L I've got the receipts actually and does not state any apart from the cams

[Super-DA9]

Na man just those bro :L I've got the receipts actually and does not state any apart from the cams

Yeah but WHAT TYPE OF CAMS as I asked earlier. Unless they are a 'drop-in' type of camshaft then you are going to have issues without a tune.

I'm repeating myself here..

[dougie_504]

Give us a brand and proper item description.

For example:
Skunk2 Pro Series Stage 1 intake + exhaust camshaft.

[HondaGee]

Loll relax boys calm down...they have no brand the previous guy got regrounded cams...

[Monetz]

Loll relax boys calm down...they have no brand the previous guy got regrounded cams...

every aftermarkets cams should have a brand bro or mayb your previous still use OEM type R cams and say shit that he have a cams and babababah to make u interesting about that car.

p.s. we just try to help you out with a proper tuner and correctly way without issue.

[Super-DA9]

every aftermarkets cams should have a brand bro or mayb your previous still use OEM type R cams and say shit that he have a cams and babababah to make u interesting about that car.

p.s. we just try to help you out with a proper tuner and correctly way without issue.

This guy is right. If the cam changes more than mildly on a standard ECU (no tune) then you will have issues. If your car is producing a good powerband on a stock ECU it's highly doubtful they have changed much if at all.

You can't really call a light regrind "cams" as it's misleading.

In this case you wont gain a lot from a tune. Stock B series generally only get 5-10kw out of a tune. I would suggest upgrading things like the cams (actually buying proper cams) and an uprated valvetrain to make the money you spend on a tune worthwhile.

Think about it this way, including the price of a Hondata S300, ECU and a tune you will be spending well over $1000 for very light gains with the engine as it is now. Is that what you want?

[HondaGee]

Sorry boys completely understand my bad, anyways I already got everything done and on it's stock ecu the car was pulling out 124 atwkw after the tune I'm pulling out 137kw so for a fact I know that I've got cams I'm sure headers, mugen twinloop and an injen CAI won't give me just that much...my tuner/mechanic said that he got the oem cams and filled them to be slightly larger then what they are and that's all it was...also later on to fully be on the safe side might buy proper or upgrade to better cams also...

[HondaGee]

He as in the previous owner

[Super-DA9]

who was the tuner?

[HondaGee]

I prefer not to give names man what difference would it make...I'll just say it's not byp...

[Super-DA9]

well I'm sure a lot of people would want to give them their business if he can pull that number from a B18C with mild mods

[infurNOS]

well I'm sure a lot of people would want to give them their business if he can pull that number from a B18C with mild mods

agree.

[HondaGee]

Hmmm...why? Is it hard to pull out that much on just exhaust, cai, and regrounded cams?

[Super-DA9]

Hmmm...why? Is it hard to pull out that much on just exhaust, cai, and regrounded cams?

Yes. 137kw atw is really high for a (basically) stock B18C. There are people with entirely worked B18's making that much or only a few kw more.

If he was able to get that figure from that engine then he must be worth some $$$.

Got a dyno sheet print out? I'm very interested to see the power curve.

[u mad?]

Hmmm...why? Is it hard to pull out that much on just exhaust, cai, and regrounded cams?

yeah, really unlikely.

[dougie_504]

If you were making 124KW prior to the tune TBH that's the kind of power most people would expect AFTER the tune.

So either you have a B18C that is compressing like brand new and the previous owner got the cam's reground to be VERY aggressive (which would cause valvetrain issues) or alternatively your tuner has blown a little wind up your ass.

Both are plausible. I suppose people would like to know who tuned your car because maybe it's a dyno that we already know reads high, or it might be a tuner that we know and trust etc...

[HondaGee]

I'll take photos later, and honestly I don't know man honestly the car pounds hard so I'm happy loll thinking of taking it to the track soon anyway and see what I run...the previous owner said he hit a flat 14 at 124kw...so well see how it goes :L

[Super-DA9]

http://i1213.photobucket.com/albums/cc464/meersburger/op-will-surely-deliver-lets-just-wait.jpg

[u mad?]

http://i2.kym-cdn.com/photos/images/original/000/585/507/e5e.gif