C4wrx

does everyoen use this ecu for their gsr swaps? i know it has to be chipped, but can i just buy a chip for my current 94 gsr ecu? are chips hard to install to? i just need some info on upgrading my 94 ecu for my swap, thanks

hybridreams

What year is the car you're putting the motor into?

hybrider

well it does disable the 2ndarys into a single runner system, & knock sensor

obd-1 p28 and p72 so keep the p72 and reprogram it, same job is done to the p28

fowler!

I'm using this ecu right now. Basically, there is no low end torque. But up high in the power band, the ecu works fine.

C4wrx

the ecu is on a 94 gsr motor, i have the 94 gsr ecu right now, how hard is it to install a chip btw has anyone done it?

fowler!

You gotta do some soddering and stuff. If you don't know how to do it, I suggest not ruining a perfectly good ecu. Just spend the $100-150 and get it done by someone who knows what's up.

blackANESE

iTrader: (2)

If u do use the P28 on a B18C u better get the skunk2 intake manifold b/c re-chipped ECUs don't have a control for the secondary butterflys for the intake manifold which leaves them open all the time---which from what I hear isn't good.

hybrider

i dont see the point of reprogramming the p72 if your going to use the stock GS-R im, or so i think...is there like an activation switch for them? someone fill me in on what happens to the 2ndarys if you chip both the p72 or p28? are they left open? and are ment for use with a single runner IM?

as for the 2ndarys, leaving em open KILLS your low end trq, trust me, rolling around like that (before i installed the IAB system, just woke up one day and wasnt lazy) suck0red bad

hybridreams

Nothing happens to the secondaries on that P72. They will open and close as normal. The P28; however, doesn't have anything to control the secondary butterfly in the first place (which is why it always stays open *not good). So chipping is not what eliminates the secondaries.

EKen9

Any suggestions on who to chip the p72?

hybridreams

Are you planning on getting the Skunk2 IM? If so, I'd go with the P28 instead.

spankaveli

if planning on using the stock IM for a while, would one be able to get a p72 shipped to specs?

C4wrx

i will be puting in a skunk 2 im, itr cams, and valve springs in this weekend, so i will need a different ecu right?

hybridreams

You don't have to but what the hell...why not?

HKxBlur

Yes it is, since no custom progs have the secondary control.. (at least the ones widely available to us here)

eg6ajk

you do not need the secondaries, you can chip your P72 with Mugen or even Skunk2 program

C4wrx

so i should just chip my current ecu, or should i pick up a chipped p28?

hybrider

correct me if im wrong

now i currently have 2 ecus, one is a p28 being re progged with the mugen program, thus no 2ndarys and ideal for a single runner IM on the b18c

now if i had chipped the p72 with the mugen program i would still be using the 2ndarys correct? or does this program eliminate the use of the 2ndarys regardless?


[Modified by hybrider93, 2:10 AM 3/3/2002]

hybridreams

Eliminates.
"P72's cam be chipped to run same program as P28."
- http://www.jdmhondaparts.com/ecu_faq.htm


[Modified by hybridreams, 3:35 PM 3/3/2002]

HKxBlur

yah regardless of the ecu, the progs written for the p28 (can be used on p72) will always get rid of the secondaries, since you are overwriting all existing data.. I know of no prog offered that uses the secondaries, I'm assuming since most race setups in Japan are using the b16a/b or b18c5, using the single runner manifold..

JeffS

Am I missing something here??? You've got a b18C1, and a P72 ecu... and you're running the stock intake manifild...

So why are you talking about switching ecu's or chipping anything? Just run what you've got. People are running chipped P28's because (for the most part) they didn't have the P72 to start with and a chipped P28 is cheaper than a P72.

Also, unless you're switching to an aftermarket intake manifold, you do NOT want to disable the secondary runner control.

hybridreams

My god...it's like...he knows me...

EDIT: That is VERY true. You DO NOT want to eliminate the secondary controls on an ECU using a dual butterfly intake manifold.


[Modified by hybridreams, 9:09 PM 3/5/2002]

C4wrx

i have a skunk2 intake manifold, so i am running single, should i still use my stock ecu and get it chipped or pick up a chipped p28? please help with my quesiton, u guys still havnet answered it, thanks, and what program wuold be best, i am running jdm itr cams, springs, retainers, minor port and polish, milled head, skunk2 manifold, i/h/e

hybridreams

Since you already have the setup, I suggest you take it to Skunk2 and bring up the redline/vtec crossover. Or jdmhondaparts.com; their FF.Special.1 is the same ****. No need to get the P28, stick with your P72 and get it chipped.

C4wrx

aright sounds cool, thanks