rb25det ecu

[nismo240z]

I have an rb25det out of an r33 with a stock nissan ecu. It runs real rich and ive tested o2, water temp sensor, airflow meter, throttle position, etc. and it all checks out ok. Pulled codes from ecu and it says everythings ok. Injectors are stock, and i have an adjustable fuel pressure reg. but car runs rich right down to 18 psi for fuel. I'm begining to think i was sent the wrong computer, maybe for an rb26? I've been searching for a couple hours now and cant seem to find any info on identifying 1 rb computer from another. Anyone know how, or where i could find this info? Any help will be greatly appreciated.

[eh?]

I don't know.. but you could by my apexi power fc

[nismo240z]

I am considering an aftermarket fc, but kinda wanted to get the thing running properly stock b4 moding.

[eh?]

R33 RB25 MT ecu P/N's23710-13u0023710-13u0123710-21u0023710-21u0123710-21u0223710-21u0323710-21u6023710-21u61

[Joe]

how rich are we talking here?

they all run rich.

[nismo240z]

VERY rich, blows a thick dark grey cloud and i have to clear out of my garage after running about a min, and my engine oil smells like straight gasoline. Not good.

[nismo240z]

Thanx for those p/n's eh. A number i saw printed on mine was 23710-72... and the last 3 numbers were scratched off of course. But that doesnt match any of the numbers you've given me, so perhaps ive found my problem.

[Joe]

hmmhave you pulled the plugs and checked color?

what are they gapped at?

[nismo240z]

I did pull the plugs, they were autolites when i got the engine and they were black, sooty and wet with gasoline (i just ran the engine before pulling them). Put in some new NGK iridiums gapped at .030 in. which was a guess on my part. Recently saw some talk about .7 mm gap, which is pretty close to what i gapped them to. I havent pulled the new plugs since installing them.

[Shocker]

check your timing?

[eh?]

post up the full number.

[Bioxide02]

Is there a simple way to see if the ECU is for a series one or a series two? Anyone know?

[Joe]

they dont intermix, so if you have a S1 ecu on a S2 engine/wiring it wouldnt start at all. totally different.

[Bioxide02]

they dont intermix, so if you have a S1 ecu on a S2 engine/wiring it wouldnt start at all. totally different.

Yeah, I know that part.. I was curious if you could tell the difference just by looking at the ecu's?

[eh?]

If it were totally different why is that the aftermarket ecu's will work with either?

[Bioxide02]

they dont intermix, so if you have a S1 ecu on a S2 engine/wiring it wouldnt start at all. totally different.

So, I tried both a series 1 ecu and a series 2 ecu on my S1 rb25det tonight.. And both of the ecu's worked fine.. *shrug*

[nismo240z]

post up the full number.

Can't, the sticker is torn off right at the last 3 numbers, but what i can see doesnt match any numbers you mentioned.

[eh?]

Those are skyline ecu's, the Motor and/or ecu could have came out of another car.

[skyline junky]

actually the S1 ecu will not work on S2 but S2 will work on series1, a quick way to tell them apart is on the side of ecu their is about a 1/8 whole if you look at the whole and their is a adj. knob inside than it is a S1, if its empty and just covered with a piece of clear tape than it is S2. The adj. knob is a build in way to check and see if you are throwing codes. The only difference in the two ecu's is the S2 has build in igniter chip, as opposed two S1 which is located at the back of the of coil cover. Please feel free to correct if I missed spelled something

[eh?]

The only difference in the two ecu's is the S2 has build in igniter chip, as opposed two S1 which is located at the back of the of coil cover. Please feel free to correct if I missed spelled something

That's incorrect. The S2 ignitors are in each plug coil as opposed to being grouped together like the SI.

[matt_calgary]

not to insult you but do you have a fuel pressure gauge for the fuel regulator you bought? I'm assuming you do but figured I'd ask. Who did you buy your engine off of?

My engine runs rich all the time, its a huge ***** in the winter now, I'm getting like 175KM at half a tank without letting it idle forever and staying off the boost whenever possible, RB love the gas

[nismo240z]

Yep, I've tried 2 actually. I use an electronic gauge sensing right off the regulator, and tried a mechanical one to check for accuracy. I've been running the engine around 18 psi which im pretty sure is way low, but if i run it around 34-36 it runs so rich it misfires and within a few minutes fouls the plugs so bad the engine stalls. I think i may have been given an ecu from a rb26dett. Anyone know if that would run my engine at all, or cause this problem?

[eh?]

The closest match leads to a c33 Laurel with a RB20D. Laurel P/N's are 23710-72L60 and L70. You need to get the right ECU or buy my PFC

[nismo240z]

I think your right, i could just make out the top of the 8th digit and it looked like an L but thot i must be wrong. Guess not. I have very little experience with aftermarket PFC's since all my tuning experience is on 240Z's with carbs, but i've been warned that they are expensive to have tuned, and not as forgiving to the the climate changes here in new england as a stock ECU. True or False?

[eh?]

I'm selling the PFC alone for $425 shipped or $500 shipped for a Q45 maf and PFC which be PNP. And it's totally false that a MAF ecu cannot adjust to Climate. A MAF ecu measures the total air density of the air. While a MAP ecu uses pressure and a temp sensor to calculate air density.

[Carl H]

PFC 4 teh w1n!i just got my rb25 pfc + commander in the mail the other day.......now to get the engine rebuilt and back together .

[Spazz]

is your pfc still for sale?does it come with the commander?

[eh?]

No hc.. buy a Datalogit instead.

[zephyro90]

im confused...let get this right...you can use s1 or s2 ECu on s1 motor but not s1 ecu on a s2 motor?

if theres a way or mods can i use the s1 ecu on s2 motor? like use the complete harness of the series1. can seem to find a surplus s2 ecu.

thanks

[zephyro90]

is there a way i can use the series 1 ECU to s2 engine?

i mean maybe i can modify the s1 ecu or use s1 harness. because i already bought the s1 box.

thanks