Is this an rb25det series 2 ECU???

[craz4240]

No idea here guys I have searched alot....maybe in the wrong places but who knows..can anyone answer me if it is in fact a series 2 ecu??

[craz4240]

Noone know???

Cars running super rich....wanted to make sure 100% this ecu is correct.

[d356bud]

do u have a walbro with a stock fpr?

[s13point5]

do u have a walbro with a stock fpr?

i was gonna say that. having a upgraded fuel pump and a stock FPR will make you run super rich and horrible gas mileage. car should run better if you have a upgraded fuel pump with a adjustable FPR (nismo)

[craz4240]

Have a walbro 255lph fuel pump,Aeromotive FPR set to 43 psi with vac off,Throttle switch is set,Coolant temp sensor is active to FSM specs,haven't checked o2 sensor yet,and don't have a schematic for the 3 pin Series 2 MAFS plug so I can check that...all I know it the car "seems" to run better with it plugged in.

It's idling with black smoke,and won't cruise at all after about 10 mins it just floods itself out.Assuming the injectors are stock as they are purple top sidefeeds.

Also has Apexi AVC-R installed and sensors setup,never setup gear selection yet as the car doesn't really run good enough to do so,so I set the settings to "OFF".

One thing that is not done but needs to be done is the stock fpr blocked off,for now I have the vacum line going to the Aeromotive and the stock fprs vac outlet blocked off.

Doesn't seem to have any boost leaks...however that is left unchecked as of now with a boost leak tester that is.

One knock sensor connector was damaged when the motor arrived...so I popped the terminal out of the plug,re-crimped the terminal to the wire and re-installed it the best I could>dunno if a bad front knock sensor would cause rich and retard to this extent or not.

[s13point5]

wait. you still have the stock FPR on the rail? pics of your setup.

[craz4240]

Not my car but a friends I am trying to remedy for him.

Pics of regulator setup



My rb20 ran rich but ok the same way this is setup for awile.

[silviasgp06]

hmm, looks like the stock regulator is still hooked up and functional. the old reg needs to be removed in and replaced by an after market regulator adapter such as http://www.projectnissan.com/s...=4249 and after that is correctly installed with the fpr hooked up correctly then set the fuel pressure

[s13point5]

hmm, looks like the stock regulator is still hooked up and functional. the old reg needs to be removed in and replaced by an after market regulator adapter such as http://www.projectnissan.com/s...=4249 and after that is correctly installed with the fpr hooked up correctly then set the fuel pressure

EXACTLY what i was thinking

[lilskyline240]

yeah without removing your stock FPR all your Aeromotive FPR is doin is keeping 43psi of fuel pressure between the stock FPR and the Aeromotive one. Your fuel rail is prolly over 50psi if your stock FPR is shot with that walbro pushin a ton of fuel in there

[craz4240]

I agree with what you guys are saying 100% and that is a piece thats on the way.However the rich issue is above and beyond that issue.

My rb20 ran walbo straight to stock fpr for a lil while when I first got it,and I have to say it did reek of gas,but ran ALOT leaner then this.

May have a couple stuck injectors.

[lilskyline240]

you might actually be increasing the pressure in your rail more than you know with that aeromotive FPR. It might be forcing more fuel back into your rail past your FPR. Disconnect the Aeromotive FPR and see if the problem gets better. Ill bet it does. cuz right now your pretty much just plugging the return line...So All the fuel from your fuel pump HAS to go into your motor

[craz4240]

First time it flooded out it was running just stock fpr.

My rb20 ran better with things setup like this while I waited for my adapter.

I appreciate the help......but this is not the issue.

[S12_hybrid]

Kendal, it's Dan.

I have a very similar issue, it is very hard on start ups and seems to sputter/die out until warm.

One question to ask yourself here is : Does he have a 3 pin maf? I believe I have a very similar over-fueling issue.

-Dan

[craz4240]

Kendal, it's Dan.

I have a very similar issue, it is very hard on start ups and seems to sputter/die out until warm.

One question to ask yourself here is : Does he have a 3 pin maf? I believe I have a very similar over-fueling issue.

-Dan

This is similar but a little different......the longer the car runs the worse the overfueling is....basically IMO due to either larger then stock injectors with no tune,wrong ecu,or stuck injectors once the fuel accumulates in at least 2 of the cylinders the car dies and won't start back up unless I clear the cylinders then re-try.It is a series 2 it does have a 3 pin maf and it does appear to work correctly.

[craz4240]

Anyone agreee/disagree with this diagnosis....not able to tst till this week comming just want to gauge.