let me introduce myself (first post) with a rich running rb

[biohazardmotorsports]

Hello everyone my name is matt and i live in helena montana, far away from most of you and RB engines for that matter. seriously i only know of three in the state.
anyway
i am working on my 89 240 hatch with a rb20det swap, and its running rich like a water faucet. I traded a 90 eagle talon awd for this car acouple months ago and when i first got the car it had terrible running problems caused from poor battery connections. fixed that and the car ran great. the engine has adjustable timing gears. and arp studs throughout the engine, which leads me to believe that the engine may be built, oh he also said that the turbo was a new garrett gt28r (he lied). i was playing with boost one day on the interstate and watching the wideband to see how far it would go. (yes kind of dangerous i know) i turned the boost controller up to about 16-18 psi just for a sec and POP! goes the turbo! ceramic blades out the exhaust. i drove the car for a couple weeks acouple miles a day between work school and home and when driving it ran fine just no boost. acouple days before i put the new turbo kit on the engine began to run worse and worse, i thought it could be from the ecm being mapped for a turbo and now there wasnt one, so i wasnt very concerned thought it would be better when i put the new turbo on. when the gt35 top mount set up got here i put it on and double checked everything and started the car. it ran pig rich! bad constant 10 or blinking 10 on the wideband so i thought ok boost leak boost leak tested found acouple small ones fixed those helped alittle bit but still wont idle and very rich. i have the maf as a blow through set up, its a z32 maf and there isnt a o2 sensor which kinda tells me the guy had the computer tuned but there isnt anything on the ecm telling me about it. there isnt any codes flashing either. ive cleaned the maf didnt help, played with timing didnt help, replaced the coolant temp sensor didnt help either.

You guys have any other ideas why it wont even idle please help me out im lost.
thanks in advance Matt

oh im going to get on the ecu connector now and check power grounds and see if there is any voltages on the signal wire for the o2 sensor.

[Yellow4g63]

Did it already have the Z32 maf? or you added it? He prob did not wire up the check engine light to the dash harness so prob why you don't have a light coming on. Look at the ecu it has a light that will flash the codes. If your looking for engine management look up Nistune daughter boards. It's a real time tuning and monitoring of your sensors. You need the software or if there is a nistune dealer local they will have the software so all you need is the board.

[Carl H]

proly in r&r mode if its got a zmaf and no tune to compensate for it...running hella lean!

[biohazardmotorsports]

The z32 was on there already and I did check on the ecu and it flashed 55 for no problem. I have been looking at the nistune systems and I took my ecu out and opened it up. There isn't a mother board or any port to connect a cable for a computer.
And what is r&r mode? And it's running rich I know that for sure the wideband is pegged rich I've used a half tank of gas in 20 miles and I can definatly smell gas when it's running.

[Yellow4g63]

hmm what about the chip? it could have a reprogrammed rom on it.

[Yellow4g63]

reason I say that is it prob wouldn't even idle or run right with the Z32 maf installed.

[biohazardmotorsports]

Yeah I knew that it would have to have a tune on it to run properly with the z32 maf. that was my next question if you could do that but why wouldn't they put something on the ecu to say that. Is there anyway to tell if the rom has been tuned?

[Yellow4g63]

if you have a motes burner you could take the chip off the board and read it, or download the rom thought nissan datascan and open it up with rom editor. I forgot the other free program carl uses.

[biohazardmotorsports]

I wish I had those kind of tools to work on hardware and flash roms and proms and whatnot. So I guess I'm gonna try some sort of piggyback fuel controller. You guys have any suggestions for them? Coming from a Dsm back round about 80% will say not to waste your money with piggy backs and go with a dsmlink. But from what I've researched Nissan seems to take well to afc and super afc's etc.... What works, what doesn't from your experience

[Yellow4g63]

AFC worked better on my 1G dsm that it did on my friends nissan back in the day. You could use it but it won't help with the ignition timing. I have noticed that nissan's aren't as sensitive to it as DSM's. Where the DSM would pull timing to save the motor when it see's knock the Nissan will knock pull a little and keep going till you killed a ring lol. The moats burner was like $100 when i bought one 5 years ago shouldn't be too much. The rom editor software is free 99, not sure which chips you use but google could find that for you. only problem is you won't have any realtime tuning to maptrace with unless you buy the nissan datascan then you can maptrace your stock rom see where it needs to be changed, pop the top burn a new rom with the changes. Doing it got my nerves back in the day lol. I don't know if Carl still does the rom tuning but you can ask him if you don't feel like getting the equipment and learning yourself.

[biohazardmotorsports]

Yeah that would be a huge pain to flash then drive around the block pull it out then load it change and repeat that for acouple hours. Well I'll keep ye posted if I can find any answers to what is happening with my car good or bad. I think if I can find a good deal on a afc or super afc then I'll do it other wise I may just go nistune and control it all.

[biohazardmotorsports]

Ok update I have been driving the car the past week and the car is now beginning to trim fuel. I haven't touched anything I had only checked sensors but didn't adjust anything. And slowly the fuel trims started to go around 14.5 14.7! Perfect I was wondering if it took the car that long to rewrite the cells in th fuel maps and timing maps? That make sense to anyone else, or am I talking to the wind.

[Carl H]

the ecu is self learning but can only trim so much fuel...14.7ish sounds like map target for a stock ecu under light load/cruise.