cardana24

iTrader: (81)

I am going to go from stock ECU with SAFCII and FMU to a JWT ecu programed for for boost with 370cc injectors and a Z32 MAF so i would like to make sure I am not missing anything.

Currently my idle fuel pressure is ~24psi. Where should it be with the JWT? I also need to take my FMU out, correct? I am going to take the SAFCII out and plug in the new ecu. Anything else I am missing, assuming I can get the car to idle with the Z32 MAF. Thanks for any help. I know this is not hard stuff but I have not had stock fuel pressure in forever so I forget where I should be setting it. I have an AEM FPR if that makes a difference.

This is on a supercharged 98 5 speed maxima.

kzoosho

iTrader: (16)

lol totally off topic but if you do have to pull your fmu how much do you want for it ANd also my friend may want to by the safcII also. sorry to hijack your thread.

cardana24

iTrader: (81)

I'll PM you once the stuff is off my car. I am not sure of a price and I may sell the SAFCII to my brother, but I will let you know. Right now I need to know what I should do with my fuel pressure.

96sleeper

iTrader: (4)

I would leave the SAFC on the car for now, the JWT tune is not always spot on. Fuel pressure will be stock setting. FMU is not needed.

cardana24

iTrader: (81)

So what is the stock setting? I was going to take the SAFCII off because I have Greddy Emanage ultimate, and I am just doing the JWT thing until I can get the emanage thing straightend out. I am tired of my car not being tuned so I would like to have a run of the mill tune rather than no tune. I have been boosted for 3 or 4 years now and my car has never been tuned.

Also how do I do my fuel set up now? I have an off rail fitting. Should I run a line from the off rail fitting to the AEM FPR, and then take out all of the other additional fuel stuff with the FMU? If some one could please explain this I would appreciate it.

I just got in from wiring my Z32 MAF and i am ready to move forward. I want to get everything running with this set up and my USIM and then I will attempt to put my 00VI back on.

cardana24

iTrader: (81)

anyone want to help me?

DandyMax

iTrader: (7)

Fuel lines should go: filter to front of rail, then out the back to the FPR and back to the tank. Stock pressure is 39/43 (idle/WOT)

cardana24

iTrader: (81)

Thanks for the info. As for the fuel pressure, is this the same pressure I should run even with my 370's? Shouldn't I run a little lower pressure to comensate for the injectors?

The Wizard

iTrader: (43)

Actually, stock fuel pressure at idle is 34 psi.

cardana24

iTrader: (81)

is that What I should be running with the 370's and JWT?

The Wizard

iTrader: (43)

Most definitely.

t6378tp

iTrader: (69)

is that setup for a dek motor, cause mine goes filter, afpr, rail then from the other side of the rail back to the tank

if he removes the afpr and fmu, how do you raise fuel psi in relation to boost, I do not know alot about em or safc but from what I read you can control the fuel base on the rpm so do they also control fuel in relation to boost

DandyMax

iTrader: (7)

Oops sorry I had a brain fart, James is right - stock pressure is 34 at idle.

DandyMax

iTrader: (7)

That doesn't make sense...

Yes the Greddy products replace the function of the FMU.

t6378tp

iTrader: (69)

I was refering to the 4gen and 5gen fuel rails, I noticed in the fsm they were alittle different but maybe I was mistaken and it was for a 5.5 gen


can the safc 2 also takes it's place, do you have a link so I can read up on how it does it .. I am not clear if it raises the fuel psi based on how much boost the car it making

The Wizard

iTrader: (43)

If you're asking if the SAFC-II can take the place of the FMU, then the answer is no. Apples and oranges.

cardana24

iTrader: (81)

I messed around with the car last night. I took my SAFCII out, I replaced the ecu (holy crap its a pain to get the old one out), and only held the new one in with one screw I soldered the Z32 MAF in. I cranked the car and set the fuel pressure. The car is running fine (I have not driven it yet, but it idles steady and it revs smooth) but the warm idle is at ~1100 right now. So I set my fuel pressure to 34 p.s.i. @ 1100 RPM. Will this work for the time being? I really doubt my fuel pressure will fluctuate that much from ~800 RPM to 1100 RPM. I am guessing the high idle is being caused by my tps being out of whack, because I usually run a pathfinder TB, but I switched back to the stock manifold and a TB that was bolted to that along with the TPS and I did not change anything on it and did not check to see if the TPS was set at the right place. I'll probably test that tonight and take it for a test drive later on. Then I will be putting my 00VI on once this set up is running smooth.