Installed them this past monday..my fuel setup is:
walbro 255 fuel pump, cartech fmu, 370cc injectors, stock fpr, mechanical fuel pressure gauge.NISMO fpr coming in monday..

First started the car and the rpms jump to 2000 rpms, then settled around 800 rpms at idle...Looked at the fuel pressure gauge and it read 61 psi....then i just shut off the car..read up on how to tune with safc and cartech fmu..came back out an hour later and car took forever too start..is that because the injectors were dumping alot of fuel at startup???car idled fine around 800 rpms..the center screw on the cartech adjust the fuel pressure right before boost, when I turned it counter clockwise, the fuel pressure went down to 43, if turned clockwise, fuel pressure raises. So I left it at 43 psi..Then I turned the bleeder valve counter clockwise so that i get the minimum rise rate versus boost pressure..I did this because with the larger injectors, I dont need a maximum rise rate versus boost.
so..car is still idling around 800 rpms..I tuned with the safc, and set low throttle at 23%..my rpms start from 2500 to 7000..how can i change it so i can go as low as 1000 rpms??
Anyway, At 2500 rpms, I setted it to -25% then 3000, 15% and so forth..and my high throttle is set at 50%..And I just evened it out throughout the rpm band...At the lower rpms, its set to -10%, then increasing after that to the higer rpms..So car is idling fine..I take it out for a drive, and it runs not so well..I mean it drives but it bogs like the car aint going no where..like the car is choking when im driving normal..So i try to boost like 2psi, and the car just doesnt go anywhere, is that because when i boost, the injectors are dumping too much fuel, and causing my car to richen up..???

I think I might just take the fmu once i get my fpr...
once i get the fpr in, and turn down the base fuel pressure to 40psi..would i be ok..
Going to take it to dyno soon, but I just want to get it running right with no problems before taking it to get it tuned..

let me know what your suggestions are....

 

without an adjustable fpr, you are going to dump in a lot of fuel in the car. base idle with the walbro and 300zx injectors should be ~26 psi, not 40.

if you can, try to use the z32 maf and the a32 ecu. i think bags is running this setup without an fmu.

bags, if you see this i have a ?

What base fp are you set at with the z32 maf and do you need the fmu at all? What would happen if you used a 1:1 disk?

 

first of all this guy has a 93 which is a 3rd gen not a 4th gen so the ecu doesnt matter

he could use the z32 maf and eliminate the FMU and run stock FP but he would still need to tune the car with the safc WITH A WIDEBAND

your definitly running rich and you proboly wount be able to pull enough fuel with the safc so just wait untill you get the adjustable FPR

and the cartech FMU does not use disks it has an adjustment screw to control the rising rate besides the stock FPR is 1:1 so it wouldnt do any good

 

i know that the cartech doesnt have disks, but it still has a rising rate. that was just for me.

sorry about the mixup for the 3rd gen thing, i forgot to look at that.

i totally agree on the wideband and the tuning.

 

Ok.. you took my topic for the day.. you happy now?

I was going to come on here and tell my story but you beat me to it.
ANYWAY I put in my 370's today with stock ECU and programming.
Was not quite sure what would happen but I was going to do it anyway.
I'd been running 60-65psi at IDLE to get the fuel the engine needed and it still was not enough. So I figured that if I put in the 370's that I could drop the fuel pressure to 30 or so and make the same fuel Right? WRONG...

Ok.. I start it up and it's running weird. All the rear cyl are not working.. I track it down to dirty connection problems.. fixed that for now but I need some good elect. cleaner for tomorrow. I started with 30psi and it was tooo much with a small throttle crack. Down down down I went all the way to 17psi at idle. That's where I'm at today went from over 60 to 17 at idle.
So.. I'd suggest a Aeromotive FPR. That's what I'm running. I can't controll the injectors yet but I'm going to work on that.
Good luck... Scott~

 

I am at APPROX 40 PSI @ idle.. with the walbro 255 fuel pump. I used a mechanical gauge to veryify this. It read right around 40 psi. I have the STOCK FPR.

The start up/cold start is not changed when you use the Z32 maf. With the Z32 maf @ ~700 rpm I see almost the exact same voltage as the A32 maf @ ~700 rpm.

For MY application, 8+ psi, I found that I needed an FMU. I did not want to add more than 5% fuel. Using NO FMU, I was adding 10% or more so I stopped and came back with an FMU.

I am using the 4:1 disk and I was at 10.x:1 around 3500 rpm and it leaned out to 12.x:1 at redline

1:1 disk would not cut it with my 400cc injectors. Maybe with 500+cc injectors the stock 1:1 FPR would work, but you would have to lower the base FP.

 

Sorry if I repost anything anyone else said.... At 61 PSI of FP your lucky the car statred again without you taking out all the spark plugs and drying each clyinder.

Yes it did not start due to being flooded.

You SHOULD lower your base FP. I'd try 35 psi.

You need to lower the 7000 rpm number and work your way down. Lower 7000 to as low as the SAFC will let you and repeat this all the way down. Do you not think the ECU can handle the injectors below 2500 rpm? I know nothing about 3rd gen ecu's.

How in the blue heck did you adjust the numbers on the SAFC without a WB02? Your asking for a blown motor if you did this. Unless you used a WB02 and forgot to mention it, how did you know if you were rich or lean?

 

I'm scared to put on my wideband to see where I'm at now.. Yikes. If you were running 400cc's and getting lean I wonder what my 180's were doing! Hopefully I can get the 370's dialed in for what I have. Your engine flows more air than mine I bet.
Good info!
Thanks
Scott

 

I was being dramatic... Just go dyno tune or buy your own WB02 and "street tune"

Seriously, I would not boost ANYTHING until you get a WB02 hooked up

 

Bags,

It is impossible for your Z32 MAF to not have made a difference during cold starts/idle.

The Z32 MAF will shorten pulse width.

 

Voltage @ ~700 rpm was either the same or .1v difference. I also thought cold start was a preprogrammed thing that did not use any sensor for settings.

 

And I may toss the A32 maf back on there and see what happens..lol

 

Cold start still uses the MAF, but no 02 feedback.

Probably the same fuel/timing maps as open-loop, but with additional cold start enrichment/pulse width.

Once warm, it goes closed loop and falls down to 700rpm. At that point, it doesn't matter if you have a Z32 MAF or reasonably bigger injectors, since it uses 02-feedback to target stoichometric.

Once warm and 30-40% TPS to WOT, you enter the open loop maps again, but without cold start enrichment.

 

You should toss in the A32 MAF for a test, but it would be best if we could monitor injector duty cycle.

I know my multimeter can do pulse width, but I've read that it doesn't work too well and that an oscilloscope would be best. I keep saying I'm going to borrow one from work and verify, but haven't yet.

 

Thanks for breaking it down barney style...

 

Yeah I don't have anything that can verify IDC.

 

That's not Barney style...that's just all the brain I had left after a **** day at work.

 

Yo.. Ice.. that the same for me too on my 89? when you go WOT it's in open loop? What would happen if I put in a Z32maf? Live edit still won't work with my INI file or Bin files.. Basicly tuning with Fuel pressure! I hate doin that. Do have a wideband but need to install it next week.
Live Edit's my solution but need it to work. I'm half temped to put my damn F.A.S.T. sytstem on it for the winter! At least I could tune the damn thing!
Ahhhhhhhh
Ok.. just venteing..
Scott~

 

yes your car will go open loop when you go WOT, im pretty sure every fuel injected car is like this

yes you could use the z32 maf with the 370cc injectors but you would still need to tune the A/R slightly althought its pretty close.

you could also hack your stock maf using a bigger pipe and it would do the same thing but i dont know what size pipe you would need to use. you would need to google this meathod there is lots of info out there about this

 

scott is 3rd gen, isnt that a z31?

 

a z31 is a 85-89 300zx

a z32 is a 90-96 300zx

a j30 is a 89-94 3rd gen max

 

Ok... So I've got the 370's in now and fuel pressure is dropped down as low as the Aeromotive FPR can go.. 16lbs at idle. Now here's the weird thing. Idle is nice up to 2-2500rpm is nice with light throttle. Drive like a "normal" person it's fine. If your say 50%throttle it loads up (rich) prity bad. Floor it .. it clears out and pulls great. I've gota hook up the wideband for the WOT pulls but it's better than the 180's that were getting hit with almost 100psi of pressure.
I'm not going to give up on using a romulator and live edit but I need somthing to controll the injectors for now. What's avalible for that .. I've heard mention of Somthing like e-manage or whatever.. What's the cost in that and what all can you do with it? Maby I won't need to change anything in the program just controll the injectors. Any comments?
Thanks, Scott!

 

with emanage, you will put your fpr at base fuel pressure and you will program in what your original injectors were. then you put in the size of the new injectors. that should work out your problems. you can find an emanage for around 275 on ebay and its as easy as wiring in an afc. the support tool costs a little as well, but you can sync it with your laptop.

good luck
steve

 

Just installed the fpr..I have the cartech fmu...whats weird is that when I adjust the fpr to base fuel pressure of 32psi, and then when i adjust the center screw on the cartech fmu, my fuel pressure changes..clockwise(raises fuel pressure) and counter(lowers fuel pressure)..how the heck am I supposed to know what base fuel pressure Im at when the fpr adjusted it and the fmu adjusted it too..I know I'm dumping alot of fuel because fuel is coming out of my exhaust.(literally)..
Would my problems be fixed if I just removed the cartech fmu??? and just run with the 370cc injectors, nismo fpr and safc??

On my safc, i adjusted -35% at 2500 but its still running rich...
I thought the fpr was going to fix the amount of fuel being dumped into the engine..??

let me know..
thanks

 

Sounds like you have made this overly complicated.

Without a Z32 MAF, wouldn't you be able to get away with a ~ .7 MAF multiplier, and run the stock FPR.

With a Z32 MAF you could run stock FPR and kill the FMU as well.
(depending what power you are looking for)

Once you have the basics done , where it will run, it would be a good idea to use a wideband and get everything in line. Keep in mind extreme richness will kill a sensor with a quickness.

 

So just by installing a Z32 maf it'll lean my car out a bit? If that's the case I'll take two!!!!! Where could I get ahold of a Z32 maf? Parts store or someone here got'm? I thought I rememberd a thread about wiring differences? What's the scoop there?
Thanks
Scott

 

I got mine (z32 maf) on Car-parts.com for 70 bux. It's for a 93 J30.

 

only 4th gens have to change wiring, its plug and play on your car

and car-part.com or ebay have them

 

So eather the J30 or the Z32 will work. Great.
What will it actualy change? You had mentiond that it will read more air than a stock max MAF but will it make it run leaner than the stock MAF with doing nothing but plugging it in??????? That's my main question.
Thanks! Scott

 

yes. your stock was 170, right?

it should have the same proportions to your ecu.

for the a32 with 370's, it reads close to where the stock pulse width is

 

so guys, what would the solution be to my problem??a z32 maf??
370cc injectors, walbro pump, cartech fmu, nismo fpr, stock ecu, stock maf and safc...

How would i be able to tune the car to get it not to run ridicously rich(hence, fuel coming out of exhaust).

why is that when others installed 370cc injectors, their cars ran fine...

 

how many times do we have to repost the same info. yes you can install a z32 maf with 370cc injectors, elminate the FMU and your A/F ratio will be pretty darn close but you will run alittle lean on the top end without an afc to tune it

have you tryed lowering base fp to the low 20's that should alow your car to run right

 

After a hour having Bernarrd talk me through all the proper steps with Live Edit and the tuning that came with the Pocket Romulator I've got it installed correctly and a base program to compensate for the 370's I installed. I'm getting 11.5-7 at WOT below 4500 and 10.2 above.. I shift around 5000-5500rpm. Cruzing a/f is good but idle is around 17-1afr. Proably gota move some cells there to help out. But it WORKS!!!!!!
Thanks again to everyone who helps get this stuff right.. I'm super pumped.. I also threw in a extra turn on the wastegate before leaving the shop. I'm at 27F$#@psi.. Oh no.. That's someone else.. Seriously I was at 7 now I'm at 9psi..
I think that dude drank too much turn signal fluid!
Thanks again, Scott~!

 

sounds good. just keep playing with it

you dont know what your maf voltage is at redline with full boost by chance

 

great scott. congratulations!

 

Nope.. not sure on the MAF voltage is.. I'd have to put the voltmeter in and check it out. I'm trying to get ahold of the Z32maf.. that's my next venue. I made a cool little bracket for the Innovative Motorsports Wideband that mounts it on the center console on the right hand side (kinda by the shifter) If anyone wants one I can build it again for about 15.00 +s&H. painted and all. I'll send Mark C a pick to put up..
I would not have goten this far with out Bernard's help. We talked again today and claified a few things.. It's never run better and there's only good things to come from here on..!!!!
~Scott
Once I get this down I'll order the pocket programer and make chips for you guys with 3gens.. Killing JWT's my goal.. 500.00