Ka24det project

[lexcrob]

Many people have used vortech FMU's without problems. Or course its not "ideal and you are going to be limited to around 7 psi of boost pending you base fuel pressure and ratio 8:1 7:1 6:1 and you'll want to be on the rich side.

Make shur you put in a walbro255 when going this route and make shur wiring to pump in good shape.



*caution* : fuel injection fuel line is only rated for around 100psi so thats kinda the "Safe" limit

(make shur lines not 30 years old replace if any doubt



FMU really gets a bad wrap for no reason but dumb people not knowing the obvious limitations turning up the boost and wonder why their motor blows up.....Then forums spread the cancer around saying they are just crazy blahh blahh.
All an fmu is really is a fuel pressure regulator race cars and most tuner big time cars use fuel pressure to dial in a tune. Even using 2:1 fuel pressure regulators which.....are FMU's LOL



Good luck you got a long road!

[nissan240boy]

well i already have this setup and from what ive read my a/f ratio is pretty good so the ecu is doing its job, i havent seen it go any leaner than 13.1 at wot and the 12.1 i previously said was a skip.

anyhow im confused with my car right now, i set timing to 20 and my ide is screwed up on my car so i had a friend keep on the throttle enough for it to idle and unplugged the tps, so i took it for a drive at stock timing and as soon as i would give it a little gas it would like have no power and felt like it was missing im assuming it was detonation and my egrs went to 1400 super quick and i let off the throttle. so i adjusted the distributer about as far advanced as it will adjust and now it runs great and boosts pretty quick and i spun the tires through 1st and 2nd and egts didnt go above 1100, and even in 3rd gear boostin for 5 seconds it slowly rises to 1300 but seems like it doesnt wanna go much higher, so it would seem im close to having it running good but y does my timing need to be so advanced for my car to run good? and what else can i do to get the egts a little lower under wot. also idk if this matters but i have a decent leak at the turbo to manifold, i have a new graphite gasket ordered because i installed a new metal gasket and its leaking so i have major turbo lag, it takes like 2 or 3 seconds till i boost 7 lbs

[compactfean]

Your afr is not good for a turbo engine..... You should be at 11.2 -11.5 at wot. That's why I recommended looking in to your fuel pressure.

[nissan240boy]

so does this mean im running rich? Y does it detonate so bad when timing is set to base timing? I thought lean causes heat and detonation and rich causes cooler egts, anyhow if I use an aftermarket adjustable fuel regulater and remove the stock one will I be able to solve the fuel ratio problem? And wat should the stock fuel pressure be?

[moso]

he is saying you need to run richer 13.1 is rich from 14.7 which is stoichiometric (15.1 would be lean) he is saying you need to be richer!! more fuel, less knocking, lower egts, and overall a happier healthier motor. you should have upgraded both the fuel pump and fuel pressure regulator. you will need to get a walbro 255 (dont cheap out) and a adjustable fpr. for a fpr i got a Toemi it was the cheapest good fpr i could find. I got mine on eghay for 100 bucks ( the cheap ones arnt real... just look at the O in Toemi!!) fuel pressure should be 34 at idle vac and 42 with no vacuum.

[nissan240boy]

Okay thanks bro so the lower the numbet means richer and higher means leaner correct? And ok ill buy a walbaro and a tomei fpr, is an aem fpr good too? Ok so I should put my timing back to 20 and y wont my darn car idle, it shuts off if I let off the gas pedal

[compactfean]

Sounds like your iacv is clogged. Take it off and clean it with carb clean. You can also try adjusting the idle screw out. Also what is your tps voltage at? Make sure your throttle plate is completely closed and set the tps anywhere between .35 and .45 volts.

[nissan240boy]

How do u adjust the tps and check voltage, detailed instructions please

[compactfean]

Search and you shall find. the-final-idle-thread-t536493.html

[nissan240boy]

Ok I read that thread, heres my questions?
where do u check voltage at for tps
do u use a multimeter
wats a cts sensor
y do they say to adjust timing to 15 btdc, I thought it was 20 after tdc or am I lost lol just explain it to me
also theres like 5 marks so which mark do I want, the one before the last on the right
and do I set timing or tps and iacv first
no garages around here use obd1 anymore so how can I check the ecu for codes
and last question on the fpr tomei do I want type s or type l

Thanks for helping give me lots of info

[moso]

you check the tps voltage by backprobing the connector, search for tps adjustment. yes you use a multimeter, google how to use one. the cts sensor is Coolant Temprature Sensor. should set your timing to between 15 and 20 depending on how your car reacts ( run as much timing as you can without detonation) the marks are 5 deg incraments beginning at -5,0,5,10,15,20. set the tps first then set tps, then idle, then timing, then idle, then timing (rinse repeat as nessicarry until they stop affecting each other) check the FSM ( factory service manual) on how to read the ecu codes from your ecu. I use a type s and you should too, type s means small diaphram type l is large ( large is for high hp high fuel demands)

[nissan240boy]

Ok bro sounds good I got the pump ordered, a glowshift fuel pressure gauge and the tomei fpr, itll prolly be a week till I even have time to mess with my car

[nissan240boy]

Yea im running way lean 16.5 at idle and 15.5 cruising, so when I put on the regulator what fuel ratio should I be at for idle, cruising and wot, and where should my egts be for idle, cruising, and wot

[compactfean]

14.7 ish would be ideal for idle and cruising

[nissan240boy]

ok thanks, i got most of this figured out, now once i get all this installed and my afr and egts are at a normal range, is a tune nessessary for 8 lbs of boost and the enthalpy ecu i have is it tuneable at a dyno tune shop? the closest shop around wants 400 bucks to tune any tuneable ecu which sounds crazy to me so will my car be reliable and good to go if afr and egts are good?

[compactfean]

Your car should be fine. Not only is your ecu not tunable, it doesn't need to be tuned. You most likely have an issue that you haven't fixed, and that's why your car is running lean high egts etc. most of the time, those base tunes are meant to go way past 8psi but you are definately going about this the correct way now. After you figure out your lean condition, get a consult and monitor your injector duty cycle. You don't to take those injectors past 85-87%. While doing this, also monitor your afr. you keep saying you have an enthalpy tune, but mention e-mance. Two different companies bro. If it is a e-mance ecu, than once you work out the bugs, GET THE CAR DYNOD! This is a mistake I made on my first set if chips and was not very happy with e-mance, when all I had to do was get the car dynod, send the dyno sheet to him, and he sent me a new set if chips.

[nissan240boy]

Explain more bout the injector thing, and I went on emances website and it directed me to an ebay section,of there ecus and there all called enthalpy ecus ill post the link then, I only paid 265 for it, so wat is it emance or enthalpy?

[nissan240boy]

Ok just did some research the company I bought it,from is emance and the title on the item says enthalpy and I looked and its an emance ecu I believe, so is this ecu tuneable and does it need to be tubed if im only running 8 psi

[compactfean]

No tune. Its set up for what your told him. If you got it off ebay, its e-mance.

[nissan240boy]

Ok so yd u say bout getting it dynod right away if its emance?

[compactfean]

I'm saying with any set up, get it dynod. E-prom tunes will always need refining. especially when you start turning things up. remember that they are just base tunes. When I did my first chips I didn't know to do that right away.

[nissan240boy]

ok so when u say get it dynod, is that just a dyno pull or does that shop do a tune, I guess wat im sayin is am I safe on 7 psi cause im happy with 7psi right now, it drifts awesome on 7psi

[compactfean]

Once you get the fuel system dialed in to where you want it, then get it dynod and get the exact afr at whatever rpm and any knock info to jason to fine tune it.

[nissan240boy]

Ok thanks, and then he will send me a new tuned chip to install in my ecu correct?

[compactfean]

Yes, look at the fine print in his warranty info. Its all in there.

[nissan240boy]

Ok im really confused here, got fpr installed and set to 37 psi at rough idle, but still getting funny readings on afr and egt, my afr at idle and cruising will sit around 14.5 but then jumps all over the place and goes lean, I set base timing and was gettin hot egts just tryin to go up a small hill. So I set the timing pretty far advanced again and egts get cooler and pinging goes away but egts still reach 1300 after a couple seconds of boost, one thing I notice when I put the pedal to the floor it seems like it doesnt pull all for 2 or 3 seconds then bam it takes off, its almost like when I first initially start to make boost it falls on its face, could an oxygen sensor cause these problems?

[compactfean]

Most likely not o2 sensor. However, have you checked for codes? Also did you have the injectors flow tested? I find that a lot of old sr injectors get clogged due to age and lack of service... (real service, not those gas tank additives) what are you setting your base timing to? It should be at 20° btdc. Also did you set your fuel pressure with or without a vacuum source? It should be at 43.5 w/out vacuum at idle. Also have you boost leak tested the system yet? Does spraying carb clean in to the intake make your idle smoother?

[nissan240boy]

How do u check codes, I have a consult cable ordered and, did not test injectors but did turn the enine over with the rail out the intake and they all spray good by visual looking, idk where timing is at I turned the distributer as far clockwise as it would go and car runs better, when I set it to the last mark on the right it pings and has missing problem and egts go way hot, ok ill trecheck fuel pressure now and let u know where it was, ill spray carb cleaner in but where at the turbo?

[nissan240boy]

How do u check codes, I have a consult cable ordered and, did not test injectors but did turn the enine over with the rail out the intake and they all spray good by visual looking, idk where timing is at I turned the distributer as far clockwise as it would go and car runs better, when I set it to the last mark on the right it pings and has missing problem and egts go way hot, ok ill trecheck fuel pressure now and let u know where it was, ill spray carb cleaner in but where at the turbo?

[nissan240boy]

Okay heres wat ive cone up with fuel pressure is 43 psi at ann idle with vacuum line disconnected, so,fuel pressure is good, now it seems to run 14.5 sometimes at idle but jumps back and forth, anyhow I gave it like half throttle pullin a hill and had a steady 13.5 on the afr and I think it was one or 2 psi of boost, so could the problem be that when boost goes abd higher than this I lean out cause my stock fuel pump cant keep up the pressure? Im installing the walbro 255 fuel pump tomorrow and well see if it makes a difference, how comr my egtd get som much hotter when I set my timing correctly as opossed to now running advanced