Phantomkid

Ive got a few quick questions about the stock map sensors ive searched but couldnt find much. The first question is, are map sensor sensitive to ecu ive heard about the n33. all having the same wiring. So i was wondering if thats the only difference i could run the wire myself if the n332 will even read the 318 sensor. Also the n327 ecu for the na does anone know what thats capable of reading up to. I think ive ready something like 5 pounds of boost. Also ive heard about the verts coming turbo in japan so does anyone know if the vert map sensor will read boost, i was once told that the ecu was capable of reading boost, but also told that the us vert ecu(n338) is not capable of reading boost.Thanks for any help guys.

Icemark

The N318 pressure sensor only works with S4 turbo cars.

S4 non turbo cars would use the N326 pressure sensor. The N326/N327 ECUs do not read boost, but rather top out at zero manifold pressure.

All FC's in Japan are turbo, including convertibles. The S4 JDM all use the N318 pressure sensor.

There is arguement on, weither the N338 will read boost. I and several members here have run S4 Turbo motors without any issues at all using a N338.

gerbraldy

I run an n338 ecu/ n318 in my 88' vert with a s4 13bt swap. It runs great, it see's 10psi daily and no problems, 3000miles down the road. It will be getting swapped out though once I get my n332 redone.

HAILERS

N326 and N327 ECU (both n/a) do NOT work with N318 (turbo) boost sensors.

The output of the n/a boost sensors and the turbo boost sensors are radiaclly different. See and read the FSM for both.

I never said the ECU won't see the boost sensor output. It will.

But a n/a sensor will read 3.5 to 4.0vdc at atmospheric pressure. The Turbo will read 2.3 to 2.7 vdc at atmospheric pressure.

Your just going to be feeding inaccurate information to the ECU if you use the wrong sensor on the wrong ECU.

Talking series four.

The boost/pressure sensor is the major input for timing for the ECU.

Phantomkid

i was unsure on the n338 being capable of reading the boost from a n318 sensor. i have a n332 ecu and a n338 ecu. I was originally going to go with rtek thats why i picked up the n332 ecu, but i believe the rtek might be limited to 720cc injectors so ill probably go full standalone like haltech, also because ive heard you can wire it with the n338 harness. Now knowing that the n338 ecu with read from the n318 i might as well leave that ecu in because the harness is still atached. Is there any extra mods needed for the using the n338 ecu and harness im aware of moding the injector wires because of the change in impedence, but is there anything else im missing.

Phantomkid

Also i was wondering what the stock 88 vert map sensor(sorry dont have the numbers mine is totally blank) can read up to. I think the resistance is 4.89 if that helps any.

HAILERS

You can tell whether you have a n/a or turbo sensor by turning the key to ON with the engine OFF. Read the output of pin 2B on the ECU center plug. The reading should fall in the figures I mentioned in a post above , for n/a and Turbo cars.

Or you could unbolt the sensor and turn it at an angle where you can backprobe the brown/red wire with the connector on the sensor and the key to ON, engine off. Same animal.

Maybe I'm wrong, but lets say you had a turbo ECU in a car and had a n/a boost sensor in the car. Now looking at the figures I posted above, at ZERO boost the output of the boost sensor (n./a sensor) would be in the 3.5 to 4.0 vdc range. The last time I looked that voltage is about seven psi plus if it were a turbo car and turbo sensor.

I also think the timing is pulled back when your in boost at those figures. Soooo, here you are driving in a turbo engine car, n/a sensor and your foot is holding the pedal at zero boost but the ECU is seeing the voltage from the boost sensor showing that your boosting at seven plus psi. Is that good/bad/or indifferent??? Got me.

I probably got off track with that.

You might look at the grapb in this url for voltage vs psi and see what I mean: http://www.teamfc3s.org/info/articles/fcd/diy_fcd.htm

Gee. I think tomorrow or someday I'll put my n/a boost sensor on my turbo car and see how the boost gauge reads in the Turbo car. It should read way above the zero on the gauge with the engine off. Never done that before.

HAILERS

Just FYI. I put my n/a boost sensor on my turboii car and engine off, key ON, the boost gauge almost pegs at the top. Just FYI. It makes sense considering the output of the n/a vs the turbo boost sensor mentioned in a post above.

So, what this means to me is: if you put a n/a sensor on at turbo engine car with a turbo ECU, the timing will be corrupt because the boost sensor is already putting out a signal of over 8psi when the boost is ZERO. Timing be fucked up.

Phantomkid

i understand that they use different levels for output readings but what if you used the 88 n338 ecu and the stock american map sensor, im not sure again which sensor it is because mine is blank. But that sensor is made for that ECU and is made for an NA so if the n338 can read the n318 map sensor, how much can it read on its stock na sensor, if anyone know thanks alot guys. Hailers you full of so much good info.thanks.

HAILERS

WEllllllll, I guess I could put a MIttyVac (does pressure and vacuum) on the pressure sensor on my 86 n/a car and watch a meter while I apply pressure to the sensor.

Say I see 3.8vdc on the meter when the pressure sensor is at atmospheric pressure and then I apply 1..2....3.....4....5psi at a time to the pressure sensor. The voltage should go up IF it will respond to any pressure above atmospheric. I might do that for fun in the next few days, but not today. But think about it. If the n/a reads 3.8 at atmospheric pressure, it isn't really going to go much higher. The max you could possibly get is five psi and I have real doubts that will happen. Like I say, in the next few days or so, but not today.

Phantomkid

thanks bro yea im just an *** i didnt really take into consideration at the level it starts at and where it has to finish. maybe if it reads in very small intervals?This is pretty interesting do ecus read at different intervals? and if so how does the n338 do it? Ive heard that ecus run at around 5-6v do they not read in different intervals are they capable of handeling more voltage. Hailer thanks again for all the information.and anyone else who can contribute

Phantomkid

Ok i kinda of understand but know dont understand how the n338 ecu would read the n318 if the na would start at 3.5 or so at zero, unless the n/a map reads atmospheric at 0.because if it starts at 3.5 like you said once you turn it on its gonna think your at about 7lbs boost when your at nothing.....hmmm i should test that but the sensor is 200 miles away. Has anyone tested the na map sensor from a 88 vert?

Phantomkid

just wondering if anyone has tested the vert map sensor. Anyone know what the vert map reads at atmospheric is it around 2.3 or like normal NA 3.5

Phantomkid

So im at my moms and i wanted to test the vert map sensor for its output. But being that the theres not motor in the car i cant just test right from the car. So i was wondering if anyone now what voltage is applied to the map sensor is it 12v or is there a IVR that changes the voltage. If anyone knows please let me know thanks...

HAILERS

You don't need a motor in the car. Just put the battery in the car and turn the key to ON.

Put the meter on the brown/red wire at the boost sensor and read the voltage output.

Then put a vacuum hose on the boost sensor and blow real hard while watching the digital meter reading.

Phantomkid

I tried but it reads 10.6v to the map which im not sure is correct because the battery is low and only carrying 11.44v. So im not sure if how much is suppose to be at the sensor because i dont know if theres a regulator.( i guess i should look at the wiring diagram) stupid Haynes diagrams should be used for toilet paper

88rxn/a

iTrader: (6)

pressure sensor(N/A map) used with a tII ECU will give you fuel cut if you dont have a FCD wont it??????

Phantomkid

You cant use the NA map sensor with the t11(n332, n333) ecus it reads around 7lbs at atmospheric pressure because of the voltage used. Im trying to find out if the vert map sensor is different and that i why the 88vert ecu (n338) can use turbo fuel mapping and yes the t2 ecu has a fuel cut. Fuel cut defenders trick the ecu to read a pressure reading it recognizes , i would go full stand alone i guess if money is an issue you can use a fuel cut defender.

mattdashat04

my injectors arent opening think its the computer so i wanted to get a different one to test i have a n318 maf and a n318 map can i use a n332 ecu???

RotaryEvolution

iTrader: (30)

your year and model of car would be helpful.

satch

iTrader: (1)

One thing you need to check is whether the wires to the injectors are Black/Yellow wire and a Light Green wire on a particular injector or are they a Brown wire and a Light Green wire.

Also w/key to on check the voltage on the Brown/White wire at the Boost Sensor for 5 volts. If it reads 0 volts then there is a short which needs to be addressed.

mattdashat04

88 turbo 2

mattdashat04

i unplugged the injectors and wired them straight to the battery and they opened no problem
thats y i was thinkin it was the computer

satch

iTrader: (1)

Why not do as post #21 offers? Takes but a minute to do.

mattdashat04

black wire no voltage white wire no voltage blue wire 5 volts and red almost 12 volts