Jump to content
SAU Community

Recommended Posts

what car what mods what engine???

the mass airflow meter converts the amount of air drawn into the engine into voltage signal . The ECU needs to know int6ake air volume to calculate engine load, this is necessary to determine how much fuel to inject into the cylinder.

this means that when the AFM runs out of scope there is no more fuel injected into the cylinder than there would be at full throttle so when the air flow meter reads full load its supplying the max amount of fuel so if the AFM cant read anymore air coming in it can not suplly the fuel for it to ignight so you basically run out of puff

so what you will feel is nothing just wont make any more power

but if the car is unmoddified you will never reach this point

people if this is incorrect please let me know this is my understanding of the opperation

of the AFM

with the Q45 there is no way with those mods that you are maxing out your AFM get oyur car to a tuner and on the dyno and get your fuel and ignition checked and get them to test the AFM voltage and see if its reading correctly

yeah 5.0 volts is the max, or dead on. if its only a temporary max out its probably ok

but if its maxing out at like 3500 and stays at 5 volts the hole time then its a problem.

if its juts for quick second or two its no big drama. the ecu just wont see any more increase in airflow so more air is coming in than the airflow meter can measure

it doesnt feel like anything really. im maxing mine out, ive just got afm max warning turned off (flashes the engine light). im still on stock rb25 afm

well if you have datalogit why not do a 0 to redline run (on a private road of course) in 3rd or 4th and then look at the datalog report, from there you should be able to see what goes spastic past 5000

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi guys . Can someone help me  I bought an Android screen for my Nissan fuga but it won't turn on   
    • My guesstimate, with no real numbers to back it up, is it won't effect it greatly at all.its not a huge change in position, and I can't see the air flow changing from in turbulence that much based on distance, and what's in front of it. Johnny and Brad may have some more numbers to share from experience though.
    • Which solenoid? Why was it changed? Again, why was this done? ...well, these wear..but ultimately, why was it changed? Did you reset the idle voltage level after fitment? I'm just a tad confused ~ the flash code doesn't allude to these items being faulty, so in my mind the only reason to change these things, would be some drive-ability issue....and if that's the case, what was the problem? Those questions aside, check if the dropping resistor is OK ...should be 11~14 ohms (TCU doesn't throw a flash code for this) ~ also, these TCU designs have full time power (to keep fault code RAM alive), and I think that'll throw a logic code (as opposed to the 10 hardware codes), if that power is missing (or the ram has gone bad in the TCU, which you can check..but that's another story here perhaps).
    • Question for people who "know stuff" I am looking at doing the new intake like the one in the picture (the pictured is designed for the OEM TB and intake plenum), this design has the filter behind the front bar, but, the filter sits where the OEM duct heads into the front bar, and the standard aperture when the OEM ducting is removed allows the filter to pulled back out of the front bar into the engine bay for servicing, a simple blanking plate is used to seal the aperture behind the filter This will require a 45° silicone hose from the TB, like the alloy pipe that is currently there, to another 45° silicone hose to get a straight run to the aperture in the front bar Question: how will it effect the tune if I move the MAF about 100-150mm forward, the red is around where my MAF is currently, and the green would be where it would end up Like this This is the hole the filter goes through  Ends up like this LOL..Cheers    
    • Despite the level up question, actually I do know what that is....it is a pressure sender wire.  So check out around the oil filter for an oil pressure sender, or maybe fuel pressure near the filter or on the engine. Possibly but less likely coolant pressure sensor because they tend to be combined temp/pressure senders if you have one. Could also be brake pressure (in a brake line somewhere pre ABS) but maybe I'm the only one that has that on a skyline.
×
×
  • Create New...