ECU remapping

Boost leak is a high probability as per usual. When is it overfueling?

I can get any parts for you, as for fitting them I don't know anyone in jhb but I'm in cape town if you want to take a week holiday trip down south
😉

HAHAH i would need about R5000 jst for the petrol to get down there. Dont you wanna come set up shop here in jhb, you'd make a lot jst from my car alone.

and what is a boost leak and how does it affect petrol consumption?

haha, a boost leak is when air is escaping from your pipes somewhere, in effect the afm is measuring a certain amount of air but the engine is actually getting less air than measured and therefore overfueling.

:x this is such a headache!!!!!!

Just take your time and work through it one step at a time, its worth it when its right.

How do you know it is overfueling?

well everytime i get on the boost the petrol needle slowly heads south, irrespective of how long i'm on the boost for. Basically everytime the bov goes off the petrol needle goes down. And wen i switch the car off i hear what sounds like bubbles in the fuel tank, like the fuel is going back from the engine into the tank which is what leads me to believe that maybe the fuel pump is faulty

And the second reason is that i know for a fact that a 1.8 four cylinder engine with a t28 turbo boosting very low cannot possibly consume as much fuel as mine does. I mean the car is basically stock. T28 turbo, bov, fmic, free flow exhaust and slightly bigger pipes are all the engine upgrades that have been made to the engine so it maketh no sense why it drinks fuel like a Veyron

If the fuel pump was faulty you wouldnt get enough fuel.

Have you measured how much fuel it uses? ie. how many litres/per 100km's?

Dumani wrote:

well everytime i get on the boost the petrol needle slowly heads south, irrespective of how long i'm on the boost for. Basically everytime the bov goes off the petrol needle goes down. And wen i switch the car off i hear what sounds like bubbles in the fuel tank, like the fuel is going back from the engine into the tank which is what leads me to believe that maybe the fuel pump is faulty

you have not yet experience a car that the needle moves faster then the minute hand in the clock...

have not measured the consumption yet. didnt think there was a need to cause it will just cofirm what i already know

But sometimes guys can expect good mileage form a turbo charged car, which isnt going to happen.

Not that I'm saying you are wrong, it will just confirm that it is doing way too much before we bang our heads against the wall to find the problem

"Bang our heads" LMAO!!! I've found an Auto-Mate service station thats willing to run a diagnositic test on my ecu for a fraction of the price Nissan were asking for so I'm hoping the problem shows up on there.

Cool, hopefully something shows up

And now the latest developement in the problems department is the same issue that Buckusa was having with his S14 not idling properly. Mine has not gotten to the point where it just switches off but I'm afraid its getting there. :'(

The most basic things to check are:
Split or perished pipes
Clean air flow meter

it'd seem the AFM is the source of MANY a problem. Would it be possible to chuck it out and replace it with a fuel management system??

Dumani wrote:

it'd seem the AFM is the source of MANY a problem. Would it be possible to chuck it out and replace it with a fuel management system??

the AFM is a fuel management system, at least its the main load sensor of one..

futhermore, there is not much diagnostics to be done on a ca18det ecu, it does not even have a conzult port, only a few flash codes. have the car looked at by somebody that actually knows these cars, it is very likely that one of the sensors of the management is fubar.

I was really hoping this would be good news

It is. 300sx is very kindly saving you some $$$

Before you do anything further.
1) Download the FSM (just do a search here for a link or google, I'm too lazy to do it ATM)
2) check error codes on ECU
3) diagnose and fix all relevant codes