Hi together.

There is a small screw at the backside of that little square plastic box attached to the metering unit. I've heard that you can increase fuel discharge by turning this clockwise. Can anyone confirm this? And how do professional tuners turn up fuel on MFI cars? Is it necessary at all, as KE-Jet is adjusting fuel automatically? What boost can an untouched KE-Jet cope with?

 

Hi,

Yes the fuel pressure actuator, removed has a screw, if you remove it
there is a allen type key behind it that you adjust to increase the fuel pressure on escort RST,


Dave R.

 

Ah, OK. So is this basically the only way to manually adjust fueling on an MFI car (apart from the CO-screw but that's just for idle I guess)?

 

ALL THE ALLEN TYPE SCREW DOES IS UP THE FUEL PRESSURE !

THE CO SCREW ADJUSTS THE MIXTURE BUT NOT JUST ON IDLE!
AS TUNERS MAKE SURE THE FUELLING IS RIGHT THROUGHOUT THE REV RANGE!

 

Well, my car's really running well at 15 PSI at the moment. The only thing is: It feels like torque is dropping a bit after 4500 rpm. I wonder if I could cure this by giving it more fuel or if it's just the std cam that's a bit restrictive up there.

Otherwise there are no signs of underfueling. Spark plugs look OK, no cutting out, missfires, etc.

 

probably more likely to be boost control issues causing the lack of power at 4500 rpm,wouldnt mess about with fueling unless on rr as more fuel might mean less power at the end of the day mate

 

Well, that's a good point. So I'll just leave it as it is for the moment and put on a -31 actuator to hold boost more efficiently.

But just for the record: How do tuners adjust the fueling? I think KE-Jet does most of the work itself. You only have to make sure that the CO-screw is set to point where it doesn't run too lean and that the fuel distributing part of the metering unit doesn't run out of fuel by keeping an eye on the fuel pressure?

Don't get me wrong here. I'd really like to get the car set up professionaly but Germany isn't the UK. It's really hard to find a decent Ford tuner here and even then they mainly concentrate on Diesel chip tuning

So I really have to do all the stuff by myself, at least trying to learn as much as possible.

 

I'm getting confused with this C0 adjustment! I just found the reason for my car not idling was the C0. I turned it until it idled good. so will this affect the on boost fueling???

sorry for jumping in on your post.

what does the C0 screw exactly do???

thanks

 

would think it could well make your car run lean at higher revs mate,and it may not have been the reason for your car not idling but may have helped to cure it
dont get me wrong mate i do everything to my car myself,but if you dont have the equipment to set up the co just leave it well alone,will do or fit anything to my car but set up is best left to those with the facilities and a bit of knowhow at tweaking works well too
imaguine the co screw would adjust the ratio of fuel to air,beind allowed into your engine

 

In which direction have you turned it? Clockwise will increase CO so should be no problem.

 

but how does this increase the fuel by adjusting the C0 when you increase boost?? MOT people always adjust it at idle for emisions not under load so surley it can't change the ratio under load??

if a tuner tuned the car with the C0 screw to get it to fuel at a set boost pressure under load then it would mess up idle no??

sorry if I'm being stupid??

 

I can't be 100% but sure I turned it anticlockwise?? I turned it both ways as last resort trying to get my car to idle after looking into everything else

 

That's exactly what I don't understand either.

But I guess it's a bit like that: The KE-Jetronic adjusts fueling itself. If it's in good health it will deliver the right amount of fuel even at high boost levels and even with a std CO% setting and good idling.

If they (the tuner) detect that it's running lean at high revs they'll not simply turn up the CO screw but rather search for the fault in the injection system, e.g. a knackered metering unit or injector.

So can somebody confirm that it's like that? If you have a 100% intact injection system will it handle high boost levels even if it's on a std setting?

 

Well to be on the safe side you could just have the idle CO% checked in a garage. Should be between 0,5 - 1,1% on a standard engine.

 

To be picky, the small allen screw does not directly adjust the fuel pressure. Turning it clockwise will lower the control pressure. This will lower the resistance with which the air-flow disc moves down making it go further with the same airflow. The position of the disc then always dictates directly the amount of fuel injected. When the disc has gone to the max, the system won't fuel any more no matter what screws you turn.

 

I just can't believe how many of you guys piss around with your fuelling without the right equipment to check it!!

I can't tell you how many RST's we have seen that barely have enough fuel for idle, but at full boost!! God only knows how they survive.

It only takes for something to be amiss, like the TPS (common on RST's) and any of these 'turn the screw half-a-turn' types of advice will result in a scrap engine.

 

Well, of course the best thing to do is to get it professionally tuned on a RR. I'd never even think about messing around with any screws on a car that has been set up properly.

But my car is a bit of a shed. And it's some kind of miracle that the engine is running at all. After I bought it it had no compression, due to jammed piston rings. And I think somebody has fiddled around with the metering unit before.

So I just take the risk and try to set up the car as good as possible as I simply don't have an opportunity to get is set up professionally.

And well, a blown engine or a melted piston isn't the end of the world...

 

i think most tuners dont adjust the fueling much but adjust the CO then if there isnt enough fuel they say get a fith injector or they increase the fuel pressure which means the Co has to be adjusted again for idle fueling or too much fuel will be delivered at idle.

 

 

hey don't moan too much they are paying your wages and keeping you busy