EF XR 6 Air/Fuel Ratio on Dyno - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

redGhia · 09-20-2004, 00:39

Hi guys,

I have just finished a dyno run to have al look at A/F ratios, because i have just had a 12 month old cat collapse on me i assume due to excess fuel because there are no dents in the body of the cat

Unfortunatly my scanner is buggered, but the highest a/f reached was 11.0, compared to the ideal of around 13

Run started at 12.1 at 72kph and gradually richened up to 11.00 at 170kph

Dyno man says that if i was to put a malpassi rising rate regulator on they could lean it out to correct levels

My question:

Does anyone else have any other ideas i thought theat the non xr's ran a diffrent reg. would this be any good for what im after

Ps. The car made 125.7 rwkw

Any help greatly appreciated

Thanks

Ash

jonbays · 09-20-2004, 00:56

This sounds pretty typical.

You could just change to a std non xr pressure regulator which would lower the fuel pressure fairly cheaply. An adjustable one will take a bit of setting up and control which is not so obvious. Thats why the Unichip just knocks back the duty cycle and adjusts the mixture despite the fuel pressure as long as its high enough for full throttle and yours is in a big way.

This is way to rich for top performance.

redGhia · 09-20-2004, 01:57

the guy said about $200 for the regulator, $120 for setting it on the dyno and then adapting it to fit the rail is extra

So the std one would work fine ?? i should have turned this into a poll

MustangNicko · 09-20-2004, 02:33

Ive used the standard one before on my EL XR6 and noticed that the car definetly feels smoother and seems to have a bit more power. One great thing was turning on the car and not having the garage stinking like a petrol station. One bad thing is that up around the high revs (just before redline in the last couple of hundred revs) it would pop sometimes.

redGhia · 09-20-2004, 02:37

was that running premium nicko

MustangNicko · 09-20-2004, 02:45

Sure was mate. It has to because I've advanced my ignition timing.

redGhia · 09-20-2004, 02:53

so was it pinging with premium std reg. and a timing change

redGhia · 09-20-2004, 05:42

Anyone else have any info on the diffrence between std and xr pressure regulators, i want to look into this as much as possible before i do anything, alas what ever way i go i will get it set up and tested on the dyno

redGhia · 09-20-2004, 05:45

EF injectors

HA Ha just the info i needed, thanks guys

MustangNicko · 09-20-2004, 15:26

Quote:

Originally Posted by redGhia

Anyone else have any info on the diffrence between std and xr pressure regulators, i want to look into this as much as possible before i do anything, alas what ever way i go i will get it set up and tested on the dyno

The standard reg flows 270kpa and the XR one flows 300kpa.

Re: Pre-detonation. Doesnt ping at all mate and definetly runs smoother. I pickup up the regulator from a wreckers for $65 bucks compared to Ford's $170 for a new one.