Replacing ECU

FGII-XR6 · 10-05-2007, 06:09 PM

does anyone know how to get a replacement ECU to rork without taking it to ford to get ripped off ( they want $80 for what they admitted will take all of 5 minutes that equals $960 an hour i'm in the wrong game)? i am puting an XR ECU in my SR but need to get the BEM to talk to it tried the learn mode from the manual where you leave it on for upto 61 minutes to relearn but no luck any help would be appreciated

Tech Trainer · 10-05-2007, 07:35 PM

Going by the sounds of it you have a Smart Sheild vehicle.

Find a mechanic who has an up to date scan tool and he should be able to do. The aftermarket have been able to do the "handshake" as they call it for a couple of years now.

I am sorry to inform you that it will not take "5 minutes". Whether they like it or not it will take a minimum of twenty minutes to half an hour. Having said that $80 is about right when you think that dealerships and most workshops have a minimum charge for any work done. This is usually half a hours labour.

LOWAU · 11-05-2007, 08:57 AM

Maybe try another Ford dealer? if there is any avaliable.

Also let us know how you go after its installed, I always wanted to do this.

JC · 11-05-2007, 11:29 AM

$80 is not unreasonable.

xr8ute · 11-05-2007, 04:48 PM

This is a 4.0L i6 right?

Bear in mind, the XR6 had a higher pressure fuel reg than non-XR's. If you where to swap in an XR6 ECU without also adding the XR6 fuel reg, then you will run lean....this is bad.

FGII-XR6 · 13-05-2007, 04:11 PM

Quote:

Originally Posted by xr8ute

This is a 4.0L i6 right?

Bear in mind, the XR6 had a higher pressure fuel reg than non-XR's. If you where to swap in an XR6 ECU without also adding the XR6 fuel reg, then you will run lean....this is bad.

I have been told this by quite a few people but according to ford service ford parts and the parts database on this site there is only the one fuel reg for all I6 engines i have looked at the one on an XR6 with the HP engine and it was also the same don't get me wrong if you know differently i would appreciate any part numbers you have so I can go to my ford dealer and get what i need but to date all points to the one reg

FS5 · 13-05-2007, 06:26 PM

Quote:

Originally Posted by au3xr6

I have been told this by quite a few people but according to ford service ford parts and the parts database on this site there is only the one fuel reg for all I6 engines i have looked at the one on an XR6 with the HP engine and it was also the same don't get me wrong if you know differently i would appreciate any part numbers you have so I can go to my ford dealer and get what i need but to date all points to the one reg

i have seen both the standard and xr6 regs .standard is 2.7 bar /xr6 is 3.5 bar.
mind you i ran a xr6 motor with its 3.5 bar reg on a standard au i6 ecu
and going dy the DTE and black tail pipe it wasn't running lean

xr8ute · 13-05-2007, 06:47 PM

Quote:

Originally Posted by FS5

mind you i ran a xr6 motor with its 3.5 bar reg on a standard au i6 ecu and going dy the DTE and black tail pipe it wasn't running lean

XR6 reg with a non-XR computer means it would be running rich

FS5 · 13-05-2007, 07:11 PM

Quote:

Originally Posted by xr8ute

XR6 reg with a non-XR computer means it would be running rich

sorry to go off track a bit ,but now i have put my old cam back in and the j3,you reckon my my egine might be running a bit rich. considering its now running the xr6 3.5 bar reg and the j3 was tuned to the 2.7 standard au one.

i thought your AFR's were determend by the o2 sensor?

spark/timing maps though???????

AUXRVIII · 13-05-2007, 06:16 PM

Engine at idle I6 pressure is 225kpa, I6HO pressure is 250kpa.
Engine off I6 275kpa, I6HO 300kpa.

b2tf · 13-05-2007, 06:25 PM

GlennBA did this to his old AU and hit problems with the fuel regulator,solution was to get an XR fuel rail.

bodes-sh · 13-05-2007, 08:09 PM

the afr's are controlled by the ecu through the o2 sensor, but think about it, a forte ecu has been programmed to run an injector pulse based on a 2.7 bar fuel reg, pump 3.5 bar into it and even if it's running the injectors as short pulsed as possible, it's not allowing for the extra pressure...if that makes sense

FGII-XR6 · 13-05-2007, 08:27 PM

Quote:

Originally Posted by bodes-sh

the afr's are controlled by the ecu through the o2 sensor, but think about it, a forte ecu has been programmed to run an injector pulse based on a 2.7 bar fuel reg, pump 3.5 bar into it and even if it's running the injectors as short pulsed as possible, it's not allowing for the extra pressure...if that makes sense

this is true but these ECUs are clever buggers if they still see it's lean it will compensate till it gets it right

xr8ute · 13-05-2007, 08:54 PM

Quote:

Originally Posted by au3xr6

this is true but these ECUs are clever buggers if they still see it's lean it will compensate till it gets it right

There is a self-imposed limit to the correction that the EEC will apply based on O2 sensor feedback. I suppose to make sure that if the O2 sensor itself fails (and sends radically incorrect feedback), that it doesn't change the fuel mix enough to cause damage the engine.

AUXRVIII · 13-05-2007, 09:48 PM

Quote:

Originally Posted by xr8ute

There is a self-imposed limit to the correction that the EEC will apply based on O2 sensor feedback. I suppose to make sure that if the O2 sensor itself fails (and sends radically incorrect feedback), that it doesn't change the fuel mix enough to cause damage the engine.

Generally the limit is around 25 to 30%. If there is no O2 feedback adaptive tables are ignored, a preset map is used based on other inputs such as engine temp, tps and map sensor.

FGII-XR6 · 16-05-2007, 05:11 PM

well got the ECU in an auto elec charged 45 and i was theter when he did it i was driving away in 15 minutes that included the time it took me to change ECUs ant the parameter reset tested the adaptive shift settings and it changed modes fine better shifts and seems to have a bit more grunt

xr8ute · 16-05-2007, 05:23 PM

So you've fitted an XR6 ecu to a non-XR6, and you still have the std non-XR6 fuel pressure regulator?

FGII-XR6 · 16-05-2007, 05:54 PM

thats going in tomorrow cam not going in till next week had to order it in

robbo_yobbo · 16-05-2007, 07:44 PM

I actualy thought it was the fuel pump itself that pumped a higher capacity on the xr vs the forte

xr8ute · 16-05-2007, 08:31 PM

Quote:

Originally Posted by robbo_yobbo

I actualy thought it was the fuel pump itself that pumped a higher capacity on the xr vs the forte

A bigger fuel pump will not change the fuel pressure, thats the job of the regulator. The regulator acts as a resistor against the flow of the fuel pump. It blocks the flow (from the pump) just enough to maintain its set fuel pressure. Any excess fuel is diverted back to the fuel tank.

So if your existing fuel pump was already flowing enough, but you then put a bigger one in, all that extra flow capacity would bypass the reg and go straight back into the fuel tank.

FGII-XR6 · 31-05-2007, 06:11 PM

got the cam in. idled like a pig but i did my favourite procedure the ECU reset ( I know some of you think it's a waste of time but did the trick)and runs like a dream. hope to get it on the dyno soon I let you know how it goes

LOWAU · 01-06-2007, 10:09 AM

What cam did you end up getting?

FGII-XR6 · 03-06-2007, 06:30 PM

genuine XR6 HP cam and the matching ECU with the red back catback extractord and intake it goes heaps better than a standard I6