EGR system

[doga-ot]

I have just fitted a BOA into my saph and have kept all the EGR engine is in now and everything is fitted except the EGR anyone have pics so I can see how the pipes go etc many thanks

WES

[tabetha]

Ditch the EGR is the best bet!!

[capri v8 driver]

Keep it. The engine will run smoother en beter with it with less fuel consumption. The reason is that the BOA ecu doesn't compensate for the loss of the EGR, so it will have a wrong fuel/air mixture when the EGR should be working. The ecu will detect a lean condition, but cannot compensate fast enough.

1 vacuum hose comes from the throttle body and goes to the vacuum solenoid, from there it goes to the EGR. One hose comes from the exhaust manifold and goes to the exhaust pressure transducer. That's it.

[Gareth]

Interesting, when I had my Scorpio 24V blanking off the egr made a noticeable improvement. I'd have thought the fuel trims would have taken car of the lean condition?

[capri v8 driver]

Like I said, the ecu will detect a lean condition, but cannot compensate fast enough. This is manly the fault of the slow reacting and limited range of the lambda sensors.

The BOA ecu doesn't compensate for the loss of the EGR, so it doesn't turn of the EGR function.  The ecu runs a different fuel/air map and adjust the timing when the EGR is active. Now, you remove the EGR, the ecu still keeps using the EGR mapping, hence a drop in performance in the midrange rpm (lean condition and wrong timing).

To compensate for the lean condition in the midrange rpm, some people use bigger injectors, but this can cause other fuel/air problems because the ecu is not setup for the bigger injectors.

[mk22door]

I take it this is okay when you are using an aftermarket ECU?

[capri v8 driver]

With a aftermarked ecu, removing the EGR is not a problem.

[Dave2302]

Not a problem on the BOB EECV either.............

I can switch the EGR off in the binary, so the ECU no longer references the EGR multipliers, and no fault code comes up 

Cheers Dave

[tabetha]

I can't understand modders using the std ecu, sorry I mistakenly assumed they'd ditch that first.
tabs

[Dave2302]

Only because no one could map them, lets face it a Ford EECV is a far better ECU than anything that the aftermarket has to offer.

The problem was that there was no definition info for them, each Ford EEC has different address locations, uses different strategy.
With help from a buddy who used to program I have got the 24V ECU sussed now and can alter over 150 diffent perameters 

Cheers Dave

[capri v8 driver]

Tweecer uses caledit witch has the def and cal files for the 24v boa ecu's, so you can mod you own ecu. The plan was to also do this with the bob ecu's.

lets face it a Ford EECV is a far better ECU than anything that the aftermarket has to offer.

That's true. even a eec iv is superior to most aftermarket systems.

[scud]

Like I said, the ecu will detect a lean condition, but cannot compensate fast enough. This is manly the fault of the slow reacting and limited range of the lambda sensors.

can these be upgraded without replacing the ecu?

[capri v8 driver]

can these be upgraded without replacing the ecu?

No. The ecu hardware is setup for the small range lambdas, not for a wide range lambda.

[scud]

yeah it did seem to easy

[Dave2302]

Like I said, the ecu will detect a lean condition, but cannot compensate fast enough. This is manly the fault of the slow reacting and limited range of the lambda sensors.

can these be upgraded without replacing the ecu?

When I switch off the EGR on the EEC V because the ECU then knows there is no EGR fitted, its strategy then no longer refers to the EGR fuel and ignition multipliers, so therefore the engine will not be leaned off or advanced up by the ECU, so yes it does work.

As for the EEC IV, provided the Cal Edit program has the EGR PID identified, then switching it off should have exactly the same result 

In short, yes switching it off within the ECU stops the lean condition 

Cheers Dave

[3 door 4x4]

With the EGR disconnected, mine made 166 BHP at the wheels (4x4) - assume 25% loss in 4x4 drivetrain - transfer box was low on oil as was the front diff and the brakes were binding a little - that's 221 BHP at the flywheel. Had BOB cams, Vectra injectors, K&N and a custom exhaust.

With the EGR connected it  was more torquey and felt a lot more lively. Especially mid range. EGR isn't used at wide open throttle so that makes sense!


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[capri v8 driver]

With the EGR connected it  was more torquey and felt a lot more lively. Especially mid range. EGR isn't used at wide open throttle so that makes sense!

Real live experience.

I also found that the fuel consumption was less with the EGR connected.   

From Dave2302

As for the EEC IV, provided the Cal Edit program has the EGR PID identified, then switching it off should have exactly the same result  Wink

It can be turned off with the tweecer and caledit.