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(1) Confirmed that neither Hymer has an ODB II port, so the ECU has to come out to be reprogrammed.
(2) Just had a call to say that the original chips in the ECU cannot be reprogrammed so new chips are on order and should arrive tomorrow a.m. - job to be finished by early afternoon.
(3) Confirmed that the turbo boost is controlled by the ECU in this model.
The two ECUs look identical - so they were marked up to make sure they went back in the same Hymer
One Hymer is 2001 (Y) reg. and the other is 2002 (02) reg.
Both engines are the 2.8JTD.
Now all done.
The first test drive was encouraging and there seemed to be a lot more 'go' than before.
Coming up a slip road in fourth was particularly impressive.
Can't comment on increased MPG until after a long run, which won't be for a bit.
The other Hymer is off on its travels next week so that should be a good guide to any improvements.
We have been told that the ECU will take a couple of weeks to settle down as it learns the driving style and adapts.
One interesting thing we discovered; on a 'fly by wire' system the ECU can respond differently to a throttle being gently opened to full and someone flooring the throttle immediately.
Makes sense, but not something I had considered before, being used to cable throttles.
[Then again, did some carbs used to have a throttle pump which would chuck in extra fuel if your floored the accelerator? Long time ago, now...]
Will report back in a few weeks when we have more data.
I ve now done a 200 mile trip on country lanes and motorway with all passengers and everything full and the results are fully in!
on the motorway i cruised into a modest headwind at 70 and if pushed a little at times it felt like it would run away, but a wheel wobble made it comfier to ease off.......(it has stainless trims on that dont seem to fit centraly.)
country lanes, nippy is the word...and on one long very steep hill it just slipped below 40...
fuel consumption strangely hasnt changed at 25/26 and is not what i expected but am chuffed with...
2.8 JTD Power was launched in 2004
Main characteristics are, 146 BHP, 310 Nm torque.
Bigger turbo with variable geometer vanes
Bigger inter-cooler
A 'flat' torque curve from 1500 RPM to over 3,000.
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Hi,I have a 2000 544 2.8 i.d. TD,and the bhp is 122.
I have just had a mechanical tune,it is suggested it is now 145bhp.You can check,www.candmauto.co.uk,Mark is good
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Hi,I have a 2000 544 2.8 i.d. TD,and the bhp is 122.
I have just had a mechanical tune,it is suggested it is now 145bhp.You can check,www.candmauto.co.uk,Mark is good
How do you know the BHP? Has it been on a rolling road?
Amazing difference not needing to change gear,so much,lower revs mpg must be better although i have not had a good check yet.I was having 24mpg before.The response thru all the gears is so different and hills are now a breeze.It cost £225,which i think is good.
______________________________________________________________ Take only photos
Leave only footprints
Steal only time
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