Peugeot 2.0 Hdi 90...interesting ECU question. Rev limiter?
Discussion
Hi everyone here’s an interesting question.
We’re attempting to export our motorhome to Switzerland and the local requirements are for it to demonstrate a MAXIMUM rpm during the emissions test. They literally go foot to the floor and measure the rpm at the engine with their equipment. Ours fell 50 rpm short of the required number (including tolerances) at test.
It has a Peugeot 2.0 Hdi turbo 90hp engine. 2005. The engine code is DW10TD. The base vehicle is the Peugeot Boxer van.
The "book figure" from the Swiss is 5,000 rpm +/- 200 rpm and we're achieving 4,750 measured directly at the engine using their kit, not the rpm gauge. They actually run it up to full rpm SIX times and it always stopped at 4,750.
Chat GPT (yes, I know...) mentioned that this unit just might have a hard rev limit coded into the ECU that limits it to around 4,750 or 4,800, in which case we'll never meet this target. Anyone know if this is the case or if we can plug it in at the dealer to check?
I don't want to mess with the ECU but if the rev limiter does exist, we can just get the official paperwork corrected so we can get measured against something that we can actually achieve. I have no idea where the 5,000 target came from and may well be incorrect.
If not, it might be a genuine issue with the engine but before we begin taking things apart I just wanted to check this.
Oh there’s no fault codes with our basic Amazon code reader and the thing drives fine. Although it has never been powerful, especially at 3,200kg. The omissions just looked at opacity which was 0.12.
Any thoughts??
We’re attempting to export our motorhome to Switzerland and the local requirements are for it to demonstrate a MAXIMUM rpm during the emissions test. They literally go foot to the floor and measure the rpm at the engine with their equipment. Ours fell 50 rpm short of the required number (including tolerances) at test.
It has a Peugeot 2.0 Hdi turbo 90hp engine. 2005. The engine code is DW10TD. The base vehicle is the Peugeot Boxer van.
The "book figure" from the Swiss is 5,000 rpm +/- 200 rpm and we're achieving 4,750 measured directly at the engine using their kit, not the rpm gauge. They actually run it up to full rpm SIX times and it always stopped at 4,750.
Chat GPT (yes, I know...) mentioned that this unit just might have a hard rev limit coded into the ECU that limits it to around 4,750 or 4,800, in which case we'll never meet this target. Anyone know if this is the case or if we can plug it in at the dealer to check?
I don't want to mess with the ECU but if the rev limiter does exist, we can just get the official paperwork corrected so we can get measured against something that we can actually achieve. I have no idea where the 5,000 target came from and may well be incorrect.
If not, it might be a genuine issue with the engine but before we begin taking things apart I just wanted to check this.
Oh there’s no fault codes with our basic Amazon code reader and the thing drives fine. Although it has never been powerful, especially at 3,200kg. The omissions just looked at opacity which was 0.12.
Any thoughts??
It's a "normal" diesel MOT test for emissions/smoke.
Yet I've never had one person explain to me any logic behind revving the s
t out of an engine, off load, in a way that in the vehicles entire operational life it would never be revved to by a normal sane person.
Despite it being part of a UK and further afield MOT, pretty sure most don't actually do it due to the insanity.
Some vehicles may have different limits when it knows the vehicle is stationary, or in neutral lower than what might be it's normal limited though as they have more control options than an old mechanical diesel where it would literally rev to it's max the governor allowed.
But as others have said, maybe a Swiss vehicle may have a different programming to suit Swiss regs. Maybe get a Swiss remap company to flash something in
Yet I've never had one person explain to me any logic behind revving the s
t out of an engine, off load, in a way that in the vehicles entire operational life it would never be revved to by a normal sane person.Despite it being part of a UK and further afield MOT, pretty sure most don't actually do it due to the insanity.
Some vehicles may have different limits when it knows the vehicle is stationary, or in neutral lower than what might be it's normal limited though as they have more control options than an old mechanical diesel where it would literally rev to it's max the governor allowed.
But as others have said, maybe a Swiss vehicle may have a different programming to suit Swiss regs. Maybe get a Swiss remap company to flash something in
I can't post an image here but here are the results of the test. 6 runs all with no load MIN and MAX rpm.
800 4695
800 4735
800 4750
800 4750
800 4750
800 4750
If it was an induction leak or something I would expect some variability perhaps as it can measure to the nearest 5 rpm. The fact that is hits this 4750 limit consistently point to something else???
Regularly serviced, engine warm etc.
800 4695
800 4735
800 4750
800 4750
800 4750
800 4750
If it was an induction leak or something I would expect some variability perhaps as it can measure to the nearest 5 rpm. The fact that is hits this 4750 limit consistently point to something else???
Regularly serviced, engine warm etc.
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