turbo pressure, lagging car
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turbo pressure, lagging car
Hello,
Peugeot 508, 1.6. THP 156Bhp
I suspect my turbo system might be "lagging" - attached are screenshots from a live data session i recorded today - can anyone make sense of it ?
There are some 20-30 values I can record it these do not suffice...
Blessings from the Holly Land...
Peugeot 508, 1.6. THP 156Bhp
I suspect my turbo system might be "lagging" - attached are screenshots from a live data session i recorded today - can anyone make sense of it ?
There are some 20-30 values I can record it these do not suffice...
Blessings from the Holly Land...
Last edited by 508c5 on 16 Nov 2021, 16:12, edited 1 time in total.
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Re: turbo pressure, lagging car
Nothing attached!
Use the full post editor, select attachments and then browse to where the pictures are located, select and then use the 'Place' button to position the pictures within your post.
Use the full post editor, select attachments and then browse to where the pictures are located, select and then use the 'Place' button to position the pictures within your post.
Please Don't PM Me For Technical Help
Marc
Marc
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
508c5 wrote: ↑16 Nov 2021, 16:07 Hello,
Peugeot 508, 1.6. THP 156Bhp
I suspect my turbo system might be "lagging" - attached are screenshots from a live data session i recorded today - can anyone make sense of it ?
There are some 20-30 values I can record it these do not suffice...
Blessings from the Holly Land...
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- Donor 2024
- Posts: 178
- Joined: 15 Oct 2020, 11:37
- Location: Israel
- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
now ? (i can see them now and before as well)
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Re: turbo pressure, lagging car
I can see the graphs.
It does not look like you have any significant boost, the yellow line is more or less flat. Can you see the wastegate actuator rod moving as the engine is revved? Maybe you should check the vacuum on the wastegate control pipe?
It does not look like you have any significant boost, the yellow line is more or less flat. Can you see the wastegate actuator rod moving as the engine is revved? Maybe you should check the vacuum on the wastegate control pipe?
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
Thx, don't know where to look for what you have indicated....is it supposed to be visible?
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
I looked it up, i think mine is basically the same as the one on video, i will check..thx
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
So.... I replaced the boost sensor and i guess the difference can be seen on the pics (and the ride also feels better).
However i am not sure if this is "it", Don't know the reference values
However i am not sure if this is "it", Don't know the reference values
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Re: turbo pressure, lagging car
The new graphs still look wrong. The reference pressure (yellow line) is the pressure that the ECU wants to see out of the turbo, which is between 1000 and 1500 mBar (normal). The black line is the signal to the wategate control valve, which is topping out trying to give maximum boost. The blue line is the actual measured boost which is sitting around 1000 to 1200 mBar, and nothing like the shape of the yellow line. Where the blue line does peak a little is probably where the throttle is closed with the engine revving and the airflow to the manifold is shut off.
The video you have linked is for a diesel engine, but the principal is similar. You can see the vacuum hose to the wastegate actuator here:
You can see here (under the turbo) the control rod that goes from the actuator to the wastegate itself:
With the engine cold (so you don't burn yourself) you should be able to feel the rod moving when the throttle is blipped.
I am surprised that you are not getting fault codes for under-boost.
The video you have linked is for a diesel engine, but the principal is similar. You can see the vacuum hose to the wastegate actuator here:
You can see here (under the turbo) the control rod that goes from the actuator to the wastegate itself:
With the engine cold (so you don't burn yourself) you should be able to feel the rod moving when the throttle is blipped.
I am surprised that you are not getting fault codes for under-boost.
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
Thx
I did get a p0299 fault code but only when reving very strong and in the 4,000 rpms
So if the rod is moving what else could be wrong and treatable..except for the turbo itself failing ?
I did get a p0299 fault code but only when reving very strong and in the 4,000 rpms
So if the rod is moving what else could be wrong and treatable..except for the turbo itself failing ?
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Re: turbo pressure, lagging car
If the rod is moving, then it could be a faulty wastegate valve (which can be repaired), or a faulty dump valve ( the black thing with wires on the end of the turbo). If you google for mini N14 (the same engine), you will find a lot more results, but of course the engine is packed differently into the engine bay and uses different diagnostic tools.
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
The actuator (dump valve) looks fine and is fairly new, he is always my no 1 suspect in cases like this.., i'll try to look at the wastegate
Thx
Thx
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
Looking at the graphs...it seems as if that the yellow/purple and the blak/blue combination have "switched" places after i replaced the sensor. Previously yellow/purple were fairly flat and black/blue were "all over the place" - can we deduce something from this..?
- xantia_v6
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2011 Peugeot 308 CC THP 155 (NZ)
1975 Jaguar XJ-S pre-HE (NZ) - x 835
Re: turbo pressure, lagging car
Nothing has changed, except the scan tool has chosen different colours for each measurement. Look at the labels.
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- My Cars: Citroen c5 (x7) 1.6 petrol thp 156
Peugeot 508 1.6 petrol thp 156
PEUGEOT 3008, 1.6. THP 165 BHP
Renault fluence 1.5, 1.6 - x 4
Re: turbo pressure, lagging car
Well... it's the actuator valve. Looks intact but after switching it with the one from my c5 it was evident that mine was failing