|
Diesel Engines A forum dedicated to diesel engines fitted to Volvo cars. See the first post in this forum for a list of the diesel engines. |
Information |
|
The 6805 Boost pressure riddleViews : 2195 Replies : 20Users Viewing This Thread : |
|
Thread Tools | Display Modes |
May 3rd, 2021, 08:23 | #11 | |
New Member
Last Online: Mar 2nd, 2022 21:12
Join Date: Mar 2021
Location: Richmond
|
Quote:
The temp gauge reads normal (half way) when up to temperature. That is an interesting point though. We also have an iveco van we bought to convert to a camper and coolant along with fuel temps effect how the ECU manages the engine. I will do a live data session on it today and see what the temp gauge is reading and post here what the results are. Thank you Camturbo |
|
May 3rd, 2021, 15:00 | #12 |
New Member
Last Online: Mar 2nd, 2022 21:12
Join Date: Mar 2021
Location: Richmond
|
We did some live data testing today and these are the results:
At Idle: Coolant Temp - 49.6 degrees C Inlet air temp - 11.2 degrees C MAF - 52.10 kg/h Boost Pressure - 991 hpa Atmospheric - 967 hpa Stationary at 1500 RPM Coolant Temp - 53.4 degrees C Inlet air temp - 10.3 MAF - 70.70 kg/h Boost Pressure - 1039 hpa Atmospheric - 967 hpa Stationary at 2500 RPM Coolant Temp - 54.1 degrees C Inlet air temp - 10.3 degrees C MAF - 212.30 kg/h Boost Pressure - 1134 hpa Atmospheric - 968 hpa Driving at 60mph (2000 RPM) Coolant Temp - 87.8 degrees C Inlet air temp - 8.3 degrees C MAF - 200.60 kg/h Boost Pressure - 1487 hpa Atmospheric - 980 hpa Driving at 70mph (2500 RPM Slightly downhill though) Coolant Temp - 87.1 degrees C Inlet air temp - 8.4 degrees C MAF - 191.40 kg/h Boost Pressure - 1105 hpa Atmospheric - 981 hpa Another test was to accelerate up to 4000 RPM and the boost pressure read 2170 hpa. After the drive we let it idle and these were the readings: Coolant Temp - 86.7 degrees C Inlet air temp - 8.4 degrees C MAF - 48.70 kg/h Boost Pressure - 1026 hpa Atmospheric - 973 hpa We did notice that the boost pressure did hang at its high value for 3 to 4 seconds before dropping off when easing off the accelerator pedal. Is this normal?? Hopefully this will help someone with far greater knowledge than us to figure out what our issue is... |
May 3rd, 2021, 18:53 | #13 | |
Senior Member
Last Online: Mar 27th, 2024 06:04
Join Date: May 2017
Location: martock
|
Quote:
__________________
|
|
May 3rd, 2021, 18:55 | #14 |
Premier Member
Last Online: Yesterday 12:32
Join Date: Mar 2017
Location: Manchester
|
what does your live data show when it drops into limp mode?
|
May 3rd, 2021, 19:29 | #15 | |
Premier Member
Last Online: Dec 26th, 2021 13:42
Join Date: Dec 2013
Location: Crewe
|
Quote:
It sounds as though the VNT is sticking slightly on its way back at cooler operating temperatures and frees itself to perform pretty normally on a hot engine.
__________________
2002 S60 SE D5 Manual 209000 miles |
|
May 3rd, 2021, 19:50 | #16 |
New Member
Last Online: Mar 2nd, 2022 21:12
Join Date: Mar 2021
Location: Richmond
|
The car is an Auto 5 gears and the revs at idle are around 600 to 700rpm
|
May 3rd, 2021, 19:56 | #17 |
New Member
Last Online: Mar 2nd, 2022 21:12
Join Date: Mar 2021
Location: Richmond
|
Hi Simmy, when we tried to get it into limp mode, my mate driving, lifted off the accelerator and quick booted it again... then it came out of limp mode... errrr!! I was hoping to see something obvious, but we never got the chance.
When it goes into limp mode, I slow down and just consciously limp it home. I have never tried just pushing it again. Tomorrow, I am going to try the same and see if it acts the same or stays in limp mode. |
May 3rd, 2021, 19:59 | #18 | |
New Member
Last Online: Mar 2nd, 2022 21:12
Join Date: Mar 2021
Location: Richmond
|
Quote:
|
|
May 3rd, 2021, 20:12 | #19 |
Senior Member
Last Online: Mar 27th, 2024 06:04
Join Date: May 2017
Location: martock
|
Does sound as if it sticking if you throttled off then back on again and it disappeared. Like you say try again tomorrow and see if it happens again. Maybe its got some carbon build up on the turbo vanes. Cant help you with cleaning it,apart from giving it a good caning. Hopefully someone else will be able to help.
__________________
|
The Following User Says Thank You to camturbo For This Useful Post: |
May 3rd, 2021, 22:27 | #20 | |
Premier Member
Last Online: Dec 26th, 2021 13:42
Join Date: Dec 2013
Location: Crewe
|
Quote:
That's my best guess based on the behaviour you've described.
__________________
2002 S60 SE D5 Manual 209000 miles |
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|