Thread: D5 (D5244T to 2005) - The 6805 Boost pressure riddle
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Old May 3rd, 2021, 18:53   #13
camturbo
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Last Online: Jun 4th, 2021 22:03
Join Date: May 2017
Location: martock
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Quote:
Originally Posted by SushiNinja View Post
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...
What transmission is it? When you did the 70 mph run what gear were you in? Also when fully warm and at idle what is your rev counter reading? No idea about your live data but hopefully someone else does
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