Requested Boost and Actual Boost
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Requested Boost and Actual Boost
Hi Everyone.
How close should these two figures be??
I have something like 200mBar or MORE difference between them, the Actual Boost is always lower than the requested boost.
I know that the Turbo's produce Boost from about 3000-3500 and up.
Does this indicate a problem, leak, faulty N75?
I have checked the TBB (it is Good) and just replaced the BPV's.
Here is what I am seeing with VAG-Com,
block 115
3rd gear run on the highway
RPM----Engine Load--Requested--Actual
2800---45.9---------950--------1050
2920---92.5---------1300-------1170
3240---178.2--------2130-------1850
3600---160.9--------2190-------1730
3960---156.4--------2190-------1720
4280---153.4--------2130-------1730
4680---145.9--------2060-------1720
5040---151.1--------1980-------1790
5400---148.1--------1910-------1800
5720---139.1--------1850-------1730
6000---135.3--------1810-------1720
6280---133.8--------1810-------1730
6520---135.3--------1810-------1760
6680---134.6--------1810-------1770
5480---11.3---------950--------1170
Appreciate any comments
Cheers
Steve
How close should these two figures be??
I have something like 200mBar or MORE difference between them, the Actual Boost is always lower than the requested boost.
I know that the Turbo's produce Boost from about 3000-3500 and up.
Does this indicate a problem, leak, faulty N75?
I have checked the TBB (it is Good) and just replaced the BPV's.
Here is what I am seeing with VAG-Com,
block 115
3rd gear run on the highway
RPM----Engine Load--Requested--Actual
2800---45.9---------950--------1050
2920---92.5---------1300-------1170
3240---178.2--------2130-------1850
3600---160.9--------2190-------1730
3960---156.4--------2190-------1720
4280---153.4--------2130-------1730
4680---145.9--------2060-------1720
5040---151.1--------1980-------1790
5400---148.1--------1910-------1800
5720---139.1--------1850-------1730
6000---135.3--------1810-------1720
6280---133.8--------1810-------1730
6520---135.3--------1810-------1760
6680---134.6--------1810-------1770
5480---11.3---------950--------1170
Appreciate any comments
Cheers
Steve
#3
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Re: looks lie a boost leak...graph the two curves in excel to get a chart like this...
Thanks for the graph,
I built a leak tester today, so this weekend I am on the hunt for leaks, Fingers crossed I can find one, or all of them and be back to 100%
Appreciate your reply and the graph
Cheers
Steve
I built a leak tester today, so this weekend I am on the hunt for leaks, Fingers crossed I can find one, or all of them and be back to 100%
Appreciate your reply and the graph
Cheers
Steve
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