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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Datalog: Boost graph question



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      01-25-2010, 07:20 PM   #23
dtp3347
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Quote:
Originally Posted by Panoz View Post
Here I am again...

It was not raining today so i thought i would take the car out for testing.



I still think that something is not right. My boost graphs seems to slightly decline as long as revs increases (something that was not happening on my original logs).

Any ideas?
Are you saying you think that it is weird that boost is tapering downward towards the redline?

That is completely normal and that's actually a very slow taper compared to previous versions.
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      01-25-2010, 07:24 PM   #24
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My IATs was ridiculously low... I think there should be no tampering down.

Look on my second long above. Boost is 14psi (13,5 reall) at 6300revs.
I think the car should have kept the maximum boost at these revs
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      01-25-2010, 07:25 PM   #25
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are you running the v4 maps? There is no oil/IAT compensation yet, so it shouldn't taper more or less based on those temps
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      01-25-2010, 07:28 PM   #26
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Quote:
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are you running the v4 maps? There is no oil/IAT compensation yet, so it shouldn't taper more or less based on those temps
Its still V3...i want to be sure i have no leaks before going to V4.
My IAT was extremely low at all times (20-25 C).
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      01-25-2010, 07:32 PM   #27
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Quote:
Originally Posted by Panoz View Post
My IATs was ridiculously low... I think there should be no tampering down.

Look on my second long above. Boost is 14psi (13,5 reall) at 6300revs.
I think the car should have kept the maximum boost at these revs
Boost is always supposed to taper atleast slightly towards redline. Always. I dont remember the last time I saw a log that had boost at the exact same psi through the whole rev range and I believe holding max boost at redline is a bad idea?
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      01-25-2010, 07:34 PM   #28
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panoz, why not just try v4 and see how the graphs look? you can always go back
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      01-25-2010, 07:39 PM   #29
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Quote:
Originally Posted by dtp3347 View Post
Boost is always supposed to taper atleast slightly towards redline. Always. I dont remember the last time I saw a log that had boost at the exact same psi through the whole rev range and I believe holding max boost at redline is a bad idea?
This should be happening from 6500revs onwards, but i see that it happens earlier on my logs
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      01-25-2010, 07:43 PM   #30
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Quote:
Originally Posted by Panoz View Post
This should be happening from 6500revs onwards, but i see that it happens earlier on my logs
From my understanding boost should taper in a fairly straight line down from peak > redline but I might be wrong.
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      01-25-2010, 07:45 PM   #31
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panoz, just load up the latest v4 map/firmware and see what happens. use the + map so there is very little taper
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      01-25-2010, 08:09 PM   #32
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Quote:
Originally Posted by jpsimon View Post
panoz, just load up the latest v4 map/firmware and see what happens. use the + map so there is very little taper
+1...if it tapers the same way as the logs you posted, then you take it from there, but without trying you will never know!
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      01-25-2010, 09:00 PM   #33
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Quote:
Originally Posted by dtp3347 View Post
Are you saying you think that it is weird that boost is tapering downward towards the redline?

That is completely normal and that's actually a very slow taper compared to previous versions.
+1 That looks completely normal to me.

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