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Datalog: Boost graph question
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01-20-2010, 04:18 PM | #1 |
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Datalog: Boost graph question
(This has been commented in an other topic but as I wouldnt like to ruin the original discussion i post this new thread here)
I've noticed that after the installation of intercooler ,the boost graph on my datalogs appears some tiny ripples all the way across the log. Is that normal? Does this indicates a boost leak? If it was a boost leak shouldn't it be a considerable boost drop on the graph as the revs increasing? As you see the graph is pretty flat. I've also noticed today that I cannot calibrate my digital boost gauge. It seems like vacum pressure is not steady (gauge is displaying various values between -1psi to +0,5/0,6psi). I would appreciate some opinions on this as i'm not sure what is REALLY going on.
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01-20-2010, 04:19 PM | #2 |
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Looks fine to me?
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01-20-2010, 04:46 PM | #5 | ||
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Quote:
here is another one (in closer view). Have a look on an older datalog i have... Would i really mind the difference? Quote:
Could it be a slightly damaged/scratched vacum hose (solenoid??)??
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01-20-2010, 04:57 PM | #7 |
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Not at all...but i cant find another reason the gauge cant calibrated to 0psi and the boost log starts having (all of a sudden) these ripples.
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01-20-2010, 05:06 PM | #8 |
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solenoid leak, frayed boost hose connection..who knows. Obviously, 1st place to look would be the IC connections..grab a mirror and look all around to see if there are any signs...Good luck.
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01-20-2010, 05:09 PM | #9 |
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The best way to look for signs of a leak is to compare Debug Word 4 (wastegate DC) holding all other things equal (boost, rpm, etc,.) I really doubt you have a leak. Just seems as if you are getting more signal pulsation than before which could be caused by more pressurized volume between the turbo and the throttle body. Just a guess but I really dont think it's anything to worry about. I've seen plenty of logs with that high frequency noise. If you start throwing underboost codes or see wastegate DC jump by noticeable amount, then i'd start looking for boost leaks.
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01-20-2010, 05:28 PM | #10 |
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scalbert scared you huh
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01-20-2010, 11:08 PM | #11 | |
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01-21-2010, 02:02 AM | #13 |
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RiXst3r , is it be possible that a slight leak could mess up the boost gauge functionality? Your gauge was working flawlessly until recently.
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01-21-2010, 03:46 AM | #14 | ||
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I also don't believe that some zip ties, in the connections, will help (just offers some extra secure) because if the hose poped of you will understand it immediatly. Quote:
If you have an intercooler's pipe leak, then that leak wouldn't be small, and you could feel it especially in high rpm (The pressure drop should be constant). But in your graph the boost is "table" until high. So it all seems fine to me... |
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01-21-2010, 03:49 AM | #15 |
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so why this damn boost gauge isn't calibrating?
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01-21-2010, 05:44 AM | #16 |
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What is your procedure to calibrate the boost gauge and which gauge do you own ? I calibrated with engine shut off.
Although the engine will not see the boost spikes while you shift - in case the throttle is closed causing the spike - they seem to be quite high. Using a flash, I currently never spike above 16.5 PSI while shifting ( it's cold here outside, winter season ). Do you see +20 PSI spikes on the gauge as well, by recalling maximum boost ? p.s. does not look like you have a boost leak, IMO. |
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01-21-2010, 08:27 AM | #18 |
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01-21-2010, 10:08 AM | #20 | |
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Guys...thank you so much for helping me out to find out what is going on.
The graph didn't also looked like to me as well having a leak (seems prety steady in terms of boost level) but considering the boost gauge reaction i was really thoughtful Quote:
Its very cold here as well (for our standards) between 5-8 degrees (i'm serious! this is cold for us ). You didnt scare me...it was just the cherry on the pie as i was also very sceptical due to boost gauge reaction.
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01-21-2010, 10:35 AM | #21 |
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Actually, I think you have THE first unit that went out to any customer! the first 4 or 5 units that went out didn't have the same hardware as all of the gauges that I have shipped since... it may actually be causing what you see (when there is no boost or vac, the peizo element will float a bit, causing what you see). We used a different sensor conditioning method on the final version that started shipping almost 2 years ago.
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01-25-2010, 06:09 PM | #22 |
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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?
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boost graph, boost leak, intercooler, vacum |
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