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Autometer boost gauge is fluttering at WoT


EfiniX
Member ++
543/1000


Galant VR-4 org Post #: 1222919 posted 01/15/16 11:20 AM     Remind Me!  Send Private Message   Edit Post      
I don't recall this happening before. Just saw it on my way in. Flutters between 21-23 psi or so. Haven't pulled a log yet, so not sure what the car is actually seeing off the omnibar.

Thoughts? Just the way mechanical gauges are sometimes? Wrong boost source? I'm t'ed off the manifold using the same line that goes to the FPR.

In anycase, there was no mechanical or drivability issue that I perceived. Just the needle having a spasm at WoT boost.



RIP 543
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2006 Suzuki SV-650 (for sale)
2011 BMW 335d (~510'lb/tq and 36mpg. hwy. How can you go wrong?)

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biglady112
or what
359/2000


Galant VR-4 org Post #: 1222920 posted 01/15/16 01:16 PM     Remind Me!  Send Private Message   Edit Post      
Normal operation. Smaller the turbo, the more pronounced. The more inferior the wastegate control (internal vs external and big versus small) the more pronounced.

Basically, if your drive pressures suck, a mechanical gauge will jump around. The higher the sampling rate your datalogger has the easier it will be to see it as well. Dsmlink is not very fast or powerful so it does not show how crazy things really are. A racepak, aem, haltec, whathaveyou all show very rapid up and down spikes no matter how awesome the setup is. Just the way the harmonics are. Valves opening and closing and pistons moving up and down.



I GIVE ZERO FUCKS. I HATE YOU ALL.

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ApexHunter
Extreme Indoor Cyclist
1951/2000


Galant VR-4 org Post #: 1222926 posted 01/15/16 07:52 PM     Remind Me!  Send Private Message   Edit Post      
^Sounds about right to me. If you are worried about the integrity of the gauge i suppose you could hook it up to a compressor with a regulator/gauge to get a rough idea of its health.

I've got the display for my MAP sensor setup to read to the tenth. It has pretty good resolution, and as a result, it's never sitting still.


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transparentdsm
I have to say something dumb Member
138/2000


152/1000


Galant VR-4 org Post #: 1222936 posted 01/16/16 06:22 AM     Remind Me!  Send Private Message   Edit Post      
i want your display... that is sexy.. is it in the radio bezel?



138/2000
152/1000

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ApexHunter
Extreme Indoor Cyclist
1951/2000


Galant VR-4 org Post #: 1222939 posted 01/16/16 08:48 AM     Remind Me!  Send Private Message   Edit Post   
Thanks. It's Zeitronix ZT2 / nDash

I'm stoked on it. It works good for my current needs and is fully concealable.



1991 Mitsubishi Galant VR-4 #1951/2000 (SOLD)

Posts: 1977 | From: Marysville, WA | Member Since: 04/25/07 | IP: (2600:1012:b10e:b) | Report this post to a Moderator


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