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My first boost graph (awwww)...

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Old 02-07-2005, 10:23 AM
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Default My first boost graph (awwww)...

<center><img src="http://pictureposter.audiworld.com/79676/020505_boost_graph.jpg"></center><p>Hey guys, this is my first boost graph I put together. I just got my VAG last week and finally got a chance to play with it this past weekend. I'm pretty sure I did this right, recorded blocks 115 and 116, then I transposed the data to excel. The runs were not WOT but close to it in 1st and 2nd gears, 2 runs consecutively (completely stock).

As far as these graphs go, would these give you your best diagnosis as to whether or not you have a boost leak? I don't know what they should or shouldn't look like and what to look for as far as boost leak. Do you guys mind checking this out and see if I did this right or not? I may have done this completely wrong for all I know. I'm still semi-noob so I'll take any criticism you have (good or bad).
Old 02-07-2005, 10:29 AM
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Unfortunately it's hard to tell in only 1st and 2nd gear - really need a 3rd gear pull in there
Old 02-07-2005, 10:32 AM
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Yeah, log a 3rd gear pull from low RPMs to redline.
Old 02-07-2005, 10:40 AM
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Default What is block 116? I've never seen that logged by anyone before.

I suggest you log block 115 alone at wide open throttle (WOT). You can either do a single gear (3rd preferred) or you can do 1st-2nd-3rd log. Here is a few examples of boost logs:
3 Gears:
<img src="http://img.photobucket.com/albums/v654/DocSlow/LOG-01-115-MBC.gif">

2 Gears:
<img src="http://pictureposter.audiworld.com/69223/block_115-mbc_and_n75_in_parallel.jpg">

1 Gear:
<img src="http://pictureposter.audiworld.com/69223/block_115-mbc_only-57d.jpg">

Actual and requested boost should follow each other relatively closely unless there are outside variables affecting boost, such as a manual boost controller (MBC). All 3 of these logs above have a MBC involved, which explains the actual and requested not following eachother exactly.
Old 02-07-2005, 10:46 AM
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2nd
Old 02-07-2005, 10:56 AM
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oops, 116 was something else. I'll do a 3rd gear run at WOT to test, thanks for the input.
Old 02-07-2005, 10:59 AM
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I'll do that, thanks. So what indicates a boost leak, how much difference would raise an eyebrow?
Old 02-07-2005, 11:45 AM
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i have two 3rd gear pulls in my pic poster. stock.
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