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 Old 03-16-2017, 11:04 PM   #1
 
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Default BNR S3, high boost/high WGDC and low air flow

So I'm trying to help a friend get his setup sorted out for a local event and then before he reaches out to a professional e-tuner.
He just got his BNR S3 and meth kit on and for some reason the boost we see from his BNR compared to the targeted load is pretty high for what I was expecting.

The setup is pretty much like this:
- custom TMIC;
- BNR S3;
- eBay catless downpipe;
- AEM meth kit spraying through a 500cc/min nozzle;
- HTP 3" intake;
- 3BAR MAP sensor;

I attached a 3rd-4th gear pull log, mind that the load targets are not hit even in the mid range (say 5000rpm).
The MAF cal was scaled down 5% to compensate for the meth spray and apart from slightly higher target load we don't have any major deviations from an OTS versatuner tune.

What can cause this significant strain on the turbo (both boost and WGDC) without seeing air flow values accordingly? We never had in mind 24PSI on this turbo, more like 21-22, but that's where it landed after targeting load values which are perfectly attainable o exceedable even on a stock K04 with similar flow mods.
Attached Images
File Type: gif load-targets-4th.gif (8.7 KB, 13 views)
Attached Files
File Type: csv 3MPS_BL-Data log - 2017-03-15 15.21.23.csv (17.5 KB, 4 views)
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 Old 03-17-2017, 10:08 AM   #2
 
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Default

3bar map sensor, the map scalar tables need to be adjusted.
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 Old 03-17-2017, 06:50 PM   #3
 
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Default

I found that running Meth messed up my cfm and loads, depending on how you scaled your MAF etc. I tried loading that run in Vdyno real quick, but couldn't get it to make sense. You might try that, but cutting it down to one gear.

I just made it so my AFRs were dialed in, my CFM is below 300 but Vdyno says I hit over 350 whp. I left it like this, because it was running well, etc

Run it thru Vd and see if the same is happening to you.
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 Old 03-18-2017, 05:53 AM   #4
 
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Originally Posted by tek_88 View Post
3bar map sensor, the map scalar tables need to be adjusted.
Ok, we'll try some new values next time, however the high WGDC and low air flow remains.
ALso when WGDC exceeds like 90% we start seeing KR at the same loads and BATs where previously we had clear runs, which makes me think that the turbo indeed works hard and all that air flowing through the turbo only (less than 10% goes around it through the wastegate) is the source of knock.

Originally Posted by sheston View Post
I just made it so my AFRs were dialed in, my CFM is below 300 but Vdyno says I hit over 350 whp. I left it like this, because it was running well, etc

Run it thru Vd and see if the same is happening to you.
Fortunately in this case all was consistent... We've seen the same cfm (well, g/s) before meth and after adding meth prior to scaling the MAF. And now the current runs are consistent with what we've seen before adding meth, just that the turbo seems to work very hard to get those. It did work hard before meth as well, but now when we tried to extract more load we had the unpleasant surprise to see that the numbers we've seen before were actually the limit of the whole setup as it was then and as is now.
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 Old 03-18-2017, 07:29 PM   #5
 
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Default

Something blocking the exhaust or TMIC flow? Air straightener come loose?
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