APS 65mm nonuniform flow

nfm · 02-22-2013, 03:28 AM

Just ranting here, scaling OL is getting on my nerves, take a look at this graph, x-axis: MAFv, y-axis: g/s:

check out those wavy oscillations...

It took about 7 reflashes and 30 good logs to dial in flat 11afrs, not to mention stupid tactrix disconnecting for no reason

(and ferrite chokes do not help on the usb cable, nor SSD disk where I heard it should help because it's not immune to g force as much as rotating disk)

At around 3.5MAFv APS 65mm flows less than stock by 4.1%

, which is where I had most problems, getting 9.9-10.3afr instead of 11.

APS vs stock flow (Ctrl +, enlarge that thing):

I have very slight exhaust leak in exh manifold, could that skew the readings wideband gets? Or does an exh leak before turbo work like $0.00 ewg?

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Black94Snake · 02-22-2013, 07:33 AM

You're trying to hard to get 0 trimming. Smooth out the curve and let your O2 sensors do their job.

nfm · 02-22-2013, 08:09 PM

Quote:

Originally Posted by Black94Snake

You're trying to hard to get 0 trimming. Smooth out the curve and let your O2 sensors do their job.

That is true for closed loop, at 3.5MAFv we're well into OL and boost where stock o2 is useless. Hmm and I say no to smoothing! The whole point was to show how wavy the flow is with this CAI, if I would to smooth that out I would be hitting 10afr instead of 11s.

Black94Snake · 02-22-2013, 10:08 PM

if you are hitting an AFR of 10, you dont know what you are doing.

Airboy · 02-22-2013, 11:39 PM

Are you scaling the MAF above 3V from full throttle runs only?

nfm · 02-23-2013, 01:48 PM

Quote:

Originally Posted by Airboy

Are you scaling the MAF above 3V from full throttle runs only?

Yes I use your spreadsheet to filter and get 'WOT only' samples.

Airboy · 02-23-2013, 06:19 PM

Quote:

Originally Posted by nfm

Yes I use your spreadsheet to filter and get 'WOT only' samples.

3.5v is around where turbo is spooling and boost/load is changing rapidly. Should collect data at part throttle so that boost/load is stable as MAF voltage sweep through the 3.5v area.

02-22-2013, 03:28 AM	#1
nfm Scooby Newbie Member#: 171697 Join Date: Feb 2008 Chapter/Region: MWSOC Location: Orland Park, IL Vehicle: 05 WRX EJ205 CGM VF48 20psi	APS 65mm nonuniform flow Just ranting here, scaling OL is getting on my nerves, take a look at this graph, x-axis: MAFv, y-axis: g/s: check out those wavy oscillations... It took about 7 reflashes and 30 good logs to dial in flat 11afrs, not to mention stupid tactrix disconnecting for no reason (and ferrite chokes do not help on the usb cable, nor SSD disk where I heard it should help because it's not immune to g force as much as rotating disk) At around 3.5MAFv APS 65mm flows less than stock by 4.1% , which is where I had most problems, getting 9.9-10.3afr instead of 11. APS vs stock flow (Ctrl +, enlarge that thing): I have very slight exhaust leak in exh manifold, could that skew the readings wideband gets? Or does an exh leak before turbo work like $0.00 ewg? * Registered users of the site do not see these ads.

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02-22-2013, 07:33 AM	#2
Black94Snake NASIOC Supporter Member#: 274499 Join Date: Feb 2011 Chapter/Region: NESIC Location: RI Vehicle: 2007 CGM VF'd WRX 12.9 @ 105mph	You're trying to hard to get 0 trimming. Smooth out the curve and let your O2 sensors do their job.

02-22-2013, 10:08 PM	#4
Black94Snake NASIOC Supporter Member#: 274499 Join Date: Feb 2011 Chapter/Region: NESIC Location: RI Vehicle: 2007 CGM VF'd WRX 12.9 @ 105mph	if you are hitting an AFR of 10, you dont know what you are doing.

02-22-2013, 11:39 PM	#5
Airboy Scooby Specialist Member#: 72829 Join Date: Oct 2004 Chapter/Region: W. Canada Location: Calgary, Canada Vehicle: 2006 HTA68'd wagon Powered by RomRaider	Are you scaling the MAF above 3V from full throttle runs only?