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Old 04-06-2016, 01:01 PM   #1
ChkOutMySubaru
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Default Fuel tuning advice for noob

I have an 03 wrx with XPT stage 2 gm bcs
K&N panel
Snorkus delete
AVO turbo inlet
Catless up pipe
Catless TBE
DW 200 fuel pump
ACT street light flywheel


I have been slowly learning tuning techniques and found success so far with dialing WGDC and target boost.

Anyhow..

My AFRs started getting wacky which lead me to replace my old fuel pump with a DW 200. Well, my mid range is now too rich 10.9-11, and redline is too lean 11.0-11.3. Target is mid to low 11's midrange, and 10.7-10.9 by redline.*

Any advice for a noob tuner on dialing in my fueling for the new pump?

By the way, my fuel pressure is good. Should I start my tuning by adjusting the injector duty cycle?
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Last edited by ChkOutMySubaru; 04-06-2016 at 02:20 PM.
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Old 04-08-2016, 08:01 AM   #2
quazimoto
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I would start by cleaning the MAF and resetting the ECU to clear the fuel trims. Then recheck the AFR after the fuel trims settle. Then if the AFR's are still out of whack start making adjustments.
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Old 04-10-2016, 10:17 PM   #3
ChkOutMySubaru
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Thanks for the reply. I cleaned my MAF and replaced my front o2.

It helped a bit but I'm seeing 15 IAM and FLKC in a couple cells with AFRs running 10.9-11.1 WOT all the way to redline. My wideband isn't wired for logging yet.

LTV before and after datalog. 3rd gear pull with slight incline.
https://www.dropbox.com/sh/1nej92ilc33vd9w/AADinv71-s_28uCSJn-2sLlba?dl=0
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Old 04-10-2016, 10:22 PM   #4
ChkOutMySubaru
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By the way.

For ****sngiggles I tried 2 new MAFs off the self (I work at a parts store and both of them made my car run pig rich, 10 flat AFR WOT to redline, although boost was holding 17 solid (with my MAF I barely graze 17 and hold 16 solid). The car felt slower and a little jerky as well.

My LTV afterwards showed an IAM of 16 with zero FLKC. A datalog of one of the new MAFs showed the peak MAF g/s at 6500rpm to hit 247 g/s! Doesn't that seem quite a bit high?? My MAF only hits around 215-220.
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Old 04-11-2016, 06:55 AM   #5
quazimoto
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Are these Denso MAF's?
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Old 04-11-2016, 04:04 PM   #6
ChkOutMySubaru
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Quote:
Originally Posted by quazimoto View Post
Are these Denso MAF's?
The one I started with is a reman Denso. The others are reman AutoZone MAFs. I just installed another and my butt dyno felt a big difference. My AFRs looked to be a small amount more rich in the top end and my boost was spot on.

I went to do a datalog and pull an LTV and....my girlfriend didn't plug my laptop in!!!! It was dead

I'll report back tonight after I charge it back up.
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Old 04-11-2016, 09:26 PM   #7
ChkOutMySubaru
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Well, the new MAF didn't change a thing. It actually made my car drop it's IAM to 11 :/ Watching my wideband I saw my AFRs running around 11.2-11.3 by redline. I just replaced my fuel filter a month ago, but maybe the element inside is loose. I don't know what else to check, other than my injectors. Any advice is greatly appreciated fellas. I'm really getting fed up with this.

Here's the datalog and LTVs before and after the pull, with the new MAF

https://www.dropbox.com/sh/6ry3sddjs5abbwy/AAC_-o57dQyG4rDsntnGbhcWa?dl=0
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Old 04-11-2016, 11:02 PM   #8
ChkOutMySubaru
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After taking a peek at my latest datalog, I noticed the rpm was not consistent all the way through.

For example, it reads,
Rpm
2427
2509
2509
2483
2546
2546
2497
2547

Is that normal?
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Old 04-12-2016, 10:12 AM   #9
quazimoto
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Quote:
Originally Posted by ChkOutMySubaru View Post
After taking a peek at my latest datalog, I noticed the rpm was not consistent all the way through.

For example, it reads,
Rpm
2427
2509
2509
2483
2546
2546
2497
2547

Is that normal?
Not really
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Old 04-12-2016, 10:19 AM   #10
quazimoto
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Quote:
Originally Posted by ChkOutMySubaru View Post
Well, the new MAF didn't change a thing. It actually made my car drop it's IAM to 11 :/ Watching my wideband I saw my AFRs running around 11.2-11.3 by redline. I just replaced my fuel filter a month ago, but maybe the element inside is loose. I don't know what else to check, other than my injectors. Any advice is greatly appreciated fellas. I'm really getting fed up with this.

Here's the datalog and LTVs before and after the pull, with the new MAF

https://www.dropbox.com/sh/6ry3sddjs...ntnGbhcWa?dl=0
Spool seems a bit late for a 3 port BCS. Max boost was only 15 psi. MAF g/s was a little low. I would check for a preturbo exhaust leak.
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Old 04-12-2016, 10:33 AM   #11
ChkOutMySubaru
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OK, I'll check for leaks again on my lunch break and report back. I'm also going to switch back to my original Denso remanned MAF.
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Old 04-12-2016, 12:10 PM   #12
ChkOutMySubaru
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I just went out and sprayed soapy water on the pre-turbo exhaust joints and found no leaks. I also ran my fingers around the joints and found no leaks. Only thing I noticed was my wastegate shaft was leaking a little bit. I had an up pipe leak last month (squirrel screech sound) but I removed everything pre-turbo, cleaned and reused the gaskets (I installed them new OEM from Subaru last year) and tightened everything up starting with the manifolds and working up to the turbo. The noise went away.

I also sprayed everything I could between the maf and manifold with soapy water and brake clean, which yielded no traceable leaks.
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Old 04-12-2016, 12:28 PM   #13
ChkOutMySubaru
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Just checked fuel pressure. 35psi idle, 43psi off vacuum. 60psi at 16psi boost.

Pressure gauge has held 43psi for 5 mins without dropping. Needless to say it sprayed out pretty good when I relieved the pressure. But, this morning when the car was fairly cold, I pulled the fuel line within seconds of shutting the car off, almost no pressure.

Last edited by ChkOutMySubaru; 04-12-2016 at 03:00 PM.
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Old 04-13-2016, 10:50 PM   #14
ChkOutMySubaru
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So, yesterday I pulled my injectors and cleaned them with b12 carb cleaner. I rigged up a hose and clamped it to the injectors, one by one, and powered them with my car battery by rapidly touching the alligator clip to the positive. I then reinstalled the injectors with new o-rings and grommets. I took the car for a spin and my AFRs are running low 11's mid range and high 10's by redline.

Boost is low but I can't find any leaks.
IAM is at 16 with knock correction in two cells.

Here is a data log and 3 LTVs.
First LTV is before logging. Second LTV is after my first pull that didn't save. Third LTV is after my final pull that I have data logged.

https://www.dropbox.com/sh/256ikw6d9...6tVxkb-9a?dl=0

Last edited by ChkOutMySubaru; 04-13-2016 at 11:16 PM.
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Old 04-14-2016, 10:21 AM   #15
ChkOutMySubaru
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Cold morning today. AFRs running in the high to mid 10's all the way to redline. Boost hitting 15psi. One pull randomly spiked to 18psi and immediately kicked back down to 15psi. It consistently hit 15psi the rest of the way to work. I checked my IAM when I stopped for coffee and now it's at 12.
I'm beginning to suspect something mechanical is creating false knock. After checking everything I found my wastegate flapper to be quite noisy. When wiggled it sounds like dog tags or a little bell. I compared it to a spare TD04 I have, and the wastegate on the spare is MUCH quieter. I searched Google for "WRX wastegate noise and FBKC" and found a thread on RomRaider. Here is a quote from that thread.

"Matt (throttlehappy) kindly suggested and shared his previous experience with the subaru knock sensors picking up mechanical noise, or more accurately metal to metal pinging from the wastegate which isn't exhaust note."

Any thoughts?

Last edited by ChkOutMySubaru; 04-14-2016 at 11:11 AM.
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Old 07-30-2018, 02:42 PM   #16
contaminatrix
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45A, originally 18L

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Quote:
Originally Posted by ChkOutMySubaru View Post
After taking a peek at my latest datalog, I noticed the rpm was not consistent all the way through.

For example, it reads,
Rpm
2427
2509
2509
2483
2546
2546
2497
2547

Is that normal?
i wish you found what caused this. i have the same problem especially between 4k-5k rpms. I'm on speed density though and I don't use a maf.
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Old 08-13-2018, 12:36 AM   #17
Nettalp
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Platinum Silver Metallic

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What's your timing look like?
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