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Old 09-27-2012, 03:10 PM   #26
OC_Nooby
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So I can keep the o2 plugged in but run OL all the time? How abouts do I run OL all the time? I have a wideband and look at it like its a religion.

Thanks!

Also I've been reading your post about running the car without one for 2 years plus
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Old 09-27-2012, 03:25 PM   #27
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Would I set the "Minimum Active primary Open Loop Enrichment" to 14.7 (max possible, currently at 14.41) and set my OL table to 14.65?

That way it checks the table compares with my limit and says OL all the time?
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Old 09-27-2012, 05:17 PM   #28
the suicidal eggroll
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That's correct. You can actually set the minimum active primary OL map enrichment above 14.7, but there's a check in the ECU where if the OL fueling cell is set to 14.7, it will run closed loop regardless of the MAPOLME value. So you just lower the stoich target slightly (14.6 or something) and then you're set.
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Old 09-27-2012, 06:59 PM   #29
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Well, my A/F in some places is good, in others its crap, still have the hesitation when I go partial throttle.

Its amazing how off a tune can be when your just in OL (no correction from the o2). I need to buy myself a stock MAF housing/filter then scale my injectors. Then put back my K&N Typhoon and finally once my injectors are scaled put back my Typhoon and scale the MAF.
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Old 09-27-2012, 07:08 PM   #30
the suicidal eggroll
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Quote:
Originally Posted by OC_Nooby View Post
Its amazing how off a tune can be when your just in OL (no correction from the o2).
It really is, it can be surprising when you first do it. The closed loop system covers up so much that you simply can't fix the problems because you don't even know they exist. It doesn't cover them up perfectly though, so these problems can lead to some weird driveability issues that end up being very difficult to identify.

Switching to OL brings ALL of these problems right into the light of day, which 1) can make the car run like crap if there are a lot of them, but 2) makes the problems easy to identify and fix. After they're fixed, you can turn the closed loop system back on without it causing any more problems.
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Old 09-27-2012, 07:20 PM   #31
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Originally Posted by the suicidal eggroll View Post
It really is, it can be surprising when you first do it. The closed loop system covers up so much that you simply can't fix the problems because you don't even know they exist. It doesn't cover them up perfectly though, so these problems can lead to some weird driveability issues that end up being very difficult to identify.

Switching to OL brings ALL of these problems right into the light of day, which 1) can make the car run like crap if there are a lot of them, but 2) makes the problems easy to identify and fix. After they're fixed, you can turn the closed loop system back on without it causing any more problems.
Yup,

It freaking weird though. I doubt that my MAF scaling will fix this issue though as its only present in one area. I did exert a lot of possibilities though without any really fixes. So I have to try this out.

For example. My car was idling at 14.9-15 A/F (for a solid 5 minutes) so I checked out what voltage/g the MAF is producing and I decided I will fix this via MAF scale. Before I flashed the ECU I decided to turn of the car and start her right back up. Fired it up and it was idling at 12 A/F. I NEEED CONSISTENCY DAMMIT!!!

MAF Scaling
Injector Scaling
Injector Latency

I has to perfect that...
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Old 09-28-2012, 02:02 PM   #32
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the suicidal eggroll,

I was thinking, even though I'm am not using the stock boost controller I still have the stock parameters for:

Boost Control - Target
Boost Control - Limits
Boost Control - Wastegate
Boost Control - Turbo Dynamics

I did change the Boost Limit Fuel Cut and Boost Limit (CEL). I was reading but didn't see anything else affecting fuel or air but maybe a parameter in here is playing nasty tricks on me and causing my lean spike at partial throttle.

I think you suggested something to me about this a while back but I figured since i'm not using the stock boost controller and only running wastegate that I shouldn't have an issue/ I have no clue what table to look at but i'm trying to figure this out as we speak.
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Old 09-28-2012, 03:48 PM   #33
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If you're not using the ECU boost control system, you just want to make sure that any tables that depend on boost error are zero'd out. They already were in my stock 05 ROM, but I'm not sure about other years.
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Old 09-28-2012, 04:51 PM   #34
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Ok well there was 3 tables. One of the tables was already zero'd out.

Turbo Dynamic Burst Activation (Boost Error)
Turbo Dynamic Continuous Activation Threshold (Boost Error)
Tip-In Enrichment Compensation (Positive Boost Error) - This was zero'd out.
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Old 09-28-2012, 08:21 PM   #35
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Well tried that along with something else no go. I believe its a MAF scaling issue. I also just got P0340 cam sensor malfunction. That's what I get for using used ones from the junkyard ftl. Who knows maybe its affecting me a tad as well.
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Old 10-04-2012, 06:48 PM   #36
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Ok, update. So I got a stock airbox finally.

Now do I use a WRX MAF scale or an STI MAF scale? (MAF sensor is from an 03 WRX but motor is a 2.5L sti)

I know the MAF sensor is the same from 02-07 as well as the stock airbox so why the difference? Id say more difference in CL then OL.

Next question would be, would I run the car without the o2 sensor and scale my injector until I'm hitting all my OL fueling map points?

Last edited by OC_Nooby; 10-05-2012 at 12:14 PM.
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Old 10-05-2012, 01:21 PM   #37
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Quote:
Originally Posted by OC_Nooby View Post
I know the MAF sensor is the same from 02-07 as well as the stock airbox so why the difference? Id say more difference in CL then OL.

Next question would be, would I run the car without the o2 sensor and scale my injector until I'm hitting all my OL fueling map points?
1. Different injectors, intercoolers, and the like. So to compensate they are scaled different from the factory

2. More or less yes. Not 100% how I do it, but others do it with sucess.
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Old 10-05-2012, 11:28 PM   #38
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Quote:
Originally Posted by OC_Nooby View Post
Ok, update. So I got a stock airbox finally.

Now do I use a WRX MAF scale or an STI MAF scale? (MAF sensor is from an 03 WRX but motor is a 2.5L sti)

I know the MAF sensor is the same from 02-07 as well as the stock airbox so why the difference? Id say more difference in CL then OL.

Next question would be, would I run the car without the o2 sensor and scale my injector until I'm hitting all my OL fueling map points?
What's the MAF sitting in? If it's in a stock WRX intake, then use the scaling from that WRX.

I disable closed-loop and scale the MAF for idle, cruise, mild acceleration, and wastegate boost, usually in that order. Then I turn up the boost a couple psi at a time.

It's important to check low-load AFR errors at low boost and wastegate boost periodically as you're turning up the boost, and after you've got full boost working well. You may run into issues where the same MAFv has different AFR errors at different RPM, due to quirks of the fuel injectors and/or fuel rails. The "Engine Load Compensation (MP)" table can be used to dial those out.
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Old 10-06-2012, 01:43 AM   #39
OC_Nooby
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Quote:
Originally Posted by NSFW View Post
What's the MAF sitting in? If it's in a stock WRX intake, then use the scaling from that WRX.

I disable closed-loop and scale the MAF for idle, cruise, mild acceleration, and wastegate boost, usually in that order. Then I turn up the boost a couple psi at a time.

It's important to check low-load AFR errors at low boost and wastegate boost periodically as you're turning up the boost, and after you've got full boost working well. You may run into issues where the same MAFv has different AFR errors at different RPM, due to quirks of the fuel injectors and/or fuel rails. The "Engine Load Compensation (MP)" table can be used to dial those out.
Currently suffering from other weird idle issues (made a new thread), I think its injector related. Thanks for the tips, will try them out as soon as I figure out why my idle is wonky at times.

Last edited by OC_Nooby; 10-06-2012 at 01:50 AM.
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