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09-29-2009, 12:20 PM | #26 | |
Scooby Newbie
Member#: 151260
Join Date: Jun 2007
Chapter/Region:
SCIC
Location: San Diego, CA
Vehicle:2011 BMW 135i __________ |
Quote:
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10-05-2009, 11:19 PM | #27 |
Scooby Newbie
Member#: 110150
Join Date: Mar 2006
Chapter/Region:
RMIC
Location: Ogden, UT
Vehicle:1995 Impreza L'RX White |
I have blow thru on my car it was bugger to get to idle at first. However when I did my swap I changed too many things all at once so i have struggled with tuning a blow thru, modded injectors, bigger turbo, and fMIC, tumbler deletes all at once. It is a work in progress.
http://www.sebaru.net Seb |
12-09-2009, 10:17 PM | #28 |
Scooby Specialist
Member#: 198522
Join Date: Dec 2008
Chapter/Region:
Tri-State
Location: Up State NY
Vehicle:00 LGT -> WRX swap White Birch |
bump anymore info on this subject?
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12-10-2009, 06:51 AM | #29 |
Scooby Specialist
Member#: 174442
Join Date: Mar 2008
Chapter/Region:
Tri-State
Location: NNJ
Vehicle:2007 SuperWagon I don't spell well |
I've been working with OS blow-thru and it's been much better for me than draw thru. In my experience, the car runs smoother with much less learned afr corrections. I've had no problems what so ever with it.
I think those that do have trouble with it just forget to delete the PCV valve and have an air leak in that location not knowing it. |
12-23-2009, 10:52 AM | #30 |
*** Banned ***
Member#: 85813
Join Date: Apr 2005
Chapter/Region:
South East
Location: Myrtle Beach, SC
Vehicle:2002 E46 M3 2006 RC51 |
My blow thru tuned just fine. Tuners don't like them because they are lazy. Most tuners have base maps for draw through and have very little tuning to do on typical setups.
It's a little harder initially but once you get the curve the way you want it it's stupid easy to make changes. My tuner took a little while initially but once he got the curve flattened and tweaked we started making very fast progress. |
12-27-2009, 10:15 AM | #31 |
Scooby Specialist
Member#: 198522
Join Date: Dec 2008
Chapter/Region:
Tri-State
Location: Up State NY
Vehicle:00 LGT -> WRX swap White Birch |
well thats good to hear thanks guys
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12-27-2009, 02:27 PM | #32 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
Is anyone running a GT30-sized turbo with blow-through and a 3" MAF housing?
I'm going to switch to blow-through for my ATP 3076, I have 3" and 3.5" tubing available, and I don't want to go with 3.5" if 3" will suffice. Thanks! |
12-27-2009, 04:04 PM | #33 |
*** Banned ***
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Join Date: Apr 2005
Chapter/Region:
South East
Location: Myrtle Beach, SC
Vehicle:2002 E46 M3 2006 RC51 |
I'm running a 70mm (smaller than 3") blow thru on my GT35R. My MAF maxed out but I'm on the 2.0L ECU which cannot read as high as the 2.5L ECU's can.
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12-27-2009, 04:21 PM | #34 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
The older ECUs have a limit on the airflow they'll understand (I think it's 300 g/s or something like that) but the thing that interests me the most is whether the MAF voltage maxed out in your setup. Do you have any data logs that show the MAF voltage?
How did your tuner get around the MAF being maxed out? It's common to just redo the MAF sensor scaling so that the ECU only "sees" half of the actual airflow, and then rescale the injectors so the ECU only "requests" half as much as they actually flow, so you end up with proper AFRs in the end. If your tuner took that approach and got your car working well with a sub-3" blow-through then I may just stick with a 3" tube... I get the impression there have been different sensors used in different years though - does yours look like this? [click here] Thanks! |
12-27-2009, 05:50 PM | #35 | |
*** Banned ***
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Chapter/Region:
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Location: Myrtle Beach, SC
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Quote:
My MAF was rescaled. I have more headroom but not a whole lot more. I'm boosting 22 psi on my hybrid and making 424 hp on a Mustang dyno. Tq is 415. Timing is super conservative at 16 at redline on methanol injection. Spring time we are bumping up everything. We wanted to keep it conservative since the new motor only had 500 miles on it. |
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01-01-2010, 07:57 PM | #36 |
Scooby Newbie
Member#: 100137
Join Date: Nov 2005
Chapter/Region:
E. Canada
Location: Chicoutimi, Canada
Vehicle:2000 Impreza RS Blue |
Keep in mind that the charge tends to carry oil particles and/or fumes from the turbo compressor or vent breather (depending of your setup). In order to keep an accurate reading you will have to clean your MAF at least once a month, if not once a week. Also, oil will permanently stain the red hot element after a while so you will have to replace it eventually.
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01-01-2010, 08:49 PM | #37 | |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
Quote:
This is the first I've heard of short-lived sensors like that. |
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01-01-2010, 10:12 PM | #38 |
Scooby Newbie
Member#: 100137
Join Date: Nov 2005
Chapter/Region:
E. Canada
Location: Chicoutimi, Canada
Vehicle:2000 Impreza RS Blue |
I haven't go blow-thru on a subaru but I did it on several car such as Suzukis, LS1 engines etc.
Beside, electronics are pretty much the same so it doesn't really matter. I'm not saying that their life will be shortened, but rather that they'll lose accuracy over time. |
01-02-2010, 09:47 AM | #39 |
Scooby Newbie
Member#: 195982
Join Date: Nov 2008
Vehicle:2002 WRX white |
I wish cobb would come out with SD maps and tuning support for 16 bit ecu's
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01-02-2010, 10:34 AM | #40 |
*** Banned ***
Member#: 85813
Join Date: Apr 2005
Chapter/Region:
South East
Location: Myrtle Beach, SC
Vehicle:2002 E46 M3 2006 RC51 |
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01-02-2010, 12:13 PM | #41 | |
Scooby Newbie
Member#: 120187
Join Date: Jul 2006
Chapter/Region:
South East
Location: Fort Walton Beach, FL
Vehicle:2005 STI Blouch Dom Obsidian Black Pearl |
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01-02-2010, 12:48 PM | #42 | |
*** Banned ***
Member#: 85813
Join Date: Apr 2005
Chapter/Region:
South East
Location: Myrtle Beach, SC
Vehicle:2002 E46 M3 2006 RC51 |
Quote:
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01-02-2010, 03:13 PM | #43 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
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01-03-2010, 03:05 AM | #44 |
Scooby Newbie
Member#: 120187
Join Date: Jul 2006
Chapter/Region:
South East
Location: Fort Walton Beach, FL
Vehicle:2005 STI Blouch Dom Obsidian Black Pearl |
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01-03-2010, 03:37 AM | #45 |
Scooby Guru
Member#: 140444
Join Date: Feb 2007
Chapter/Region:
NWIC
Location: Near Seattle, WA
Vehicle:05 Stage Free LGT ATP 3076, 6MT, AVO FMIC |
Cool, good to know. I have some questions, if you don't mind...
What turbo? What diameter is the tubing at the MAF sensor? How many grams per second is your MAF reading? And how many volts? I'm trying to figure whether I need 3" or 3.5" tubing. Thanks! |
01-03-2010, 10:37 AM | #46 |
Scooby Newbie
Member#: 195982
Join Date: Nov 2008
Vehicle:2002 WRX white |
Why not? I feel like OS is kind of primitive compared to the many features that AP has, and Cobbs software seams much easier to use. Is there any way to use a sort of hybrid setup of AP and OS?
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01-03-2010, 01:40 PM | #47 |
*** Banned ***
Member#: 85813
Join Date: Apr 2005
Chapter/Region:
South East
Location: Myrtle Beach, SC
Vehicle:2002 E46 M3 2006 RC51 |
They haven't released it for the STi yet. It's still in beta. Too much development and time involved and the 16Bit ecu no longer exists in newer cars.
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01-04-2010, 06:13 PM | #48 | |
Scooby Newbie
Member#: 120187
Join Date: Jul 2006
Chapter/Region:
South East
Location: Fort Walton Beach, FL
Vehicle:2005 STI Blouch Dom Obsidian Black Pearl |
Quote:
I forgot the dimensions of the Perrin tube. Here is my MAF scaling, the most I've pulled is 320 g/s or so @ 11.0 AFR. Code:
0.94 0.98 1.02 1.05 1.09 1.13 1.17 1.21 1.25 1.29 1.33 1.37 1.41 1.48 1.56 1.64 1.72 1.80 1.88 1.95 2.03 2.11 2.19 2.27 2.34 2.42 2.54 2.66 2.77 2.89 3.01 3.13 3.24 3.36 3.48 3.59 3.71 3.83 3.95 4.06 4.18 4.30 4.41 4.49 4.57 4.61 4.65 4.69 4.73 4.77 4.80 4.84 4.88 4.92 2.78 3.16 3.42 3.82 4.21 4.61 5.05 5.56 5.94 6.49 6.98 7.55 8.16 9.83 11.71 13.70 15.75 18.24 21.01 24.27 26.24 30.48 34.17 38.39 43.99 47.32 56.64 61.92 72.01 82.74 94.32 106.83 120.41 135.15 151.16 168.48 187.06 207.32 229.49 254.45 281.01 308.22 336.10 355.13 375.87 386.85 398.07 410.03 422.88 436.79 448.10 463.61 479.59 495.43 |
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02-15-2010, 03:03 PM | #49 |
Scooby Specialist
Member#: 190003
Join Date: Sep 2008
Chapter/Region:
NWIC
Location: Spokane WA
Vehicle:2007 STI White |
I built a 72~ or so mm MAF draw through tube for my ATP 30r.. and it pegged out with the stock TMIC. That was with 28-30 psi with around zero degrees air.
In the summer with 60-70 degree intake temps it wouldn't go past 4.88 volts; I bet it's even worse now that I have a HUGE front mount. I'll be moving the MAF flange to a bigger tube (3.25 inch??) blow through here today when I borrow my buddys tig welder.. and we'll see what happens. |
02-15-2010, 03:28 PM | #50 |
*** Banned ***
Member#: 85813
Join Date: Apr 2005
Chapter/Region:
South East
Location: Myrtle Beach, SC
Vehicle:2002 E46 M3 2006 RC51 |
Blow thru was very inconsistant on my car. Draw thru not only made more power but stayed consistant.
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