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Scooby Specialist
Member#: 218997 Join Date: Jul 2009 Chapter/Region: South East Location: Jax Vehicle: 07 WRX Mikey Tuned | I hate being a complete newbe with bumb questions but I have to start somewhere. so here goes, What's does a 3 or 4 bar map sensor do for you ? |
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| | #2 |
Scooby Guru
Member#: 81102 Join Date: Feb 2005 Chapter/Region: South East Location: Micro aggression turnt | allows u to run more boost than the stock map sensor's limits max on stock is mid 20's boost, the 4 bar is 4 x 14.7, so ~58 psi max just fyi everyone, its ok to ask questions, on some subjects we are figuring new stuff out all the time and often misinformation is dispelled from these discussions. carmi edit: found a writeup that might explain some stuff, or u might already know it, but here it is again w/ pics. Quote: Originally Posted by kmook Hi, I jumped on the Cobb SD day one and wanted to share some info and pictures to help others. Review: So far I am super impressed by it. I am running my STI in full SD mode and completely removed the MAF. (Note you can keep the MAF and use it as your IAT sensor, but I'd rather get rid of that thing!) I wired in a GM IAT sensor and GM 3bar MAP sensor removing the stock MAP sensor on the throttle body as well. It is awesome to not have a MAF anymore. I am now also able to run a shortram intake right off my rotated turbo (basically a short piece of pipe with a nipple for my AOS). Also since there is no MAF I can run a super light spring in my Tial BOV (I went from the pink spring to the black spring lol) and have no flutter/surge under low boost shifting now. Parts: The parts I used are the following, I prefer to use the GM sensors as they are good products and a great price: GM IAT w/ Pigtail = //www.diyautotune.com/catalog/g...tail-p-62.html $22.25 Wiring: After clipping the stock MAP sensor off connect the stock harness wires to the GM pigtail as follows: GM 3Bar Letter /
3Bar Wire Color / Type / Stock Wire Color After clipping the stock MAF sensor off connect the stock harness wires to the GM pigtail as follows: GM IAT Wire Color / Stock MAF Wire Color Pics: GM 3bar MAP and GM IAT GM 3bar MAP Installed GM IAT Installed New
Streamlined Engine Bay Last edited by CatfaceType-R; 05-13-2012 at 09:06 AM. |
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| | #3 |
Scooby Specialist
Member#: 218997 Join Date: Jul 2009 Chapter/Region: South East Location: Jax Vehicle: 07 WRX Mikey Tuned | Thanks, That's a big help ! |
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| | #4 |
Scooby Guru
Member#: 99442 Join Date: Oct 2005 Chapter/Region: International Location: Man of Mystery Vehicle: 2006 SGM STI | nice work. i have the omni 4bar sensor. I on going to run speed density with my new motor build. I have a brand new 3 bar sensor if you are interested. //www.innovatemotorsports.com/x...cat=265&page=1 |
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| | #5 |
Scooby Specialist
Member#: 291214 Join Date: Aug 2011 Chapter/Region: RMIC Location: Vancouver Washington Vehicle: 2011 STI Sedan | Some people run hybrid tunes.....MAF for low speed driveability and then speed density for power..... |
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| | #6 |
Scooby Guru
Member#: 99442 Join Date: Oct 2005 Chapter/Region: International Location: Man of Mystery Vehicle: 2006 SGM STI | what are low speed drivability probloems with speed density? |
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| | #7 |
Scooby Specialist
Member#: 183634 Join Date: Jul 2008 Chapter/Region: RMIC Location: At the "B" Vehicle: 02 wrx/ 92 ss | Ilde stability, fueling trims since intake temps usually increase at or during idle situations and the large manifold pressure changes (-)seem to make low rpm and idle a little more tying on SD |
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| | #8 |
Scooby Specialist
Member#: 78165 Join Date: Dec 2004 Chapter/Region: South East Location: SC Vehicle: 05 STI 35r + e85 | Quote: Originally Posted by soon2bblackongold max on stock is mid 20's boost, the 4 bar is 4 x 14.7, so ~58 psi max That's 58psi absolute or ~43psi relative pressure. Newer STI's have 3bar sensors from the factory - I believe the switch happened in 08. Prior to that they were ~2.5bar. |
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| | #9 |
Scooby Specialist
Member#: 218997 Join Date: Jul 2009 Chapter/Region: South East Location: Jax Vehicle: 07 WRX Mikey Tuned | So guys is it wise to switch over to a 3 bar ? I running a Spareco TM with a 73 Ktech intake with a stock intake manifold at 25lbs e85. Plus I guess it's a lot of trouble to tune for it ? |
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| | #10 |
Scooby Guru
Member#: 170602 Join Date: Jan 2008 Location: j-ville fl Vehicle: 06 Wrx RWD Auto | Easy for Mikey to tune for. IMO is a safety mod worth doing. Can log at higher boost pressures as well as maintain boost cut and other cool stuff even at high boost. |
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| | #11 |
Scooby Specialist
Member#: 232458 Join Date: Dec 2009 Chapter/Region: SWIC Location: Las Cruces/El Paso Vehicle: 2005 & 2008 STi | They're cheap, and I agree with the above. Being able to log 24.5+psi is good, being able to tune higher boost is good. It's future proofing your setup, and it's an investment that is well worth it. |
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| | #12 |
Scooby Specialist
Member#: 218997 Join Date: Jul 2009 Chapter/Region: South East Location: Jax Vehicle: 07 WRX Mikey Tuned | OK Thanks, One more question does it have to be tune if I install a 4 Bar MAP ? |
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| | #13 |
Scooby Guru
Member#: 51961 Join Date: Jan 2004 Chapter/Region: RMIC Location: Broomfield, CO Vehicle: 2005 STi | |
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| | #14 |
Scooby Specialist
Member#: 232458 Join Date: Dec 2009 Chapter/Region: SWIC Location: Las Cruces/El Paso Vehicle: 2005 & 2008 STi | Just scale the MAP sensor, takes 2 minutes to scale and flash. The scaling is posted here somewhere. |
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| | #15 |
Scooby Specialist
Member#: 49979 Join Date: Dec 2003 Chapter/Region: MAIC Location: MD, US Vehicle: 11 dgm wrx hatch | Quote: Originally Posted by jays05
That's 58psi absolute or ~43psi relative pressure. Newer STI's have 3bar sensors from the factory - I believe the switch happened in 08. Prior to that they were ~2.5bar. I had not read this anywhere- you certain they switched in '08? Three bar is good for ~2 x 14.7 at sea level so 29.4. Can you tell the 3 bar and 2.5 bar OEM sensors apart? Frank |
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| | #16 |
Scooby Specialist
Member#: 78165 Join Date: Dec 2004 Chapter/Region: South East Location: SC Vehicle: 05 STI 35r + e85 | Quote: Originally Posted by Frank A I had not read this anywhere- you certain they switched in '08? Three bar is good for ~2 x 14.7 at sea level so 29.4. Can you tell the 3 bar and 2.5 bar OEM sensors apart? Frank Here it is: Quote: Originally Posted by Phatron According to Ferdie at South Coast Subaru it is a direct bolt on for prior years |
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| | #17 |
Scooby Specialist
Member#: 232458 Join Date: Dec 2009 Chapter/Region: SWIC Location: Las Cruces/El Paso Vehicle: 2005 & 2008 STi | Last edited by wgr73; 05-16-2012 at 11:32 AM. |
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| | #18 |
Scooby Guru
Member#: 32669 Join Date: Feb 2003 Chapter/Region: SCIC Location: Woodland Hills Vehicle: 2007 2.34LR, EFR7670 | |
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| | #19 |
Scooby Guru
Member#: 159243 Join Date: Sep 2007 Chapter/Region: Tri-State Location: medford nj 08055 Vehicle: 5/01 bugeye | |
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| | #20 |
Scooby Newbie
Member#: 140335 Join Date: Feb 2007 Chapter/Region: PRSIC Location: PueRtO RicO Vehicle: 2003 03 WrX | Hey guys! sorry to revive this old thread but... I have a 2002 wrx and bought a 2010 map sensor so i can tune beyond the 23psi safely and i just wanted to know if by doing this mod i had to do a completely different scaling for this map sensor or i can use the one from the stock one? If so could somebody please give me the specs. |
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| | #21 |
Scooby Newbie
Member#: 144963 Join Date: Mar 2007 | Sorry to bump an old thread. I was wondering if anyone might have the dimensions of the stock map sensor handy from a 2.5 Turbo engine? More specifically, I'm looking for the mounting screw spacing, screw size (if you know it - not absolutely necessary), and the size of intake manifold orifice that the sensor fits into. Any help would be greatly appreciated. Thanks in advance! |
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