bdickey058 Posted January 28, 2009 Share Posted January 28, 2009 Has anyone actually blew up there car or did messed it up by having one? I mean all these people talk trash about it but i have not seen proof. I guess i just dont understand. Our cars should adjust to more or less air. Hell the compute rknows when we are at different altitudes Link to comment Share on other sites More sharing options...
LGT Dave Posted January 28, 2009 Share Posted January 28, 2009 Has anyone actually blew up there car or did messed it up by having one? I mean all these people talk trash about it but i have not seen proof. I guess i just dont understand. Our cars should adjust to more or less air. Hell the compute rknows when we are at different altitudes The problem isn't that the ECU can't adjust for the intake, but that the amount of air going into the engine can be different from how much the ECU thinks is there. An intake can end up placing the MAF sensor in a different place in the air stream than the stock location and can cause more turbulence as well making the MAF readings even more inaccurate. If the MAF isn't rescaled manually then the ECU still thinks everything is stock and adjusts things like fuel and timing according to how much air it thinks it's seeing. So basically, you end up with more air than the ECU thinks and that can result in a lean condition which can cause damage due to knock over time. Link to comment Share on other sites More sharing options...
c-lo Posted January 28, 2009 Share Posted January 28, 2009 why not post this in your other thread??:confused: http://legacygt.com/forums/showthread.php?t=104305 258k miles - Stock engine/minor suspension upgrades/original shocks/rear struts replaced at 222k/4 passenger side wheel bearings/3 clutches/1 radiator/3 turbos Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 28, 2009 Share Posted January 28, 2009 It's called running lean brother. Read about Air Fuel Ratio then come back and post. Link to comment Share on other sites More sharing options...
kevkel33leg05 Posted January 28, 2009 Share Posted January 28, 2009 Hey i wrote this in another thread. All your sensors work off of 5.0volts max. Each 0.1 volt equals an amount of airflow. so say your stock airbox is at 4.4 volts at WOT. Np at all. Now when you put on a bigger intake with cobb ots maps or even a stock map and start taken in more air you face the chance of maxing out that 5.0 volt range. Example you could be bringin in 5.3 volts with a bigger intake but the maf cant read that. So it will only give you the fuel for 4.9 volts. Causeing a lean condition. Which in the worst case scenario could casue engine damage. When you get a map for your intake they change the values of each 0.1V so you wont max it out. Hope that helps/makes sence... Link to comment Share on other sites More sharing options...
rao Posted January 28, 2009 Share Posted January 28, 2009 Hey i wrote this in another thread. All your sensors work off of 5.0volts max. Each 0.1 volt equals an amount of airflow. so say your stock airbox is at 4.4 volts at WOT. Np at all. Now when you put on a bigger intake with cobb ots maps or even a stock map and start taken in more air you face the chance of maxing out that 5.0 volt range. Example you could be bringin in 5.3 volts with a bigger intake but the maf cant read that. So it will only give you the fuel for 4.9 volts. Causeing a lean condition. Which in the worst case scenario could casue engine damage. When you get a map for your intake they change the values of each 0.1V so you wont max it out. Hope that helps/makes sence... That's not what happens (well that is what happens if you install the sensor in a larger diameter housing. The MAF sensor works by exposing a heated wire to the air stream and using the amount that the wire cools to calculate the amount of air (actually the mass of the air ) that is passing over the wire. The issue is that the Legacy's MAF (and most MAFs) only measure the airflow over a very small portion of the intake tube. When you change the rest of the intake the airflow pattern in the tube can change, throwing off the sample that the MAF sees. It is usually worse at low flow rates, since there is more variability in how air flows through the tube when there is less of it then when you are running WOT at full load. The result of all of this is that when you change things, the MAF sends a signal to the ECU that the mass of air is one amount when in fact it is another. This is pretty easy to fix when you are setting up the tune. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
kevkel33leg05 Posted January 28, 2009 Share Posted January 28, 2009 When you say "larger diameter housing" are you referring to the diameter of the tube/pipe? I'm just asking because aren't most intakes larger in diameter then the stock one making that apply. Thanks Link to comment Share on other sites More sharing options...
rao Posted January 28, 2009 Share Posted January 28, 2009 Yes, I was referring to the "BIG MAF" kits - when you run over the capacity of the MAF, if you p ut it into a larger tube you can, and must, rescale it since the sample is taken from a much larger overall area. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 28, 2009 Share Posted January 28, 2009 How would one go about rescaling the MAF sensor? Does this apply to the AEM CAI as well? Thanks. Link to comment Share on other sites More sharing options...
rao Posted January 28, 2009 Share Posted January 28, 2009 This applies to all intakes, at least until you log it to see if it doesn't The COBB Street tuner instructions explain it very well. It is not that hard and takes only a few minutes. http://www.cobbforums.com/forums/showthread.php?t=31091 You folks shouldn't be messing with any of this until you have read and understand their stuff - and it is all free Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
GTTuner Posted January 28, 2009 Share Posted January 28, 2009 I ran a Typhoon for 7000 miles on a stock tune, MBC, running 15psi, 93 oct gas. It never hurt my car. Link to comment Share on other sites More sharing options...
kevkel33leg05 Posted January 28, 2009 Share Posted January 28, 2009 That's not what happens (well that is what happens if you install the sensor in a larger diameter housing. Isnt that what your doing when you put on a bigger intake? pretty sure the K&N doesnt affect anything on a stock car stock tune. Feel free to correct me though. Link to comment Share on other sites More sharing options...
bdickey058 Posted January 28, 2009 Author Share Posted January 28, 2009 first off i didnt post in the other thread b/c noone really said anything in it, and this one seems to be getting a lot of replys. But i'm very interested in this stuff. eventhough i'm new to cars and dont understand a lot. But i'm willing to learn! Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 28, 2009 Share Posted January 28, 2009 Read up n00b http://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4GGIH_enUS259US259&q=air+fuel+ratio Link to comment Share on other sites More sharing options...
bdickey058 Posted January 28, 2009 Author Share Posted January 28, 2009 Thanks lgt! still want a intake for the sound lol. maybe a bov will do the same thing!!!! Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 28, 2009 Share Posted January 28, 2009 If the sound is what you desire, search the "intake silencer delete" mod. Cheap and easy way to get that blow off sound. Link to comment Share on other sites More sharing options...
bdickey058 Posted January 28, 2009 Author Share Posted January 28, 2009 How loud is it? will it even be louder with a perrin or avo air filter? Link to comment Share on other sites More sharing options...
goneskiian Posted January 29, 2009 Share Posted January 29, 2009 Yes. Just adding a high flow panel filter will increase the intake sounds. I haven't done the silencer removal but I bet that would really make it quite noticeable. Link to comment Share on other sites More sharing options...
bdickey058 Posted January 29, 2009 Author Share Posted January 29, 2009 alright, i wish i could find the intake silencer removal thread but for some reason when i search for it it wont show up!!! Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 29, 2009 Share Posted January 29, 2009 Gimme a sec. Link to comment Share on other sites More sharing options...
bdickey058 Posted January 30, 2009 Author Share Posted January 30, 2009 10-4 over Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 30, 2009 Share Posted January 30, 2009 Sorry forgot about ya. Here ya go: http://www.legacygt.com/forums/showthread.php?t=84688 Link to comment Share on other sites More sharing options...
itsme Posted January 30, 2009 Share Posted January 30, 2009 How would one go about rescaling the MAF sensor? Does this apply to the AEM CAI as well? Thanks. You can use romraider if you open source tune. You could copy your rom with ECUfash then use romraider to scale maf and update rom. Then flash the update. Racer X FMIC for '05-'09 LGTs, '08+ WRX and '10+ LGT,'14+ FXT, and '15+ WRX TMIC Racerxengineering.com Link to comment Share on other sites More sharing options...
Guest LGT-NY Posted January 30, 2009 Share Posted January 30, 2009 I have an AP protune so I assume this is something my tuner has already adjusted and/or rescaled. Thanks for the info though. Link to comment Share on other sites More sharing options...
itsme Posted January 30, 2009 Share Posted January 30, 2009 I have an AP protune so I assume this is something my tuner has already adjusted and/or rescaled. Thanks for the info though. Did you read my signature. Log your car and you will know for sure. Racer X FMIC for '05-'09 LGTs, '08+ WRX and '10+ LGT,'14+ FXT, and '15+ WRX TMIC Racerxengineering.com Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.