thorne Posted December 3, 2007 Report Share Posted December 3, 2007 I did not think this warranted a tech help section but I figured I would throw it out there. Is there a calculation to determine how much of a % differance it being cold will make on boost levels? I've got a MBC but I've not got it put on yet, So I'm still using the stock way of controlling boost "BLEED BLEED BLEED". I'm seeing max boost check engine lights (I set it at 21.5 psi just so i would know If I over boost. I figured someone on here would have some type of algorthym. (Cougar?) Quote Link to comment Share on other sites More sharing options...
RedRocket1647545505 Posted December 3, 2007 Report Share Posted December 3, 2007 If you have a good, properly working boost controller and wastegate, you shouldn't be overboosting. Superchargers overboost, turbos controlled by a wastegate should not. Quote Link to comment Share on other sites More sharing options...
ImUrOBGYN Posted December 3, 2007 Report Share Posted December 3, 2007 If A>B then C A = Boost level B = Boost cut C = Lower boost levels Quote Link to comment Share on other sites More sharing options...
thorne Posted December 3, 2007 Author Report Share Posted December 3, 2007 if your boost control system is based on a blled system it can make changed to quickly to compensate. I could tune it out but I was more on the lines seeing if there was a mmath way. It would be cake I could just remove some WGDC. I guesse I should just toss the halman on and call it a day. Quote Link to comment Share on other sites More sharing options...
SpaceGhost Posted December 3, 2007 Report Share Posted December 3, 2007 Thorne this is what is mostly used around the suby world for what you are talking about, it is $99 on Gruppe-s.com http://www.gruppe-s.com/Subaru/subeng/per_sol.jpg The other STI that was tuned right behind mine had this and his car could hold more boost longer than mine could. Quote Link to comment Share on other sites More sharing options...
schmuckingham Posted December 3, 2007 Report Share Posted December 3, 2007 If you have a good, properly working boost controller and wastegate, you shouldn't be overboosting. Superchargers overboost, turbos controlled by a wastegate should not. If superchargers overboost, then mine must be broken Quote Link to comment Share on other sites More sharing options...
thorne Posted December 3, 2007 Author Report Share Posted December 3, 2007 Superchargers can correct as well. they have a BOV type device. Quote Link to comment Share on other sites More sharing options...
RedRocket1647545505 Posted December 3, 2007 Report Share Posted December 3, 2007 If superchargers overboost, then mine must be broken Let me clarify. Centrifugal's usually overboost. Oh, and your's came from Ford, so it probably is broken. Sorry bout your luck. Quote Link to comment Share on other sites More sharing options...
schmuckingham Posted December 3, 2007 Report Share Posted December 3, 2007 Let me clarify. Centrifugal's usually overboost. Oh, and your's came from Ford, so it probably is broken. Sorry bout your luck. Not Ford, Eaton= pwnt junk Roots blowers FTL Quote Link to comment Share on other sites More sharing options...
Nate1647545505 Posted December 5, 2007 Report Share Posted December 5, 2007 I think Chris (Cougar) is still in Prague, but I don't think he has worked with Subaru control systems. By the sounds of it, the factory control system isn't a full fuzzy logic/PID control loop, or the target boost value hasn't been found/mapped in the ecu yet. I'm not sure what you've done to the car modification wise, but if your setting the duty cycle to its upper limit, you'll need a different control strategy. Whether that's a larger/faster acting valve, or more of them I can't say. Quote Link to comment Share on other sites More sharing options...
6 Speed S4 Posted December 6, 2007 Report Share Posted December 6, 2007 My car seems to adjust automatically to the cold temps for boost, it normally runs 18-21psi but in winter weather it holds around 15ish Quote Link to comment Share on other sites More sharing options...
thorne Posted December 6, 2007 Author Report Share Posted December 6, 2007 I think Chris (Cougar) is still in Prague, but I don't think he has worked with Subaru control systems. By the sounds of it, the factory control system isn't a full fuzzy logic/PID control loop, or the target boost value hasn't been found/mapped in the ecu yet. I'm not sure what you've done to the car modification wise, but if your setting the duty cycle to its upper limit, you'll need a different control strategy. Whether that's a larger/faster acting valve, or more of them I can't say. I'm going threw my map now. I'm tossing the stock control system in lua of a halman as soon as the tmic gets here in the spring. Till then I just increased my target boost and all is good. I've also been a stickler for over boost, I spent allot of time dialing my tune into were I don't see knock yet got allot in it. So I had my target boost set pretty close to what i wanted to see. the problem I see is when I do hit target boost the car pulls way to much wgdc to compensate. Like i said wont matter any more once i get the car back from IPS. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted December 6, 2007 Report Share Posted December 6, 2007 What part of this is not tech? Quote Link to comment Share on other sites More sharing options...
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