Josh Smith Posted April 11, 2020 Report Share Posted April 11, 2020 Hi Guys I am in the process of tuning my vehicle. I have the fuel map done for on boost up to 1 bar up to 7500rpm but as soon as i up the boost to like 1.2bar and it hits 6000rpm it drops to 0.7 bar. I have check the trim tables and monitored and data logged WG Duty cycle and it is still commanding what i have set. its not hitting any limits. has any one come across this issue. Thanks Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 11, 2020 Report Share Posted April 11, 2020 Probably attaching a copy of the tune and a log would be a good place to start. https://www.youtube.com/watch?v=_P1LRANeO4A Quote Link to comment Share on other sites More sharing options...
Josh Smith Posted April 11, 2020 Author Report Share Posted April 11, 2020 log file and map log 5.llg FR2Q1K Map rev 3.pclr Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 11, 2020 Report Share Posted April 11, 2020 Its not really the boost dropping at 6000, but you have a really odd oscillation below 6000. To me it looks more mechanical like the BOV is bouncing open and closed or something. If you turn aux 6 off (or unplug boost sol), does the boost curve look more stable? Quote Link to comment Share on other sites More sharing options...
Josh Smith Posted April 11, 2020 Author Report Share Posted April 11, 2020 If I drop the wg dc down to 20 it is fine. and when at 24 the boost comes in and out like what you have shown. I have attached another capture of what i mean i would have had the boost solenoid at eith 15 or 30hz when it did this. i will try another bov tomorrow but don't think that is the problem. this wasn't a problem until link was fitted. Its worth mentioning I have just fitted bolt on upgrades hence why link has been fitted. Turbo upgrade GDC Garrett 3071R twin scroll turbo direct bolt on, ID1050 injectors, dw300 fuel pump, link g4+ hks 3" turbo back exhaust. Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 11, 2020 Report Share Posted April 11, 2020 The boost control was set up pretty weird in that map you attached but your log said open loop so I assume you changed to closed loop after the log? it didnt appear to be doing anything weird anyway, but I would stick to open loop with the same value through the whole WG table until you get it sorted. 25Hz is normally best for a common mac valve. Quote Link to comment Share on other sites More sharing options...
Josh Smith Posted April 11, 2020 Author Report Share Posted April 11, 2020 yes running open loop and have tried at 25hz and 20 across the whole table. my process was started at 1 bar boost and go up from there so ie as in increased from 20 to say 21 or 22 duty cycle across the whole table that is when the boost would come up and hold to 6000rpm then drop to .7 bar its like the boost solenoid can't control it i did a pwm test on the BS and its ok at low pressure but when the pressure increases in stops. can these reach a certain boost level and fail?? Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 11, 2020 Report Share Posted April 11, 2020 21 minutes ago, Josh Smith said: i did a pwm test on the BS and its ok at low pressure but when the pressure increases in stops. can these reach a certain boost level and fail? Assuming you have a mac valve? The mac valves were originally for industrial compressed air pneumatics so should work fine up to a couple of hundred psi. I would suspect either it is just failing or if it is new it is potentially a fake. Quote Link to comment Share on other sites More sharing options...
Josh Smith Posted April 11, 2020 Author Report Share Posted April 11, 2020 using subaru factory boost solenoid Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 11, 2020 Report Share Posted April 11, 2020 Ok, that is a big unknown. I have never seen anyone use one so have no idea how they respond or if they are usable. Quote Link to comment Share on other sites More sharing options...
Josh Smith Posted April 12, 2020 Author Report Share Posted April 12, 2020 tested the boost solenoid today and fails as 18psi tried another one and same thing so problem is now solved. thanks Adam Quote Link to comment Share on other sites More sharing options...
arxrts Posted April 17, 2021 Report Share Posted April 17, 2021 Hello, Can anyone tell me if is this a real or fake mac valve? Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 17, 2021 Report Share Posted April 17, 2021 Yes, that is quite an old one ~2010, but we have always been supplied direct from MAC Valves Pacific - the main distributor. We used to specially order them without the blue paint. Quote Link to comment Share on other sites More sharing options...
arxrts Posted April 18, 2021 Report Share Posted April 18, 2021 Thanks for your reply. It is indeed an old valve purchased in 2014. It recently leaked and i had some issues with boost. While searching I found that those who have the letter "P" are fake, so I asked you. Anyway, I loosened it, cleaned it and tightened the screws again so that it does not leak until 5bar and I haven't boost issues anymore. Quote Link to comment Share on other sites More sharing options...
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