EBC and MBC together?
#41
Elite Member
iTrader: (21)
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
I bought NXS ones. Regular price is $20 shipped. I ordered 8 total for a bunch of these jersey ******* and got em for $14.75 each. And Phil threw in a 9th one free. So $13.11 each shipped. From the DIY MBC sites it looks like you'll spend $12 in parts to make your own plus an hour or so in labor. For the few extra bucks it's worth it to me.
NXS Motorsports
NXS Motorsports
#43
Elite Member
iTrader: (21)
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
I was a lil weary about this one. eBay Motors: High Quality Manual Boost Controller Toyota Subaru Audi (item 320355035550 end time Apr-01-09 18:53:11 PDT)
#44
Elite Member
iTrader: (21)
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
Just wanted to update and say I installed the ebc+mbc as in my updated configuration diagram and it is working as planned.
Just for the hell of it I set my boost duty target table all to 100% to see how the Machine would respond if I didn't run this setup and only ran a simple MBC setup. Well it hits boost target which I happened to have set at 17psi with only 49% throttle so **** that. That's the exact reason I use an EBC to begin with, so I don't build boost too violently at low throttle.
Just for the hell of it I set my boost duty target table all to 100% to see how the Machine would respond if I didn't run this setup and only ran a simple MBC setup. Well it hits boost target which I happened to have set at 17psi with only 49% throttle so **** that. That's the exact reason I use an EBC to begin with, so I don't build boost too violently at low throttle.
#45
I was a lil weary about this one. eBay Motors: High Quality Manual Boost Controller Toyota Subaru Audi (item 320355035550 end time Apr-01-09 18:53:11 PDT)
#46
Elite Member
iTrader: (21)
Join Date: Jun 2006
Location: Point Pleasant, NJ
Posts: 2,957
Total Cats: 2
You are probably right that it will be fine but if it does vibrate and fall apart, like that **** end comes out you will not be telling your wastegate to open and you will overboost. if you have boost cut set you should be fine.
#47
Yeah, that's what I figured. The worst that can happen is hitting the boost cut.
Do you guys ever experience different boost levels with the MBC based on the temperature of the spring inside it? Isn't the spring stiffer when it's cold, effectively raising the boost limit? One thing I experienced soon after putting the MBC in (i just did it this week, and was going to setup the EBC with it this weekend) was that I hit the overboost cut once (the first time i floored it), but then never again. I had my overboost set to 187kPa, and every subsequent pull was topping out at 170kPa. So I can't explain why I would hit overboost that one time... except with spring temp or something like that.
edit: after some more driving and reading, I realized there are a lot more variables involved and this is a simpler issue relating to the common MBC issues of spiking, creep, etc... I'll have to experiment with this MBC and my overboost settings.
Do you guys ever experience different boost levels with the MBC based on the temperature of the spring inside it? Isn't the spring stiffer when it's cold, effectively raising the boost limit? One thing I experienced soon after putting the MBC in (i just did it this week, and was going to setup the EBC with it this weekend) was that I hit the overboost cut once (the first time i floored it), but then never again. I had my overboost set to 187kPa, and every subsequent pull was topping out at 170kPa. So I can't explain why I would hit overboost that one time... except with spring temp or something like that.
edit: after some more driving and reading, I realized there are a lot more variables involved and this is a simpler issue relating to the common MBC issues of spiking, creep, etc... I'll have to experiment with this MBC and my overboost settings.
Last edited by holy driver; 04-03-2009 at 02:54 AM.
#52
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,493
Total Cats: 4,080
I finally jumped on board. Dealing with a lot of boost loss due to ambient temps that I've never really dealt with before. The last two mornings were 65*F out and at lunch it had hit over 80*F. Would go from 13-14psi down to 10psi once it got hot out.
My initial results are good. I need to tune it a little better, as I have to bleed boost with the EBC since I get bad boost creep, but so far so good. But from 5K to 7K I've never seen it so flat.
Here's my plumbing using the ARO solenoid:
I'm about to go back out and see now that it's about 10*F warmer out if I'm still making the same boost.
My initial results are good. I need to tune it a little better, as I have to bleed boost with the EBC since I get bad boost creep, but so far so good. But from 5K to 7K I've never seen it so flat.
Here's my plumbing using the ARO solenoid:
I'm about to go back out and see now that it's about 10*F warmer out if I'm still making the same boost.
#53
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,493
Total Cats: 4,080
blah. it's performing good, but the problem is my boost creep.
If i tune it in the morning to get flat boost, it's bleeding too much when it's hot out. likewise, when i tuned it in the afternoon when it was warm, I had too much boost past 5.6K in the morning.
I'm thinking maybe I need a pressure regulator after the MBC to prevent any more boost to push the wastegate open after the MBC has been overcome....because all the way up to 5.6K the boost is perfect and I want to continue using the MBC...
thoughts?
If i tune it in the morning to get flat boost, it's bleeding too much when it's hot out. likewise, when i tuned it in the afternoon when it was warm, I had too much boost past 5.6K in the morning.
I'm thinking maybe I need a pressure regulator after the MBC to prevent any more boost to push the wastegate open after the MBC has been overcome....because all the way up to 5.6K the boost is perfect and I want to continue using the MBC...
thoughts?
#54
blah. it's performing good, but the problem is my boost creep.
If i tune it in the morning to get flat boost, it's bleeding too much when it's hot out. likewise, when i tuned it in the afternoon when it was warm, I had too much boost past 5.6K in the morning.
I'm thinking maybe I need a pressure regulator after the MBC to prevent any more boost to push the wastegate open after the MBC has been overcome....because all the way up to 5.6K the boost is perfect and I want to continue using the MBC...
thoughts?
If i tune it in the morning to get flat boost, it's bleeding too much when it's hot out. likewise, when i tuned it in the afternoon when it was warm, I had too much boost past 5.6K in the morning.
I'm thinking maybe I need a pressure regulator after the MBC to prevent any more boost to push the wastegate open after the MBC has been overcome....because all the way up to 5.6K the boost is perfect and I want to continue using the MBC...
thoughts?
#55
blah. it's performing good, but the problem is my boost creep.
If i tune it in the morning to get flat boost, it's bleeding too much when it's hot out. likewise, when i tuned it in the afternoon when it was warm, I had too much boost past 5.6K in the morning.
I'm thinking maybe I need a pressure regulator after the MBC to prevent any more boost to push the wastegate open after the MBC has been overcome....because all the way up to 5.6K the boost is perfect and I want to continue using the MBC...
thoughts?
If i tune it in the morning to get flat boost, it's bleeding too much when it's hot out. likewise, when i tuned it in the afternoon when it was warm, I had too much boost past 5.6K in the morning.
I'm thinking maybe I need a pressure regulator after the MBC to prevent any more boost to push the wastegate open after the MBC has been overcome....because all the way up to 5.6K the boost is perfect and I want to continue using the MBC...
thoughts?
#57
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,493
Total Cats: 4,080
Let me get this straight, your boost control issues change with ambient air temp, right? Mine is doing a similar thing but i'm boosting fine when cold but as underhood temps rise and my spring heats up i'm back to stock WG pressure presumably because the spring is getting softer as it warms up. If I adjust for my target boost when everything is as hot as its going to get, I hit overboost in the morning when everything is cold.
So I guess i really just need to port my wastegate more, because now that i think about it I don't think a regulator will work, because I need the wastegate to open more with higher revs, not keep it at the same level.
Keep in mind I've only had it installed a day, so i might need to play with it more, but right now I see a perfectly flat 12.5psi from 3800-5600RPM. In the morning, at 5600RPM it would rise to 14psi, with my solenoid bleeding from 100% to 65% Duty cycle. When I drove home and it was around 82* out, I made 12.5psi till 5600, and then it dropped down to 11psi at redline with the same solenoid settings. So it seems it's still effected by temps...
#60
Boost Czar
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,493
Total Cats: 4,080
deliverator, that wont help me, I'm not going to sit there twiddling a **** once i starting overboosting due to creep....
If anything I'll go back to just the EBC, Once I tuned for summer afternoons, it will be perfect until the weather gets cold again where I'll have to lower the numbers in the table a little. I've run this thing for 2 years now, I never remember it being so bad due to temps, but i dont really boost all the much driving to and from work.