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Old 08-05-2002, 09:50 AM   #1
Steven Saunders
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Default How much will weather change boost?

I have been having a little trouble setting my mbc to the levels I want it. Yesterday it would hit perfectly at what I want it (about 15.5) and last night it would spike in 3rd or fourth at about 16.5-17!! Is this bc of weather or what? I have turboback, stage 0, and a couple other mods. Does the unichip regulate boost??? Sorry for all the questions, I am just kind of at a loss here. If this is normal, spikes aren't safe are they?
THanks
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Old 08-05-2002, 09:58 AM   #2
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Yeah, weather will have an impact on boost. Dunno what the difference in heat was during the day/night in your area... but mine is usually decent... the day it'll be 26-30 degrees celcius and 'll get the exact boost I set it to. At night if it hits 15 celcius then I'll hit about .5 higher but not 1.5-2PSI difference like you're getting!

But I don't have any exhaust mods... so I'm less prone to spikes...
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Old 08-05-2002, 09:58 AM   #3
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Weather can affect boost greatly. The hotter it is, the less dense the air is and thus less boost. An MBC is not a set it and forget it type thing. You'll have to make adjustments based on weather conditions. That was my reasoning for getting a Blitz SBC-ID. I can adjust everything from inside the car. The Unichip doesn't regulate boost. . that's why you have a MBC with the Vishnu setup. IIRC, the TurboXS Unichip has a boost controller on it due to the harness setup that they use, however, they still include a ABC so that the user can play with the boost settings. Boost spiking is usually not too good, but as long as you're not overboosting to 20+ psi or something, 16 or 17 psi should be OK. Boost spiking is something that usually happens with MBC's. Turn down the MBC a little to minimize the spiking.

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Old 08-05-2002, 10:02 AM   #4
Steven Saunders
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Ok, so a EBC would take care of all this crap? How much is a EBC, I dont' know if I need the Blitz one or not (I have heard those things are ungodly expensive). Thanks.
Steve
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Old 08-05-2002, 10:18 AM   #5
SubyRex
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They are ungodly expensive... nothing you can do about that... what is your MBC type? Bleed & ball & spring? or ???
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Old 08-05-2002, 10:24 AM   #6
Steven Saunders
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Excuse my ignorance, but I am really not sure...it is the one that came with the Stage 0. There is a nut that you loosen and then tighten or loosen the bolt going through it to adjust. Hope that makes sense. Which EBC would you guys recommend?
Steve
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Old 08-05-2002, 10:37 AM   #7
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Sounds like a Dawes type MBC. I haven't tried any other EBC's. . .I have a Blitz SBC-ID. I love it. It's performs great and does exactly what I ask it to do. It will cost you about $480 shipped. . .you can get one from mpjperformance.com. It uses dual solenoids so it's fast and I have never gotten any boost spiking with it. You can change the boost setting by just pressing dial, rotating it to the setting you want and then hitting the dial again. There are also 4 channels that you can set up so that you can change between them.

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Old 08-05-2002, 10:52 AM   #8
Steven Saunders
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Calvin, I can't find mpjperformance.com. Man, I will be counting my pennies for one of these, I think my wallet is crying
Steve
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Old 08-05-2002, 10:56 AM   #9
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Steve,

Try looking in the vendor forum. They post there and that's where I got my unit.

Calvin
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Old 08-05-2002, 10:58 AM   #10
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Quote:
Originally posted by Steven Saunders
Calvin, I can't find mpjperformance.com. Man, I will be counting my pennies for one of these, I think my wallet is crying
Steve
Bah... just keep your pennies... it take me about 30 seconds to set my MBC... I'd rather take 30 seconds of my time to put the boost down and use that 430$ difference for NOS kit, injectors, tires... you know, the usefull stuff...

OR, you can give me that 430$ and I'll go to your place everytime the weather changes to put your MBC to the correct setting
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Old 08-05-2002, 11:02 AM   #11
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AW MAN!!! I can't believe I forgot the BOOSTMONKEY!!!

It uses your factory EBC (factory solenoid) by controlling the bleed! You can set the boost inside the cabin using a dial... cost is 4times lower than a standalone EBC and it works just as good!

Check them out: www.boostmonkey.com
Or make a search on Boostmonkey, you'll find TONS of posts about it.
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Old 08-05-2002, 11:09 AM   #12
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With the boostmonkey, you need to keep in mind that although it is cheaper, it does use the factory solenoid, which will become the bottleneck should you decide to up your boost. If you keep boost around the 15-16psi area, you should be fine. If you decide to get a larger turbo or boost any higher, you'll have issues with spiking as the factory solenoid won't be fast enough.

As for the price of an EBC. . yes it's a lot more expensive. It all depends on what you want to do. If you want to be able to change boost without having to pop the hood, it's the way to go. It's great that you don't mind popping the hood to change your boost, but while you have to make an adjustment, then drive to test it and stop and make further adjustments, I can do it in the car without stopping. Also, I can set one channel for daily driving, yet if I decide I want more performance at a stop light I can make the adjustment in seconds. Of course, if you want to ask the guy next to you to hold on a few minutes while you pop the hood and get your allen wrench out, that's up to you.



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Old 08-05-2002, 11:10 AM   #13
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Boost is affected by weather but you can minimize it's effect by sourcing boost from manifold rather then from the nipple on the turbo outlet. It's an old trick that I have been using for years. The only reason I keep my boost source stock is I'm not that familiar with how detonation resistant WRX is, so I'd rather my boost go down in hot weather as a safety precaution.

Alex...
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Old 08-05-2002, 11:27 AM   #14
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Now how about the Turbo XS Dual Stage? How could this alleviate boost spiking at cooler temperatures and high EGT's? Just basically set a lower boost level (for daily driving and night time driving) and a higher boost level when you might want to do some spirited driving? Is this about the jist of having this unit?
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Old 08-05-2002, 11:30 AM   #15
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Yep... that's another MBC you could go with... setting A for hot, B for cold at the flick of a switch...
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Old 08-05-2002, 11:33 AM   #16
Steven Saunders
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I wouldn't mind if it just took me a few seconds to adjust the mbc, but where it mounts and how you adjust it...you either have to be wearing fire retardant gloves or the engine must be cold!! It is so hard to get into the area where you install it and adjusting it is just real pain. All of these replys are appreciated, I now have a bunch of options
Steve
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Old 08-05-2002, 11:41 AM   #17
SubyRex
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Well... depends where you mounted it also! some mount it near the intercooler in front or on the side... sure it's gonna get blazing hot REAL fast...

Just put it where the FBC is, right under that small black panel, it'll make things a bit longer on the hoses, but 2-3 inches won't do you harm... and it'll keep it MUCH cooler than RIGHT OVER the turbo
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Old 08-05-2002, 11:42 AM   #18
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I love my boostmonkey, but he prefers cooler climes as well. On a hot (and let's not forget humidity as a factor too!) I will see a change as much as 1-1.5psi lower than my "normal settings." I like the monkey because I know I will not be increasing the boost much beyond 16 psi (because I'm a wuss!) So he's been working fine, and being able to adjust it from within the cabin for $100 (I got mine used) it's been wondrous for the both of us.

and he's got LED's too!!!

imagine that -- LED's!!! BLING BLING YO!!!
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Old 08-05-2002, 11:45 AM   #19
Steven Saunders
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SubyREX, could you give me a little more insight to where you are talking about where to mount it. Damn it gets hot over the turbo!
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Old 08-05-2002, 12:42 PM   #20
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Quote:
Originally posted by Steven Saunders
SubyREX, could you give me a little more insight to where you are talking about where to mount it. Damn it gets hot over the turbo!
Mount it on the pipes on the intercooler. The turboxs HPMBC is less prone to boost spikes because it has a ball and spring in conjunction with a bleeder valve. For 99 bucks that should solve your problem. I would tune the mbc at nite because cold nites are more prone to spikes than hot days.
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Old 08-05-2002, 12:49 PM   #21
amelnikov
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I don't know why you guys are so intent on spending $500 on boost controller, when you can get a ball and spring type that will have at most 1 psi spike if setup correctly and will have at most 1-2 psi weather effect. And it has the fastest boost rise and least boost creap. And it costs less then $20!
And it could be made into dual stage for about $5!

Alex...
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Old 08-05-2002, 01:03 PM   #22
SubyRex
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Quote:
Originally posted by Steven Saunders
SubyREX, could you give me a little more insight to where you are talking about where to mount it. Damn it gets hot over the turbo!
Sure!! Found this picture on the net!


If you look at the top-left corner of the picture, just higher then the airbox, there's a black panel with 2 black "hand-turnable" (wow... I just invented a word ) screws. Also, if you follow your boost hose fron the T connector that joing the nipples on the turbo you'll see it goes under that black panel... that's where the factory solenoid is (among other things) just mount it in there!

Next to the intercooler a 3 minute drive would make the MBC untouchable!!! If you mount it at the far left of the picture under that panel you'll see that it can be adjusted almost anytime! Some people say that spikes may occur more often when you make the hoses longer... but you're only making the hose about 1-2 inches longer than the one that goes to the FBC...
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Old 08-05-2002, 01:10 PM   #23
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You need to keep in mind what an EBC give you. Aside from the ease of changing settings, it also gives you more features. It allows you to store multiple settings into different channels and switch between them. They also replace the factory solenoid with a higher performing unit. A dual solenoid can operate a lot faster than the stock one and it would give you much smoother boost control. You also get things such as overboost warning/protection, scramble modes, peak hold, and in some cases data logging.

For me, those factors were enough to justify getting an EBC over a MBC. In addition, I really don't feel like getting out of my car to adjust it. . even if it is only once or twice a week. Everyone has their own preferences. If you want to save money and go for an MBC, more power to you. I chose to get an EBC. I didn't feel it was a waste of money. Some people spend $1000 on a body kit, which I feel is a waste of money, but that's my opinion.

The main point is that you have to do the research and decide what's best for you.

Calvin
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Old 08-05-2002, 01:47 PM   #24
amelnikov
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Here is where I mounted mine. Just make sure that you don't lock the locking nut untill you are done adjusting your boost, as it gets a little hot and you don't want to be forcing a hot nut off.

Alex...
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Old 08-05-2002, 01:51 PM   #25
amelnikov
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Here is another shot.

Alex...
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