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Old 05-31-2002, 05:07 PM   #1
WRXIN
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Default So, why bother increasing boost?

Ok, I'll admit it, I'm confused. I'm ready to start the mods. I have all my gauges so I can see what heck I'm doing. I've read a lot about mbcs and abcs and the boost monkey, etc. On the one hand, increasing boost seems like a no-brainer easy way of increasing performance. Then I read that the ECU will pull timing anyway, so there is no point in increasing boost.

What's the deal? Will a uni-chip fix this problem? Is there a problem with increasing boost? Considering all the manufacturers out there making boost controllers, they must have some positive effect.

Please, no search comments. I have spend hours reading threads on this. I am looking for a definitive answer so I can figure out what my next purchase is going to be. Will increasing boost with an otherwise stock WRX help, or will the ECU screw everything up?

Thanks everyone.

-Mark
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Old 05-31-2002, 05:14 PM   #2
chudlo
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Default Yahh! What he said.

I just did the restrictor mod and am wondering the same thing.


chudlo
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Old 05-31-2002, 05:17 PM   #3
Cosworth
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Default

The ECU will only be able to pull so much timing back. It can't match the HP increase value with timing retard to the "tee". One way to look at the situation you describe is, "Two steps forward, one step back". While increasing the boost you gain X additional power, but the ECU may pull back some timing for knock and thus give you X-y power with y being the amount of hp loss resulting from the timing retard. Its not a total "lose-lose" situation.

PS. This post is just so chock full of cliche's, its not even funny!
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Old 05-31-2002, 05:20 PM   #4
WRXIN
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Thanks Cosworth, that makes sense. Anyone else?

I've read of people who are returning their high boost levels to stock levels to get better performance. That makes no sense to me.

Help out a fellow WRXer!?
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Old 05-31-2002, 05:25 PM   #5
TurboRex
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For the best performance set boost at about 16-16.5psi in 4th. Some cars are getting the best at 15-15.5. I think the difference is mainly accuracy of gauges. If you have a scanner, you can check the accuracy of your gauge. Increasing boost is the cheapest most effective mod you can make.

Greg
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Old 05-31-2002, 05:39 PM   #6
Diranged
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It seems to me that if you have a daily street driven vehicle, the easiest and safest thing to do is get the boost monkey and pull the restricter. That way your not always running full boost (ie, unless your going WOT), and you have a box that is making sure that you dont run lean and overheat anything. I keep seeing people put MBC's on their cars and I dont get it because it seems like the stock turbo is setup to run at its maximum efficient point of boost anyways... Someone please tell me if im wrong though!

--Matt
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Old 05-31-2002, 05:39 PM   #7
mynew02
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Just go with a staged kit and stay under 17psi. I think some are causing the trouble by making mods after they get their kits and not having their cars re-tuned. If you don't live near a tuner don't try anything too wild.

-Jonathan
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Old 05-31-2002, 06:02 PM   #8
KJR
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first don't bother with the restrictor mod if you are running the stock ECU. i have yielded best overall results around 15psi. the computer will sustain timing at this level. anything over this without an ECU upgrade and timing will be pulled during long revs. i don't want to void my warranty so i have installed only parts that can easily be un-installed, hence, no stage packages. i had an EBC and it was totally erratic and i was getting full boost at 3000rpm, hello high EGT's. now, the Monkey and i like it much better. 16-17 psi for short "spurts" of boost and 14-15.5 for sustained pulls. of course, higher boost means higher EGT's but this is working for me. trying to hold high boost for long periods seems to be a problem for my car, but i am pretty mellow for the most part and don't run the car real hard for long periods. just my $.02 good luck
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Old 05-31-2002, 06:06 PM   #9
WRXIN
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KJR, so it looks like you like your boost monkey. Are you running with a uni-chip or anything else, or just the boost monkey?

Thanks,

Mark
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Old 05-31-2002, 06:07 PM   #10
Diranged
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I wish the BOostMonkey would come with a little sticker for the car... Maybe like an "Intel Inside" symbol except "Monkey Inside"

--Matt
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Old 05-31-2002, 06:14 PM   #11
KJR
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wrxin, just the monkey. a uni-chip will do essentially the same thing but a bit more as far as your a/f ratios through the rpm range. i am going to install a a/r calibrator and meter to see how it's running soon. feels good though, much better than the previous EBC and i can set the monkey to bring full boost at 85% throttle or not at all. if someone else is driving i set the t.p.s. so high that the car will onlyrun off the wastegate.
and yeah, we need Kris to do some stickers for us.
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Old 06-10-2002, 01:23 PM   #12
CirrusWRX
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Quote:
Originally posted by Diranged
I wish the BOostMonkey would come with a little sticker for the car... Maybe like an "Intel Inside" symbol except "Monkey Inside"

--Matt
There is a "monkey inside" logo on the website -- http://www.boostmonkey.com -- but I haven't seen any stickers yet!
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Old 06-10-2002, 03:00 PM   #13
AndyHidley
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You can run as much boost as you want up to the point of detonation. From that point on the ECU will retard timming and it'll run crappy.
Detonation will be caused by injectors maxing out, fuel octane too low, intake charge temp too high, or too much timing.
Dont forget that subaru says in the manual that its "ok" to run regular octane gas in a pinch. But the ECU will pull timming upon seeing higher boost levels.
The unichip sellers assume that you have enough common sense to only run the highest octane that you can find. They programmed the chip around this and thus can stretch the limits of the EJ20 design to near max. (max being injector capacity, timming, rod and head gasket strength, etc)
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