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Old 12-15-2002, 10:07 PM   #1
Scooby Newbie
Member#: 16336
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Eugene, OR
2002 WRX Wagon

Default New MBC, I get diffrent boost in diffrent gears

Iím testing out a Dawes Devices Hybrid Manual Boost Controller (http://www.dawesdevices.com/boost.html) that I borrowed from a friend. I used the directions from Scooby mods and got it in there without a problem. I installed it using the stock hoses. I plug up the hose that ran to the stock controlling device I used one of my spare 3/16th resistors and melted one end shut. I have the stock steering column boost gauge that measures in MPas.

I set it pretty low to start out with about .04 is what I got out of it. My goal is .1 or, from what I gather should be 14.5 lbs (correct me if Iím wrong). So I went out for another run, got it up to .06. Then I got .07 on the next. Finaly I think I got the ratio of turns down and I get it almost perfect at .095. I turn it about a quarter turn more and Iím there.

I had been using a pretty big not so busy road to test it at. I didnít really get out of first. So I go back to my house, grab my roommate (whoís boost control it is) and we go out to get some Jack in the Box. On the way there, I hoped on the freeway to see what it would do at speeds. I noticed that in 4th, I was up to like .105 and in 5th I almost hit .11.

From my basic understanding of how this all works, it kind of makes sense. I know the stock gauge isnít too great. I plan on getting a new vacuum line for it, I hear that helps. Iím going to turn it down so I donít go over .1 in 5th.

Is the behavior normal? Whatís happening?
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parid is offline   Reply With Quote
Old 12-15-2002, 10:16 PM   #2
Scooby Specialist
Member#: 14141
Join Date: Jan 2002
Location: 13.239@102.85 @ 5800 ft on 13T
2002 Impreza WRX

Default higher gears and engine load

Its a function of higher engine load in the higher gears ( less mechanical advantage, so the engine has to work harder). More load = more highpressure exhaust to drive the turbo = more boost.

hotrod is offline   Reply With Quote
Old 12-15-2002, 10:19 PM   #3
Scooby Guru
Member#: 12454
Join Date: Nov 2001
Chapter/Region: Tri-State
Location: Vermont
10 Toyota Taco
K8 SV650SF


hotrod explained it pretty well.. My advice would be to tune your boost controller for .1bar in 4th gear to be safe.
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Old 12-15-2002, 10:53 PM   #4
rex n effect
Scooby Specialist
Member#: 15289
Join Date: Feb 2002
Chapter/Region: MAIC
Location: Between Trenton and Philadelph
02 wrx pollen silv
& '11 TDi dadwagon


according to shiv from vishnu performance, you should set your boost in 4th gear at full throttle. I believe he says 4000 rpm, but with a gutted uppipe, you should get full boost at under 3000.
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Old 12-16-2002, 01:10 AM   #5
Scooby Newbie
Member#: 16336
Join Date: Mar 2002
Chapter/Region: NWIC
Location: Eugene, OR
2002 WRX Wagon


parid is offline   Reply With Quote

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