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Old 12-10-2004, 07:10 PM   #1
heavyDOODIE
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Default Boost spike all the way to 20 psi

i just installed an sti top mount on my car the other day, and last night as i was pulling onto the onramp, the car started to spool up really quick. and then SLAM!!!!!-as if i hit the brakes. CEL came on right away. i figured it was something to do with the i/c.
so i unplugged the battery when i came home. this morning, i put it back on, checked the car out, and then took it for a test drive. this time i took it up a small grade, and gave it some gas, also paying attention to the boost gauge. the needle sweeped all the way past 15 to 20. so i tried it again going downhill, and same thing. it also picks up 12 psi at partial throttle(closed loop)
this worries me a lot. do any of you guys know a fix to this? or will the ecu manage this out on its own in time?
the only mods to the motor are an uppipe, catless downpipe, and the sti i/c. no engine management upgrades.

thanks in advance.
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Old 12-10-2004, 07:13 PM   #2
cdvma
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Check the vacuum lines connecting the turbo, wastegate, and boost soleniod - chances are you knocked one loose.
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Old 12-10-2004, 07:21 PM   #3
heavyDOODIE
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will do, and thank you.
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Old 12-10-2004, 08:31 PM   #4
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The short vac hose with the restrictor pill can get pinched with the sti ic. More restriction= more boost/spike. Try shimming the ic up with some washers on the turbo side.
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Old 12-10-2004, 08:39 PM   #5
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Quote:
Originally Posted by cdvma
Check the vacuum lines connecting the turbo, wastegate, and boost soleniod - chances are you knocked one loose.
^^^ What he said.

Having the wastegate actuator hose disconnected has the following symptoms:

Really fast spoolup with even moderate throttle opening. The car feels very fast until you hit fuel cut. Half throttle is just about as fast as full throttle.

Very high boost which climbs until you hit fuel cut (after ~2 seconds above 17.5 psi) and the CEL comes on. Fuel cut almost always happens between 3000-4000 rpm. Most common is 3100-3400 in 4th, or slightly higher in third.

CEL that stays lit until you've cycled the engine on and off 4 or 5 times. The code set is P0244.

Ask me how I know.
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Old 12-11-2004, 07:47 AM   #6
heavyDOODIE
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yup, he was right. the first thing i saw when looking at the vacuum line was a small gash on the wastegate line. it was from the sharp corner of the i/c hitting the line.
so i just made a quick fix with some electrical tape until i can get a new one, and since the intercooler doesn't sit in the stock mount, i just put the screw back into the mount, under the i/c rubber mount- so it essentially jacks the i/c away from the vacuum line.
anyone know how much a line like that costs? or is it better to get a silicone one cut to length?
BTW- how do you know that 2stroke?

thanks you guys, you just saved me a gazillion dollars!!!!!!!!!
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Old 12-11-2004, 09:36 PM   #7
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Having used more than one type of hose for that specific purpose, I'd suggest using hose specifically designed to carry vacuum and pressure on a turbocharged car.

My local dealer (Timmons) didn't have the Subaru piece, but since they also sell VW's, they had a spool of hi-temp, reinforced hose that was OEM stuff for the 1.8t engine. Anyway, I bought a couple feet and it's been fine for well over a year now.

Normal vacuum hose will work for a couple months, maybe more. Over time, it will get hard, shrivel, and crack due to the high heat of the turbo. I don't think you want to use silicone for this application.

Edit: This particular hose never sees vacuum, only pressure, from atmospheric up to whatever your max boost is. You'll also want to keep the length as short as practical. Excess length will cause boost spikes.

Last edited by 2Stroke; 12-11-2004 at 09:50 PM.
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Old 12-11-2004, 10:57 PM   #8
cdvma
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There is a restrictor pill in the line before it is joined together by a T to go to the boost control solenoid - if that is the ripped line you must find a replacement that will hold that pill. If not, just replace it with equal diameter hose, I recommend silicone hosing as its durable.

Glad it was that easy
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Old 12-12-2004, 05:09 PM   #9
heavyDOODIE
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thanks again guys,

i was considering using silicone. i figure it has better heat resistance, and this was the line to the wastegate, above the compressor. so it sees a lot of heat.

now i just gotta get that hose, cuz who knows how ling this electrical tape will hold up - so far so good
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