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Old 10-22-2005, 01:30 PM   #1
richde
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Default Wastegate actuator adjustment clarification/warning

This is for AP users that aren't quite hitting target boost.

I was hitting 14.0-14.1psi regularly with my Cobb Stg. 1 set up so I decided to tighten up the wastegate actuator a bit. There's instructions and photos elsewhere, it seems like "a turn" is the general opinion on where to start. I gave it what I interpreted "a turn" to be, a 360 degree rotation, and my boost went up almost 2psi to 16.0!! So just as a warning and clarification, try a "half turn" or 180 degree rotation, to begin with if you're just under boost targets. Hopefully that'll be all it takes and it'll prevent you from having to remove your heat shield twice like I did. I haven't test driven yet with the half turn yet, but I'll edit and update tomorrow. But if one complete turn give 2 psi, one "should" or might just give me 1psi up to 15.0-15.1 which is within the 14.7 +/- .5psi target.
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Old 10-22-2005, 01:51 PM   #2
RobSub
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from my experience you should reset the ecu everytime you change that. You will find that if you do that every time that the adjustment is way less sensitive.
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Old 10-22-2005, 02:08 PM   #3
bboy
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Every turbo is different in this respect. I'd be very careful using something as crude as spring tension to control boost. Re-setting the ECU may help the boost contorl solenoid "learn" to control boost, but if you over do it, and spring tension is too high, you'll end up with uncontrolled boost.

Another question to ask is: has Cobb tuned in this region of the fuel map? What's the max boost they tuned for?
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Old 10-22-2005, 06:04 PM   #4
richde
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Quote:
Originally Posted by bboy
Every turbo is different in this respect. I'd be very careful using something as crude as spring tension to control boost. Re-setting the ECU may help the boost contorl solenoid "learn" to control boost, but if you over do it, and spring tension is too high, you'll end up with uncontrolled boost.

Another question to ask is: has Cobb tuned in this region of the fuel map? What's the max boost they tuned for?
This is Cobb's suggestion, target boost for stg. 1, like I said, is 14.7 +/-.5psi. Their software tells the car to make target boost, the inability to do so is mechanical, makes perfect sense when you think about it.

I didn't reset it, mistake on my part, going testing in a while, after a reset, lol. Still, going up 2psi is a bit much, probably just a misunderstanding of previous posts in what is meant by "a turn."

Edited to add: After reseting the ECU with the AP, cruising down the highway tonight (~60F) 2500 rpm in 5th gear, hit the gas, boost was at 15.1psi by 3000 rpm. One 180 degree turn of the wastegate actuator did the trick.

Mods:
Cobb AP Stg 1 91 octane (ver 1.30) Realtime map over same basemap.
Samco TB hose
STi intercooler

Last edited by richde; 10-22-2005 at 11:58 PM. Reason: results after testing
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Old 10-23-2005, 01:01 AM   #5
intence
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Quote:
Originally Posted by richde
This is for AP users that aren't quite hitting target boost.

I was hitting 14.0-14.1psi regularly with my Cobb Stg. 1 set up so I decided to tighten up the wastegate actuator a bit. There's instructions and photos elsewhere, it seems like "a turn" is the general opinion on where to start. I gave it what I interpreted "a turn" to be, a 360 degree rotation, and my boost went up almost 2psi to 16.0!! So just as a warning and clarification, try a "half turn" or 180 degree rotation, to begin with if you're just under boost targets. Hopefully that'll be all it takes and it'll prevent you from having to remove your heat shield twice like I did. I haven't test driven yet with the half turn yet, but I'll edit and update tomorrow. But if one complete turn give 2 psi, one "should" or might just give me 1psi up to 15.0-15.1 which is within the 14.7 +/- .5psi target.
i have the same problem. can you post the link to pics/instructions?
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Old 10-23-2005, 03:55 AM   #6
richde
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Quote:
Originally Posted by intence
i have the same problem. can you post the link to pics/instructions?
http://forums.nasioc.com/forums/show...e+actuator+arm
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Old 10-23-2005, 10:19 AM   #7
intence
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thanks!
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Old 10-24-2005, 12:21 PM   #8
SlideWRX
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You might have been able to leave it at two (180) turns, as the ECU would have adapted to it and brought the boost down. either way, glad to see it worked.

Tom
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