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Old 10-12-2012, 11:16 AM   #1
robsuerto
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I have been running Stage 2+ SLWG OTS on a 12 wrx for the past month and a half I would say. Its getting cold up in new jersey and my boost levels are spiking higher than normal around 20.2 or so. Anybody experiencing similar problems?
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Old 10-12-2012, 11:21 AM   #2
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Are you running a catless downpipe? If so a tune cant tune out boost creep unfortunately.
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Old 10-12-2012, 12:35 PM   #3
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You could talk to Grimmspeed about having your turbo PnP, they might be able to open your waste gate passage up enough to fix most of your boost creep. Or you could convert your system to an external waste gate setup, but I am pretty sure you have to be protuned to run an ewg.
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Old 10-12-2012, 03:09 PM   #4
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Colder temperatures = higher max boost. This is extremely common and not necessarily a "problem". This happens with the stock tune and with very well honed pro tunes.

You shouldn't be concerned by it. I'd just recommend running a couple data logs occasionally and making sure everything looks normal.
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Old 10-12-2012, 03:13 PM   #5
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Quote:
Originally Posted by dsmtweaker View Post
Are you running a catless downpipe? If so a tune cant tune out boost creep unfortunately.
Yes I am. I am considering getting my car custom tuned, but I cannot come to a decision.
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Old 10-12-2012, 03:14 PM   #6
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Quote:
Originally Posted by sc00ter View Post
Colder temperatures = higher max boost. This is extremely common and not necessarily a "problem". This happens with the stock tune and with very well honed pro tunes.

You shouldn't be concerned by it. I'd just recommend running a couple data logs occasionally and making sure everything looks normal.
Temps would not have an effect on boost unless he is running a MBC.
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Old 10-12-2012, 03:16 PM   #7
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I just need advice on whether I should spend the 350$ and get a custom tune at a reputable tuner or should I keep this setup?
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Old 10-12-2012, 03:17 PM   #8
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Quote:
Originally Posted by robsuerto View Post
Yes I am. I am considering getting my car custom tuned, but I cannot come to a decision.
Are you getting boost creep, boost spike, or consistent boost?
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Old 10-12-2012, 03:18 PM   #9
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Quote:
Originally Posted by robsuerto View Post
I just need advice on whether I should spend the 350$ and get a custom tune at a reputable tuner or should I keep this setup?
If its boost spike, it can be tuned out. (quick jump to high psi, then starts going down)

If its boost creep, it can't be tuned out. (boost to normal psi, then slowly starts rising higher)

If its a constant boost, it can be tuned out... but if its something that just started happening, then there may be something else going on mechanically.
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Old 10-12-2012, 03:19 PM   #10
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Quote:
Originally Posted by dsmtweaker View Post
Temps would not have an effect on boost unless he is running a MBC.
Please tell me you are kidding...

Colder air = more dense air = more boost.

Ask any tuner about this.
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Old 10-12-2012, 03:26 PM   #11
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Quote:
Originally Posted by sc00ter View Post
Please tell me you are kidding...

Colder air = more dense air = more boost.

Ask any tuner about this.
Partially true, thats why an MBC will have different boost levels in different temps.

However an EBCS (which is what he would be running with his OTS AP map) works with the ECU to control it, so no matter the temp, your at the desired boost from 0 or 100 all the same boost
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Old 10-12-2012, 03:42 PM   #12
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Quote:
Originally Posted by dsmtweaker View Post
Partially true, thats why an MBC will have different boost levels in different temps.

However an EBCS (which is what he would be running with his OTS AP map) works with the ECU to control it, so no matter the temp, your at the desired boost, if its 0 or 100
I'm tuned with a Grimmspeed EBCS and I consistently hit max boost of 1-2psi higher when it's sub 50 degrees out than I do when it's 75+ degrees out. This IS common with an EBCS.

OP ask a local tuner about this. I guarantee they will say the same.
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Old 10-12-2012, 03:49 PM   #13
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so, I did a couple datalogs just now. no detonation at wot, and my a/f correction/learning numbers are in between the proper range. and there is slight boost creep in 3rd gear. Hits 18 psi at 3275 rpm, then drops down to 17 evenly at 3642 rpm. starting at 17psi at 3642, its goes back up to 18.5 at 4913 evenly. acts normal after that all the way to 6k rpm. looks like I might be ok. The thing is its 55 degrees outside now, humidity 50% id say. This morning it was like 80% humidity and 44 degrees out and thats when I spiked 20.2
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Old 10-12-2012, 03:57 PM   #14
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Quote:
Originally Posted by sc00ter View Post
I'm tuned with a Grimmspeed EBCS and I consistently hit max boost of 1-2psi higher when it's sub 50 degrees out than I do when it's 75+ degrees out. This IS common with an EBCS.

OP ask a local tuner about this. I guarantee they will say the same.
Then you have an issue. One of the main perks to EBCS over MBC is temperature compensations. I live in Northern Michigan, we see temps of 100 in the summer, to negatives in the winter. I am at 20psi, with my alarm set at 2.1, in 2 years my alarm has never gone off. There should be no fluctuation with an EBCS setup... if your getting one, and your tuner says its normal, time for a new tuner.


Even if that was the case, the AP maps IIRC are at 17psi +/- .8 so for the OP to be getting over 20pounds, something else is going wrong.
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