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Old 07-04-2006, 04:47 PM   #1
motoryder
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Default Cobb Stage 2 19Psi!?!?!

PROBLEM FIXED: Lengthened the wastegate arm ~3 turns boost goes to a little under 17, then holds at a solid 16.3 now. Thanks again for all of the responses guys.



I flashed stage 2 on my 2002 Wrx about a month ago and figured that the boost would settle down after some miles of driving. Hasn't yet, and I am afraid to floor it on the freeway as I am afraid of blowing up my block. If I floor it in fourth gear, the boost spikes to .14 mpa on the stock guage, and then settles down to a little over .13 . I double checked this value with the AP live boost, and it is maxed at 18.3 in these heavy throttle positions. I know target should be around 15.8 +- .5 psi. But this is ridiculous. Is there anybody else out there who has had this problem, and if so, how did you fix it? Mods are: Invidia V2 Downpipe, Apex catback, cobb stg 2. Also I have the restricaor pill in, and all stock vaccuum lines. I tried taking out the pill, but hit less than stock boost levels (about 8 psi). Any help would be much appreciated. I was thinking about lengthening the WG arm a turn or so. Would this help?

(Please no search nOOb responses or anything like that..i've looked.. but if you have some helpful information, feel free to post)

-Michael
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Last edited by motoryder; 07-09-2006 at 03:49 AM.
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Old 07-04-2006, 04:51 PM   #2
Snow Drift
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are you sure you use the Stage 2 map? Did you buy the AP new or was it used?

You should try reverting to stock and then redownload the Stage 2 map off the website and reflash or else get the car looked at by a Pro Tuner. That is way too high for Stage 2.
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Old 07-04-2006, 04:55 PM   #3
motoryder
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New ap..bought from harman motive....California stage 2 map...I was thinking of going back there to get it protuned to see whats up. Maybe the BCS is dirty or something?
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Old 07-04-2006, 05:11 PM   #4
benw
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check your restrictor pill (verify orifice is correct size), and consider putting a bit of slack into your wastegate arm.
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Old 07-04-2006, 07:18 PM   #5
motoryder
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Restrictor pill is the right size...gonna try loosening the WG arm this week....that seems to be the thing to do if you aren't hitting enough boost....(tightening it)...so just the oppisite should work in my situation...ill give it a go.
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Old 07-05-2006, 08:24 AM   #6
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I suspect its a bad gauge. Above 0.1 MPa the gauge is not accurate. Try reading live boost with the Accessport. If you have a laptop, use your AP cable to log with ECUExplorer.

You will want the following parameters:

Engine speed(RPM), Thottle position(in %), BTDC, Kock Correction, Injector Duty Cycle, Relative manifold pressure(boost in PSI), and O2 sensor 1.

Log a 3rd gear pull from 2K RPM to redline and post the log.
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Old 07-05-2006, 03:17 PM   #7
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/\ Im betting he's correct. You would feel the huge fuel cut jolt with that much boost.
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Old 07-05-2006, 03:23 PM   #8
Valhakar
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I am pretty sure Fuel cut is 20 or 21 PSI. I spiked to 19 a few times while dialing in my MBC to 18 PSI for the track. Car didn't mind a bit...................... till the knocking started.

*Edit*

I am running EM with the MBC. Never try running a MBC with the stock engine management.
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Old 07-05-2006, 04:11 PM   #9
Snow Drift
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Quote:
Originally Posted by Valhakar
I suspect its a bad gauge. Above 0.1 MPa the gauge is not accurate. Try reading live boost with the Accessport. If you have a laptop, use your AP cable to log with ECUExplorer.

You will want the following parameters:

Engine speed(RPM), Thottle position(in %), BTDC, Kock Correction, Injector Duty Cycle, Relative manifold pressure(boost in PSI), and O2 sensor 1.

Log a 3rd gear pull from 2K RPM to redline and post the log.
Nope, he already used his AP to read boost...

Quote:
Originally Posted by motoryder
I double checked this value with the AP live boost, and it is maxed at 18.3 in these heavy throttle positions. I know target should be around 15.8 +- .5 psi. -Michael
Id revert to stock map, unload the Stage 2 map from the AP, delete it, then redownload the Stage 2 cali map from cobbtuning.com and retry it.
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Old 07-05-2006, 07:02 PM   #10
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Similar problem as you...My STi was spiking to 21psi a couple times while I was at the track, have been using the 93 oct Stage 2 map...I thought it was only supposed to reach 18 psi max but it definatley was hitting higher than that in certain gears...not sure if I should be worried or not, I was running 100 oct so not sure if that made any difference....but 3 psi over normal max boost levels seems weird..
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Old 07-05-2006, 11:25 PM   #11
motoryder
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Im going to try the datalogging as soon as I can, and i'll post the log. thanks for all of the good responses. Keep the possible solutions coming guys....good stuff.
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Old 07-05-2006, 11:52 PM   #12
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19 psi could get fugly with cali gas!

It could be a waste gate issue, meaning it's getting stuck and isn't opening properly. . . Give the arm a few good tugs to make sure it's not being obstructed.

What kind of DP do you have? some DP's have a portion that protrudes into the turbo and can interfere with the WG causing higher than wanted boost levels.
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Old 07-06-2006, 04:48 AM   #13
motoryder
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invidia V2 downpipe....bellmouth design..but im going to try adjusting the wg a turn to see if that helps.
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Old 07-06-2006, 12:00 PM   #14
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doesn't the v2 have the WG exhaust gas seperator? If it does it may need to be trimmed, it may be hitting your WG.
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Old 07-06-2006, 07:48 PM   #15
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Are you using the HWG or the LWG map?
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Old 07-06-2006, 08:01 PM   #16
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revert your car to stock and see what your car then boosts to.. that shouls help narrow down the problem as mechanical or with the map.
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Old 07-06-2006, 10:16 PM   #17
motoryder
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Downpipe is a bellmouth design....interesting thing though...flashed to stock, and it is still reading higher than normal..maybe about .01-.02 Mpa less. This leads me to believe that it could be a mechanical problem...
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Old 07-08-2006, 06:14 AM   #18
motoryder
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ok ...quick question...lengthen or shorten the wg arm in my situation?
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Old 07-09-2006, 02:44 AM   #19
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It was my understanding that, with the addition of an up-pipe and downpipe, you could see slightly higher boost readings..

Someone correct me if I am wrong.
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Old 07-09-2006, 03:47 AM   #20
motoryder
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^^Correct....but not to these extremes..oh got the problem fixed though...adjusted the wastegate a little and everything is peachy now..boosting to a little under 17psi and then tapering off to a solid 16.3 psi..yeah...I said peachy.
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