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Old 07-18-2009, 01:02 AM   #1
wrxchitown
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Default cant get rid of power dip at 4500 rpm


First off not sure if this should be in this forum or over in tuning. but here is my problem anyway.Trying to figure out what is causing the dip in power between 4500 and 5000 rpm.

2.0 first run with new turbo



2.1 added a degree of timing




2.2 removed a degree of timing vs 2.0





2.4 added 1 degree of timing before 4000 and used same timing as 2.0 above 4000(i think I got a little wheel slip)





any ideas what is causing it??

mods:
2006 WRX TR
PE1820
GMBCS
bosch 1000cc
walboro 255
E85 GAS
CSS TMIC
APS 3" turbo back
Open Source tune
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Old 07-18-2009, 02:01 AM   #2
noonagon
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mega meth

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Quote:
Originally Posted by wrxchitown View Post
First off not sure if this should be in this forum or over in tuning. but here is my problem anyway.Trying to figure out what is causing the dip in power between 4500 and 5000 rpm.

2.0 first run with new turbo



2.1 added a degree of timing




2.2 removed a degree of timing vs 2.0





2.4 added 1 degree of timing before 4000 and used same timing as 2.0 above 4000(i think I got a little wheel slip)





any ideas what is causing it??

mods:
2006 WRX TR
PE1820
GMBCS
bosch 1000cc
walboro 255
E85 GAS
CSS TMIC
APS 3" turbo back
Open Source tune
the extreme need for an ewg??
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Old 07-18-2009, 02:14 AM   #3
wrxchitown
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I would like to go EWG soon, but the boost is staying pretty steady.
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Old 07-18-2009, 02:26 AM   #4
noonagon
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mega meth

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Quote:
Originally Posted by wrxchitown View Post
I would like to go EWG soon, but the boost is staying pretty steady.
had a problem like this on a forester, when he changed ewg springs from .7 bar to 1 bar. too a while to tune out, mostly boost issues not afr. grimmspeed bcs as well. just didn't seem to act as fact as others (prodrive) just looks like your bcs catches, then releases and as soon as the boost is climbing back up it hits it hard again.
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Old 07-18-2009, 10:22 AM   #5
Bullwinkle1983
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Post a full log. Is your clutch slipping?
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Old 07-18-2009, 10:56 AM   #6
MattPersman
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does it do it on wastegate pressure without the BCS into play
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Old 07-18-2009, 12:42 PM   #7
wrxchitown
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I didn't do any dyno logs at lower boost levels so Im not sure. Im going to turn the boost down a little to see if maybee I am out of the eficiancy range of the turbo at tht RPM.
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Old 07-18-2009, 01:26 PM   #8
Phatron
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Post a log......boost, timing, afr, total timing, fbkc and flkc.

that will help a lot more than dyno sheets.

im almost positive that its gonna be a boost issue. the way the torque oscillates it looks like you're overboosting and the turbo dynamics are too high....IE removing too much WGDC which is why you get such a drastic drop in torque.

Also, the large variation in peak tq over the 4 runs also points to a boost control issue.
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Old 07-18-2009, 02:16 PM   #9
Equilibrium Tuning
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logs would definitely help. It looks like clutch slip, pulled timing, or a large boost oscillation. If not, have you tried tuning AVCS to smooth it out?

-- Ed
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Old 07-18-2009, 03:17 PM   #10
wrxchitown
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logs are all posted at osecuroms.org http://www.osecuroms.org/viewtopic.php?f=2&t=1797 along with maps. I think I may have a blown turbo. noticed some oil under car so I decided to check the oil return line. pulled TMIC and trail of oil spills everywhere. no traces of any oil at up pipe downpie or exhaust wheel. but all kinds at BOV, intake pipe and turbine wheel. Anyone know how to clean oil out of intercooler??
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Old 07-18-2009, 05:14 PM   #11
Nuke209
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also do a compression test while at it.
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Old 07-18-2009, 10:25 PM   #12
Travman1
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Yeah, check compression test a friend of mine had a similar problem with his car and compression test unveiled a few small problems.
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