6SpeedOnline - Porsche Forum and Luxury Car Resource

996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Put bigger turbos on...car makes less power

Thread Tools
 
Rate Thread
 
Old Jul 5, 2012 | 07:48 PM
Share
  #1  
bad107's Avatar
Thread Starter
|
Registered User
Joined: Nov 2009
Posts: 1,364
From: houston, TX
Rep Power: 96
bad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond repute
Put bigger turbos on...car makes less power
I recently made a few changes to my car including a new OEM fuel pump, 5" intercoolers and a new EBC. I also swapped my alpha 28 turbos for alpha 3076s. The car is making 20% less power on the dyno and my load is down by ~20%. The logs look good, the boost is stable and the AFRs are spot on.

Anyone have any ideas what could be causing this?

Thanks!
 
Reply
Old Jul 5, 2012 | 08:05 PM
Share
  #2  
MBailey's Avatar
Registered User
Joined: Jul 2003
Posts: 2,957
From: Texas
Rep Power: 456
MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !MBailey Is a GOD !
My guess would be a bum tune. Look at the logs and see how high the timing goes at WOT... Also could be a boost leak.
 
Reply
Old Jul 5, 2012 | 08:18 PM
Share
  #3  
bad107's Avatar
Thread Starter
|
Registered User
Joined: Nov 2009
Posts: 1,364
From: houston, TX
Rep Power: 96
bad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond repute
Tuner said logs look good. We thought intake piping was keeping power down so this is on a mafless tune with filters on the turbo for the dyno.
 
Reply
Old Jul 5, 2012 | 08:45 PM
Share
  #4  
Tim941NYC's Avatar
Registered User
Joined: Jul 2010
Posts: 3,319
From: Long island NY
Rep Power: 381
Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !
what is your boost psi now and before with the 28's
 
Reply
Old Jul 5, 2012 | 09:02 PM
Share
  #5  
bad107's Avatar
Thread Starter
|
Registered User
Joined: Nov 2009
Posts: 1,364
From: houston, TX
Rep Power: 96
bad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond repute
i am just doing 1 and 1.3 bar pulls
 
Reply
Old Jul 5, 2012 | 09:17 PM
Share
  #6  
dynamic gt2's Avatar
Registered User
Joined: Mar 2009
Posts: 726
From: beirut lebanon
Rep Power: 54
dynamic gt2 is a splendid one to beholddynamic gt2 is a splendid one to beholddynamic gt2 is a splendid one to beholddynamic gt2 is a splendid one to beholddynamic gt2 is a splendid one to beholddynamic gt2 is a splendid one to beholddynamic gt2 is a splendid one to behold
Originally Posted by bad107
Tuner said logs look good. We thought intake piping was keeping power down so this is on a mafless tune with filters on the turbo for the dyno.
Do you have a fault code(air mass)in the DME memory since you are running mafless tune?
 
Last edited by dynamic gt2; Jul 5, 2012 at 09:27 PM.
Reply
Old Jul 6, 2012 | 12:57 AM
Share
  #7  
m3ntal's Avatar
Senior Member
Joined: Aug 2010
Posts: 303
From: nj
Rep Power: 73
m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !m3ntal Is a GOD !
Was the car retuned after all these new mods?
 
Reply

Trending Topics

Old Jul 6, 2012 | 02:25 AM
Share
  #8  
ek9max's Avatar
Registered User
Joined: Aug 2009
Posts: 315
From: calgary
Rep Power: 40
ek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud ofek9max has much to be proud of
Gotta be something wrong. Keep looking. I'm sure you'll figure it out and make lots of power.

Good luck!
 
Reply
Old Jul 6, 2012 | 06:15 AM
Share
  #9  
Tim941NYC's Avatar
Registered User
Joined: Jul 2010
Posts: 3,319
From: Long island NY
Rep Power: 381
Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !Tim941NYC Is a GOD !
Originally Posted by bad107
i am just doing 1 and 1.3 bar pulls
Are you overlaying 1bar and 1.3bar dyno sheets?
 
Reply
Old Jul 6, 2012 | 09:43 AM
Share
  #10  
bad107's Avatar
Thread Starter
|
Registered User
Joined: Nov 2009
Posts: 1,364
From: houston, TX
Rep Power: 96
bad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond repute
tim, those charts are sent you have the before and after mafless overlayed

neil, i have a bosch 044 booster pump and the afrs look good
 
Reply
Old Jul 6, 2012 | 10:46 AM
Share
  #11  
XLR82XS's Avatar
Registered User
20 Year Member
Joined: Jan 2004
Posts: 5,707
From: SW FL
Rep Power: 390
XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !XLR82XS Is a GOD !
Originally Posted by MBailey
My guess would be a bum tune. Look at the logs and see how high the timing goes at WOT... Also could be a boost leak.
That's my thought - boost leak.
 
Reply
Old Jul 6, 2012 | 01:11 PM
Share
  #12  
bad107's Avatar
Thread Starter
|
Registered User
Joined: Nov 2009
Posts: 1,364
From: houston, TX
Rep Power: 96
bad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond repute
The boost is coming on and holding stable though...

Here is a dyno and log
 
Attached Images  
Attached Files
File Type: pdf
maflesswgpressfirstrun1 (1).pdf (13.2 KB, 100 views)
Reply
Old Jul 6, 2012 | 01:16 PM
Share
  #13  
MannschaftQ8's Avatar
Banned
Joined: Feb 2012
Posts: 536
From: Kuwait
Rep Power: 38
MannschaftQ8 is a jewel in the roughMannschaftQ8 is a jewel in the roughMannschaftQ8 is a jewel in the rough
Could it be the Dyno itself
 
Reply
Old Jul 6, 2012 | 01:17 PM
Share
  #14  
bad107's Avatar
Thread Starter
|
Registered User
Joined: Nov 2009
Posts: 1,364
From: houston, TX
Rep Power: 96
bad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond reputebad107 has a reputation beyond repute
here is a log from before I swapped my turbos, intercoolers, fuel pump and headers and not on the mafless tune
 
Attached Files
File Type: pdf
log 1.2 1.3 alpha 28.pdf (291.2 KB, 152 views)
Reply
Old Jul 6, 2012 | 01:53 PM
Share
  #15  
Mark @ AIM Performance's Avatar
Basic Sponsor
15 Year Member
Joined: Dec 2009
Posts: 6,584
From: S.Plainfield, NJ
Rep Power: 856
Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !Mark @ AIM Performance Is a GOD !
boost looks like its coming on super slow which could be a by product of a boost controller. your peak tq is 530 at 4300rpm, when i ran those on pump/meth at 1.5bar i was getting 530 at 4000rpm and 590tq peak having the gates crack at 13psi.

i would check the wastegates too and your boost control, maybe try running N75 for boost control.
 
__________________
#TeamAIM
997TT SilverSpool - 210.8 mph 1/2 Mile WR Apr 2019, 9.2 @ 168 mph 1/4 Mile Manual World Record , 3.15 60-130 mph , 2.72 100-150 mph , 1400whp E85
996TT SpoolBus - 204.6 mph 1/2 Mile 996TT WR Aug 2018, 9.5 @ 154 mph, 3.23 60-130 mph, 2.5 100-150 mph Manual Porsche World Record, 1400whp E85
997TT SlowBerry - 205.0 mph 1/2 Mile WR Nov 2018, 9.7 @ 170 mph 1/4 Mile , 3.2 60-130 mph , 2.4 100-150 mph , 1420whp E85
ESMOTOR | DO88 | TPC DSC | SYVECS | COBB | IPD | KLINE | XONA | AMS | ID | ERP | SACHS | TURBOSMART | CSF | DODSON |
Reply


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search

All times are GMT -6. The time now is 12:43 AM.