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Put bigger turbos on...car makes less power

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Old 07-05-2012, 07:48 PM
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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!
 
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Old 07-05-2012, 08:05 PM
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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.
 
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Old 07-05-2012, 08:18 PM
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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.
 
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Old 07-05-2012, 08:45 PM
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what is your boost psi now and before with the 28's
 
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Old 07-05-2012, 09:02 PM
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i am just doing 1 and 1.3 bar pulls
 
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Old 07-05-2012, 09:17 PM
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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; 07-05-2012 at 09:27 PM.
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Old 07-06-2012, 12:57 AM
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Was the car retuned after all these new mods?
 
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Old 07-06-2012, 02:25 AM
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Gotta be something wrong. Keep looking. I'm sure you'll figure it out and make lots of power.

Good luck!
 
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Old 07-06-2012, 06:15 AM
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Originally Posted by bad107
i am just doing 1 and 1.3 bar pulls
Are you overlaying 1bar and 1.3bar dyno sheets?
 
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Old 07-06-2012, 09:43 AM
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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
 
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Old 07-06-2012, 10:46 AM
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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.
 
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Old 07-06-2012, 01:11 PM
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The boost is coming on and holding stable though...

Here is a dyno and log
 
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Old 07-06-2012, 01:16 PM
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Could it be the Dyno itself
 
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Old 07-06-2012, 01:17 PM
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here is a log from before I swapped my turbos, intercoolers, fuel pump and headers and not on the mafless tune
 
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Old 07-06-2012, 01:53 PM
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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.
 
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