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

Massive power/tq drop on Dyno, possible cause?

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Old Apr 2, 2016 | 11:53 AM
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What pic?
 
Old Apr 2, 2016 | 11:56 AM
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File was to large had to compress added it and the previous post.
 
Old Apr 2, 2016 | 12:21 PM
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I dont see any issues with that.
 
Old Apr 2, 2016 | 12:26 PM
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I am a bit worried the turbo's are not actually k24/18G is there anyway to tell?
 
Old Apr 2, 2016 | 12:33 PM
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Originally Posted by nlcxmoses
New Porsche owner had my car dynoed yesterday and saw a huge drop in power after 4200RPM. What could cause a massive drop in power after 4200RPM, could boost leak or improper gaping cause this to occur?
I'm in bellevue too. Where did you get your car dynoed? carbconn? AMD?

You should get a durametric, and take it out to be datalogged. If you ever need some hands on help, I'm in the area.

Your turbos do look like an 18g, but an older wheel, not the modern billet version. The wastegate actuator always looks corroded as hell when its old. Its hard to tell if its functioning correctly from its outer appearance.
 

Last edited by TabooPc; Apr 2, 2016 at 12:46 PM.
Old Apr 2, 2016 | 12:51 PM
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Those dont look like 18gs. Go look and read the bkue label it would say k16 or k24.
 
Old Apr 2, 2016 | 12:58 PM
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Originally Posted by TabooPc
I'm in bellevue too. Where did you get your car dynoed? carbconn? AMD?

You should get a durametric, and take it out to be datalogged. If you ever need some hands on help, I'm in the area.

Your turbos do look like an 18g, but an older wheel, not the modern billet version. The wastegate actuator always looks corroded as hell when its old. Its hard to tell if its functioning correctly from its outer appearance.

I dynoed the car at ozzy_motors for one of the dyno days the hosted a couple of weeks ago. I plan to do some work on my car at my buddies house today as he has more tools and a air compressor, which i will need.

I got the car inspected before purchase but just a bit worried about the actual mods.
 
Old Apr 2, 2016 | 02:21 PM
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Sent you a DM Taboo with the address if you want to come and help.
 
Old Apr 2, 2016 | 03:24 PM
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Pulled out the n75 valve looked like a hose was not on checking to make sure it is still functioning.
 
Old Apr 2, 2016 | 03:28 PM
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Those hoses get briddle also make sure you tie wrap them and clean your maf sensor. I clean mine every month. Any dirt on them throws them off.
 
Old Apr 2, 2016 | 03:32 PM
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I currently have a BMC filter in will clean the maf again here shortly and reinstall I just have it spray it down correct?
 
Old Apr 2, 2016 | 04:52 PM
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Spray it with MAF cleaner, no other solvents. Is that filter oiled? If so consider swapping it, honestly as big as the stock paper filters are they're fine.
 
Old Apr 2, 2016 | 05:02 PM
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Originally Posted by BLKMGK
Spray it with MAF cleaner, no other solvents. Is that filter oiled? If so consider swapping it, honestly as big as the stock paper filters are they're fine.
+1 good info.
 
Old Apr 2, 2016 | 05:51 PM
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Yes it is oiled and i did use maf cleaner found a lose hose that connects to n75 valve while taking off the y pipe. Would the maf cause the timing to advance as much as it is and would it cause the car to run rich??? Checked the N75 Valve, dont know where to look next will fix the leak near the plenum next hopefully this fixes the issue with timing and the car running rich.
 
Old Apr 2, 2016 | 05:54 PM
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Yes the maf is very sensitive.
 


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